Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 35, NWS St. Louis, MO

March 2, 2012Clinton County, Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 2, 2012, 9:49 AM CST for Clinton County, Madison County, Saint Clair County, Illinois. It was in force for 41 min. 6 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: Mar 2, 2012, 9:49 AM CST (15:49 UTC)
Expired: Mar 2, 2012, 10:30 AM CST
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, IL, Madison County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 74 km from the middle of the area, began a volume at 15:51 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
Mar 2, 10:00 AM CST	TSTM WND DMG	6 Se Belleville, IL	8 50 FOOT PINE TREES SNAPPED HALF WAY UP ALONG RENTCHLER ROAD
Mar 2, 10:03 AM CST	HAIL 0.5	O'Fallon, IL
Mar 2, 10:10 AM CST	TORNADO	4 S Trenton, IL	TORNADO OBSERVED FUNNEL CLOUD 50FT OFF THE GROUND WITH DEBRIS UNDER IT...MINOR DAMAGE...FENCES KNOCKED DOWN
Mar 2, 10:11 AM CST	HAIL 0.75	O'Fallon, IL
Mar 2, 10:20 AM CST	HAIL 1.25	Aviston, IL
Mar 2, 10:33 AM CST	TSTM WND DMG	2 Ese Belleville, IL	MINOR SHINGLE DAMAGE

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
Mar 2, 5:52 AM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 3.8 hours before the alert went out and 210 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1770 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

176 
WUUS53 KLSX 021549
SVRLSX
ILC027-119-163-021630-
/O.NEW.KLSX.SV.W.0035.120302T1549Z-120302T1630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
949 AM CST FRI MAR 2 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 1030 AM CST

* AT 947 AM CST...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
  CENTREVILLE...AND MOVING EAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WASHINGTON PARK...BELLEVILLE...CASEYVILLE...SWANSEA...FAIRVIEW
  HEIGHTS...COLLINSVILLE...SHILOH...O'FALLON...SCOTT AFB...
  MASCOUTAH...LEBANON...NEW BADEN...HIGHLAND...ST. JACOB...NEW
  MEMPHIS...TRENTON...ALBERS...AVISTON...SUMMERFIELD AND
  DAMIANSVILLE.

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 3847 8961 3846 8962 3844 9017 3845 9018
      3861 9018 3882 8960
TIME...MOT...LOC 1549Z 255DEG 47KT 3853 9009
WIND...HAIL 60MPH 1.00IN

$$

CVKING

1 follow-up statement

014 
WWUS53 KLSX 021607
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1007 AM CST FRI MAR 2 2012

ILC027-119-163-021630-
/O.CON.KLSX.SV.W.0035.000000T0000Z-120302T1630Z/
MADISON IL-ST. CLAIR IL-CLINTON IL-
1007 AM CST FRI MAR 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
CLINTON...NORTHEASTERN ST. CLAIR AND SOUTHEASTERN MADISON COUNTIES
UNTIL 1030 AM CST...

AT 1004 AM CST...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
LEBANON...MOVING EAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  HIGHLAND...ST. JACOB...TRENTON AND AVISTON.

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.

&&

LAT...LON 3857 8961 3852 8989 3871 8991 3882 8960
TIME...MOT...LOC 1607Z 255DEG 47KT 3865 8977
WIND...HAIL 60MPH 1.00IN

$$

CVKING

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 2, 5:10 AM CST	Severe Thunderstorm Warning	LSX	Calhoun	39 min
Mar 2, 5:56 AM CST	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Macoupin, Madison	49 min
Mar 2, 6:36 AM CST	Severe Thunderstorm Warning	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	39 min
Mar 2, 7:07 AM CST	Severe Thunderstorm Warning	LSX	Calhoun, Pike	30 min
Mar 2, 7:14 AM CST	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	25 min
Mar 2, 10:10 AM CST	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette	50 min
Mar 2, 11:12 AM CST	Severe Thunderstorm Warning	LSX	Fayette, Marion	16 min
Mar 2, 11:29 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Randolph, Washington	31 min
Mar 2, 11:41 AM CST	Severe Thunderstorm Warning	LSX	Marion	49 min
Mar 2, 1:59 PM CST	Wind Advisory	LSX	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	4 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2012 Every 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.