Alert archive / Illinois / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 47, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 10, 2011, 11:35 PM CDT for 5 counties in Illinois. It was in force for 40 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 10, 2011, 11:35 PM CDT (04:35 UTC)
- Expired
- Apr 11, 2011, 12:15 AM CDT
- In force
- 40 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL
The radar
The St Louis radar (KLSX), 72 km from the middle of the area, began a volume at 04:36 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 10, 6:05 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.6 hours before the alert went out and 169 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
- 1523 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 1493 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 6.7
The text
As transmitted, in the capitals the NWS used until 2016.
264
WUUS53 KLSX 110435
SVRLSX
ILC061-083-117-119-135-110515-
/O.NEW.KLSX.SV.W.0047.110411T0435Z-110411T0515Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1135 PM CDT SUN APR 10 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
JERSEY COUNTY IN SOUTHWEST ILLINOIS...
MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
NORTHERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
WESTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...
* UNTIL 1215 AM CDT
* AT 1132 PM 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 5 MILES
SOUTH OF JERSEYVILLE...AND MOVING NORTHEAST AT 85 MPH.
* LOCATIONS IMPACTED INCLUDE...
BETHALTO...STAUNTON...GILLESPIE...CARLINVILLE...LITCHFIELD...
CARROLLTON...BRIGHTON...DORSEY...KEMPER...CARPENTER...
PRAIRIETOWN...SHIPMAN...GREENFIELD...BUNKER HILL...WORDEN...
WILSONVILLE...LIVINGSTON...BENLD...MOUNT OLIVE AND GIRARD.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
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 3889 8967 3889 9020 3892 9026 3892 9030
3897 9044 3929 9052 3953 8958 3953 8955
TIME...MOT...LOC 0435Z 237DEG 76KT 3908 9027
WIND...HAIL 60MPH 1.00IN
$$
GLASS2 follow-up statements
873 WWUS53 KLSX 110451 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1151 PM CDT SUN APR 10 2011 ILC061-083-110501- /O.CAN.KLSX.SV.W.0047.000000T0000Z-110411T0515Z/ JERSEY IL-GREENE IL- 1151 PM CDT SUN APR 10 2011 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GREENE AND JERSEY COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 3889 8967 3890 9014 3936 9015 3953 8955 TIME...MOT...LOC 0451Z 239DEG 64KT 3920 8998 $$ ILC117-119-135-110515- /O.CON.KLSX.SV.W.0047.000000T0000Z-110411T0515Z/ MONTGOMERY IL-MADISON IL-MACOUPIN IL- 1151 PM CDT SUN APR 10 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MACOUPIN... NORTHERN MADISON AND WESTERN MONTGOMERY COUNTIES UNTIL 1215 AM CDT... AT 1149 PM 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 SHIPMAN...OR 10 MILES SOUTHWEST OF CARLINVILLE...MOVING NORTHEAST AT 75 MPH. LOCATIONS IMPACTED INCLUDE... STAUNTON...GILLESPIE...CARLINVILLE...LITCHFIELD...WILSONVILLE... LIVINGSTON...BENLD...MOUNT OLIVE...GIRARD...FARMERSVILLE...WHITE OAK...WILLIAMSON...HETTICK...WHITE CITY...NEW DOUGLAS...HORNSBY... STANDARD CITY...NILWOOD...ATWATER AND HONEY BEND. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. 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 3889 8967 3890 9014 3936 9015 3953 8955 TIME...MOT...LOC 0451Z 239DEG 64KT 3920 8998 WIND...HAIL 60MPH 1.00IN $$ GLASS
121 WWUS53 KLSX 110512 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1212 AM CDT MON APR 11 2011 ILC117-119-135-110523- /O.EXP.KLSX.SV.W.0047.000000T0000Z-110411T0515Z/ MONTGOMERY IL-MADISON IL-MACOUPIN IL- 1212 AM CDT MON APR 11 2011 ...THE SEVERE THUNDERSTORM WARNING FOR MACOUPIN...NORTHERN MADISON AND WESTERN MONTGOMERY COUNTIES WILL EXPIRE AT 1215 AM CDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF THE WARNED AREA. ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM. LAT...LON 3889 8967 3890 9014 3936 9015 3953 8955 TIME...MOT...LOC 0513Z 239DEG 64KT 3940 8955 $$ GLASS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 8:33 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 42 min |
| Apr 10, 9:36 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 30 min |
| Apr 10, 10:57 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 48 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 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.