Alert archive / Missouri / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 197, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 17, 2025, 6:06 PM CDT for Saint Louis County, Missouri. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 17, 2025, 6:06 PM CDT (23:06 UTC)
- Expired
- Aug 17, 2025, 6:30 PM CDT
- In force
- 24 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Saint Louis County, MO
The radar
The St Louis radar (KLSX), 22 km from the middle of the area, began a volume at 23:09 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 12:00Z, 11.1 hours before the alert went out and 331 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
- 3183 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 941 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.1
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 17, 5:59 PM CDT, 7 minutes earlier.
Area forecast discussion, Aug 17, 5:59 PM CDT, 7 minutes before
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</html>Hazardous weather outlook, Aug 17, 2:35 PM CDT, 3 hours 31 minutes before
Hazardous Weather Outlook National Weather Service St Louis MO 235 PM CDT Sun Aug 17 2025 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-181945- Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair 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-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- 235 PM CDT Sun Aug 17 2025 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Tonight. Dangerous heat and humidity will continue into early this evening. Scattered thunderstorms are forecast this evening. A few thunderstorms may produce gusty winds. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Dangerous heat and humidity is expected through at least Monday. Please see the heat advisory product for more details. There is a chance of thunderstorms for portions of the area Monday afternoon and evening. There are additional chances of thunderstorms late Monday night through Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Gosselin
In the hours before
Local storm report, Aug 17, 5:07 PM CDT, 59 minutes before
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</html>Local storm report, Aug 17, 5:09 PM CDT, 57 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 17, 3:08 PM CDT | Areal Flood Advisory | LSX | Marion | 3 hr |
| Aug 17, 4:19 PM CDT | Areal Flood Advisory | LSX | Ralls | 3 hr |
| Aug 17, 2:30 PM CDT | Areal Flood Advisory | LSX | Adams | 41 min |
| Aug 17, 3:11 PM CDT | Flash Flood Warning | LSX | Adams | 106 min |
| Aug 17, 4:57 PM CDT | Areal Flood Warning | LSX | Adams | 78 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2025Every severe thunderstorm warning in 2025
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.