Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 1, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 11, 2021, 12:43 PM CST for 4 counties in Missouri. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Mar 11, 2021, 12:43 PM CST (18:43 UTC)
- Expired
- Mar 11, 2021, 1:05 PM CST
- In force
- 22 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Iron County, MO, Madison County, MO, Saint Francois County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 113 km from the middle of the area, began a volume at 18:42 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, 6.7 hours before the alert went out and 313 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
- 2 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 500 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
026
WUUS53 KLSX 111843
SVRLSX
MOC093-123-186-187-111930-
/O.NEW.KLSX.SV.W.0001.210311T1843Z-210311T1930Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1243 PM CST Thu Mar 11 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Northeastern Iron County in southeastern Missouri...
Southern Ste. Genevieve County in southeastern Missouri...
Northern Madison County in southeastern Missouri...
Southern St. Francois County in southeastern Missouri...
* Until 130 PM CST.
* At 1242 PM CST, a severe thunderstorm was located over Iron
Mountain, moving east at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Farmington, Fredericktown, Bismarck, Ironton, Park Hills, Pilot
Knob, Iron Mountain Lake, Womac, Knob Lick, Iron Mountain, Coffman,
Roselle, Granite, Minnith, Mine La Motte, Libertyville, Doe Run and
River Aux Vases.
This includes Interstate 55 in Missouri near exit 143.
This also includes Hawn State Park, Fort Davidson Historic Site, and
Elephant Rocks State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3761 9072 3774 9077 3773 9065 3777 9064
3789 9003 3780 9001 3768 9011 3764 9015
3758 9015
TIME...MOT...LOC 1842Z 259DEG 35KT 3767 9065
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
Carney2 follow-up statements
662
WWUS53 KLSX 111856
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1256 PM CST Thu Mar 11 2021
MOC093-111906-
/O.CAN.KLSX.SV.W.0001.000000T0000Z-210311T1930Z/
Iron MO-
1256 PM CST Thu Mar 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN IRON COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3760 9053 3764 9054 3765 9065 3773 9065
3777 9064 3789 9003 3780 9001 3768 9011
3764 9015 3758 9015
TIME...MOT...LOC 1856Z 257DEG 29KT 3769 9052
$$
MOC123-186-187-111930-
/O.CON.KLSX.SV.W.0001.000000T0000Z-210311T1930Z/
Ste. Genevieve MO-Madison MO-St. Francois MO-
1256 PM CST Thu Mar 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM CST
FOR SOUTHERN STE. GENEVIEVE...NORTHERN MADISON AND SOUTHERN ST.
FRANCOIS COUNTIES IN SOUTHEASTERN MISSOURI...
At 1256 PM CST, a severe thunderstorm was located near Iron Mountain
Lake, moving east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Farmington, Fredericktown, Bismarck, Park Hills, Iron Mountain Lake,
Womac, Knob Lick, Iron Mountain, Coffman, Minnith, Mine La Motte,
Libertyville, Doe Run and River Aux Vases.
This also includes Hawn State Park.
This includes Interstate 55 in Missouri near exit 143.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3760 9053 3764 9054 3765 9065 3773 9065
3777 9064 3789 9003 3780 9001 3768 9011
3764 9015 3758 9015
TIME...MOT...LOC 1856Z 257DEG 29KT 3769 9052
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
Carney499
WWUS53 KLSX 111905
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
105 PM CST Thu Mar 11 2021
MOC123-186-187-111915-
/O.CAN.KLSX.SV.W.0001.000000T0000Z-210311T1930Z/
Ste. Genevieve MO-Madison MO-St. Francois MO-
105 PM CST Thu Mar 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN STE. GENEVIEVE...
NORTHERN MADISON AND SOUTHERN ST. FRANCOIS COUNTIES IN SOUTHEASTERN
MISSOURI IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 3760 9053 3764 9054 3765 9065 3773 9065
3777 9064 3789 9003 3780 9001 3768 9011
3764 9015 3758 9015
TIME...MOT...LOC 1904Z 259DEG 35KT 3771 9040
$$
CarneyThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 11, 3:27 AM CST | Flood Watch | LSX | Boone, Callaway, Cole, Crawford, Franklin, Gasconade and 14 more | 55 hr |
| Mar 11, 1:58 PM CST | Severe Thunderstorm Warning | LSX | Iron, Madison, Sainte Genevieve, Saint Francois | 47 min |
| Mar 11, 3:38 PM CST | Areal Flood Advisory | LSX | Crawford, Iron, Sainte Genevieve, Saint Francois, Washington | 3 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.