Alert archive / Illinois / Flash Flood Warnings in 2004

Flash Flood Warning 32, NWS St. Louis, MO

August 27, 2004Adams County, Brown County, Illinois

NWS St. Louis, MO issued this flash flood warning at Aug 27, 2004, 9:04 PM CDT for Adams County, Brown County, 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 outline as issued.

The facts

Issued: Aug 27, 2004, 9:04 PM CDT (02:04 UTC)
Expired: Aug 28, 2004, 3:00 AM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

Counties Adams County, IL, Brown County, IL

The radar

The Lincoln radar (KILX), 141 km from the middle of the area, began a volume at 02:05 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

Davenport, (KDVN), launched 00:00Z, 2.1 hours before the alert went out and 187 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: 1345 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.2

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 280209
FFWLSX
ILC001-009-280800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
904 PM CDT FRI AUG 27 2004

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ADAMS COUNTY IN WEST CENTRAL ILLINOIS
  BROWN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 300 AM CDT

* AT 904 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN WERE MOVING ACROSS
  ADAMS COUNTY. THESE THUNDERSTORMS WILL MOVE ACROSS BROWN 
  COUNTY DURING THE EVENING. THIS AREA RECEIVED HEAVY RAIN
  THIS MORNING...AND THE GROUND IS SATURATED IN MOST AREAS.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE
  AFFECTING THE QUINCY...MENDON...AND CAMP POINT AREAS. 

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.

LAT...LON 4018 9095 3997 9054 3987 9060 3985 9092
      3981 9097 3978 9141 4019 9148

$$

1 follow-up statement

000 
WGUS73 KLSX 280806
FFSLSX
ILC001-009-280830-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
305 AM CDT SAT AUG 28 2004

...FLASH FLOOD WARNING FOR BROWN AND ADAMS COUNTIES HAS EXPIRED...

SINCE MIDNIGHT...RADAR...SATELLITE...AND SURFACE DATA INDICATE THAT 
THE RAINFALL ON THE ILLINOIS SIDE OF THE MISSISSIPPI RIVER HAS 
DIMINISHED CONSIDERABLY...LESSENING THE FLASH FLOOD THREAT.

HOWEVER...DUE TO THE EXTREMELY HEAVY RAINS OF THE PAST WEEK...SMALL 
CREEKS AND STREAMS WILL BE RUNNING NEAR BANKFULL DURING THE 
REMAINDER OF THE PREDAWN HOURS.   MOTORISTS SHOULD CONTINUE TO USE 
CAUTION WHILE DRIVING INTO LOW LYING OR POORLY DRAINED AREAS.  IN 
ADDITION...ROADS AND BRIDGES IN AREAS THAT DID EXPERIENCE FLOODING 
MAY HAVE BEEN DAMAGED BY THE RAPIDLY FLOWING FLOOD WATERS.

ALSO...A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE AREA.  IF 
THUNDERSTORMS WITH HEAVY RAIN DO REDEVELOP EARLY TODAY...ADDITIONAL
FLOODING WILL BE A VERY REAL POSSIBILITY.

$$

TRUETT

Nearby

Flash Flood Warnings in Illinois, 2004 Every flash flood 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; radar from the NEXRAD Level II archive.