Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 161, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 31, 2021, 9:03 PM CDT for Saint Francois County, Washington County, Missouri. It was in force for 42 min. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 31, 2021, 9:03 PM CDT (02:03 UTC)
- Expired
- Aug 31, 2021, 9:45 PM CDT
- In force
- 42 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
The radar
The St Louis radar (KLSX), 80 km from the middle of the area, began a volume at 02:02 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 31, 9:05 PM CDT | TSTM WND DMG | 1 Ese Old Mines, MO | TREE DOWN AT HIGHWAY 21 AND HIGHWAY 47. |
| Aug 31, 9:05 PM CDT | TSTM WND DMG | 1 S Old Mines, MO | POWER LINE KNOCKED OVER ALONG HIGHWAY 21. |
| Aug 31, 9:07 PM CDT | TSTM WND GST 60 | Old Mines, MO | ALSO, VERY HEAVY RAINFALL. |
| Aug 31, 9:23 PM CDT | TSTM WND DMG | 2 Wnw Frankclay, MO | TREE DOWN AT HIGHWAY 8 AND GERMANIA. |
| Aug 31, 9:26 PM CDT | TSTM WND DMG | 2 Sw Bonne Terre, MO | EMERGENCY MANAGER REPORTED 50-60 ESTIMATED WINDS. SOME SIDING FROM A NEIGHBOR WAS BLOWN INTO THEIR YARD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 2.1 hours before the alert went out and 292 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
- 208 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 1625 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
779 WUUS53 KLSX 010203 SVRLSX MOC187-221-010245- /O.NEW.KLSX.SV.W.0161.210901T0203Z-210901T0245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service St Louis MO 903 PM CDT Tue Aug 31 2021 The National Weather Service in St Louis has issued a * Severe Thunderstorm Warning for... Eastern Washington County in east central Missouri... West central St. Francois County in southeastern Missouri... * Until 945 PM CDT. * At 902 PM CDT, a severe thunderstorm was located over Old Mines, moving south at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Potosi, Leadwood, Irondale, Mineral Point, Old Mines, Frankclay and Cadet. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3807 9091 3812 9070 3785 9058 3780 9084 TIME...MOT...LOC 0202Z 343DEG 21KT 3805 9079 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Byrd
1 follow-up statement
985 WWUS53 KLSX 010227 SVSLSX Severe Weather Statement National Weather Service St Louis MO 927 PM CDT Tue Aug 31 2021 MOC187-221-010245- /O.CON.KLSX.SV.W.0161.000000T0000Z-210901T0245Z/ Washington MO-St. Francois MO- 927 PM CDT Tue Aug 31 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR SOUTHEASTERN WASHINGTON AND WEST CENTRAL ST. FRANCOIS COUNTIES... At 927 PM CDT, a severe thunderstorm was located over Mineral Point, moving south at 25 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Potosi, Leadwood, Irondale and Frankclay. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3789 9081 3799 9064 3785 9058 3780 9084 TIME...MOT...LOC 0227Z 343DEG 21KT 3791 9074 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Byrd
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 9:31 PM CDT | Severe Thunderstorm Warning | LSX | Saint Francois, Washington | 44 min |
| Aug 31, 9:49 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds, Saint Francois | 41 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2021Every severe thunderstorm 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.