Alert archive / Missouri / Excessive Heat Warnings in 2021
Excessive Heat Warning 1, NWS St. Louis, MO
NWS St. Louis, MO issued this excessive heat warning at Aug 10, 2021, 3:20 AM CDT for Madison County, Saint Clair County, Illinois; Saint Charles County, Saint Louis County, City of Saint Louis, Missouri. It took effect at Aug 10, 2021, 12:00 PM CDT. It was in force for 56 hr. 39 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 10, 2021, 3:20 AM CDT (08:20 UTC)
- In effect from
- Aug 10, 2021, 12:00 PM CDT
- Expired
- Aug 12, 2021, 8:00 PM CDT
- In force
- 56 hr
- Issued by
- NWS St. Louis, MO
Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 08:23 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 10, 12:55 PM CDT | TSTM WND DMG | 2 Nne Maryland Heights, MO | 4 TO 8 INCH TREE LIMBS BROKEN OFF THE TOPS OF SOME BRADFORD PEAR TREES IN AN INDUSTRIAL AREA JUST SOUTH OF THE RIVERPORT AMPHITHEATRE. WIND SPEED IS UNKNOWN. |
| Aug 10, 1:35 PM CDT | HAIL 0.25 | 1 W Mehlville, MO | |
| Aug 10, 1:37 PM CDT | HAIL 0.5 | Affton, MO | HAIL WAS SPOTTY AND ESTIMATED SIZE WAS SLIGHTLY SMALLER THAN DIMES. |
| Aug 10, 1:40 PM CDT | HAIL 0.5 | 1 Nne Mehlville, MO | REPORT SUBMITTED VIA SOCIAL MEDIA. |
| Aug 10, 1:42 PM CDT | HAIL 0.25 | 1 N Mehlville, MO | |
| Aug 10, 2:05 PM CDT | HAIL 0.75 | Caseyville, IL | HAIL LASTED ABOUT 1 MINUTE. |
| Aug 12, 6:02 PM CDT | TSTM WND DMG | 2 Ene Foristell, MO | LARGE TREE BLOWN OVER ONTO W. MEYER ROAD IN WENTZVILLE. |
| Aug 12, 6:04 PM CDT | TSTM WND DMG | 2 Wnw Wentzville, MO | SEVERAL LARGE TREE BRANCHES DOWN. |
| Aug 12, 6:04 PM CDT | TSTM WND DMG | New Melle, MO | PORTION OF FLAT ROOF PEELED OFF OF ELEMENTARY SCHOOL |
| Aug 12, 6:04 PM CDT | TSTM WND DMG | New Melle, MO | PORTION OF FLAT ROOF PEELED OFF OF ELEMENTARY SCHOOL. |
| Aug 12, 6:04 PM CDT | TSTM WND GST 52 | Flint Hill, MO | NEAR INTERSECTION OF US HIGHWAY 61 AND HIGHWAY P. |
| Aug 12, 6:05 PM CDT | TSTM WND GST 64 | 2 Wsw Wentzville, MO | MODOT OBSERVATION SITE ON INTERSTATE 70. |
| Aug 12, 6:14 PM CDT | TSTM WND DMG | 2 E O'Fallon, MO | SEVERAL TREES BLOWN DOWN NEAR INTERSECTION OF MEXICO ROAD AND BELLEAU CREEK ROAD. |
| Aug 12, 6:15 PM CDT | TSTM WND DMG | 2 E Dardenne Prairie, MO | SEVERAL TREES BLOWN DOWN NEAR INTERSECTION OF HIGHWAYS N AND K. |
| Aug 12, 6:21 PM CDT | TSTM WND DMG | 1 Nne Defiance, MO | TREE AND POWER LINE BLOWN DOWN OVER HIGHWAY DD NEAR INTERSECTION WITH HIGHWAY 94. |
| Aug 12, 6:25 PM CDT | TSTM WND GST 56 | 4 Nw Clarkson Valley, MO | MEASURED KSUS ASOS. |
| Aug 12, 6:29 PM CDT | TSTM WND DMG | 1 Ene Eureka, MO | SHINGLES BLOWN OFF OF A FEW HOUSES. |
| Aug 12, 6:34 PM CDT | TSTM WND DMG | Florissant, MO | LARGE LIMBS DOWN ON HOUSE. |
| Aug 12, 6:34 PM CDT | TSTM WND GST 55 | 2 Ene Maryland Heights, MO | |
| Aug 12, 6:37 PM CDT | TSTM WND DMG | 1 N Kirkwood, MO | SEVERAL TREES AND NUMEROUS TREE LIMBS WERE BLOWN DOWN NEAR THE INTERSECTION OF MANCHESTER ROAD AND GEYER ROAD. |
| Aug 12, 6:37 PM CDT | TSTM WND DMG | Kirkwood, MO | SEVERAL TREES AND NUMEROUS TREE LIMBS BLOWN DOWN NEAR THE INTERSECTION OF MANCHESTER ROAD AND GEYER ROAD. |
| Aug 12, 6:39 PM CDT | TSTM WND GST 58 | 1 Wnw Berkeley, MO | CORRECTS PREVIOUS TSTM WND GST REPORT FROM 1 WNW BERKELEY. WIND GUST REPORTED AT ST. LOUIS-LAMBERT INTERNATIONAL AIRPORT. |
| Aug 12, 6:41 PM CDT | TSTM WND DMG | 1 Sse Webster Groves, MO | TREE DOWN BLOCKING WATSON ROAD. |
| Aug 12, 6:41 PM CDT | TSTM WND DMG | Brentwood, MO | LARGE TREE SNAPPED IN HALF CAUSING DAMAGE TO A HOUSE ON PINE AVENUE NEAR THE INTERSECTION WITH ST. CLAIR IN BRENTWOOD. |
| Aug 12, 6:42 PM CDT | TSTM WND DMG | 1 Nw Shrewsbury, MO | LARGE TREE LIMB BLOWN DOWN. |
| Aug 12, 6:42 PM CDT | TSTM WND GST 58 | 1 Wnw Berkeley, MO | WIND GUST REPORTED AT ST. LOUIS-LAMBERT INTERNATIONAL AIRPORT. |
| Aug 12, 6:51 PM CDT | TSTM WND DMG | Oakville, MO | NUMEROUS TREE LIMBS BLOWN DOWN. |
| Aug 12, 6:54 PM CDT | TSTM WND DMG | Granite City, IL | LARGE TREE BLOWN OVER ONTO ILLINOIS ROUTE 3. |
| Aug 12, 6:54 PM CDT | TSTM WND DMG | Normandy, MO | LIMBS DOWN |
| Aug 12, 6:54 PM CDT | TSTM WND DMG | Normandy, MO | LIMBS DOWN. |
| Aug 12, 6:55 PM CDT | TSTM WND GST 58 | 1 Ssw Hazelwood, MO | |
| Aug 12, 7:00 PM CDT | TSTM WND DMG | Oakville, MO | LARGE TREE LIMBS DOWN. |
| Aug 12, 7:01 PM CDT | TSTM WND GST 67 | 1 Ese Sauget, IL | |
| Aug 12, 7:01 PM CDT | TSTM WND GST 67 | 1 Ne Cahokia, IL | |
| Aug 12, 7:07 PM CDT | TSTM WND DMG | 1 Ssw Collinsville, IL | SEVERAL TREES BLOWN DOWN AROUND TOWN. ALSO, SEVERAL POWER LINES WERE BLOWN DOWN. |
| Aug 12, 7:10 PM CDT | TSTM WND DMG | 2 Sse Belleville, IL | VIA TWITTER PHOTO OF SMALL TREE UPROOTED AND MEDIUM SIZED TREE LIMB SNAPPED. |
| Aug 12, 7:10 PM CDT | TSTM WND DMG | Millstadt, IL | NUMEROUS TREE LIMBS BLOWN DOWN. VIA FACEBOOK. |
| Aug 12, 7:20 PM CDT | TSTM WND DMG | 3 Nnw Freeburg, IL | POWER LINES BLOWN DOWN AT THE INTERSECTION OF ILLINOIS ROUTE 15 AND JEFFERSON ROAD. |
| Aug 12, 7:22 PM CDT | TSTM WND DMG | Freeburg, IL | NUMEROUS TREES AND TREE LIMBS BLOWN DOWN AROUND TOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 8.3 hours before the alert went out and 216 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 4598 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 775 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 3.9
- Supercell composite
- 24.2
The text
As transmitted.
834 WWUS73 KLSX 100820 NPWLSX URGENT - WEATHER MESSAGE National Weather Service St Louis MO 320 AM CDT Tue Aug 10 2021 ILZ100-101-MOZ061-063-064-102330- /O.UPG.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ /O.NEW.KLSX.EH.W.0001.210810T1700Z-210813T0100Z/ Madison IL-Saint Clair-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Saint Charles, Cahokia, Alton, Saint Louis, Belleville, and Edwardsville 320 AM CDT Tue Aug 10 2021 ...EXCESSIVE HEAT WARNING IN EFFECT FROM NOON TODAY TO 8 PM CDT THURSDAY... * WHAT...Dangerously hot conditions with heat index values up to 110 expected. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO and Saint Louis MO Counties. In Illinois, Madison IL and Saint Clair Counties. * WHEN...From Noon today to 8 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ058-079-095>099-102-MOZ018-019-026-027-034>036-041-042-047>052- 059-060-062-065-072>075-084-085-099-102330- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Greene IL-Randolph IL-Adams IL-Brown IL-Pike IL-Calhoun IL-Jersey IL-Monroe IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO- Callaway MO-Montgomery MO-Lincoln MO-Gasconade MO-Warren MO- Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Mount Sterling, Columbia, Quincy, Pittsfield, Sparta, Union, Washington, Mexico, Bowling Green, Jefferson City, Chester, Farmington, Sullivan, Hannibal, and Fulton 320 AM CDT Tue Aug 10 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Heat index values up to 107. * WHERE...Portions of southwest and west central Illinois. Portions of central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ059-060-064-065-069-070-074-102330- /O.CON.KLSX.HT.Y.0004.210810T1700Z-210813T0100Z/ Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-Marion IL- Washington IL- Including the cities of Litchfield, Centralia, Salem, and Vandalia 320 AM CDT Tue Aug 10 2021 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 8 PM CDT THURSDAY... * WHAT...Heat index values up to 108 expected. * WHERE...Bond IL, Clinton IL, Fayette IL, Marion IL, Montgomery IL, Washington IL and Macoupin IL Counties. * WHEN...From Noon today to 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ Glass
6 follow-up statements
278 WWUS73 KLSX 102022 NPWLSX URGENT - WEATHER MESSAGE National Weather Service St Louis MO 322 PM CDT Tue Aug 10 2021 ILZ100-101-MOZ061-063-064-111130- /O.CON.KLSX.EH.W.0001.000000T0000Z-210813T0100Z/ Madison IL-Saint Clair-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Saint Charles, Cahokia, Alton, Saint Louis, Belleville, and Edwardsville 322 PM CDT Tue Aug 10 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Dangerously hot conditions with heat index values up to 113. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO and Saint Louis MO Counties. In Illinois, Madison IL and Saint Clair Counties. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ058-079-095>099-102-MOZ018-019-026-027-034>036-041-042-047>052- 059-060-062-065-072>075-084-085-099-111130- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Greene IL-Randolph IL-Adams IL-Brown IL-Pike IL-Calhoun IL-Jersey IL-Monroe IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO- Callaway MO-Montgomery MO-Lincoln MO-Gasconade MO-Warren MO- Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Mount Sterling, Columbia, Quincy, Pittsfield, Sparta, Union, Washington, Mexico, Bowling Green, Jefferson City, Chester, Farmington, Sullivan, Hannibal, and Fulton 322 PM CDT Tue Aug 10 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Heat index values up to 110. * WHERE...Portions of southwest and west central Illinois. Portions of central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ059-060-064-065-069-070-074-111130- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-Marion IL- Washington IL- Including the cities of Litchfield, Centralia, Salem, and Vandalia 322 PM CDT Tue Aug 10 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Heat index values up to 112. * WHERE...Bond IL, Clinton IL, Fayette IL, Marion IL, Montgomery IL, Washington IL and Macoupin IL Counties. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ Pfahler
294 WWUS73 KLSX 110839 NPWLSX URGENT - WEATHER MESSAGE National Weather Service St Louis MO 339 AM CDT Wed Aug 11 2021 ILZ100-101-MOZ061-063-064-112345- /O.CON.KLSX.EH.W.0001.000000T0000Z-210813T0100Z/ Madison IL-Saint Clair-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Saint Charles, Cahokia, Alton, Saint Louis, Belleville, and Edwardsville 339 AM CDT Wed Aug 11 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Dangerously hot conditions with heat index values up to 110. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO and Saint Louis MO Counties. In Illinois, Madison IL and Saint Clair Counties. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ058-079-095>099-102-MOZ018-019-026-027-034>036-041-042-047>052- 059-060-062-065-072>075-084-085-099-112345- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Greene IL-Randolph IL-Adams IL-Brown IL-Pike IL-Calhoun IL-Jersey IL-Monroe IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO- Callaway MO-Montgomery MO-Lincoln MO-Gasconade MO-Warren MO- Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Mount Sterling, Columbia, Quincy, Pittsfield, Sparta, Union, Washington, Mexico, Bowling Green, Jefferson City, Chester, Farmington, Sullivan, Hannibal, and Fulton 339 AM CDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Heat index values up to 108. * WHERE...Portions of southwest and west central Illinois. Portions of central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ059-060-064-065-069-070-074-112345- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-Marion IL- Washington IL- Including the cities of Litchfield, Centralia, Salem, and Vandalia 339 AM CDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Heat index values up to 110. * WHERE...Bond IL, Clinton IL, Fayette IL, Marion IL, Montgomery IL, Washington IL and Macoupin IL Counties. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ Glass
549 WWUS73 KLSX 111943 NPWLSX URGENT - WEATHER MESSAGE National Weather Service St Louis MO 243 PM CDT Wed Aug 11 2021 ILZ100-101-MOZ061-063-064-121045- /O.CON.KLSX.EH.W.0001.000000T0000Z-210813T0100Z/ Madison IL-Saint Clair-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Saint Charles, Cahokia, Alton, Saint Louis, Belleville, and Edwardsville 243 PM CDT Wed Aug 11 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Dangerously hot conditions with heat index values up to 111. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO and Saint Louis MO Counties. In Illinois, Madison IL and Saint Clair Counties. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ058-079-095>099-102-MOZ018-019-026-027-034>036-041-042-047>052- 059-060-062-065-072>075-084-085-099-121045- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Greene IL-Randolph IL-Adams IL-Brown IL-Pike IL-Calhoun IL-Jersey IL-Monroe IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO- Callaway MO-Montgomery MO-Lincoln MO-Gasconade MO-Warren MO- Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Mount Sterling, Columbia, Quincy, Pittsfield, Sparta, Union, Washington, Mexico, Bowling Green, Jefferson City, Chester, Farmington, Sullivan, Hannibal, and Fulton 243 PM CDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Heat index values up to 108. * WHERE...Portions of southwest and west central Illinois. Portions of central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ059-060-064-065-069-070-074-121045- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-Marion IL- Washington IL- Including the cities of Litchfield, Centralia, Salem, and Vandalia 243 PM CDT Wed Aug 11 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THURSDAY... * WHAT...Heat index values up to 110. * WHERE...Bond IL, Clinton IL, Fayette IL, Marion IL, Montgomery IL, Washington IL and Macoupin IL Counties. * WHEN...Until 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ Pfahler
195 WWUS73 KLSX 120904 NPWLSX URGENT - WEATHER MESSAGE National Weather Service St Louis MO 404 AM CDT Thu Aug 12 2021 ILZ100-101-MOZ061-063-064-130015- /O.CON.KLSX.EH.W.0001.000000T0000Z-210813T0100Z/ Madison IL-Saint Clair-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Saint Charles, Cahokia, Alton, Saint Louis, Belleville, and Edwardsville 404 AM CDT Thu Aug 12 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values up to 110. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO and Saint Louis MO Counties. In Illinois, Madison IL and Saint Clair Counties. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. && $$ ILZ058-079-095>099-102-MOZ018-019-026-027-034>036-041-042-047>052- 059-060-062-065-072>075-084-085-099-130015- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Greene IL-Randolph IL-Adams IL-Brown IL-Pike IL-Calhoun IL-Jersey IL-Monroe IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO- Callaway MO-Montgomery MO-Lincoln MO-Gasconade MO-Warren MO- Franklin MO-Jefferson MO-Crawford MO-Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Mount Sterling, Columbia, Quincy, Pittsfield, Sparta, Union, Washington, Mexico, Bowling Green, Jefferson City, Chester, Farmington, Sullivan, Hannibal, and Fulton 404 AM CDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Heat index values up to 105. * WHERE...Portions of southwest and west central Illinois. Portions of central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ059-060-064-065-069-070-074-130015- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-Marion IL- Washington IL- Including the cities of Litchfield, Centralia, Salem, and Vandalia 404 AM CDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Heat index values up to 108. * WHERE...Bond IL, Clinton IL, Fayette IL, Marion IL, Montgomery IL, Washington IL and Macoupin IL Counties. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ Glass
609 WWUS73 KLSX 121956 NPWLSX URGENT - WEATHER MESSAGE National Weather Service St Louis MO 256 PM CDT Thu Aug 12 2021 ILZ095-096-MOZ018-019-026-027-122100- /O.CAN.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Adams IL-Brown IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Including the cities of Hannibal, Mount Sterling, and Quincy 256 PM CDT Thu Aug 12 2021 ...HEAT ADVISORY IS CANCELLED... Showers and thunderstorms have significantly cooled temperatures this afternoon across the area. Therefore, heat index values are no longer expected to reach dangerous levels. $$ ILZ100-101-MOZ061-063-064-130100- /O.CON.KLSX.EH.W.0001.000000T0000Z-210813T0100Z/ Madison IL-Saint Clair-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Saint Charles, Cahokia, Alton, Saint Louis, Belleville, and Edwardsville 256 PM CDT Thu Aug 12 2021 ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values up to 107. * WHERE...In Missouri, Saint Charles MO, Saint Louis City MO and Saint Louis MO Counties. In Illinois, Madison IL and Saint Clair Counties. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. && $$ ILZ058-079-097>099-102-MOZ034>036-041-042-047>052-059-060-062-065- 072>075-084-085-099-130100- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Greene IL-Randolph IL-Pike IL-Calhoun IL-Jersey IL-Monroe IL- Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-Lincoln MO-Gasconade MO- Warren MO-Franklin MO-Jefferson MO-Crawford MO-Washington MO- Saint Francois MO-Sainte Genevieve MO-Iron MO-Madison MO-Reynolds MO- Including the cities of Columbia, Pittsfield, Mexico, Union, Washington, Sparta, Bowling Green, Jefferson City, Chester, Farmington, Sullivan, and Fulton 256 PM CDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Heat index values up to 105. * WHERE...Portions of southwest and west central Illinois. Portions of central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ILZ059-060-064-065-069-070-074-130100- /O.CON.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-Marion IL- Washington IL- Including the cities of Litchfield, Centralia, Salem, and Vandalia 256 PM CDT Thu Aug 12 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Heat index values up to 106. * WHERE...Bond IL, Clinton IL, Fayette IL, Marion IL, Montgomery IL, Washington IL and Macoupin IL Counties. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ Pfahler
321 WWUS73 KLSX 130054 NPWLSX URGENT - WEATHER MESSAGE National Weather Service St Louis MO 754 PM CDT Thu Aug 12 2021 ILZ100-101-MOZ061-063-064-130200- /O.EXP.KLSX.EH.W.0001.000000T0000Z-210813T0100Z/ Madison IL-Saint Clair-Saint Charles MO-Saint Louis MO-Saint Louis City MO- Including the cities of Saint Charles, Cahokia, Alton, Saint Louis, Belleville, and Edwardsville 754 PM CDT Thu Aug 12 2021 ...EXCESSIVE HEAT WARNING WILL EXPIRE AT 8 PM CDT THIS EVENING... Cooler air has moved into the region ending the dangerous heat. $$ ILZ058>060-064-065-069-070-074-079-097>099-102-MOZ034>036-041-042- 047>052-059-060-062-065-072>075-084-085-099-130200- /O.EXP.KLSX.HT.Y.0004.000000T0000Z-210813T0100Z/ Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Pike IL-Calhoun IL-Jersey IL- Monroe IL-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-Lincoln MO- Gasconade MO-Warren MO-Franklin MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- Including the cities of Columbia, Pittsfield, Sparta, Litchfield, Washington, Mexico, Bowling Green, Centralia, Jefferson City, Salem, Chester, Union, Farmington, Sullivan, Vandalia, and Fulton 754 PM CDT Thu Aug 12 2021 ...HEAT ADVISORY WILL EXPIRE AT 8 PM CDT THIS EVENING... Cooler air has moved into the region ending the dangerous heat. $$ Britt
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 3:38 AM CDT | Flash Flood Warning | LSX | Reynolds | 3 hr |
Nearby
Excessive Heat Warnings in Missouri, 2021Excessive Heat Warnings in Illinois, 2021Every excessive heat warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.