Alert archive / Illinois / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 34, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2011, 5:08 AM CDT for Jersey County, Madison County, Illinois; Saint Charles County, Saint Louis County, Missouri. It was in force for 22 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, 5:08 AM CDT (10:08 UTC)
- Expired
- Apr 9, 2011, 5:30 AM CDT
- In force
- 22 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Jersey County, IL, Madison County, IL, Saint Charles County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 32 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
Lincoln, IL (KILX), launched 00:00Z, 10.1 hours before the alert went out and 209 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 242 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
040
WUUS53 KLSX 091008
SVRLSX
ILC083-119-MOC183-189-091030-
/O.NEW.KLSX.SV.W.0034.110409T1008Z-110409T1030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
508 AM CDT SAT APR 9 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTH CENTRAL JERSEY COUNTY IN SOUTHWEST ILLINOIS...
NORTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
NORTH CENTRAL ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 530 AM CDT
* AT 507 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR ORCHARD FARMS...OR 7 MILES NORTHEAST OF ST.
CHARLES...AND MOVING NORTHEAST AT 35 MPH.
* LOCATIONS IMPACTED INCLUDE...
GODFREY...ALTON...GRAFTON...PORTAGE DES SIOUX...ELSAH...WEST ALTON
AND DELHI.
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 3877 9049 3887 9057 3890 9053 3896 9048
3897 9046 3908 9024 3890 9010
TIME...MOT...LOC 1008Z 243DEG 31KT 3888 9044
WIND...HAIL <50MPH 1.00IN
$$
TILLY1 follow-up statement
448
WWUS53 KLSX 091029
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
529 AM CDT SAT APR 9 2011
ILC083-119-MOC183-189-091039-
/O.EXP.KLSX.SV.W.0034.000000T0000Z-110409T1030Z/
MADISON IL-JERSEY IL-ST. LOUIS MO-ST. CHARLES MO-
529 AM CDT SAT APR 9 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. CHARLES...
NORTH CENTRAL ST. LOUIS...SOUTH CENTRAL JERSEY AND NORTHWESTERN
MADISON COUNTIES WILL EXPIRE AT 530 AM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3877 9049 3887 9057 3890 9053 3896 9048
3897 9046 3908 9024 3890 9010
TIME...MOT...LOC 1029Z 243DEG 31KT 3896 9023
$$
TESThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 2:46 AM CDT | Flash Flood Warning | LSX | Adams | 6 hr |
| Apr 9, 3:00 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 33 min |
| Apr 9, 3:44 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Pike | 31 min |
| Apr 9, 4:19 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 26 min |
| Apr 9, 5:21 AM CDT | Severe Thunderstorm Warning | LSX | Fayette, Montgomery | 39 min |
| Apr 9, 5:25 AM CDT | Severe Thunderstorm Warning | LSX | Macoupin, Madison | 35 min |
| Apr 9, 5:41 AM CDT | Severe Thunderstorm Warning | LSX | Bond, Madison | 49 min |
| Apr 9, 5:44 AM CDT | Areal Flood Advisory | LSX | Calhoun, Jersey, Macoupin, Madison | 3 hr |
| Apr 9, 6:43 AM CDT | Severe Thunderstorm Warning | LSX | Fayette, Marion | 32 min |
| Apr 9, 10:42 AM CDT | River Flood Warning | LSX | Adams | 32 days |
| Apr 9, 1:42 AM CDT | Flash Flood Warning | LSX | Marion, Shelby | 6 hr |
| Apr 9, 5:04 AM CDT | Severe Thunderstorm Warning | LSX | Iron, Madison, Reynolds, Saint Francois | 41 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.