Download Aviation Weather Center SIGMETs

Download archived AWC SIGMET polygons as shapefile, KML, CSV, or Excel based on issuance time in UTC.

Related Links

CWSU Center Weather AdvisoriesAWC G-AIRMETsPIREPsTAFsTemp/Winds Aloft

Backend documentation for those wishing to script against this download portal.

Time Interval for SIGMET Issuance TIme (UTC)
	Year	Month	Day	Hour	Minute
Start:	2005200620072008200920102011201220132014201520162017201820192020202120222023202420252026	JanFebMarAprMayJunJulAugSepOctNovDec	12345678910111213141516171819202122232425262728293031	0 UTC1 UTC2 UTC3 UTC4 UTC5 UTC6 UTC7 UTC8 UTC9 UTC10 UTC11 UTC12 UTC13 UTC14 UTC15 UTC16 UTC17 UTC18 UTC19 UTC20 UTC21 UTC22 UTC23 UTC	01234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859
End:	2005200620072008200920102011201220132014201520162017201820192020202120222023202420252026	JanFebMarAprMayJunJulAugSepOctNovDec	12345678910111213141516171819202122232425262728293031	0 UTC1 UTC2 UTC3 UTC4 UTC5 UTC6 UTC7 UTC8 UTC9 UTC10 UTC11 UTC12 UTC13 UTC14 UTC15 UTC16 UTC17 UTC18 UTC19 UTC20 UTC21 UTC22 UTC23 UTC	01234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859

Format:
Shapefile KML CSV Excel

Shapefile DBF schema:

Field 0: Type=C/String, Title='NAME' Combination of label and type fields
Field 1: Type=C/String, Title='LABEL' SIGMET label
Field 2: Type=C/String, Title='TYPE', One Character SIGMET type, always `C` at
         this time.
Field 3: Type=C/String, Title='ISSUE', Issuance UTC Time
Field 4: Type=C/String, Title='EXPIRE', Expiration UTC Time
Field 5: Type=C/String, Title='PROD_ID', IEM NWS Text Product Identifier, which
	 can be used against the /api/1/nwstext/<PROD_ID> service.
Field 6: Type=C/String, Title='TEXT', The SIGMET raw text

Archive / Usage Notes:

1. 14 May 2025: A number of location processing fixes were implemented with archive corrections made. Tthe archive was backfilled to the start of 2005 as well.