Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 368, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 20, 2011, 2:33 AM CDT for Knox County, Lewis 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
- Jun 20, 2011, 2:33 AM CDT (07:33 UTC)
- Expired
- Jun 20, 2011, 3:15 AM CDT
- In force
- 42 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Knox County, MO, Lewis County, MO
The radar
The Quad Cities radar (KDVN), 190 km from the middle of the area, began a volume at 07:35 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, 7.6 hours before the alert went out and 194 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
- 2723 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 881 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.0
The text
As transmitted, in the capitals the NWS used until 2016.
544
WUUS53 KLSX 200733
SVRLSX
MOC103-111-200815-
/O.NEW.KLSX.SV.W.0368.110620T0733Z-110620T0815Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
233 AM CDT MON JUN 20 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN KNOX COUNTY IN NORTHEAST MISSOURI...
NORTHWESTERN LEWIS COUNTY IN NORTHEAST MISSOURI...
* UNTIL 315 AM CDT
* AT 232 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 15 MILES NORTHEAST OF WYACONDA
TO 7 MILES SOUTHWEST OF GREENSBURG...AND MOVING EAST AT 40 MPH.
* LOCATIONS IMPACTED INCLUDE...
EDINA...GREENSBURG...COLONY...KNOX CITY...LA BELLE...LEWISTOWN...
HURDLAND...BARING AND MONTICELLO.
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 4026 9194 4025 9150 4020 9150
4017 9151 3997 9182 4015 9235 4030 9235
TIME...MOT...LOC 0733Z 276DEG 35KT 4057 9176 4025 9233
WIND...HAIL 60MPH 1.00IN
$$
TRUETT2 follow-up statements
759
WWUS53 KLSX 200757
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
257 AM CDT MON JUN 20 2011
MOC103-111-200815-
/O.CON.KLSX.SV.W.0368.000000T0000Z-110620T0815Z/
KNOX MO-LEWIS MO-
257 AM CDT MON JUN 20 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
LEWIS AND NORTHERN KNOX COUNTIES UNTIL 315 AM CDT...
AT 255 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 11 MILES NORTHWEST OF HAMILTON TO
EDINA...MOVING EAST AT 40 MPH.
LOCATIONS IMPACTED INCLUDE...
KNOX CITY...LA BELLE...LEWISTOWN AND MONTICELLO.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 4031 9195 4026 9194 4025 9150 4020 9150
4017 9151 3997 9182 4015 9235 4030 9235
TIME...MOT...LOC 0757Z 277DEG 37KT 4053 9143 4015 9209
WIND...HAIL 60MPH 1.00IN
$$
TRUETT002
WWUS53 KLSX 200817
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
317 AM CDT MON JUN 20 2011
MOC103-111-200826-
/O.EXP.KLSX.SV.W.0368.000000T0000Z-110620T0815Z/
KNOX MO-LEWIS MO-
317 AM CDT MON JUN 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LEWIS AND
NORTHERN KNOX COUNTIES HAS EXPIRED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY. HOWEVER SMALL HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS AS THEY PUSH INTO LEWIS COUNTY...AND THE
CANTON...LA GRANGE...LA BELLE...MONTICELLO...AND EWING AREAS BETWEEN
NOW AND 4 AM.
LAT...LON 4031 9195 4026 9194 4025 9150 4020 9150
4017 9151 3997 9182 4015 9235 4030 9235
TIME...MOT...LOC 0757Z 277DEG 37KT 4053 9143 4015 9209
$$
TRUETTNearby
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.