Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 474, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 29, 2011, 2:48 AM CDT for Knox County, Missouri. It was in force for 42 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
- Jul 29, 2011, 2:48 AM CDT (07:48 UTC)
- Expired
- Jul 29, 2011, 3:30 AM CDT
- In force
- 42 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Knox County, MO
The radar
The Quad Cities radar (KDVN), 202 km from the middle of the area, began a volume at 07:49 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
Davenport, (KDVN), launched 00:00Z, 7.8 hours before the alert went out and 207 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
- 4421 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 764 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.8
The text
As transmitted, in the capitals the NWS used until 2016.
970
WUUS53 KLSX 290748
SVRLSX
MOC103-290830-
/O.NEW.KLSX.SV.W.0474.110729T0748Z-110729T0830Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
248 AM CDT FRI JUL 29 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN KNOX COUNTY IN NORTHEAST MISSOURI...
* UNTIL 330 AM CDT
* AT 246 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED 5 MILES NORTH OF BRASHEAR...OR 9
MILES EAST OF KIRKSVILLE...AND MOVING NORTHEAST AT 10 MPH. PENNY
SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.
* LOCATIONS IMPACTED INCLUDE...
EDINA...GREENSBURG...COLONY...HURDLAND AND BARING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 4031 9195 4030 9195 4023 9195 4002 9234
4004 9235 4025 9236 4031 9234 4031 9211
TIME...MOT...LOC 0747Z 228DEG 9KT 4022 9241
WIND...HAIL 60MPH 0.75IN
$$
BYRD2 follow-up statements
997
WWUS53 KLSX 290810
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
310 AM CDT FRI JUL 29 2011
MOC103-290830-
/O.CON.KLSX.SV.W.0474.000000T0000Z-110729T0830Z/
KNOX MO-
310 AM CDT FRI JUL 29 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN KNOX
COUNTY UNTIL 330 AM CDT...
AT 304 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH. THIS STORM WAS LOCATED 6 MILES NORTH OF BRASHEAR...OR 11
MILES EAST OF KIRKSVILLE...MOVING NORTHEAST AT 10 MPH. PENNY SIZE
HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS. ANOTHER SEVERE STORM
WAS OVER GREENSBURG AND MOVING NORTHEAST AT 10 MPH.
LOCATIONS IMPACTED INCLUDE...
BARING AND GREENSBURG.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 4031 9195 4030 9195 4023 9195 4002 9234
4004 9235 4025 9236 4031 9234 4031 9211
TIME...MOT...LOC 0808Z 228DEG 9KT 4025 9236
WIND...HAIL 60MPH 0.75IN
$$
BYRD526
WWUS53 KLSX 290828
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
328 AM CDT FRI JUL 29 2011
MOC103-290838-
/O.EXP.KLSX.SV.W.0474.000000T0000Z-110729T0830Z/
KNOX MO-
328 AM CDT FRI JUL 29 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN KNOX COUNTY WILL
EXPIRE AT 330 AM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED. HOWEVER SMALL
HAIL...GUSTY WINDS TO 40 MPH AND HEAVY RAIN ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.
LAT...LON 4031 9195 4030 9195 4023 9195 4002 9234
4004 9235 4025 9236 4031 9234 4031 9211
TIME...MOT...LOC 0828Z 228DEG 9KT 4028 9231
$$
BYRDThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 9:26 PM CDT | River Flood Warning | LSX | Perry, Sainte Genevieve | 10 days |
| Jul 28, 10:51 PM CDT | Severe Thunderstorm Warning | LSX | Lewis, Marion, Shelby | 39 min |
| Jul 28, 11:14 PM CDT | Severe Thunderstorm Warning | LSX | Lewis | 33 min |
| Jul 29, 3:00 AM CDT | Excessive Heat Watch | LSX | Audrain, Knox, Lewis, Marion, Monroe, Pike and 2 more | 37 hr |
| Jul 29, 5:55 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 35 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2011Every severe thunderstorm warning in 2011
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.