Alert archive / Illinois / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 124, NWS St. Louis, MO

May 27, 2004Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 27, 2004, 7:45 PM CDT for Marion County, Illinois. It was in force for 30 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 27, 2004, 7:45 PM CDT (00:45 UTC)
Expired: May 27, 2004, 8:15 PM CDT
In force: 30 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Marion County, IL

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 27, 2:25 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.8 hours before the alert went out and 166 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: 651 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1078 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -105 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: -0.4
Supercell composite: -3.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 280045
SVRLSX
ILC121-280115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
746 PM CDT THU MAY 27 2004

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARION COUNTY IN SOUTH CENTRAL ILLINOIS

* UNTIL 815 PM CDT

* AT 746 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER OMEGA...MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HELM

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
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.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

LAT...LON 3882 8914 3848 8914 3848 8871 3884 8871

$$

TES/JC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 7:31 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	44 min
May 27, 7:38 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	52 min
May 27, 7:40 PM CDT	Flash Flood Warning	LSX	Monroe	4 hr
May 27, 8:02 PM CDT	Tornado Warning	LSX	Monroe	43 min
May 27, 8:10 PM CDT	Flash Flood Warning	LSX	Clinton, Marion, Saint Clair	16 hr
May 27, 8:10 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	35 min
May 27, 8:19 PM CDT	Severe Thunderstorm Warning	LSX	Washington	41 min
May 27, 8:23 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	52 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2004 Every severe thunderstorm warning in 2004

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.