Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 197, NWS St. Louis, MO

December 10, 2021Madison County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Dec 10, 2021, 10:55 PM CST for Madison County, Missouri. It was in force for 18 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
Dec 10, 2021, 10:55 PM CST (04:55 UTC)
Expired
Dec 10, 2021, 11:13 PM CST
In force
18 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

County Madison County, MO

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Dec 10, 3:07 PM CSTTornado WatchSPC11 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 4.9 hours before the alert went out and 286 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.

Skew-T log-pSkew-T log-p diagram, Little Rock, AR at 00:00Z on 2021-12-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1725 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 00:00Z on 2021-12-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 398 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1725 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
759 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
398 m²/s²
0-3 km storm-relative helicity
420 m²/s²
Significant tornado parameter
4.8
Supercell composite
16.2

Open this sounding in Storm Lab

The text

As transmitted.

551 
WUUS53 KLSX 110455
SVRLSX
MOC123-110530-
/O.NEW.KLSX.SV.W.0197.211211T0455Z-211211T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1055 PM CST Fri Dec 10 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southern Madison County in southeastern Missouri...

* Until 1130 PM CST.

* At 1055 PM CST, a severe thunderstorm was located near Saco, moving
  northeast at 75 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Marquand around 1105 PM CST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 AM CST for southeastern
Missouri.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until 200 AM CST for southeastern
Missouri.

&&

LAT...LON 3732 9049 3739 9053 3755 9014 3731 9015
TIME...MOT...LOC 0455Z 245DEG 67KT 3735 9038 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Britt
1 follow-up statement
525 
WWUS53 KLSX 110513
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
1113 PM CST Fri Dec 10 2021

MOC123-110523-
/O.CAN.KLSX.SV.W.0197.000000T0000Z-211211T0530Z/
Madison MO-
1113 PM CST Fri Dec 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MADISON COUNTY IN
SOUTHEASTERN MISSOURI IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 200 AM CST for southeastern
Missouri.

LAT...LON 3732 9049 3739 9053 3755 9014 3731 9015
TIME...MOT...LOC 0510Z 245DEG 67KT 3749 9000 

$$

Britt

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 10, 6:13 PM CSTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau47 min
Dec 10, 6:18 PM CSTSevere Thunderstorm WarningLSXCole, Osage42 min
Dec 10, 6:27 PM CSTTornado WarningLSXAudrain, Callaway34 min
Dec 10, 6:30 PM CSTTornado WarningLSXCallaway, Cole, Gasconade, Montgomery, Osage45 min
Dec 10, 6:42 PM CSTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade, Osage48 min
Dec 10, 6:42 PM CSTTornado WarningLSXPike48 min
Dec 10, 6:49 PM CSTTornado WarningLSXFranklin, Gasconade, Osage, Warren41 min
Dec 10, 6:50 PM CSTTornado WarningLSXAudrain, Callaway, Montgomery, Pike, Ralls40 min
Dec 10, 7:00 PM CSTTornado WarningLSXGasconade, Lincoln, Montgomery, Pike, Warren45 min
Dec 10, 7:02 PM CSTTornado WarningLSXCrawford, Franklin, Gasconade43 min
Dec 10, 7:11 PM CSTTornado WarningLSXLincoln, Montgomery, Pike49 min
Dec 10, 7:16 PM CSTTornado WarningLSXFranklin, Lincoln, Saint Charles, Warren44 min
Dec 10, 7:30 PM CSTTornado WarningLSXLincoln45 min
Dec 10, 7:35 PM CSTTornado Warning Tornado observedLSXFranklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren40 min
Dec 10, 7:49 PM CSTSevere Thunderstorm WarningLSXCrawford, Washington26 min
Dec 10, 8:06 PM CSTTornado Warning Tornado observedLSXSaint Charles, Saint Louis, City of Saint Louis39 min
Dec 10, 8:10 PM CSTSevere Thunderstorm WarningLSXFranklin35 min
Dec 10, 8:29 PM CSTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis, City of Saint Louis30 min
Dec 10, 8:34 PM CSTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade, Osage41 min
Dec 10, 8:47 PM CSTTornado WarningLSXFranklin, Gasconade, Warren43 min
Dec 10, 9:07 PM CSTSevere Thunderstorm WarningLSXFranklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more38 min
Dec 10, 9:39 PM CSTTornado WarningLSXSaint Charles, Saint Louis51 min
Dec 10, 10:00 PM CSTSevere Thunderstorm WarningLSXIron, Reynolds45 min
Dec 10, 10:05 PM CSTSevere Thunderstorm WarningLSXCity of Saint Louis25 min
Dec 10, 10:14 PM CSTTornado WarningLSXIron, Madison, Reynolds46 min
Dec 10, 10:19 PM CSTSevere Thunderstorm WarningLSXJefferson, Sainte Genevieve, Saint Francois41 min
Dec 10, 10:26 PM CSTSevere Thunderstorm WarningLSXReynolds20 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; the sounding from the Mesonet's radiosonde archive.