Alert archive / Illinois / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 78, NWS St. Louis, MO

March 23, 2012Calhoun County, Greene County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 23, 2012, 4:26 PM CDT for Calhoun County, Greene County, Illinois. It was in force for 14 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: Mar 23, 2012, 4:26 PM CDT (21:26 UTC)
Expired: Mar 23, 2012, 4:40 PM CDT
In force: 14 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Calhoun County, IL, Greene County, IL

The radar

The St Louis radar (KLSX), 64 km from the middle of the area, began a volume at 21:29 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 12:00Z, 9.4 hours before the alert went out and 202 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: 808 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 57 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.

784 
WUUS53 KLSX 232126
SVRLSX
ILC013-061-232200-
/O.NEW.KLSX.SV.W.0078.120323T2126Z-120323T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
426 PM CDT FRI MAR 23 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHWESTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...

* UNTIL 500 PM CDT

* AT 425 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 8 MILES NORTH OF HARDIN...OR 11 MILES NORTHEAST
  OF ELSBERRY...AND MOVING NORTH AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BELLEVIEW...KAMPSVILLE...MOZIER AND HAYPRESS.

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 3921 9047 3916 9069 3923 9073 3926 9073
      3926 9075 3940 9082 3940 9061 3940 9062
      3941 9053
TIME...MOT...LOC 2127Z 162DEG 15KT 3927 9062
WIND...HAIL <50MPH 1.00IN

$$

CARNEY

1 follow-up statement

555 
WWUS53 KLSX 232140
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
440 PM CDT FRI MAR 23 2012

ILC013-061-232150-
/O.CAN.KLSX.SV.W.0078.000000T0000Z-120323T2200Z/
CALHOUN IL-GREENE IL-
440 PM CDT FRI MAR 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GREENE AND
CALHOUN COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL...GUSTY WINDS...DANGEROUS LIGHTNING...AND HEAVY 
RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3921 9047 3916 9069 3923 9073 3926 9073
      3926 9075 3940 9082 3940 9061 3940 9062
      3941 9053
TIME...MOT...LOC 2140Z 162DEG 15KT 3932 9064

$$

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 23, 12:59 PM CDT	Tornado Warning	LSX	Washington	46 min
Mar 23, 1:47 PM CDT	Tornado Warning	LSX	Marion	43 min
Mar 23, 2:15 PM CDT	Tornado Warning	LSX	Marion	30 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.