Alert archive / Missouri / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 33, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2011, 5:04 AM CDT for 4 counties in Missouri. It was in force for 41 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
- Apr 9, 2011, 5:04 AM CDT (10:04 UTC)
- Expired
- Apr 9, 2011, 5:45 AM CDT
- In force
- 41 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), 121 km from the middle of the area, began a volume at 10:07 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 00:00Z, 10.1 hours before the alert went out and 284 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
- 1288 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 2309 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.2
The text
As transmitted, in the capitals the NWS used until 2016.
633 WUUS53 KLSX 091004 SVRLSX MOC093-123-179-187-091045- /O.NEW.KLSX.SV.W.0033.110409T1004Z-110409T1045Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 504 AM CDT SAT APR 9 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... IRON COUNTY IN SOUTHEAST MISSOURI... NORTHWESTERN MADISON COUNTY IN SOUTHEAST MISSOURI... NORTHEASTERN REYNOLDS COUNTY IN SOUTHEAST MISSOURI... SOUTHERN ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI... * UNTIL 545 AM CDT * AT 503 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR OATES...OR 21 MILES WEST OF IRONTON...AND MOVING EAST AT 45 MPH. * LOCATIONS IMPACTED INCLUDE... IRONTON...GLOVER...PILOT KNOB...IRON MOUNTAIN...ARCADIA... ROSELLE...BLACK...HOGAN AND GRANITE. 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 3773 9050 3746 9047 3750 9106 3763 9107 TIME...MOT...LOC 1005Z 267DEG 40KT 3756 9098 WIND...HAIL 60MPH 1.00IN $$ TES
2 follow-up statements
888
WWUS53 KLSX 091027
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
527 AM CDT SAT APR 9 2011
MOC179-091037-
/O.CAN.KLSX.SV.W.0033.000000T0000Z-110409T1045Z/
REYNOLDS MO-
527 AM CDT SAT APR 9 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN REYNOLDS COUNTY
IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3757 9078 3760 9078 3760 9083 3767 9087
3773 9050 3753 9048
TIME...MOT...LOC 1027Z 257DEG 37KT 3764 9070
$$
MOC093-123-187-091045-
/O.CON.KLSX.SV.W.0033.000000T0000Z-110409T1045Z/
MADISON MO-IRON MO-ST. FRANCOIS MO-
527 AM CDT SAT APR 9 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ST.
FRANCOIS...IRON AND NORTHWESTERN MADISON COUNTIES UNTIL 545 AM CDT...
AT 526 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
BELLEVIEW...OR 5 MILES NORTHWEST OF IRONTON...MOVING EAST AT 40 MPH.
LOCATIONS IMPACTED INCLUDE...
IRONTON...PILOT KNOB...ARCADIA...IRON MOUNTAIN...ROSELLE AND
GRANITE.
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 3757 9078 3760 9078 3760 9083 3767 9087
3773 9050 3753 9048
TIME...MOT...LOC 1027Z 257DEG 37KT 3764 9070
WIND...HAIL 60MPH 1.00IN
$$
TES858
WWUS53 KLSX 091044
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
544 AM CDT SAT APR 9 2011
MOC093-123-187-091054-
/O.EXP.KLSX.SV.W.0033.000000T0000Z-110409T1045Z/
MADISON MO-IRON MO-ST. FRANCOIS MO-
544 AM CDT SAT APR 9 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. FRANCOIS...IRON
AND NORTHWESTERN MADISON COUNTIES WILL EXPIRE AT 545 AM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
LAT...LON 3757 9078 3760 9078 3760 9083 3767 9087
3773 9050 3753 9048
TIME...MOT...LOC 1044Z 257DEG 37KT 3768 9048
$$
TESThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 1:42 AM CDT | Flash Flood Warning | LSX | Marion, Shelby | 6 hr |
| Apr 9, 2:46 AM CDT | Flash Flood Warning | LSX | Marion | 6 hr |
| Apr 9, 3:00 AM CDT | Severe Thunderstorm Warning | LSX | Marion, Ralls | 33 min |
| Apr 9, 3:44 AM CDT | Severe Thunderstorm Warning | LSX | Pike | 31 min |
| Apr 9, 5:08 AM CDT | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis | 22 min |
| Apr 9, 5:44 AM CDT | Areal Flood Advisory | LSX | Lincoln, Saint Charles, Saint Louis, City of Saint Louis | 3 hr |
| Apr 9, 10:42 AM CDT | River Flood Warning | LSX | Marion | 32 days |
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.