Alert archive / Illinois / Heat Advisories in 2020
Heat Advisory 1, NWS St. Louis, MO
NWS St. Louis, MO issued this heat advisory at Jul 8, 2020, 3:27 AM CDT for 4 counties in Missouri; 6 counties in Illinois. It took effect at Jul 8, 2020, 11:00 AM CDT. It was in force for 32 hr.
The area
The counties it named.
The facts
- Issued
- Jul 8, 2020, 3:27 AM CDT (08:27 UTC)
- In effect from
- Jul 8, 2020, 11:00 AM CDT
- Expired
- Jul 9, 2020, 7:00 PM CDT
- In force
- 32 hr
- Issued by
- NWS St. Louis, MO
Counties Clinton County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 65 km from the middle of the area, began a volume at 08:29 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
Davenport, (KDVN), launched 00:00Z, 8.5 hours before the alert went out and 344 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
- 1352 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1541 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 25 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 Jul 8, 12:22 AM CDT, 3 hours 5 minutes earlier.
Area forecast discussion, Jul 8, 12:22 AM CDT, 3 hours 5 minutes before
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</html>Hazardous weather outlook, Jul 7, 9:49 PM CDT, 5 hours 38 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 |
|---|---|---|---|---|
| Jul 8, 4:17 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve | 28 min |
| Jul 8, 2:48 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 42 min |
| Jul 8, 6:27 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Fayette | 33 min |
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.