Alert archive / Illinois / Heat Advisories in 2020
Heat Advisory 4, NWS St. Louis, MO
NWS St. Louis, MO issued this heat advisory at Aug 9, 2020, 1:54 PM CDT for 13 counties in Missouri; 14 counties in Illinois. It took effect at Aug 10, 2020, 12:00 PM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Aug 9, 2020, 1:54 PM CDT (18:54 UTC)
- In effect from
- Aug 10, 2020, 12:00 PM CDT
- Expired
- Aug 10, 2020, 7:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS St. Louis, MO
All 27 counties
Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 47 km from the middle of the area, began a volume at 18:56 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.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 6.9 hours before the alert went out and 229 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
- 221 J/kg
- Mixed-layer CIN
- -272 J/kg
- Mixed-layer LCL
- 941 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -48 m²/s²
- 0-3 km storm-relative helicity
- 8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS St. Louis, MO wrote its last area forecast discussion before this heat advisory went out at Aug 9, 12:55 PM CDT, 59 minutes earlier.
Area forecast discussion, Aug 9, 12:55 PM CDT, 59 minutes before
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</html>Hazardous weather outlook, Aug 9, 4:24 AM CDT, 9 hours 30 minutes before
Hazardous Weather Outlook National Weather Service Saint Louis MO 424 AM CDT Sun Aug 9 2020 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-100930- Adams IL-Audrain MO-Bond IL-Boone MO-Brown IL-Calhoun IL-Callaway MO- Clinton IL-Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO- Greene IL-Iron MO-Jefferson MO-Jersey IL-Knox MO-Lewis MO-Lincoln MO- Macoupin IL-Madison IL-Madison MO-Marion IL-Marion MO-Moniteau MO- Monroe IL-Monroe MO-Montgomery IL-Montgomery MO-Osage MO-Pike IL- Pike MO-Ralls MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair IL-Saint Francois MO-Saint Louis City MO-Saint Louis MO- Sainte Genevieve MO-Shelby MO-Warren MO-Washington IL-Washington MO- 424 AM CDT Sun Aug 9 2020 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Today and tonight. Numerous thunderstorms are expected this morning in eastern Missouri and southwestern Illinois. Heavy rainfall is likely, which may result in flash flooding through the morning. A Flash Flood Watch is in effect through the morning. Isolated severe thunderstorms are possible this evening and overnight, primarily across northeastern Missouri and west-central Illinois. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Dangerous heat is possible on Monday afternoon, with heat index values of 100-105 degrees in east-central and southeastern Missouri as well as southwestern Illinois. There is a chance of isolated severe thunderstorms Monday. Thunderstorms are possible Tuesday through Saturday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed in northeastern Missouri and west- central Illinois Sunday evening and night and then again Monday afternoon and evening. Elmore
In the hours before
Local storm report, Aug 9, 1:28 PM CDT, 26 minutes before
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</html>Local storm report, Aug 9, 1:29 PM CDT, 25 minutes before
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</html>Local storm report, Aug 9, 1:34 PM CDT, 20 minutes before
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</html>Local storm report, Aug 9, 1:44 PM CDT, 10 minutes before
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</html>Local storm report, Aug 9, 1:45 PM CDT, 9 minutes before
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</html>Local storm report, Aug 9, 1:49 PM CDT, 5 minutes before
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</html>The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 10:50 PM CDT | Areal Flood Advisory | LSX | Lincoln, Pike | 6 hr |
| Aug 8, 11:03 PM CDT | Flash Flood Warning | LSX | Lincoln, Pike | 6 hr |
| Aug 9, 12:01 AM CDT | Flash Flood Warning | LSX | Saint Charles | 6 hr |
| Aug 9, 12:56 AM CDT | Areal Flood Advisory | LSX | Saint Louis | 3 hr |
| Aug 9, 1:15 AM CDT | River Flood Warning | LSX | Saint Charles | 22 hr |
| Aug 9, 1:25 AM CDT | Flash Flood Warning | LSX | Saint Louis | 6 hr |
| Aug 9, 2:27 AM CDT | Areal Flood Advisory | LSX | Saint Charles, Warren | 4 hr |
| Aug 9, 2:41 AM CDT | Flash Flood Warning | LSX | Jefferson, Saint Louis, City of Saint Louis | 6 hr |
| Aug 9, 3:54 AM CDT | Areal Flood Advisory | LSX | Franklin, Gasconade | 4 hr |
| Aug 9, 7:29 AM CDT | Areal Flood Warning | LSX | Saint Louis | 3 hr |
| Aug 9, 9:55 AM CDT | Areal Flood Advisory | LSX | Madison, Saint Clair | 3 hr |
| Aug 9, 10:06 AM CDT | Flash Flood Warning | LSX | Madison | 4 hr |
| Aug 9, 10:23 AM CDT | Flash Flood Warning | LSX | Saint Clair | 4 hr |
| Aug 9, 2:07 PM CDT | Areal Flood Warning | LSX | Saint Clair | 3 hr |
Nearby
Heat Advisories in Illinois, 2020Heat Advisories in Missouri, 2020Every heat advisory in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.