Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 91, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 15, 2012, 7:38 PM CDT for Jersey County, Madison County, Illinois; Saint Charles County, Saint Louis County, Missouri. It was in force for 32 min. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 15, 2012, 7:38 PM CDT (00:38 UTC)
- Expired
- Apr 15, 2012, 8:10 PM CDT
- In force
- 32 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 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 00:40 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 15, 7:39 PM CDT | TSTM WND GST 65 | 2 Ene St. Peters, MO | AT CAVE SPRINGS AND MEXICO ROAD. |
| Apr 15, 7:45 PM CDT | TSTM WND DMG | St. Charles, MO | 12 INCH DIAMETER TREE SNAPPED OFF AT ITS TRUNK IN ST. CHARLES. |
| Apr 15, 7:49 PM CDT | TSTM WND GST 56 | 4 Nne Orchard Farms, MO | |
| Apr 15, 7:55 PM CDT | TSTM WND DMG | Elsah, IL | DISPATCH REPORTS THAT A TREE HAD TO BE REMOVED FROM A ROAD IN ELSAH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 15, 4:42 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.6 hours before the alert went out and 211 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
- 502 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 972 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 346 m²/s²
- 0-3 km storm-relative helicity
- 388 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 5.6
The text
As transmitted, in the capitals the NWS used until 2016.
186
WUUS53 KLSX 160038
SVRLSX
ILC083-119-MOC183-189-160130-
/O.NEW.KLSX.SV.W.0091.120416T0038Z-120416T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
738 PM CDT SUN APR 15 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTH CENTRAL JERSEY COUNTY IN SOUTHWEST ILLINOIS...
WESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
EASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 830 PM CDT
* AT 736 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR MARYLAND
HEIGHTS...AND MOVING NORTHEAST AT 50 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...TRAINED WEATHER SPOTTERS.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
* LOCATIONS IMPACTED INCLUDE...
MARYLAND HEIGHTS...ST. CHARLES...OLIVETTE...OVERLAND...UNIVERSITY
CITY...ST. ANN...BRIDGETON...WOODSON TERRACE...ST. JOHN...LAMBERT
FIELD...BEL-RIDGE...HILLSDALE...BERKELEY...NORMANDY...KINLOCH...
HAZELWOOD...COOL VALLEY...NORTHWOODS...FERGUSON AND JENNINGS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS 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.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3870 9021 3873 9021 3875 9018 3878 9018
3868 9028 3859 9055 3882 9062 3887 9058
3888 9054 3891 9050 3897 9045 3897 9047
3913 9031 3878 8994
TIME...MOT...LOC 0038Z 233DEG 46KT 3873 9051
HAIL...<.75IN
WIND...60 MPH
$$
BRITT2 follow-up statements
532
WWUS53 KLSX 160050
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
750 PM CDT SUN APR 15 2012
ILC083-119-MOC183-189-160130-
/O.CON.KLSX.SV.W.0091.000000T0000Z-120416T0130Z/
JERSEY IL-MADISON IL-ST. CHARLES MO-ST. LOUIS MO-
750 PM CDT SUN APR 15 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
ST. LOUIS...NORTHEASTERN ST. CHARLES...NORTHWESTERN MADISON AND SOUTH
CENTRAL JERSEY COUNTIES UNTIL 830 PM CDT...
AT 749 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ALONG A
LINE EXTENDING FROM ELSAH TO BERKELEY...AND MOVING NORTHEAST AT 55
MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...TRAINED WEATHER SPOTTERS.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
LOCATIONS IMPACTED INCLUDE...
COOL VALLEY...NORTHWOODS...FLORISSANT...FERGUSON...JENNINGS...
DELLWOOD...BLACK JACK...BELLEFONTAINE NEIGHBORS...SPANISH LAKE...
GODFREY...ALTON...WOOD RIVER...EDWARDSVILLE...ELSAH...PORTAGE DES
SIOUX...WEST ALTON...HARTFORD...ROXANA...MCCLUSKY AND DELHI.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT
IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE
TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT
OR SMALL INTERIOR ROOM.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3870 9021 3873 9021 3875 9018 3877 9017
3878 9018 3868 9028 3862 9047 3887 9058
3888 9054 3891 9050 3897 9045 3897 9047
3913 9031 3878 8994
TIME...MOT...LOC 0050Z 233DEG 46KT 3895 9038 3874 9033
HAIL...<.75IN
WIND...60 MPH
$$
BRITT590
WWUS53 KLSX 160110
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
810 PM CDT SUN APR 15 2012
ILC083-119-MOC183-189-160119-
/O.CAN.KLSX.SV.W.0091.000000T0000Z-120416T0130Z/
JERSEY IL-MADISON IL-ST. CHARLES MO-ST. LOUIS MO-
810 PM CDT SUN APR 15 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. LOUIS...
NORTHEASTERN ST. CHARLES...NORTHWESTERN MADISON AND SOUTH CENTRAL
JERSEY COUNTIES IS CANCELLED...
THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA.
ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT.
LAT...LON 3870 9021 3873 9021 3875 9018 3877 9017
3878 9018 3868 9028 3862 9047 3887 9058
3888 9054 3891 9050 3897 9045 3897 9047
3913 9031 3878 8994
TIME...MOT...LOC 0109Z 233DEG 46KT 3909 9013 3888 9008
$$
BRITTThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 7:52 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 38 min |
| Apr 15, 8:01 PM CDT | Severe Thunderstorm Warning | LSX | Jersey, Macoupin, Madison | 30 min |
| Apr 16, 6:19 AM CDT | River Flood Warning | LSX | Saint Charles | 6 hr |
Nearby
Severe Thunderstorm Warnings in Illinois, 2012Severe Thunderstorm Warnings in Missouri, 2012Every severe thunderstorm warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.