Heat Advisory

NWS St Louis MO · US

Updated

This event was updated at 2026-09-20 00:58:00 UTC.

Details

Heat index values up to 105.

Portions of south central and southwest Illinois and central, east central, and southeast Missouri.

Until 8 PM CDT Saturday.

Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

CAP routing and identity

ULID: 01M2TY8DMRHE1MKH5095RX7KBX
Identifier: urn:oid:2.49.0.1.840.0.6a14db25b9252b3576a3f1faedb67b5d6c28c5c5.002.1
Sender: w-nws.webmaster@noaa.gov
Scope: Public
CAP source: 211803 v2.3.0
Handling codes: IPAWSv1.0
Issuing office: NWS St Louis MO
AWIPS ID: CAPLSX
NWWS sequence: nwws_processor.1795
WMO heading: XOUS53
WMO data type: CAP alert message XML (XO)
WMO geography: United States (US)
WMO bulletin number: 53

Identifier: urn:oid:2.49.0.1.840.0.0c689efab567ec2df619893289d76dc1c8146e0a.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-18 07:58:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.02723a0bc382da4b03865a3982466e2de580af2b.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-17 21:44:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.5647f1ca48e3d56caf082ad16a36eb2d821020a0.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-17 07:19:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.83c3c15b48faa08053db6943dad6c1ba75f79bc1.002.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-16 16:29:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.fcdde70e7d8ed65e156ae9fb4bad5a91e6e498c3.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-16 07:51:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.875cdbf9b5b58cfdbfe2e0a933cdff19d4d8d486.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-15 16:53:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.1382cb5a279f8b74020af5ffaa3c82f7467ab3b1.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-15 06:44:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.327474d7d69051ee18989fc7a661c16623bfeab0.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-14 16:30:00 UTC

Name	Value
SAME	NWS
NationalWeatherService	HTY

Name	Value
AWIPSidentifier	NPWLSX
WMOidentifier	WWUS73 KLSX 181900
NWSheadline	HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT SATURDAY
BLOCKCHANNEL	EAS
BLOCKCHANNEL	NWEM
VTEC	/O.CON.KLSX.HT.Y.0012.000000T0000Z-260920T0100Z/
eventEndingTime	2026-09-19T20:00:00-05:00
BLOCKCHANNEL	CMAS
expiredReferences	w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.02723a0bc382da4b03865a3982466e2de580af2b.002.1,2026-09-17T16:44:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.5647f1ca48e3d56caf082ad16a36eb2d821020a0.002.1,2026-09-17T02:19:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.83c3c15b48faa08053db6943dad6c1ba75f79bc1.002.1,2026-09-16T11:29:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.fcdde70e7d8ed65e156ae9fb4bad5a91e6e498c3.001.1,2026-09-16T02:51:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.875cdbf9b5b58cfdbfe2e0a933cdff19d4d8d486.001.1,2026-09-15T11:53:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.1382cb5a279f8b74020af5ffaa3c82f7467ab3b1.001.1,2026-09-15T01:44:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.327474d7d69051ee18989fc7a661c16623bfeab0.001.1,2026-09-14T11:30:00-05:00

Locations