Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 23, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 7, 2021, 4:04 PM CDT for 5 counties in Missouri. It was in force for 26 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
- Apr 7, 2021, 4:04 PM CDT (21:04 UTC)
- Expired
- Apr 7, 2021, 4:30 PM CDT
- In force
- 26 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Boone County, MO, Callaway County, MO, Cole County, MO, Moniteau County, MO, Osage County, MO
The radar
The St Louis radar (KLSX), 141 km from the middle of the area, began a volume at 21:05 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 |
|---|---|---|---|
| Apr 7, 12:02 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 9.1 hours before the alert went out and 218 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
- 790 J/kg
- Mixed-layer CIN
- -275 J/kg
- Mixed-layer LCL
- 767 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
329
WUUS53 KLSX 072104
SVRLSX
MOC019-027-051-135-151-072130-
/O.NEW.KLSX.SV.W.0023.210407T2104Z-210407T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
404 PM CDT Wed Apr 7 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Cole County in central Missouri...
Southeastern Boone County in central Missouri...
Southwestern Callaway County in central Missouri...
Southwestern Osage County in central Missouri...
Southeastern Moniteau County in central Missouri...
* Until 430 PM CDT.
* At 404 PM CDT, severe thunderstorms were located along a line
extending from near Russellville to 7 miles southwest of St.
Thomas, moving north at 70 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Jefferson City, Ashland, Holts Summit, Columbia Regional Airport,
Wardsville, St. Martins, Taos, Russellville, New Bloomfield, Lake
Mykee Town, Centertown, St. Thomas, Easley, McGirk, Hickory Hill,
Brazito, Lake Mykee, Marion, Meta and Lohman.
This also includes Clarks Hill/Norton Historic Site and Jefferson
Landing Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3885 9238 3868 9189 3829 9213 3829 9219
3834 9220 3834 9222 3832 9224 3832 9226
3834 9229 3834 9241 3843 9241 3843 9258
TIME...MOT...LOC 2104Z 192DEG 61KT 3851 9247 3828 9229
HAIL...0.88IN
WIND...60MPH
$$
MRM3 follow-up statements
086
WWUS53 KLSX 072114
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
414 PM CDT Wed Apr 7 2021
MOC019-027-051-135-151-072130-
/O.CON.KLSX.SV.W.0023.000000T0000Z-210407T2130Z/
Cole MO-Boone MO-Callaway MO-Osage MO-Moniteau MO-
414 PM CDT Wed Apr 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR COLE...SOUTHEASTERN BOONE...SOUTHWESTERN CALLAWAY...SOUTHWESTERN
OSAGE AND SOUTHEASTERN MONITEAU COUNTIES...
At 414 PM CDT, severe thunderstorms were located along a line
extending from near Centertown to near St. Thomas, moving east at 70
mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jefferson City, Ashland, Holts Summit, Columbia Regional Airport,
Wardsville, St. Martins, Taos, Russellville, New Bloomfield, Lake
Mykee Town, Centertown, St. Thomas, Easley, McGirk, Hickory Hill,
Brazito, Lake Mykee, Marion, Meta and Lohman.
This also includes Clarks Hill/Norton Historic Site and Jefferson
Landing Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3885 9238 3868 9189 3829 9213 3829 9219
3834 9220 3834 9222 3832 9224 3832 9226
3834 9229 3834 9241 3843 9241 3843 9258
TIME...MOT...LOC 2114Z 270DEG 61KT 3865 9240 3842 9222
HAIL...0.88IN
WIND...60MPH
$$
MRM716
WWUS53 KLSX 072122
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
422 PM CDT Wed Apr 7 2021
MOC019-027-051-135-151-072130-
/O.CON.KLSX.SV.W.0023.000000T0000Z-210407T2130Z/
Cole MO-Boone MO-Callaway MO-Osage MO-Moniteau MO-
422 PM CDT Wed Apr 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR COLE...SOUTHEASTERN BOONE...SOUTHWESTERN CALLAWAY...SOUTHWESTERN
OSAGE AND SOUTHEASTERN MONITEAU COUNTIES...
At 422 PM CDT, a severe thunderstorm was located over St. Thomas,
moving north at 75 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jefferson City, Ashland, Holts Summit, Columbia Regional Airport,
Wardsville, St. Martins, Taos, Russellville, New Bloomfield, Lake
Mykee Town, Centertown, St. Thomas, Easley, McGirk, Hickory Hill,
Brazito, Lake Mykee, Marion, Meta and Lohman.
This also includes Clarks Hill/Norton Historic Site and Jefferson
Landing Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3885 9238 3868 9189 3829 9213 3829 9219
3834 9220 3834 9222 3832 9224 3832 9226
3834 9229 3834 9241 3843 9241 3843 9258
TIME...MOT...LOC 2122Z 198DEG 65KT 3840 9219
TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
$$
MRM946
WWUS53 KLSX 072131
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
431 PM CDT Wed Apr 7 2021
MOC019-027-051-135-151-072141-
/O.EXP.KLSX.SV.W.0023.000000T0000Z-210407T2130Z/
Cole MO-Boone MO-Callaway MO-Osage MO-Moniteau MO-
431 PM CDT Wed Apr 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR COLE...SOUTHEASTERN BOONE...
SOUTHWESTERN CALLAWAY...SOUTHWESTERN OSAGE AND SOUTHEASTERN MONITEAU
COUNTIES HAS EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
central Missouri.
LAT...LON 3885 9238 3868 9189 3829 9213 3829 9219
3834 9220 3834 9222 3832 9224 3832 9226
3834 9229 3834 9241 3843 9241 3843 9258
TIME...MOT...LOC 2131Z 192DEG 61KT 3854 9215
$$
MRMThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 3:06 PM CDT | Severe Thunderstorm Warning | LSX | Moniteau | 39 min |
| Apr 7, 4:27 PM CDT | Areal Flood Advisory | LSX | Boone, Cole, Moniteau | 3 hr |
| Apr 7, 5:09 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis, Marion, Monroe, Ralls, Shelby | 19 min |
| Apr 7, 5:37 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Francois, Washington | 68 min |
| Apr 7, 6:27 PM CDT | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 49 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.