Alert archive / Illinois / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 224, NWS St. Louis, MO

May 25, 2011Washington County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 25, 2011, 5:24 PM CDT for Washington County, Illinois. It was in force for 51 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: May 25, 2011, 5:24 PM CDT (22:24 UTC)
Expired: May 25, 2011, 6:15 PM CDT
In force: 51 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

County Washington County, IL

The radar

The St Louis radar (KLSX), 126 km from the middle of the area, began a volume at 22:25 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 25, 11:09 AM CDT	Tornado Watch PDS	SPC	10 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.4 hours before the alert went out and 206 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: 1832 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 253 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 10.1

Open this sounding in Storm Lab

The text

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

348 
WUUS53 KLSX 252224
SVRLSX
ILC189-252315-
/O.NEW.KLSX.SV.W.0224.110525T2224Z-110525T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
524 PM CDT WED MAY 25 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 615 PM CDT

* AT 521 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 5
  MILES NORTHWEST OF TAMAROA...OR 9 MILES NORTHEAST OF
  PINCKNEYVILLE...AND MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NASHVILLE...ASHLEY...IRVINGTON...WAMAC...POSEN...DU BOIS...RADOM...
  BEAUCOUP...HUEGELY...NEW MINDEN...RICHVIEW AND HOYLETON.

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.

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.

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF THESE
STORMS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE WEATHER...
INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE WINDS AND
POSSIBLY TORNADOES. MOVE QUICKLY TO A SAFE SHELTER...PREFERABLY INTO
AN INTERIOR ROOM...SUCH AS A BATHROOM OR A CLOSET...OR INTO A
BASEMENT.

&&

LAT...LON 3821 8916 3821 8943 3849 8940 3850 8937
      3851 8936 3850 8915
TIME...MOT...LOC 2224Z 207DEG 34KT 3821 8928
WIND...HAIL 70MPH 1.00IN

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 2:00 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Calhoun, Greene, Jersey, Pike	45 min
May 25, 4:15 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	35 min
May 25, 4:39 AM CDT	Tornado Warning	LSX	Calhoun, Greene, Jersey	22 min
May 25, 7:47 AM CDT	Areal Flood Advisory	LSX	Adams, Brown, Pike	3 hr
May 25, 11:24 AM CDT	River Flood Warning	LSX	Pike, Scott	47 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Adams	13 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Adams	13 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Adams	13 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Pike	40 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Pike	15 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Pike	40 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Calhoun	46 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Calhoun	43 days
May 25, 12:15 PM CDT	River Flood Warning	LSX	Saint Clair	46 days
May 25, 12:18 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	42 min
May 25, 12:56 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	13 min
May 25, 1:05 PM CDT	Tornado Warning	LSX	Fayette	16 min
May 25, 1:09 PM CDT	Areal Flood Advisory	LSX	Fayette, Montgomery	4 hr
May 25, 2:49 PM CDT	Tornado Warning	LSX	Monroe	32 min
May 25, 2:54 PM CDT	Tornado Warning	LSX	Adams, Pike	51 min
May 25, 2:55 PM CDT	Tornado Warning	LSX	Calhoun, Pike	50 min
May 25, 3:25 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison, Montgomery	50 min
May 25, 3:29 PM CDT	Tornado Warning	LSX	Calhoun, Greene, Jersey	46 min
May 25, 3:30 PM CDT	Tornado Warning	LSX	Monroe	33 min
May 25, 3:34 PM CDT	Tornado Warning	LSX	Adams, Pike	41 min
May 25, 3:36 PM CDT	Tornado Warning	LSX	Jersey, Macoupin, Madison	29 min
May 25, 3:37 PM CDT	Tornado Warning	LSX	Adams, Pike	25 min
May 25, 3:43 PM CDT	Tornado Warning	LSX	Calhoun, Greene, Pike	47 min
May 25, 3:53 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	52 min
May 25, 4:00 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	45 min
May 25, 4:05 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	40 min
May 25, 4:11 PM CDT	Tornado Warning	LSX	Madison, Monroe, Saint Clair	49 min
May 25, 4:23 PM CDT	Tornado Warning	LSX	Monroe, Randolph, Saint Clair	52 min
May 25, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin, Madison	38 min
May 25, 4:51 PM CDT	Tornado Warning	LSX	Monroe	39 min
May 25, 4:56 PM CDT	Tornado Warning	LSX	Macoupin, Madison	49 min
May 25, 5:00 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	25 min
May 25, 5:08 PM CDT	Tornado Warning	LSX	Clinton, Madison, Saint Clair, Washington	52 min
May 25, 5:12 PM CDT	Tornado Warning	LSX	Randolph, Saint Clair	48 min
May 25, 5:16 PM CDT	Areal Flood Advisory	LSX	Brown	4 hr
May 25, 5:23 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Randolph	52 min
May 25, 5:30 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison, Montgomery	45 min
May 25, 5:34 PM CDT	Tornado Warning	LSX	Bond, Clinton, Fayette, Madison, Marion, Montgomery	41 min
May 25, 5:37 PM CDT	Flash Flood Warning	LSX	Brown	4 hr
May 25, 5:46 PM CDT	Tornado Warning	LSX	Clinton, Randolph, Saint Clair, Washington	44 min
May 25, 5:48 PM CDT	Areal Flood Advisory	LSX	Bond, Fayette, Madison, Montgomery, Saint Clair	5 hr
May 25, 5:51 PM CDT	Tornado Warning	LSX	Randolph	29 min
May 25, 6:02 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	43 min
May 25, 6:23 PM CDT	Tornado Warning	LSX	Clinton, Marion, Washington	34 min
May 25, 6:33 PM CDT	River Flood Warning	LSX	Brown	40 hr
May 25, 6:34 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion, Montgomery	26 min
May 25, 6:48 PM CDT	Tornado Warning	LSX	Fayette, Marion	26 min

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.