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Aircraft Weather Advisories

  1. Advisories Element
  2. SIGMET Advisory
    1. VALID Element
    2. AFFECTING Element
    3. EXTENT Element
    4. HAZARD Element
    5. REMARKS Element
    6. CANCEL Element
    7. NONE Element
    8. OUTLOOK
  3. AIRMET advisory
  4. Area Forecast regions
  5. OMF Example
  6. References

  

Advisories Element

This element defines a collection of weather hazard advisories. The collection is made of SIGMET, AIRMET, or WW elements of various kinds, advising of weather potentially hazardous to all aircraft.

 
  XML DTD
  
<!ELEMENT Advisories ( SIGMET | AIRMET | OUTLOOK | WW )*>

Attributes

TStamp
  Time Stamp when this group of advisories was created. Normally it is the time the request is fulfilled.  
 

  
<!ATTLIST Advisories
	%TStamp;
>

  

SIGMET Advisory

According to National Weather Service's Operations Manual [WSOM-D25]

Significant Meteorological Advisories (SIGMET) are in-flight advisories that warn of internationally specified weather phenomena of an intensity and/or extent that concerns pilots and operators of all aircraft. In the conterminous United States, SIGMETs have been separated into two types, convective (i.e., thunderstorm-related) and nonconvective.

This element describes one particular SIGMET advisory, either convective or non-convective. This element can also inform of a cancellation of a previously issued (non-convective) SIGMET. Finally, the element may positively indicate that an aviation support center did not issue an advisory within the current period because of the absence of weather phenomena of concern. The contents of a SIGMET element includes all the text from the advisory as it was issued: WST headers, a formal description of the weather hazard, and remarks. The text strings are annotated to indicate their syntactic function and to communicate their meaning in a more uniform and machine-friendly way. For example, time stamps are always presented in absolute EPOCH seconds, the type and the dimensions of the hazard are extracted, airport references are converted into points on the globe specified as lat lon pairs. It is always possible to transform a SIGMET element back to the original advisory as it was issued by an aviation weather center.

 
  XML DTD
  
<!ELEMENT SIGMET ((VALID, AFFECTING?, EXTENT, HAZARD, REMARKS?) | CANCEL | NONE)>

Attributes

class
  Class (series) of a SIGMET advisory. For a non-convective SIGMET, this the alphabetic series designator CONVECTIVE|N|O|P|Q|R|U|V|W|X|Y
(CONVECTIVE|N|O|P|Q|R|U|V|W|X|Y)
 
id
  ID for a particular advisory NMTOKEN
NMTOKEN
 
For a Convective SIGMET, the id has the format nnt where t is a letter "E", "C", or "W" (for the Eastern, Central and Western Convective SIGMET correspondingly), and nn is the issuance number.
For a non-convective SIGMET, id has the format nnrrr, where nn is the issuance number and rrr is a 3-letter FAA area designator: SFO, SLC, CHI, DFW, BOS, or MIA
 
TStamp
  Time Stamp when this advisory was issued  
 
BBox
  Boundary box for an affected area.  
 
This attribute may be omitted as extent of a weather hazard is more precisely specified by a EXTENT minor element.
 
Urgent
  Urgency indicator Urgent or omitted
(Urgent)
 
This boolean attribute is set when the corresponding non-convective SIGMET is assigned a UWS (urgent SIGMET) FAA product-type identifier. Normally the first issuance of a non-convective SIGMET in a series is marked urgent.
 

  
<!ATTLIST SIGMET
	class (CONVECTIVE|N|O|P|Q|R|U|V|W|X|Y) #REQUIRED
	id NMTOKEN #REQUIRED
	%TStamp;
	%BBox-OPT;
	Urgent (Urgent) #IMPLIED
>

  

VALID Element

The VALID element specifies the expiration time for the advisory. This markup annotates the corresponding line of a raw report.

It is a basic minor VALID element described in the introduction.


  

AFFECTING Element

A brief description of the affected states or areas, using two-letter state, Great Lakes and state coastal water identifiers.

 
  XML DTD
  
<!ELEMENT AFFECTING (#PCDATA)>

  

EXTENT Element

The EXTENT element gives a precise specification of the area affected by a weather condition for which the present advisory was issued. The contents of the element is the location line of a raw report. The attributes normalize the coordinates in a lat lon format.

If an advisory or an outlook does not have a location line, the EXTENT element will still be present. The element will have the empty content. Its LatLons attribute will outline the whole Eastern, Central, or Western convective region or the appropriate Flight Advisory region.

 
  XML DTD
  
<!ELEMENT EXTENT (#PCDATA)>

Attributes

Shape
  Shape of an area AREA or LINE or POINT
(AREA | LINE | POINT)
 
LatLons
  Control points (vertices) for a polygon/polyline representing the affected area  
 

  
<!ATTLIST EXTENT
	Shape (AREA | LINE | POINT) #REQUIRED
	%LatLons;
>

  

HAZARD Element

The element annotates one, two or three sentences that formally describe the phenomenon posing a hazard, and its duration. This is a proper text of an advisory sans the remarks.

 
  XML DTD
  
<!ELEMENT HAZARD (#PCDATA)>

Attributes

Type
  type of the hazard code, see below
(TS | TURB | ICG | DUST | SAND | ASH | ERUPTION | SSWIND | LLWS | IFR | MTN | FRZLVL | UNKNOWN)
 
Domain expr:
  • TS  - Thunderstorm(s)
  • TURB - Turbulence including clear-air turbulence
  • ICG  - Icing
  • DUST  - Duststorm
  • SAND  - Sandstorm
  • ASH  - Volcanic ash
  • ERUPTION  - Volcanic eruption
  • SSWIND  - Strong surface winds
  • LLWS  - Low-level wind shear
  • IFR  - IFR ceilings or visibility
  • MTN  - MTN OBSCN Mountain/Mountain Ridges obscuration
  • FRZLVL  - Freezing levels
  • UNKNOWN  - The precise type of the hazard could not be identified (e.g., because of a spelling error in an advisory)
 
Dim
  Spatial dimensions of the hazard: the cell size for an isolated thunderstorm; the line width for a line of thunderstorms, etc. In meters. integer or omitted
NMTOKEN
 
Dir
  Direction vector a string of a form " nnn mm" or omitted
NMTOKENS
 
Here nnn is a true direction from which the hazard is moving, in degrees. This is an unsigned integer number within [0,360), with 0 meaning the hazard is moving from the true North. Normally this number has a precision of 10 degrees.
mm is the speed of movement in meters per second.
 
Tops-min
  The lower boundary of the vertical extent of the hazard an unsigned integer or FRZLVL or omitted
NMTOKEN
 
The number is the height of the lower boundary of the hazard, in MSL feet.
 
Tops-max
  The upper boundary of the vertical extent of the hazard an unsigned integer or FRZLVL or omitted
NMTOKEN
 
The number is the height of the upper boundary of the hazard, in MSL feet.
 

  
<!ATTLIST HAZARD
	Type (TS | TURB | ICG | DUST | SAND | ASH | ERUPTION | SSWIND | LLWS | IFR | MTN | FRZLVL | UNKNOWN) #REQUIRED
	Dim NMTOKEN #IMPLIED
	Dir NMTOKENS #IMPLIED
	Tops-min NMTOKEN #IMPLIED
	Tops-max NMTOKEN #IMPLIED
>

  

REMARKS Element

Remarks associated with the advisory, in plain text. This element may also contain parts of the advisory that cannot be parsed due to a coding or a transmission error.

 
  XML DTD
  
<!ELEMENT REMARKS (#PCDATA)>

  

CANCEL Element

Presence of this element indicates the cancellation of a previously issued non-convective SIGMET or an AIRMET. The advisory to cancel is identified by the class and id attributes of the parent element. The body of the CANCEL element is the text of the cancellation message, which explains the reason the advisory is canceled.

 
  XML DTD
  
<!ELEMENT CANCEL (#PCDATA)>

  

NONE Element

This element indicates that an aviation support center has determined that within its administrative area there are no weather phenomena of intensity or extent that require the issuance of a (convective) SIGMET advisory. The aviation support center and the current period are identified by the attributes of the parent element. The optional body of the NONE element details, in plain text, the reasons the advisory is not issued.

The element NONE may also indicate an irrecoverable error in the formatting of the advisory -- an error that precludes any machine interpretation of the advisory. In this case, the body of the element contains the entire text of the ill-formed advisory.

 
  XML DTD
  
<!ELEMENT NONE (#PCDATA)>

  

OUTLOOK

The convective SIGMET outlook is a forecast of thunderstorm conditions that is appended to every WST (SIGMET) advisory, even the empty one. The forecast is valid for the period two to six hours after the issuance time of the WST bulletin to which it is appended. The forecast includes a discussion of the meteorological factors involved in the development of the hazard that has triggered or will trigger a SIGMET

In an AIRMET bulletin, outlook is optional. If present, it describes in more detail weather conditions as they are expected to continue, develop, move or end during the 6-hour outlook period, which starts after the first 6 hours valid time of the AIRMET.

 
  XML DTD
  
<!ELEMENT OUTLOOK (VALID, AFFECTING?, EXTENT, REMARKS)>

Attributes

class
  Class (series) of an outlook. CONVECTIVE|IFR|MTN|TURB
(CONVECTIVE|IFR|MTN|TURB|ICG)
 
id
  ID for a particular outlook discussion NMTOKEN
NMTOKEN
 
It has the form nnt, where nn is the area number for the outlook. If outlook message has only one area, nn is 1. For a convective outlook, t is a letter "E", "C", or "W" (for the Eastern, Central and Western Convective SIGMET correspondingly).
 
TStamp
  Time Stamp when this outlook was issued  
 
BBox
  Boundary box for an affected area.  
 
This attribute may be omitted as extent of a weather hazard is more precisely specified by a EXTENT minor element.
 

  
<!ATTLIST OUTLOOK
	class (CONVECTIVE|IFR|MTN|TURB|ICG) #REQUIRED
	id NMTOKEN #REQUIRED
	%TStamp;
	%BBox-OPT;
>

  

AIRMET advisory

Airmets are also advisories of significant weather phenomena but describe conditions at intensities lower than those which triggered sigmets. Both are intended for dissemination to all pilots in the en route phase of flight to enhance safety.[WSOM-D22]

An AIRMET advisory issued by a service center is a collection of advisories on conditions of moderate or light intensity, outlook discussions, references to SIGMETs, and just remarks. All items in a collection are united by a common theme -- IFR, turbulence, or icing. The theme of an advisory is reflected in its alphabetic designator (SIERRA, TANGO or ZULU) and is also spelled out in plain text in the AIRMET header, e.g., AIRMET SIERRA FOR IFR AND MT OBSC.

Since a separate advisory in an AIRMET collection describes a separate hazard affecting a separate area, we associate a separate AIRMET element with each item in an advisory collection. An outlook discussion is described by the OUTLOOK element. A set of AIRMET elements related to a single collective issued by a service center has the same id, class, and the issue timestamp. Therefore, it is always possible to reconstruct the original collective from a sequence of AIRMET and OUTLOOK elements. An AIRMET collective has redundant data, for example, the collective's theme in the header, e.g., FOR IFR AND MT OBSC. The plain-text description of collective's theme can be deduced from the type of the hazards that are described in the collective. Therefore, we omit such redundant data from the markup, without any loss of information. Splitting an AIRMET collective into separate advisories, discussions and remarks makes it possible to query for only those advisories that bear upon a small isolated region or a geolocation.

An AIRMET element corresponds to one particular itemof an advisory collection. The element annotates sentences from an advisory that describe a weather condition, its location, affected areas, and any changes expected during the AIRMET valid period. The text strings are annotated to indicate their syntactic function and to communicate their meaning in a more uniform and machine-friendly way. For example, time stamps are always presented in absolute EPOCH seconds, the type and the dimensions of the hazard are extracted, airport references are converted into points on the globe specified as lat lon pairs.

 
  XML DTD
  
<!ELEMENT AIRMET (VALID, AFFECTING?, EXTENT, ((HAZARD?, REMARKS?) | CANCEL))>

Attributes

class
  Class (series) of a AIRMET advisory: the alphabetic phenomenon designation of an AIRMET bulletin S|T|Z
(S|T|Z)
 
Domain expr:
  • S  - significant IFR or mountain obscuration
  • T  - turbulence, strong surface winds or LLWS
  • Z  - icing and freezing level
 
id
  ID for a particular advisory NMTOKEN
NMTOKEN
 
The id has the format nnrrr, where nn is the update number (0 for the primary bulletin, 1 for the first update, etc), and rrr is a 3-letter FAA area designator: SFO, SLC, CHI, DFW, BOS, or MIA
 
TStamp
  Time Stamp when this advisory was issued  
 
BBox
  Boundary box for an affected area.  
 
This attribute may be omitted as extent of a weather hazard is more precisely specified by a EXTENT minor element.
 
updated
  A binary indicator for an updated report updated or omitted
(updated)
 
severity
  Severity indicator MODERATE|LIGHT|REM
(MODERATE|LIGHT|REM)
 
An AIRMET bulletin normally consists of advisories of moderate severity, and remarks. In addition a bulletin may include reports on turbulence or icing conditions not meeting AIRMET criteria (light intensity or local area) but which are still, in forecaster's judgment, are significant to some flight operations. Such reports are marked as having LIGHT severity.
 

  
<!ATTLIST AIRMET
	class (S|T|Z) #REQUIRED
	id NMTOKEN #REQUIRED
	%TStamp;
	%BBox-OPT;
	updated (updated) #IMPLIED
	severity (MODERATE|LIGHT|REM) 'MODERATE'
>

  

Area Forecast regions

According to WSOM D-20, six Area Forecasts (FAs) are issued by the National Aviation Weather Advisory Unit for conterminous United States and adjacent coastal waters. Four additional FAs are issued by the National Weather Service Forecast Offices in Anchorage, Fairbanks, Juneau and Honolulu. The areas are delineated along the state boundaries. Given below are the areas and LatLons list of vertices of their bounding polygons.

Pacific Coast FA/WA area (SFO): states WA, OR, CA and coastal waters.


  XML DTD
  
<!ENTITY FA-AREA-SFO "
48.967 -117.017 46.433 -116.95 46. -116.85 45.667 -116.35 44.417 -117.167 44.133 -116.867 43.867 -116.933 41.983 -116.967 42.017 -119.967 38.917 -119.933 34.983 -114.583 34.85 -114.5 34.683 -114.367 34.567 -114.367 34.233 -114.05 34.017 -114.467 33.833 -114.417 33.55 -114.433 33.383 -114.667 33.017 -114.583 32.967 -114.467 32.717 -114.483 32.683 -114.767 32.533 -117.083 32.383 -117.033 30.667 -120.667 32.017 -121.6 32.95 -121.95 34.067 -123.117 39.967 -126.967 44.95 -126.417 45.883 -126.95 48.317 -127.867 48.467 -124.717 48.2 -123.617 48.283 -122.983 48.933 -123.367 48.967 -117.017">

Rocky mountain FA/WA area (SLC): states ID, MT, WY, NV, UT, CO, AZ and NM.


  XML DTD
  
<!ENTITY FA-AREA-SLC "
49.017 -103.983 41.010 -103.967 40.967 -102.017 36.983 -101.967 37.017 -102.983 31.967 -103.033 32.017 -106.683 31.767 -106.45 31.817 -108.15  31.267 -108.133 31.35  -111.067 32.433 -114.783 32.567 -114.833 32.65  -114.433 32.933 -114.4   32.967 -114.483 33.333 -114.617 33.467 -114.45  33.933 -114.45  34.183 -113.933 34.533 -114.267 34.983 -114.583 38.917 -119.933 42.017 -119.967 41.983 -116.967 43.867 -116.967 43.967 -116.833 44.167 -116.833 44.35  -117.167 45.533 -116.283 45.933 -116.767 46.067 -116.933 46.517 -116.933 48.967 -116.9   48.967 -115.983 49.017 -103.983">

North-Central FA/WA area (CHI): states ND, SD, NE, KS, MN, IA, MO, WI, IL, MI, IN, KY, and Lakes Superior, Michigan and Huron.


  XML DTD
  
<!ENTITY FA-AREA-CHI "
49.35 -95.167 49.35 -94.817 48.733 -94.633 48.617 -93.817 48.483 -93.783 48.517 -93.467 48.617 -93.217 48.517 -92.567 48.217 -92.383 48.2 -92.217 48.35 -92.167 48.217 -91.917 48.017 -91.4 48.233 -90.883 48.067 -90.733 48.083 -90.567 48.083 -90.133 47.983 -90.017 48. -89.833 47.967 -89.617 48.3 -88.367 46.883 -84.883 46.433 -84.633 46.483 -84.283 46.217 -84.067 46. -84.05 45.333 -82.45 43.533 -82.033 42.967 -82.35 42.383 -82.817 41.683 -83.467 41.7 -84.833 39.1 -84.717 39.083 -84.433 38.817 -84.2 38.567 -83.267 38.75 -82.967 38.367 -82.533 38.117 -82.633 37.65 -82.283 37.433 -82. 37.067 -82.767 36.7 -83.167 36.583 -83.6 36.633 -87.8 36.7 -88.017 36.433 -88.05 36.483 -89.483 36. -89.683 35.95 -90.383 36.3 -90.067 36.467 -90.183 36.5 -94.6 36.967 -94.583 36.983 -101.967 40.933 -102.017 41.017 -104.033 48.983 -104.017 48.967 -95.083 49.35 -95.167">

South-Central FA/WA area (DFW): states OK, TX, AR, TN, LA, MS, AL and coastal waters.


  XML DTD
  
<!ENTITY FA-AREA-DFW "
37. -103.05 36.967 -94.6 36.467 -94.633 36.467 -90.167 36.317 -90.05 35.917 -90.417 35.967 -89.733 36.467 -89.517 36.467 -88.067 36.667 -88.033 36.633 -87.817 36.583 -81.65 36.35 -81.65 36.15 -82.033 36. -82.467 35.883 -82.85 35.5 -83.467 35.533 -83.867 35.3 -84.05 35.25 -84.183 35.117 -84.267 34.933 -84.2 34.983 -85.583 32.817 -85.183 32.4 -84.933 32.267 -84.967 32.233 -84.85 32.1 -85.083 31.733 -85.083 31.517 -84.933 31.367 -85.067 31.2 -85.067 31.017 -84.95 31. -87.583 30.967 -87.6 30.633 -87.433 30.383 -87.333 27.45 -87.033 27.483 -87.683 28.133 -87.983 28.233 -89.183 28.267 -93.967 27.517 -95.183 25.967 -95.917 26.033 -97.267 25.817 -97.417 26.017 -97.617 26.217 -98.467 26.417 -99.1 26.817 -99.233 26.883 -99.383 27.533 -99.433 27.633 -99.667 28.033 -100.067 28.317 -100.283 28.917 -100.617 29.25 -100.833 29.85 -101.433 29.733 -102.083 29.867 -102.283 29.767 -102.383 29.767 -102.617 28.933 -103.117 29.167 -103.583 29.333 -104.05 29.45 -104.133 29.55 -104.383 29.867 -104.633 30.217 -104.667 30.383 -104.817 30.567 -104.85 30.917 -105.517 31.4 -106. 31.45 -106.183 31.75 -106.35 31.767 -106.567 31.95 -106.617 31.933 -103.033 37. -103.05">

Northeast FA/WA area (BOS): states ME, NH, VT, MA, RI, CT, NY, NJ, PA, OH, WV, MD, DC, DE, VA, Lakes Erie and Ontario and coastal waters.


  XML DTD
  
<!ENTITY FA-AREA-BOS "
47.433 -69.067 47.117 -69.083 47.383 -68.233 46.983 -67.767 45.7 -67.767 45.617 -67.45 45.233 -67.4 45.1 -67.133 45. -67. 39.067 -66.95 38.283 -70.017 37.45 -71.767 37.3 -72.617 36.383 -72.65 36.483 -75.867 36.583 -81.7 36.667 -83.283 37.167 -82.633 37.433 -82.017 38.033 -82.617 38.233 -82.517 38.783 -82.967 38.583 -83.217 38.617 -83.683 38.767 -84.183 39.083 -84.4 39.05 -84.683 41.7 -84.867 41.683 -83.433 41.983 -83.167 41.75 -82.933 41.683 -82.267 42.217 -81.15 42.617 -79.367 42.783 -78.917 43.417 -79.117 43.617 -78.617 43.583 -76.867 44.133 -76.383 44.967 -75. 44.95 -71.517 45.283 -71.283 45.317 -70.95 45.867 -70.283 46.383 -70.05 46.733 -69.917 47.4 -69.25 47.433 -69.067">

Southeast FA/WA area (MIA): states NC, SC, GA, FL and coastal waters.


  XML DTD
  
<!ENTITY FA-AREA-MIA "
36.567 -81.667 36.333 -72.633 35.067 -72.617 32.183 -77.017 26.933 -76.983 26.983 -78.933 26.517 -79.017 24.633 -78.983 23.983 -77.967 23.967 -83.05 27.483 -84.5 27.483 -87.083 30.417 -87.317 30.983 -87.583 30.983 -84.933 31.3 -85.033 31.55 -85. 31.783 -85.067 32.1 -85.067 32.2 -84.85 32.283 -84.95 32.4 -84.95 32.833 -85.15 34.967 -85.55 34.967 -84.217 35.1 -84.233 35.217 -84.183 35.233 -84.067 35.5 -83.817 35.467 -83.433 35.8 -82.883 36.1 -82.133 36.333 -81.667 36.533 -81.683 36.567 -81.667">

Fairbanks, AK FA/WA area (FAI)


  XML DTD
  
<!ENTITY FA-AREA-FAI "
71.233 -156.983 70.6 -153.217 69.733 -141.167 69.617 -141.133 61.4 -140.733 63.467 -146.7 62.917 -152.783 63.883 -152.117 61.65 -160.467 62.733 -161.567 62.85 -164.65 62.283 -165.867 62.317 -171.15 63.167 -172.45 63.617 -172.767 66.5 -164.267 66.083 -163.35 66.017 -161.867 66.75 -162.483 68.083 -165.75 68.533 -166.283 68.95 -166.217 69.083 -163.55 69.967 -163.167 71.233 -156.983">

Juneau, AK FA/WA area (JNU)


  XML DTD
  
<!ENTITY FA-AREA-JNU "
60.9 -143.867 60.2 -140.9 60.35 -139.25 58.917 -137.1 59.567 -136.15 59.8 -135.317 56.533 -131.55 56. -129.983 54.667 -130.067 54.367 -131.35 54.083 -135.117 57.967 -140.033 58.717 -143.933 60.9 -143.867">

Anchorage, AK FA/WA area (ANC)


  XML DTD
  
<!ENTITY FA-AREA-ANC "
63.767 -152.217 62.883 -152.7 63.467 -146.7 61.417 -140.817 60.183 -140.983 60.783 -143.833 58.617 -144.033 54.783 -143.65 56.567 -151.617 53.817 -158.883 52.917 -162.917 55.617 -165.9 56.917 -162.117 57.95 -164.317 60.133 -168.033 61.467 -168.067 62.183 -169.15 62.217 -169.967 62.183 -165.733 62.917 -164.35 62.633 -161.233 61.583 -160.233 63.767 -152.217">

Honolulu, HI MARINE AREA (HNL)


  XML DTD
  
<!ENTITY FA-AREA-HNL "
23.867 -159.033 23.35 -158.117 23.283 -157.35 22.817 -156.717 22.583 -155.817 21.767 -155.117 21.15 -154.017 20.017 -153.217 19.067 -153.1 18.2 -153.717 17.7 -154.483 17.317 -155.083 17.217 -155.883 17.533 -156.717 18.033 -157.233 18.483 -157.467 19.133 -157.617 19.633 -158.233 19.867 -158.883 20.217 -159.367 20. -160.317 20.1 -161.15 20.65 -161.883 21.517 -162.217 22.317 -162.083 23. -161.517 23.517 -160.817 23.833 -159.967 23.867 -159.033">

  

OMF Example

An original set of reports as given in a bulletin:
     CONVECTIVE SIGMET 53C
VALID UNTIL 0155Z
IL MO AR
FROM 40SW ORD-50W EVV-50SSW ARG-40N LIT-50SE BRL-40SW ORD
AREA SEV TS MOV FROM 26030KT. TOPS TO FL450.
TORNADO RPRTD 2326Z 21E STL.
TORNADO RPRTD 2322Z 47NE ARG. 
TORNADOES...HAIL TO 2 IN...WIND GUSTS TO 70 KT POSS.
^M^M
OUTLOOK VALID 120155-120555^M^M
TS ARE NOT EXPD.^M^M
^M^M
KLOTH^M^M
=^M^M

CONVECTIVE SIGMET 54C 
VALID UNTIL 0155Z
KY TN
FROM 20W LOZ-40NE MSL
DVLPG LINE TS 20 NM WIDE MOV FROM 27035KT. TOPS TO FL350.
^M^M
OUTLOOK VALID 120155-120555^M^M
FROM SSM-YVV-CLE-APE-IND-BDF-DBQ-BAE-SSM^M^M
TSTMS ARE EXP TO REINTNSFY WHILE MOVG SEWD THRU CNTRL GRTLKS^M^M
RGN. STNR FRONT EXTDSM FM NWRN IL THRU SRN IN. SHRTWV TROF MOVG^M^M
ACRS AREA WILL SUPPORT CNVTN THRUT PD.^M^M
^M^M
HUDSON^M^M
=^M^M

WSTW^M^M
MKCW WST 120155^M^M
CONVECTIVE SIGMET...NONE^M^M
 ^M^M
OUTLOOK VALID 120355-120755^M^M
TS ARE NOT EXPD TO REQUIRE WST ISSUANCES.^M^M
REFER TO MOST RECENT ACUS01 KWNS FROM STORM^M^M
PREDICTION CENTER FOR SYNOPSIS AND METEOROLOGICAL DETAILS.^M^M
^M^M
SLM^M^M=

DFWU WS 120155
SIGMET UNIFORM 1 VALID UNTIL 120555
LA MS AL GA FL AND CSTL WTRS
FROM 40SE DYR TO 30NE CHA TO 70WSW TLH TO 160S MOB TO 120SSW LCH
TO 60SW LCH TO 20W MEI TO 40SE DYR
AREA TS MOV FROM 25025KT. TOPS ABV FL450. CONDS MOVG ENE AND
CONTG BYD 0555Z.
AFWA
...=

CHIV UWS 120120
SIGMET VICTOR 1 VALID UNTIL 120520
MI IN KY LH OH PA WV LE
FROM 80E MBS TO DTW TO ERI TO JST TO BKW TO LOZ TO LOU TO IND
TO MKG TO 80E MBS
MOD OCNL SEV TURB BTWN FL260 AND FL420. CONDS CONTG BYD 0520Z.
AFWA

SLCW WS 120135
SIGMET WHISKEY 1 VALID UNTIL 120535
UT AZ NM
FROM 20WSW DVC TO 40W ABQ TO 30N DMN TO 50NNW SSO TO 40W PRC TO
40E BCE TO 20WSW DVC
AREA TS MOV LTL. TOPS TO FL300. CONDS CONTG BYD 0535Z.
AFWA
....=

BOSV WS 120100
CANCEL SIGMET VICTOR 3.  LTST PIREPS INDICATE THAT CONDS HAVE
DMSHD.  SEE THE BOS AIRMET TANGO SERIES FOR FURTHER INFORMATION
ON MOD UPR LVL TURB.
....=

ANCS WA 290145
AIRMET SIERRA FOR IFR AND MT OBSC VALID UNTIL 290800
.
AK PEN AI
MTS OCNL OBSC IN CLOUDS. NC.
.=

WA1T  
BOST WA 282053 AMD
AIRMET TANGO UPDT 4 FOR TURB VALID UNTIL 290200
.
...SEE SIGMET XRAY SERIES FOR SEV UPR LVL TURB AREA...UPDT
.
AIRMET TURB...NY PA OH LE
FROM YYZ TO JHW TO AIR TO FWA TO DXO TO YYZ
OCNL MOD TURB BLW 060. CONDS ENDG 02Z.
.
NO SGFNT TURB EXPCD OUTSIDE OF CNVTV ACT.
.
....

WA1Z  
BOSZ WA 290145
AIRMET ZULU FOR ICE AND FRZLVL VALID UNTIL 290800
.
AIRMET ICE...OH
FROM 50NNE FWA TO CLE TO 60W HNN TO CVG TO 50NNE FWA
OCNL LGT/MOD RIME ICGIC BTN 100 AND FL200. CONDS SPRDG EWD DURG
PD...CONTG BYD 08Z THRU 14Z.
.
FRZLVL...080-120 THRUT.
.
....

BOSS WA 290145
AIRMET SIERRA FOR IFR AND MTN OBSCN VALID UNTIL 290800
.
AIRMET IFR...ME NH VT NY LO
FROM 60NW PQI TO PQI TO YSJ TO CON TO BUF TO YYZ TO 60NW PQI
OCNL CIGS/VIS BLW OVC010/3SM IN CLDS..PCPN AND BR. CONDS CONTG
BYD 08Z...ENDG BY 14Z.
.
AIRMET MTN OBSCN...ME NH VT NY PA
FROM 60NW PQI TO PQI TO MLT TO CON TO HNK TO SLT TO JHW TO SYR
TO 60NW PQI
MTNS OCNLY OBSCD IN CLDS..PCPN AND BR. CONDS CONTG BYD 08Z THRU
14Z.
.
....

BOST WA 290745
AIRMET TANGO UPDT 1 FOR TURB VALID UNTIL 291400
.
AIRMET TURB...MA RI CT NY NJ PA OH LE WV MD DC DE VA AND CSTL
WTRS
FROM 160ENE BOS TO 200SE ACK TO 170E ORF TO HMV TO HNN TO CVG TO
FWA TO DXO TO SLT TO BOS TO 160ENE BOS
OCNL MOD TURB BTN FL240 AND FL400. CONDS CONTG BYD 14Z THRU 20Z.
.
AIRMET TURB...NY PA OH LE...UPDT
FROM YYZ TO JHW TO AIR TO FWA TO DXO TO YYZ
CNCL AIRMET. CONDS HAVE BCM LCL.
.
OTLK VALID 1400-2000Z...TURB ME NH VT MA RI CT NY NJ LO
AFT 14Z OCNL MOD TURB BLW 100 DVLPG OVER ME NH VT MA RI CT NY NJ
PA LO. CONDS CONTG THRU 20Z.
....

BOSS WA 291945
AIRMET SIERRA UPDT 5 FOR IFR AND MTN OBSCN VALID UNTIL 300200
.
NO SGFNT IFR EXP.
.
AIRMET MTN OBSCN...ME NH VT MA NY PA
FROM 70NNW PQI TO HUL TO CON TO HNK TO PSB TO JHW TO SYR TO MSS
TO YSC TO 70NNW PQI
MTNS OCNL OBSC IN CLDS AND PCPN. CONDS DVLPG NEWD ENDG SW OF SYR-
HNK LN BY 02Z ELSW CONTG BYD 02Z THRU 08Z.
....=

would be represented as
     <!DOCTYPE Advisories SYSTEM 'OMF.dtd'>
<Advisories TStamp='894934500'>
<SIGMET class='CONVECTIVE' id='53C' TStamp='894930900'>
<VALID TRange='894930900, 894938100'>VALID UNTIL 0155Z</VALID>
<AFFECTING>IL MO AR</AFFECTING>
<EXTENT Shape='AREA' LatLons='41.509 -88.534 38.030 -88.588 35.360 -91.325 35.397 -92.230 40.191 -90.352 41.509 -88.534'>40SW ORD-50W EVV-50SSW ARG-40N LIT-50SE BRL-40SW ORD</EXTENT>
<HAZARD Type='TS' Dir='260 15' Tops-max='45000'>
AREA SEV TS MOV FROM 26030KT. TOPS TO FL450.
</HAZARD>
<REMARKS>TORNADO RPRTD 2326Z 21E STL. TORNADO RPRTD 2322Z 47NE ARG. 
TORNADOES...HAIL TO 2 IN...WIND GUSTS TO 70 KT POSS.</REMARKS>
</SIGMET>

<OUTLOOK class='CONVECTIVE' id='1C' TStamp='894930900'>
<VALID TRange='894938100, 894952500'>VALID 120155-120555</VALID>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'></EXTENT>
<REMARKS>TS ARE NOT EXPD.

HUDSON</REMARKS>
</OUTLOOK>

<SIGMET class='CONVECTIVE' id='54C' TStamp='894930900'>
<VALID TRange='894930900, 894938100'>VALID UNTIL 0155Z</VALID>
<AFFECTING>KY TN</AFFECTING>
<EXTENT Shape='LINE' LatLons='37.080 -84.498 35.221 -87.046'> 20W LOZ-40NE MSL</EXTENT>
<HAZARD Type='TS' Dim='36000' Dir='270 17.5' Tops-max='35000'>
DVLPG LINE TS 20 NM WIDE MOV FROM 27035KT. TOPS TO FL350.</HAZARD>
</SIGMET>

<OUTLOOK class='CONVECTIVE' id='1C' TStamp='894930900'>
<VALID TRange='894938100, 894952500'>VALID 120155-120555</VALID>
<EXTENT Shape='AREA' LatLons='46.43 -84.32 44.68 -81.10 41.42 -81.85 40.10 -82.58 39.72 -86.28 41.23 -89.62 42.40 -90.72 42.95 -87.90 46.43 -84.32'>SSM-YVV-CLE-APE-IND-BDF-DBQ-BAE-SSM</EXTENT>
<REMARKS>TSTMS ARE EXP TO REINTNSFY WHILE MOVG SEWD THRU CNTRL GRTLKS
 RGN. STNR FRONT EXTDSM FM NWRN IL THRU SRN IN. SHRTWV TROF MOVG
 ACRS AREA WILL SUPPORT CNVTN THRUT PD.

HUDSON</REMARKS>
</OUTLOOK>

<SIGMET class='CONVECTIVE' id='0W' TStamp='894938100'>
<NONE/>
</SIGMET>

<OUTLOOK class='CONVECTIVE' id='1W' TStamp='894938100'>
<VALID TRange='894945300, 894959700'>VALID 120355-120755</VALID>
<EXTENT Shape='AREA' LatLons='60 -107 30 -107 30 -127 60 -127 60 -107'></EXTENT>
<REMARKS>TS ARE NOT EXPD TO REQUIRE WST ISSUANCES.
REFER TO MOST RECENT ACUS01 KWNS FROM STORM
PREDICTION CENTER FOR SYNOPSIS AND METEOROLOGICAL DETAILS.

SLM</REMARKS>
</OUTLOOK>

<SIGMET class='U' id='1DFW' TStamp='894938100'>
<VALID TRange='894938100, 894952500'>VALID UNTIL 120555</VALID>
<AFFECTING>LA MS AL GA FL AND CSTL WTRS</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>40SE DYR TO 30NE CHA TO 70WSW TLH TO 160S MOB TO 120SSW LCH
TO 60SW LCH TO 20W MEI TO 40SE DYR</EXTENT>
<HAZARD Type='TS' Dir='250 12.5' Tops-min='45000'>
AREA TS MOV FROM 25025KT. TOPS ABV FL450.</HAZARD>
<REMARKS>CONDS MOVG ENE AND CONTG BYD 0555Z.
AFWA</REMARKS>
</SIGMET>

<SIGMET class='V' id='1CHI' TStamp='894936000' Urgent='Urgent'>
<VALID TRange='894936000, 894950400'>VALID UNTIL 120520</VALID>
<AFFECTING>MI IN KY LH OH PA WV LE</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>80E MBS TO DTW TO ERI TO JST TO BKW TO LOZ TO LOU TO IND
TO MKG TO 80E MBS</EXTENT>
<HAZARD Type='TURB' Tops-min='26000' Tops-max='42000'>
MOD OCNL SEV TURB BTWN FL260 AND FL420. CONDS CONTG BYD 0520Z.</HAZARD>
<REMARKS>
AFWA</REMARKS>
</SIGMET>

<SIGMET class='W' id='1SLC' TStamp='894936900'>
<VALID TRange='894936900, 894951300'>VALID UNTIL 120535</VALID>
<AFFECTING>UT AZ NM</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>20WSW DVC TO 40W ABQ TO 30N DMN TO 50NNW SSO TO 40W PRC TO
40E BCE TO 20WSW DVC</EXTENT>
<HAZARD Type='TS' Tops-max='30000'>
AREA TS MOV LTL. TOPS TO FL300. CONDS CONTG BYD 0535Z.</HAZARD>
<REMARKS>
AFWA</REMARKS>
</SIGMET>

<SIGMET class='V' id='3BOS' TStamp='894934800'>
<CANCEL>LTST PIREPS INDICATE THAT CONDS HAVE
DMSHD.  SEE THE BOS AIRMET TANGO SERIES FOR FURTHER INFORMATION
ON MOD UPR LVL TURB.</CANCEL>
</SIGMET>

<AIRMET class='S' id='0ANC' TStamp='991125900' severity='LIGHT'>
<VALID TRange='991125900, 991148400'>VALID UNTIL 290800</VALID>
<AFFECTING>AK PEN AI</AFFECTING>
<EXTENT Shape='AREA' LatLons='&FA-AREA-ANC;'></EXTENT>
<HAZARD Type='MTN'>MTS OCNL OBSC IN CLOUDS. NC.</HAZARD>
</AIRMET>

<AIRMET class='T' id='4BOS' TStamp='991108380'
        severity='REM' updated='updated'>
<VALID TRange='991108380, 991126800'>VALID UNTIL 290200</VALID>
<EXTENT Shape='AREA' LatLons='&FA-AREA-BOS;'></EXTENT>
<REMARKS>...SEE SIGMET XRAY SERIES FOR SEV UPR LVL TURB AREA...UPDT
</REMARKS>
</AIRMET>

<AIRMET class='T' id='4BOS' TStamp='991108380' severity='REM'>
<VALID TRange='991108380, 991126800'>VALID UNTIL 290200</VALID>
<AFFECTING>NY PA OH LE</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>FROM YYZ TO JHW TO AIR TO FWA TO DXO TO YYZ</EXTENT>
<HAZARD Type='TURB'>OCNL MOD TURB BLW 060. CONDS ENDG 02Z.</HAZARD>
</AIRMET>

<AIRMET class='T' id='4BOS' TStamp='991108380' severity='REM'>
<VALID TRange='991108380, 991126800'>VALID UNTIL 290200</VALID>
<EXTENT Shape='AREA' LatLons='&FA-AREA-BOS;'></EXTENT>
<REMARKS>NO SGFNT TURB EXPCD OUTSIDE OF CNVTV ACT.
</REMARKS>
</AIRMET>

<AIRMET class='Z' id='0BOS' TStamp='991125900'>
<VALID TRange='991125900, 991148400'>VALID UNTIL 290800</VALID>
<AFFECTING>OH</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>50NNE FWA TO CLE TO 60W HNN TO CVG TO 50NNE FWA</EXTENT>
<HAZARD Type='ICG'>OCNL LGT/MOD RIME ICGIC BTN 100 AND FL200. CONDS SPRDG EWD DURG PD...CONTG BYD 08Z THRU 14Z.</HAZARD>
</AIRMET>

<AIRMET class='Z' id='0BOS' TStamp='991125900'>
<VALID TRange='991125900, 991148400'>VALID UNTIL 290800</VALID>
<EXTENT Shape='AREA' LatLons='&FA-AREA-BOS;'></EXTENT>
<HAZARD Type='FRZLVL'>FRZLVL...080-120 THRUT.</HAZARD>
</AIRMET>

<AIRMET class='S' id='0BOS' TStamp='991125900'>
<VALID TRange='991125900, 991148400'>VALID UNTIL 290800</VALID>
<AFFECTING>ME NH VT NY LO</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>60NW PQI TO PQI TO YSJ TO CON TO BUF TO YYZ TO 60NW PQI</EXTENT>
<HAZARD Type='IFR'>OCNL CIGS/VIS BLW OVC010/3SM IN CLDS..PCPN AND BR. CONDS CONTG BYD 08Z...ENDG BY 14Z.</HAZARD>
</AIRMET>

<AIRMET class='S' id='0BOS' TStamp='991125900'>
<VALID TRange='991125900, 991148400'>VALID UNTIL 290800</VALID>
<AFFECTING>ME NH VT NY PA</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>60NW PQI TO PQI TO MLT TO CON TO HNK TO SLT TO JHW TO SYR TO 60NW PQI</EXTENT>
<HAZARD Type='MTN'>MTNS OCNLY OBSCD IN CLDS..PCPN AND BR. CONDS CONTG BYD 08Z THRU 14Z.</HAZARD>
</AIRMET>

<AIRMET class='T' id='1BOS' TStamp='991147500'>
<VALID TRange='991147500, 991170000'>VALID UNTIL 291400</VALID>
<AFFECTING>MA RI CT NY NJ PA OH LE WV MD DC DE VA AND CSTL WTRS</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>160ENE BOS TO 200SE ACK TO 170E ORF TO HMV TO HNN TO CVG TO FWA TO DXO TO SLT TO BOS TO 160ENE BOS</EXTENT>
<HAZARD Type='TURB'>OCNL MOD TURB BTN FL240 AND FL400. CONDS CONTG BYD 14Z THRU 20Z.</HAZARD>
</AIRMET>

<AIRMET class='T' id='1BOS' TStamp='991147500' updated='updated'>
<VALID TRange='991147500, 991170000'>VALID UNTIL 291400</VALID>
<AFFECTING>NY PA OH LE...UPDT</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>YYZ TO JHW TO AIR TO FWA TO DXO TO YYZ</EXTENT>
<CANCEL>CNCL AIRMET. CONDS HAVE BCM LCL.</CANCEL>
</AIRMET>

<OUTLOOK class='TURB' id='1BOS' TStamp='991147500'>
<VALID TRange='991170000, 991191600'>VALID 1400-2000Z</VALID>
<AFFECTING>ME NH VT MA RI CT NY NJ LO</AFFECTING>
<EXTENT Shape='AREA' LatLons='&FA-AREA-BOS;'></EXTENT>
<REMARKS>AFT 14Z OCNL MOD TURB BLW 100 DVLPG OVER ME NH VT MA RI CT NY NJ
PA LO. CONDS CONTG THRU 20Z.</REMARKS>
</OUTLOOK>

<AIRMET class='S' id='5BOS' TStamp='991190700' severity='REM'>
<VALID TRange='991190700, 991213200'>VALID UNTIL 300200</VALID>
<EXTENT Shape='AREA' LatLons='&FA-AREA-BOS;'></EXTENT>
<REMARKS>NO SGFNT IFR EXP.</REMARKS>
</AIRMET>

<AIRMET class='S' id='5BOS' TStamp='991190700'>
<VALID TRange='991190700, 991213200'>VALID UNTIL 300200</VALID>
<AFFECTING>ME NH VT MA NY PA</AFFECTING>
<EXTENT Shape='AREA' LatLons='60 -87 30 -87 30 -107 60 -107 60 -87'>70NNW PQI TO HUL TO CON TO HNK TO PSB TO JHW TO SYR TO MSS TO YSC TO 70NNW PQI</EXTENT>
<HAZARD Type='MTN'>MTNS OCNL OBSC IN CLDS AND PCPN. CONDS DVLPG NEWD ENDG SW OF SYR-HNK LN BY 02Z ELSW CONTG BYD 02Z THRU 08Z.</HAZARD>
</AIRMET>
</Advisories>


  

References

[CONV-SIGMETS] What are Convective SIGMETs?
< http://www.awc-kc.noaa.gov/awc/help/what_are_convective_sigmets.html>

[WSOM-D22] National Weather Service. Operations Manual. Part D, Chapter 22. In-Flight Aviation Weather Advisories

[WSOM-D25] National Weather Service. Operations Manual. Part D, Chapter 25. Support to Air Traffic Facilities
< http://www.nws.noaa.gov/oso/oso1/oso12/wsom/wsomd25.html>

[NWS-Contractions] Frequently used contractions in National Weather Service products (including SIGMET and AIRMET reports)
< http://www.awc-kc.noaa.gov/info/domestic_contractions.html>

[NWS-AWC] National Weather Service Aviation Weather Center
< http://www.awc-kc.noaa.gov/index.html>

[RT-Aviation] Real-Time Weather Data: Aviation Page
< http://www.rap.ucar.edu/weather/aviation.html>

[OMF-DTD] The OMF Data Definition Document in XML format
< http://www.metnet.navy.mil/Metcast/XML/OMF.dtd>

[OMF-Adv-SAMPLE] Sample OMF Advisories document
< http://www.metnet.navy.mil/Metcast/XML/OMF-advisories.xml>

[Metcast-ADVISORIES] Current Aircraft advisories from the Metcast database, in the OMF format described in this document
< http://www.metnet.navy.mil/cgi-bin/oleg/get-advisories>


Last updated July 16, 2003

Converted from SXML by SXML->HTML

$Id: OMF-SIGMET.scm,v 3.5 2003/07/16 23:39:45 oleg Exp oleg $