Alert archive / Illinois / Flash Flood Warnings in 2003

Flash Flood Warning 15, NWS St. Louis, MO

June 11, 20034 counties in Illinois

NWS St. Louis, MO issued this flash flood warning at Jun 11, 2003, 9:30 PM CDT for 4 counties in Illinois. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 11, 2003, 9:30 PM CDT (02:30 UTC)
Expired
Jun 12, 2003, 3:15 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Clinton County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.5 hours before the alert went out and 217 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2003-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 467 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2003-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
467 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
1056 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
26 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.

000 
WGUS53 KLSX 120232
FFWLSX
ILC027-157-163-189-120815-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
930 PM CDT WED JUN 11 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS
  WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS
  RANDOLPH COUNTY IN SOUTHWEST ILLINOIS
  ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 315 AM CDT

* AT 918 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED 
  THUNDERSTORMS HAD PRODUCED VERY HEAVY RAINFALL OF 2 TO 4 INCHES IN 
  THE PAST 4 HOURS ACROSS PARTS OF THE WARNING AREA.  SEVERAL ROADS
  HAVE BEEN FLOODED...AND HAVE EITHER BEEN CLOSED OR HAD HIGH WATER 
  SIGNS PLACED FOR THEM.  MOST NOTABLE ARE ILLINOIS ROUTES 4 IN 
  EASTERN ST CLAIR COUNTY AND RANDOLPH COUNTY...159 AROUND SMITHTON 
  IN SOUTHERN ST CLAIR COUNTY...AND 161 IN WESTERN CLINTON 
  COUNTY...AND US HIGHWAY 50 IN WESTERN CLINTON COUNTY.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA INTO THE EARLY 
  MORNING HOURS OF THURSDAY.  RAIN...ALONG WITH SOME IMBEDDED 
  THUNDERSTORMS CONTAINING HEAVIER RAIN...IS EXPECTED TO COME TO AN 
  END AROUND MIDNIGHT AND WILL GIVE THE FLOODING A CHANCE TO SUBSIDE.

MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR LOW WATER CROSSINGS IF WATER COVERS THE
ROADWAY. DO NOT DRIVE AROUND BARRICADES IF YOUR VEHICLE STALLS...
ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. ACT QUICKLY IF FLASH FLOODING IS OBSERVED. MOVE
TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT
TO FLOODING WHEN WATER BEGINS RISING.

$$

TES

Nearby

Flash Flood Warnings in Illinois, 2003Every flash flood warning in 2003

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.