Alert archive / Missouri / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 149, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 23, 2021, 3:05 PM CDT for Saint Charles County, Missouri. It was in force for 25 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
- Aug 23, 2021, 3:05 PM CDT (20:05 UTC)
- Expired
- Aug 23, 2021, 3:30 PM CDT
- In force
- 25 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Saint Charles County, MO
The radar
The St Louis radar (KLSX), 27 km from the middle of the area, began a volume at 20:08 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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.1 hours before the alert went out and 268 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1261 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
636
WUUS53 KLSX 232005
SVRLSX
MOC183-232030-
/O.NEW.KLSX.SV.W.0149.210823T2005Z-210823T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
305 PM CDT Mon Aug 23 2021
The National Weather Service in St Louis has issued a
* Severe Thunderstorm Warning for...
Southwestern St. Charles County in east central Missouri...
* Until 330 PM CDT.
* At 304 PM CDT, a severe thunderstorm was located over Augusta, and
is nearly stationary.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Augusta.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 3861 9096 3856 9085 3853 9091 3853 9093
3854 9096 3855 9097 3856 9097
TIME...MOT...LOC 2004Z 240DEG 4KT 3857 9093
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Byrd1 follow-up statement
059
WWUS53 KLSX 232026
SVSLSX
Severe Weather Statement
National Weather Service St Louis MO
326 PM CDT Mon Aug 23 2021
MOC183-232036-
/O.EXP.KLSX.SV.W.0149.000000T0000Z-210823T2030Z/
St. Charles MO-
326 PM CDT Mon Aug 23 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ST. CHARLES
COUNTY WILL EXPIRE AT 330 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 3861 9096 3856 9085 3853 9091 3853 9093
3854 9096 3855 9097 3856 9097
TIME...MOT...LOC 2026Z 240DEG 4KT 3858 9090
$$
ByrdThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 3:33 PM CDT | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 27 min |
| Aug 23, 4:01 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 17 min |
| Aug 23, 6:04 PM CDT | Areal Flood Advisory | LSX | Sainte Genevieve | 3 hr |
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.