Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 162, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 31, 2021, 9:31 PM CDT for Saint Francois County, Washington County, Missouri. It was in force for 44 min. 1 report 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, 9:31 PM CDT (02:31 UTC)
- Expired
- Aug 31, 2021, 10:15 PM CDT
- In force
- 44 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), 103 km from the middle of the area, began a volume at 02:32 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, 9:33 PM CDT | TSTM WND DMG | 3 Nne Bismarck, MO | TREE DOWN OVER HIGHWAY 32 AND OLD IRONDALE ROAD. |
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, 2.5 hours before the alert went out and 302 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.
338
WUUS53 KLSX 010231
SVRLSX
MOC187-221-010315-
/O.NEW.KLSX.SV.W.0162.210901T0231Z-210901T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
931 PM CDT Tue Aug 31 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southeastern Washington County in east central Missouri...
St. Francois County in southeastern Missouri...
* Until 1015 PM CDT.
* At 930 PM CDT, a severe thunderstorm was located over Leadwood,
moving southeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Farmington, Bonne Terre, Desloge, Bismarck, Leadwood, Park Hills,
Iron Mountain Lake, Irondale, Knob Lick, Iron Mountain, Leadington,
Libertyville, Frankclay and Doe Run.
This also includes St. Joe State Park and Missouri Mines Historic
Site.
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 3768 9065 3773 9065 3774 9068 3790 9077
3801 9058 3789 9045 3788 9046 3765 9019
3764 9063
TIME...MOT...LOC 0230Z 326DEG 26KT 3789 9062
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Byrd2 follow-up statements
900
WWUS53 KLSX 010254
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
954 PM CDT Tue Aug 31 2021
MOC221-010303-
/O.CAN.KLSX.SV.W.0162.000000T0000Z-210901T0315Z/
Washington MO-
954 PM CDT Tue Aug 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3768 9065 3782 9063 3793 9050 3789 9045
3788 9046 3765 9019 3764 9063
TIME...MOT...LOC 0253Z 326DEG 26KT 3775 9050
$$
MOC187-010315-
/O.CON.KLSX.SV.W.0162.000000T0000Z-210901T0315Z/
St. Francois MO-
954 PM CDT Tue Aug 31 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR ST. FRANCOIS COUNTY...
At 953 PM CDT, a severe thunderstorm was located near Farmington,
moving southeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Farmington, Bonne Terre, Desloge, Bismarck, Leadwood, Park Hills,
Iron Mountain Lake, Iron Mountain, Knob Lick, Leadington,
Libertyville and Doe Run.
This also includes St. Joe State Park and Missouri Mines Historic
Site.
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 3768 9065 3782 9063 3793 9050 3789 9045
3788 9046 3765 9019 3764 9063
TIME...MOT...LOC 0253Z 326DEG 26KT 3775 9050
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Byrd538
WWUS53 KLSX 010311
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1011 PM CDT Tue Aug 31 2021
MOC187-010321-
/O.EXP.KLSX.SV.W.0162.000000T0000Z-210901T0315Z/
St. Francois MO-
1011 PM CDT Tue Aug 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR ST. FRANCOIS COUNTY WILL
EXPIRE AT 1015 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
LAT...LON 3768 9065 3782 9063 3793 9050 3789 9045
3788 9046 3765 9019 3764 9063
TIME...MOT...LOC 0311Z 326DEG 26KT 3765 9041
$$
ByrdThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 9:03 PM CDT | Severe Thunderstorm Warning | LSX | Saint Francois, Washington | 42 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.