Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 31, NWS St. Louis, MO

March 2, 20125 counties in Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 2, 2012, 6:36 AM CST for 5 counties in Illinois. It was in force for 39 min. 2 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, 6:36 AM CST (12:36 UTC)
Expired: Mar 2, 2012, 7:15 AM CST
In force: 39 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

Counties Bond County, IL, Fayette County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 99 km from the middle of the area, began a volume at 12:37 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, 6:46 AM CST	HAIL 1	New Douglas, IL
Mar 2, 7:03 AM CST	HAIL 1	Coffeen, IL

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, 2:07 AM CST	Severe Thunderstorm Watch	SPC	5 hr
Mar 2, 5:52 AM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 0.6 hours before the alert went out and 153 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.

289 
WUUS53 KLSX 021236
SVRLSX
ILC005-051-117-119-135-021315-
/O.NEW.KLSX.SV.W.0031.120302T1236Z-120302T1315Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BOND COUNTY IN SOUTH CENTRAL ILLINOIS...
  WESTERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS...
  EASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 715 AM CST

* AT 633 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL. 
  THIS STORM WAS LOCATED NEAR PRAIRIETOWN...OR 7 MILES SOUTHWEST OF  
  STAUNTON...AND MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  STAUNTON...GILLESPIE...LITCHFIELD...GREENVILLE...HILLSBORO...
  VANDALIA...WILSONVILLE...ALHAMBRA...LIVINGSTON...BENLD...MOUNT
  OLIVE...POCAHONTAS...SORENTO...RENO...TAYLOR SPRINGS...WOBURN...
  COFFEEN...MULBERRY GROVE...VAN BURENSBURG AND WITT.

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 3872 8991 3913 9012 3936 8946 3935 8933
      3888 8902
TIME...MOT...LOC 1236Z 245DEG 52KT 3899 8985
WIND...HAIL <50MPH 1.50IN

$$

KANOFSKY

1 follow-up statement

143 
WWUS53 KLSX 021258
SVSLSX

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

ILC119-021307-
/O.CAN.KLSX.SV.W.0031.000000T0000Z-120302T1315Z/
MADISON IL-
658 AM CST FRI MAR 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MADISON COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3888 8902 3878 8959 3887 8960 3888 8964
      3900 8964 3900 8976 3920 8991 3936 8947
      3935 8933
TIME...MOT...LOC 1257Z 245DEG 52KT 3911 8949

$$

ILC005-051-117-135-021315-
/O.CON.KLSX.SV.W.0031.000000T0000Z-120302T1315Z/
MACOUPIN IL-MONTGOMERY IL-FAYETTE IL-BOND IL-
658 AM CST FRI MAR 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BOND...WESTERN
FAYETTE...MONTGOMERY AND SOUTHEASTERN MACOUPIN COUNTIES UNTIL 715 AM
CST...

AT 654 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED NEAR TAYLOR SPRINGS...OR 6 MILES SOUTHWEST OF
HILLSBORO...MOVING NORTHEAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  HILLSBORO...VANDALIA...RAYMOND...WOBURN...COFFEEN...MULBERRY
  GROVE...VAN BURENSBURG...WITT...SHOBONIER...SMITHBORO...PLEASANT
  MOUND...PITTSBURG...IRVING...CHAPMAN...FILLMORE...HAGERSTOWN...
  SHAFTER...BINGHAM AND COALTON.

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 3888 8902 3878 8959 3887 8960 3888 8964
      3900 8964 3900 8976 3920 8991 3936 8947
      3935 8933
TIME...MOT...LOC 1257Z 245DEG 52KT 3911 8949
WIND...HAIL <50MPH 1.00IN

$$

KANOFSKY

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, 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, 9:49 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	41 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.