Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 176, NWS St. Louis, MO

October 24, 20214 counties in Missouri; Monroe County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Oct 24, 2021, 7:39 PM CDT for 4 counties in Missouri; Monroe County, Illinois. It was in force for 51 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
Oct 24, 2021, 7:39 PM CDT (00:39 UTC)
Expired
Oct 24, 2021, 8:30 PM CDT
In force
51 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

Counties Monroe County, IL, Jefferson County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 00:38 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 watch it was issued in

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

IssuedProductOfficeLasted
Oct 24, 2:06 PM CDTTornado WatchSPC9 hr
Oct 24, 5:44 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.7 hours before the alert went out and 280 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, Lincoln, IL at 00:00Z on 2021-10-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2021-10-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 371 square meters per square second.19395878Sfc1 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
3 J/kg
Mixed-layer CIN
-286 J/kg
Mixed-layer LCL
585 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
371 m²/s²
0-3 km storm-relative helicity
467 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

As transmitted.

505 
WUUS53 KLSX 250039
SVRLSX
ILC133-MOC099-186-187-221-250130-
/O.NEW.KLSX.SV.W.0176.211025T0039Z-211025T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
739 PM CDT Sun Oct 24 2021

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southwestern Monroe County in southwestern Illinois...
  Southeastern Jefferson County in east central Missouri...
  Northwestern Ste. Genevieve County in southeastern Missouri...
  Southeastern Washington County in east central Missouri...
  Northwestern St. Francois County in southeastern Missouri...

* Until 830 PM CDT.

* At 739 PM CDT, a severe thunderstorm was located near Irondale,
  moving northeast at 35 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...
  Leadwood around 750 PM CDT.
  Bonne Terre and Desloge around 755 PM CDT.

Other locations in the path of this severe thunderstorm include
Olympian Village.

This includes Interstate 55 in Missouri between exits 157 and 174.
 
This also includes St. Francois State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for east central
Missouri. A Tornado Watch also remains in effect until 100 AM CDT for
southwestern Illinois...and southeastern Missouri.

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

A Tornado Watch remains in effect until 1000 PM CDT for east central
Missouri. A Tornado Watch also remains in effect until 100 AM CDT for
southwestern Illinois...and southeastern Missouri.

&&

LAT...LON 3798 9081 3826 9030 3810 9017 3809 9018
      3809 9021 3807 9017 3807 9015 3803 9012
      3776 9079
TIME...MOT...LOC 0039Z 234DEG 32KT 3788 9072 

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

$$

Glass
1 follow-up statement
138 
WWUS53 KLSX 250052
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
752 PM CDT Sun Oct 24 2021

MOC221-250102-
/O.CAN.KLSX.SV.W.0176.000000T0000Z-211025T0130Z/
Washington MO-
752 PM CDT Sun Oct 24 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.

A Tornado Watch remains in effect until 1000 PM CDT for east central
Missouri. A Tornado Watch also remains in effect until 100 AM CDT for
southwestern Illinois...and southeastern Missouri.

LAT...LON 3807 9064 3826 9030 3811 9017 3810 9017
      3809 9021 3807 9017 3807 9015 3803 9012
      3782 9064
TIME...MOT...LOC 0052Z 243DEG 32KT 3791 9056 

$$

ILC133-MOC099-186-187-250130-
/O.CON.KLSX.SV.W.0176.000000T0000Z-211025T0130Z/
Monroe IL-Jefferson MO-Ste. Genevieve MO-St. Francois MO-
752 PM CDT Sun Oct 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR SOUTHWESTERN MONROE...SOUTHEASTERN JEFFERSON...NORTHWESTERN STE.
GENEVIEVE AND NORTHWESTERN ST. FRANCOIS COUNTIES...

At 752 PM CDT, a severe thunderstorm was located over Bonne Terre,
moving northeast at 35 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.

Locations impacted include...
  Bloomsdale.

This also includes St. Francois State Park.
 
This includes Interstate 55 in Missouri between exits 157 and 174.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for east central
Missouri. A Tornado Watch also remains in effect until 100 AM CDT for
southwestern Illinois...and southeastern Missouri.

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

&&

LAT...LON 3807 9064 3826 9030 3811 9017 3810 9017
      3809 9021 3807 9017 3807 9015 3803 9012
      3782 9064
TIME...MOT...LOC 0052Z 243DEG 32KT 3791 9056 

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

$$

Glass

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 24, 7:00 PM CDTSevere Thunderstorm WarningLSXPike34 min
Oct 24, 7:03 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Warren42 min
Oct 24, 7:06 PM CDTTornado WarningLSXReynolds39 min
Oct 24, 7:07 PM CDTSevere Thunderstorm WarningLSXCallaway, Franklin, Gasconade, Montgomery, Osage, Warren38 min
Oct 24, 7:09 PM CDTTornado WarningLSXCrawford, Iron, Washington31 min
Oct 24, 7:37 PM CDTSevere Thunderstorm WarningLSXReynolds38 min
Oct 24, 7:48 PM CDTTornado WarningLSXIron, Madison, Reynolds, Saint Francois27 min
Oct 24, 8:03 PM CDTTornado WarningLSXSainte Genevieve, Saint Francois42 min
Oct 24, 8:09 PM CDTTornado WarningLSXSainte Genevieve, Saint Francois40 min
Oct 24, 8:10 PM CDTTornado WarningLSXIron, Madison, Reynolds50 min
Oct 24, 8:23 PM CDTTornado WarningLSXIron, Madison, Reynolds52 min
Oct 24, 8:34 PM CDTTornado Warning Tornado observedConsiderable damage threatLSXSainte Genevieve41 min
Oct 24, 8:48 PM CDTTornado Warning Tornado observedConsiderable damage threatLSXMadison, Saint Francois27 min
Oct 24, 9:08 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Louis54 min
Oct 24, 9:11 PM CDTTornado WarningLSXIron, Madison49 min
Oct 24, 9:12 PM CDTFlash Flood WarningLSXIron, Madison4 hr
Oct 24, 9:37 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds36 min
Oct 24, 10:07 PM CDTSevere Thunderstorm WarningLSXIron, Reynolds38 min
Oct 24, 10:12 PM CDTFlash Flood WarningLSXMadison4 hr
Oct 24, 7:59 PM CDTRiver Flood WarningLSXBrown33 hr
Oct 24, 8:27 PM CDTSevere Thunderstorm WarningLSXMonroe, Randolph, Saint Clair48 min
Oct 24, 9:00 PM CDTTornado WarningLSXClinton, Randolph, Saint Clair, Washington45 min
Oct 24, 9:08 PM CDTTornado Warning Tornado observedConsiderable damage threatLSXRandolph40 min
Oct 24, 9:15 PM CDTTornado Warning EmergencyTornado observedCatastrophic damage threatLSXRandolph19 min
Oct 24, 9:33 PM CDTTornado WarningLSXSaint Clair30 min
Oct 24, 9:48 PM CDTTornado WarningLSXBond, Clinton, Madison42 min
Oct 24, 9:58 PM CDTTornado WarningLSXMarion, Washington16 min
Oct 24, 10:13 PM CDTSevere Thunderstorm WarningLSXClinton, Fayette, Marion62 min
Oct 24, 10:40 PM CDTSevere Thunderstorm WarningLSXFayette, Marion26 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2021Severe Thunderstorm Warnings in Illinois, 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.