Alert archive / Illinois / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 470, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 24, 2011, 2:47 PM CDT for Randolph County, Illinois; Sainte Genevieve County, Missouri. It was in force for 43 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 24, 2011, 2:47 PM CDT (19:47 UTC)
- Expired
- Jul 24, 2011, 3:30 PM CDT
- In force
- 43 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
The radar
The St Louis radar (KLSX), 111 km from the middle of the area, began a volume at 19:49 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
Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 270 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
- 3589 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 977 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
284
WUUS53 KLSX 241947
SVRLSX
ILC157-MOC186-242030-
/O.NEW.KLSX.SV.W.0470.110724T1947Z-110724T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
247 PM CDT SUN JUL 24 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
NORTHERN STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI...
* UNTIL 330 PM CDT
* AT 245 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED NEAR BLOOMSDALE...OR 9 MILES
NORTHWEST OF STE. GENEVIEVE...AND MOVING SOUTHEAST AT 10 MPH.
ALSO...ANOTHER SEVERE THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST OF
EVANSVILLE...AND MOVING SOUTHEAST AT 10 MPH. PENNY SIZE HAIL MAY
ALSO ACCOMPANY THESE DAMAGING WINDS.
* LOCATIONS IMPACTED INCLUDE...
STE. GENEVIEVE...CHESTER...ROCKY RIDGE...ST. MARY...EVANSVILLE...
BREMEN...PRAIRIE DU ROCHER...RUMA...MODOC...KELLOGG...ROOTS...RIVER
AUX VASES...KASKASKIA...ELLIS GROVE...NEW PALESTINE...WELGE AND
ROCKWOOD.
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 3780 8968 3784 8974 3785 8979 3788 8981
3790 8985 3787 8990 3787 8994 3780 9002
3800 9035 3812 9009 3813 9004 3815 9003
3796 8959 3795 8959
TIME...MOT...LOC 1946Z 302DEG 9KT 3803 9019
WIND...HAIL 60MPH 0.75IN
$$
BYRD2 follow-up statements
228
WWUS53 KLSX 242010
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
310 PM CDT SUN JUL 24 2011
ILC157-MOC186-242030-
/O.CON.KLSX.SV.W.0470.000000T0000Z-110724T2030Z/
RANDOLPH IL-STE. GENEVIEVE MO-
310 PM CDT SUN JUL 24 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN STE.
GENEVIEVE AND SOUTHERN RANDOLPH COUNTIES UNTIL 330 PM CDT...
AT 307 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH. THIS STORM WAS LOCATED NEAR BLOOMSDALE...OR 5 MILES WEST OF
STE. GENEVIEVE...MOVING SOUTHEAST AT 10 MPH. PENNY SIZE HAIL MAY ALSO
ACCOMPANY THESE DAMAGING WINDS.
LOCATIONS IMPACTED INCLUDE...
STE. GENEVIEVE...CHESTER...ST. MARY...EVANSVILLE...BREMEN...
MODOC...KELLOGG...RIVER AUX VASES...ROOTS...KASKASKIA...ELLIS
GROVE...NEW PALESTINE...WELGE AND ROCKWOOD.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 3780 8968 3784 8974 3785 8979 3788 8981
3790 8985 3787 8990 3787 8994 3780 9002
3798 9032 3813 8997 3796 8959 3795 8959
TIME...MOT...LOC 2008Z 304DEG 9KT 3800 9014
WIND...HAIL 60MPH 0.75IN
$$
BYRD359
WWUS53 KLSX 242029
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
329 PM CDT SUN JUL 24 2011
ILC157-MOC186-242039-
/O.EXP.KLSX.SV.W.0470.000000T0000Z-110724T2030Z/
RANDOLPH IL-STE. GENEVIEVE MO-
329 PM CDT SUN JUL 24 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN STE. GENEVIEVE AND
SOUTHERN RANDOLPH COUNTIES WILL EXPIRE AT 330 PM CDT...
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THESE THUNDERSTORMS.
LAT...LON 3780 8968 3784 8974 3785 8979 3788 8981
3790 8985 3787 8990 3787 8994 3780 9002
3798 9032 3813 8997 3796 8959 3795 8959
TIME...MOT...LOC 2029Z 304DEG 9KT 3797 9008
$$
BYRDThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 12:21 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Montgomery | 24 min |
| Jul 24, 1:50 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 25 min |
| Jul 24, 3:09 PM CDT | Flash Flood Warning | LSX | Randolph | 5 hr |
| Jul 24, 4:00 PM CDT | Excessive Heat Watch | LSX | Adams, Bond, Brown, Clinton, Fayette, Greene and 5 more | 24 hr |
| Jul 24, 3:44 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve, Saint Francois | 46 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2011Severe 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.