Heat Advisory

NWS St Louis MO · US

Updated

Details

Heat Advisory Remains In Effect Until 8 PM CDT This Evening

Event: Heat Advisory
Issued: 2026-09-18 19:00:00 UTC
Onset: 2026-09-18 19:00:00 UTC
Message expires: 2026-09-19 01:00:00 UTC
Expected end: 2026-09-19 01:00:00 UTC
Category: Meteorological
Urgency: Expected
Severity: Moderate
Certainty: Likely
Response: Execute

Description

What

Heat index values up to 105.

Where

In Illinois, Fayette IL, Montgomery IL, Calhoun IL, Greene IL, Jersey IL, and Macoupin IL Counties. In Missouri, Boone MO, Callaway MO, Lincoln MO, and Montgomery MO Counties.

When

Until 8 PM CDT this evening.

Impacts

Hot temperatures and high humidity may cause heat illnesses.

Instructions

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

Affected areas

Greene County, IL
Macoupin County, IL
Montgomery
Fayette County, IL
Calhoun County, IL
Jersey County, IL
Boone County, MO
Callaway County, MO
Montgomery
Lincoln County, MO

Public contact

Issuer: NWS St Louis MO
Website: http://www.weather.gov

Message record

Received: 2026-09-18 19:00:27 UTC
Issue to receipt: ~27s
CAP status: Actual
CAP message type: Update
Lifecycle: Updated
Source: NWWS-OI
Feed: NWWS
Recovered: No

CAP routing and identity

ULID: 01M2TY8DFRY1JZRBD65JX9RK26
Identifier: urn:oid:2.49.0.1.840.0.6a14db25b9252b3576a3f1faedb67b5d6c28c5c5.001.1
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.1794
WMO heading: XOUS53
WMO data type: CAP alert message XML (XO)
WMO geography: United States (US)
WMO bulletin number: 53

References

Identifier: urn:oid:2.49.0.1.840.0.0c689efab567ec2df619893289d76dc1c8146e0a.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-18 07:58:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.02723a0bc382da4b03865a3982466e2de580af2b.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-17 21:44:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.5647f1ca48e3d56caf082ad16a36eb2d821020a0.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-17 07:19:00 UTC

Identifier: urn:oid:2.49.0.1.840.0.83c3c15b48faa08053db6943dad6c1ba75f79bc1.001.1
Sender: w-nws.webmaster@noaa.gov
Sent: 2026-09-16 16:29:00 UTC

Event codes

Name	Value
SAME	NWS
NationalWeatherService	HTY

Parameters

Name	Value
AWIPSidentifier	NPWLSX
WMOidentifier	WWUS73 KLSX 181900
NWSheadline	HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING
BLOCKCHANNEL	EAS
BLOCKCHANNEL	NWEM
VTEC	/O.CON.KLSX.HT.Y.0012.000000T0000Z-260919T0100Z/
eventEndingTime	2026-09-18T20:00:00-05:00
BLOCKCHANNEL	CMAS
expiredReferences	w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.02723a0bc382da4b03865a3982466e2de580af2b.001.1,2026-09-17T16:44:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.5647f1ca48e3d56caf082ad16a36eb2d821020a0.001.1,2026-09-17T02:19:00-05:00 w-nws.webmaster@noaa.gov,urn:oid:2.49.0.1.840.0.83c3c15b48faa08053db6943dad6c1ba75f79bc1.001.1,2026-09-16T11:29:00-05:00

Locations

Location data

Greene County, IL
Macoupin County, IL
Montgomery
Fayette County, IL
Calhoun County, IL
Jersey County, IL
Boone County, MO
Callaway County, MO
Montgomery
Lincoln County, MO

Name	Value
SAME	017061
SAME	017117
SAME	017135
SAME	017051
SAME	017013
SAME	017083
SAME	029019
SAME	029027
SAME	029139
SAME	029113
UGC	ILZ058
UGC	ILZ059
UGC	ILZ060
UGC	ILZ065
UGC	ILZ098
UGC	ILZ099
UGC	MOZ041
UGC	MOZ050
UGC	MOZ051
UGC	MOZ052