Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 86, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2021, 10:42 PM CDT for 4 counties in Missouri. It was in force for 48 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 20, 2021, 10:42 PM CDT (03:42 UTC)
- Expired
- Jun 20, 2021, 11:30 PM CDT
- In force
- 48 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Boone County, MO, Callaway County, MO, Cole County, MO, Moniteau County, MO
The radar
The St Louis radar (KLSX), 122 km from the middle of the area, began a volume at 03:45 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 20, 11:04 PM CDT | TSTM WND GST 58 | 3 Ne Ashland, MO | 58 MPH MEASURED GUST AT COLUMBIA AIRPORT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 20, 8:10 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 3.7 hours before the alert went out and 245 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
- 1346 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 1683 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 264 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 5.8
The text
As transmitted.
190
WUUS53 KLSX 210342
SVRLSX
MOC019-027-051-135-210430-
/O.NEW.KLSX.SV.W.0086.210621T0342Z-210621T0430Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
1042 PM CDT Sun Jun 20 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Northern Cole County in central Missouri...
Southern Boone County in central Missouri...
Southwestern Callaway County in central Missouri...
Northeastern Moniteau County in central Missouri...
* Until 1130 PM CDT.
* At 1041 PM CDT, severe thunderstorms were located along a line
extending from near Columbia to near Tipton, moving east at 55 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
* Severe thunderstorms will be near...
Easley around 1045 PM CDT.
Ashland and Columbia Regional Airport around 1050 PM CDT.
Jamestown around 1055 PM CDT.
Centertown around 1100 PM CDT.
Other locations in the path of these severe thunderstorms include St.
Martins, Jefferson City, Holts Summit, Lake Mykee Town, New
Bloomfield and Lake Mykee.
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 3868 9262 3892 9250 3873 9180 3867 9185
3866 9188 3862 9191 3859 9195 3858 9199
3857 9201 3856 9200 3855 9202 3853 9203
3851 9202
TIME...MOT...LOC 0341Z 279DEG 50KT 3890 9239 3872 9274
TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
$$
191 follow-up statement
379
WWUS53 KLSX 210413
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
1113 PM CDT Sun Jun 20 2021
MOC019-027-051-135-210430-
/O.CON.KLSX.SV.W.0086.000000T0000Z-210621T0430Z/
Cole MO-Boone MO-Callaway MO-Moniteau MO-
1113 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR NORTHERN COLE...SOUTHERN BOONE...SOUTHWESTERN CALLAWAY AND
NORTHEASTERN MONITEAU COUNTIES...
At 1111 PM CDT, severe thunderstorms were located along a line
extending from near Fulton to near St. Martins, moving east at 60
mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Lake Mykee Town and Lake Mykee.
This also includes Clarks Hill/Norton Historic Site and Jefferson
Landing Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3868 9262 3892 9250 3873 9180 3867 9185
3866 9188 3862 9191 3859 9195 3858 9199
3857 9201 3856 9200 3855 9202 3853 9203
3851 9202
TIME...MOT...LOC 0411Z 284DEG 53KT 3878 9192 3860 9227
HAIL...1.00IN
WIND...70MPH
$$
19The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:41 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis, Shelby | 49 min |
| Jun 20, 9:07 PM CDT | Tornado Warning | LSX | Marion, Shelby | 38 min |
| Jun 20, 9:17 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis, Marion, Monroe, Ralls, Shelby | 43 min |
| Jun 20, 9:42 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Monroe | 48 min |
| Jun 20, 9:59 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Monroe, Pike, Ralls | 46 min |
| Jun 20, 10:10 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Monroe, Montgomery, Pike, Ralls | 50 min |
| Jun 20, 10:22 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Callaway | 38 min |
| Jun 20, 10:27 PM CDT | Areal Flood Advisory | LSX | Audrain, Boone, Monroe | 3 hr |
| Jun 20, 10:55 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Boone, Callaway, Montgomery | 35 min |
| Jun 20, 11:29 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway, Cole, Franklin, Gasconade, Lincoln and 3 more | 31 min |
| Jun 20, 11:41 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles | 19 min |
| Jun 20, 11:59 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Montgomery, Osage, Warren | 31 min |
| Jun 21, 12:34 AM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway, Cole, Moniteau | 26 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.