Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 142, NWS St. Louis, MO

April 25, 2011Washington County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 25, 2011, 7:47 PM CDT for Washington County, Illinois. It was in force for 28 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 25, 2011, 7:47 PM CDT (00:47 UTC)
Expired: Apr 25, 2011, 8:15 PM CDT
In force: 28 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Washington County, IL

The radar

The Evansville,IN radar (KVWX), 131 km from the middle of the area, began a volume at 00:49 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, 0.8 hours before the alert went out and 216 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: 48 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

827 
WUUS53 KLSX 260047
SVRLSX
ILC189-260115-
/O.NEW.KLSX.SV.W.0142.110426T0047Z-110426T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
747 PM CDT MON APR 25 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 815 PM CDT

* AT 745 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR TAMAROA...OR 7 MILES
  NORTHEAST OF PINCKNEYVILLE...AND MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ASHLEY...IRVINGTON...POSEN...DU BOIS...RADOM AND RICHVIEW.

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 3821 8915 3821 8923 3821 8944 3822 8944
      3846 8915 3845 8914 3822 8914
TIME...MOT...LOC 0048Z 230DEG 35KT 3816 8926
WIND...HAIL 60MPH <.75IN

$$

TRUETT

1 follow-up statement

024 
WWUS53 KLSX 260114
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
814 PM CDT MON APR 25 2011

ILC189-260124-
/O.EXP.KLSX.SV.W.0142.000000T0000Z-110426T0115Z/
WASHINGTON IL-
814 PM CDT MON APR 25 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON COUNTY
WILL EXPIRE AT 815 PM CDT...

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

LAT...LON 3821 8915 3821 8923 3821 8944 3822 8944
      3846 8915 3845 8914 3822 8914
TIME...MOT...LOC 0114Z 230DEG 35KT 3832 8901

$$

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 7:23 PM CDT	Flash Flood Warning	LSX	Clinton, Marion, Monroe, Randolph, Saint Clair, Washington	9 hr
Apr 25, 9:00 PM CDT	Flash Flood Warning	LSX	Bond, Clinton, Fayette, Madison, Marion, Montgomery	6 hr
Apr 26, 4:50 AM CDT	Areal Flood Warning	LSX	Clinton, Marion, Monroe, Randolph, Saint Clair, Washington	30 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2011 Every 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.