Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 188, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Dec 10, 2021, 8:29 PM CST for 4 counties in Missouri. It was in force for 30 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, 8:29 PM CST (02:29 UTC)
- Expired
- Dec 10, 2021, 8:59 PM CST
- In force
- 30 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 29 km from the middle of the area, began a volume at 02:33 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Dec 10, 3:07 PM CST | Tornado Watch | SPC | 11 hr |
| Dec 10, 5:17 PM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 2.5 hours before the alert went out and 246 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
- 119 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 662 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 341 m²/s²
- 0-3 km storm-relative helicity
- 357 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
763 WUUS53 KLSX 110229 SVRLSX MOC071-099-189-510-110315- /O.NEW.KLSX.SV.W.0188.211211T0229Z-211211T0315Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service St Louis MO 829 PM CST Fri Dec 10 2021 The National Weather Service in St Louis has issued a * Severe Thunderstorm Warning for... Western St. Louis City in east central Missouri... Northern Jefferson County in east central Missouri... East central Franklin County in east central Missouri... St. Louis County in east central Missouri... * Until 915 PM CST. * At 828 PM CST, severe thunderstorms were located along a line extending from Wildwood to near Pacific, moving northeast at 60 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Severe thunderstorms will be near... Ballwin, Manchester, Ellisville, Clarkson Valley and Winchester around 835 PM CST. Chesterfield, Town and Country, Des Peres, Frontenac, Murphy, Crystal Lake Park, Westwood and Country Life Acres around 840 PM CST. University City, Kirkwood, Maryland Heights, Arnold, Creve Coeur, Overland, St. Ann, Ladue, Sunset Hills and Olivette around 845 PM CST. Other locations in the path of these severe thunderstorms include Webster Groves, Ferguson, Jennings, Crestwood, Berkeley, Richmond Heights, Brentwood, St. John, Shrewsbury, Glendale, Clayton, Bellefontaine Neighbors, Maplewood, Dellwood, Riverview, Spanish Lake, Pagedale, Moline Acres, Wellston, Castle Point and St. Louis. This includes the following highways... Interstate 44 in Missouri between exits 257 and 277. Interstate 55 in Missouri between exits 187 and 191. This also includes Route 66 State Park, Castlewood State Park, and Mastodon Historic Site. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 1100 PM CST for east central Missouri. A Tornado Watch also remains in effect until 1100 PM CST for east central 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 1100 PM CST for east central Missouri. A Tornado Watch also remains in effect until 1100 PM CST for east central Missouri. && LAT...LON 3835 9037 3835 9077 3860 9075 3878 9020 TIME...MOT...LOC 0228Z 238DEG 53KT 3859 9066 3843 9069 TORNADO...POSSIBLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Britt
2 follow-up statements
131 WWUS53 KLSX 110242 SVSLSX Severe Weather Statement National Weather Service St Louis MO 842 PM CST Fri Dec 10 2021 MOC071-110252- /O.CAN.KLSX.SV.W.0188.000000T0000Z-211211T0315Z/ Franklin MO- 842 PM CST Fri Dec 10 2021 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL FRANKLIN COUNTY IS CANCELLED... The storms which prompted the warning have moved out of the warned area. Therefore, the warning has been cancelled. A Tornado Watch remains in effect until 1100 PM CST for east central Missouri. A Tornado Watch also remains in effect until 1100 PM CST for east central Missouri. LAT...LON 3840 9035 3844 9060 3865 9061 3878 9020 TIME...MOT...LOC 0242Z 239DEG 49KT 3865 9050 3850 9049 $$ MOC099-189-510-110315- /O.CON.KLSX.SV.W.0188.000000T0000Z-211211T0315Z/ St. Louis City MO-Jefferson MO-St. Louis MO- 842 PM CST Fri Dec 10 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CST FOR NORTHEASTERN JEFFERSON AND CENTRAL ST. LOUIS COUNTIES AND WESTERN ST. LOUIS CITY... At 842 PM CST, severe thunderstorms were located along a line extending from near Town and Country to Murphy, moving northeast at 55 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe storms will be near... Maryland Heights, Ladue, Des Peres, Frontenac, Crystal Lake Park, Huntleigh, Westwood and Country Life Acres around 845 PM CST. Other locations in the path of these severe thunderstorms include University City, Kirkwood, Creve Coeur, Overland, Clayton, St. Ann, Crestwood, Sunset Hills, Olivette, St. John, Webster Groves, Ferguson, Jennings, Berkeley, Richmond Heights, Brentwood, Maplewood, Shrewsbury, Dellwood, Normandy, Bellefontaine Neighbors, Riverview, Spanish Lake, Moline Acres, Castle Point, Glasgow Village and St. Louis. This also includes Route 66 State Park and Castlewood State Park. This includes the following highways... Interstate 44 in Missouri between exits 266 and 277. Interstate 55 in Missouri between exits 190 and 191. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Tornado Watch remains in effect until 1100 PM CST for east central Missouri. A Tornado Watch also remains in effect until 1100 PM CST for east central 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. && LAT...LON 3840 9035 3844 9060 3865 9061 3878 9020 TIME...MOT...LOC 0242Z 239DEG 49KT 3865 9050 3850 9049 TORNADO...POSSIBLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Britt
931
WWUS53 KLSX 110259
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
859 PM CST Fri Dec 10 2021
MOC099-189-510-110308-
/O.CAN.KLSX.SV.W.0188.000000T0000Z-211211T0315Z/
St. Louis City MO-Jefferson MO-St. Louis MO-
859 PM CST Fri Dec 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JEFFERSON AND
CENTRAL ST. LOUIS COUNTIES AND WESTERN ST. LOUIS CITY IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1100 PM CST for east central
Missouri. A Tornado Watch also remains in effect until 1100 PM CST
for east central Missouri.
LAT...LON 3840 9035 3844 9060 3865 9061 3878 9020
TIME...MOT...LOC 0257Z 238DEG 53KT 3877 9025 3862 9024
$$
BrittThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 6:13 PM CST | Severe Thunderstorm Warning | LSX | Boone, Callaway, Cole, Moniteau | 47 min |
| Dec 10, 6:18 PM CST | Severe Thunderstorm Warning | LSX | Cole, Osage | 42 min |
| Dec 10, 6:27 PM CST | Tornado Warning | LSX | Audrain, Callaway | 34 min |
| Dec 10, 6:30 PM CST | Tornado Warning | LSX | Callaway, Cole, Gasconade, Montgomery, Osage | 45 min |
| Dec 10, 6:42 PM CST | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade, Osage | 48 min |
| Dec 10, 6:42 PM CST | Tornado Warning | LSX | Pike | 48 min |
| Dec 10, 6:49 PM CST | Tornado Warning | LSX | Franklin, Gasconade, Osage, Warren | 41 min |
| Dec 10, 6:50 PM CST | Tornado Warning | LSX | Audrain, Callaway, Montgomery, Pike, Ralls | 40 min |
| Dec 10, 7:00 PM CST | Tornado Warning | LSX | Gasconade, Lincoln, Montgomery, Pike, Warren | 45 min |
| Dec 10, 7:02 PM CST | Tornado Warning | LSX | Crawford, Franklin, Gasconade | 43 min |
| Dec 10, 7:11 PM CST | Tornado Warning | LSX | Lincoln, Montgomery, Pike | 49 min |
| Dec 10, 7:16 PM CST | Tornado Warning | LSX | Franklin, Lincoln, Saint Charles, Warren | 44 min |
| Dec 10, 7:30 PM CST | Tornado Warning | LSX | Lincoln | 45 min |
| Dec 10, 7:35 PM CST | Tornado Warning | LSX | Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren | 40 min |
| Dec 10, 7:49 PM CST | Severe Thunderstorm Warning | LSX | Crawford, Washington | 26 min |
| Dec 10, 8:06 PM CST | Tornado Warning | LSX | Saint Charles, Saint Louis, City of Saint Louis | 39 min |
| Dec 10, 8:10 PM CST | Severe Thunderstorm Warning | LSX | Franklin | 35 min |
| Dec 10, 8:34 PM CST | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade, Osage | 41 min |
| Dec 10, 8:47 PM CST | Tornado Warning | LSX | Franklin, Gasconade, Warren | 43 min |
| Dec 10, 9:07 PM CST | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more | 38 min |
| Dec 10, 9:39 PM CST | Tornado Warning | LSX | Saint Charles, Saint Louis | 51 min |
| Dec 10, 10:00 PM CST | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 45 min |
| Dec 10, 10:05 PM CST | Severe Thunderstorm Warning | LSX | City of Saint Louis | 25 min |
| Dec 10, 10:14 PM CST | Tornado Warning | LSX | Iron, Madison, Reynolds | 46 min |
| Dec 10, 10:19 PM CST | Severe Thunderstorm Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois | 41 min |
| Dec 10, 10:26 PM CST | Severe Thunderstorm Warning | LSX | Reynolds | 20 min |
| Dec 10, 10:55 PM CST | Severe Thunderstorm Warning | LSX | Madison | 18 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; radar from the NEXRAD Level II archive.