Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 491, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 12, 2011, 5:22 PM CDT for 4 counties in Missouri. It was in force for 38 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 12, 2011, 5:22 PM CDT (22:22 UTC)
- Expired
- Aug 12, 2011, 6:00 PM CDT
- In force
- 38 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Iron County, MO, Madison County, MO, Reynolds County, MO, Saint Francois County, MO
The radar
The St Louis radar (KLSX), 162 km from the middle of the area, began a volume at 22:23 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
Springfield, MO (KSGF), launched 12:00Z, 10.4 hours before the alert went out and 265 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
- 196 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 1165 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 146 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
645
WUUS53 KLSX 122222
SVRLSX
MOC093-123-179-187-122300-
/O.NEW.KLSX.SV.W.0491.110812T2222Z-110812T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
522 PM CDT FRI AUG 12 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
IRON COUNTY IN SOUTHEAST MISSOURI...
MADISON COUNTY IN SOUTHEAST MISSOURI...
REYNOLDS COUNTY IN SOUTHEAST MISSOURI...
SOUTHERN ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...
* UNTIL 600 PM CDT
* AT 519 PM 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 7 MILES WEST OF BELLEVIEW TO 5
MILES EAST OF REYNOLDS TO 7 MILES NORTHWEST OF EMINENCE...AND
MOVING EAST AT 30 MPH.
* LOCATIONS IMPACTED INCLUDE...
IRONTON...FREDERICKTOWN...BELLEVIEW...IRON MOUNTAIN...PILOT KNOB...
GLOVER...ARCADIA...ELLINGTON...ANNAPOLIS...ROSELLE...SACO...
GARWOOD...JUNCTION CITY...BUCKHORN...MARQUAND...LESTERVILLE...
REDFORD...GRANITE...HOGAN AND CHLORIDE.
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 3705 9096 3709 9097 3709 9101 3716 9104
3720 9109 3720 9113 3725 9113 3726 9117
3738 9118 3740 9109 3773 9085 3763 9016
3731 9016 3731 9054 3727 9055 3727 9073
3717 9073 3713 9077 3705 9077
TIME...MOT...LOC 2222Z 288DEG 25KT 3768 9085 3737 9096
3724 9138
WIND...HAIL 60MPH 1.00IN
$$
GKS2 follow-up statements
074
WWUS53 KLSX 122251
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
551 PM CDT FRI AUG 12 2011
MOC187-122300-
/O.CAN.KLSX.SV.W.0491.000000T0000Z-110812T2300Z/
ST. FRANCOIS MO-
551 PM CDT FRI AUG 12 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. FRANCOIS COUNTY
IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA.
LAT...LON 3705 9096 3709 9097 3709 9101 3716 9104
3720 9109 3720 9113 3725 9113 3726 9117
3735 9112 3740 9107 3765 9079 3763 9016
3731 9016 3731 9054 3727 9055 3727 9073
3717 9073 3713 9077 3705 9077
TIME...MOT...LOC 2250Z 288DEG 25KT 3762 9046 3729 9068
3713 9098
$$
MOC093-123-179-122300-
/O.CON.KLSX.SV.W.0491.000000T0000Z-110812T2300Z/
IRON MO-MADISON MO-REYNOLDS MO-
551 PM CDT FRI AUG 12 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR REYNOLDS...
MADISON AND IRON COUNTIES UNTIL 600 PM CDT...
AT 545 PM 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 ROSELLE TO ANNAPOLIS TO 7 MILES
SOUTHWEST OF ELLINGTON...MOVING EAST AT 30 MPH.
LOCATIONS IMPACTED INCLUDE...
FREDERICKTOWN...GARWOOD...SACO...JUNCTION CITY...BUCKHORN...
MARQUAND...DES ARC...CATHERINE PLACE AND MINE LA MOTTE.
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 3705 9096 3709 9097 3709 9101 3716 9104
3720 9109 3720 9113 3725 9113 3726 9117
3735 9112 3740 9107 3765 9079 3763 9016
3731 9016 3731 9054 3727 9055 3727 9073
3717 9073 3713 9077 3705 9077
TIME...MOT...LOC 2250Z 288DEG 25KT 3762 9046 3729 9068
3713 9098
WIND...HAIL 60MPH 1.00IN
$$
GKS280
WWUS53 KLSX 122304
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
604 PM CDT FRI AUG 12 2011
MOC093-123-179-122313-
/O.EXP.KLSX.SV.W.0491.000000T0000Z-110812T2300Z/
IRON MO-MADISON MO-REYNOLDS MO-
604 PM CDT FRI AUG 12 2011
...THE SEVERE THUNDERSTORM WARNING FOR REYNOLDS...MADISON AND IRON
COUNTIES HAS EXPIRED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY. HOWEVER SMALL HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL
POSSIBLE WITH THESE THUNDERSTORMS FOR ANOTHER 30 MINUTES.
LAT...LON 3705 9096 3709 9097 3709 9101 3716 9104
3720 9109 3720 9113 3725 9113 3726 9117
3735 9112 3740 9107 3765 9079 3763 9016
3731 9016 3731 9054 3727 9055 3727 9073
3717 9073 3713 9077 3705 9077
TIME...MOT...LOC 2251Z 288DEG 25KT 3762 9045 3729 9067
3713 9097
$$
GKSThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 4:44 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Iron, Jefferson, Madison, Reynolds, Sainte Genevieve and 2 more | 46 min |
| Aug 12, 5:25 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 50 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.