Alert archive / Illinois / Flash Flood Warnings in 2003

Flash Flood Warning 33, NWS St. Louis, MO

July 18, 2003Brown County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 18, 2003, 7:20 AM CDT for Brown County, Illinois. It was in force for 4 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: Jul 18, 2003, 7:20 AM CDT (12:20 UTC)
Expired: Jul 18, 2003, 11:15 AM CDT
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Brown County, IL

The radar

The Lincoln radar (KILX), 117 km from the middle of the area, began a volume at 12:19 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 12:00Z, 0.3 hours before the alert went out and 179 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: 315 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 874 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 243 m²/s²
Significant tornado parameter: 0.0
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 181220
FFWLSX
ILC009-181615-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
720 AM CDT FRI JUL 18 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1115 AM CDT

* THUNDERSTORMS HAVE PRODUCED SEVERAL ROUNDS OF HEAVY RAIN OVER 
EASTERN BROWN COUNTY EARLY THIS MORNING...AND RADAR INDICATES THAT 
SOME AREAS IN EASTERN BROWN COUNTY MAY HAVE RECEIVED UP TO 4 INCHES 
OF RAIN.  ANOTHER THUNDERSTORM COMPLEX IS HEADING INTO THE 
AREA...AND MAY PRODUCE ANOTHER 1 OR 2 INCHES OF RAIN THROUGH 9 AM.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND ESPECIALLY IN 
EASTERN SECTIONS OF THE COUNTY...INCLUDING THE 
RIPLEY...COOPERSTOWN...AND LA GRANGE AREAS.   

IF FLASH FLOODING IS OBSERVED OR IMMINENT...MOVE QUICKLY TO HIGHER
GROUND. NEVER DRIVE INTO AN AREA WHERE WATER COVERS THE ROAD.

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.

DURING HEAVY RAINS...KEEP CHILDREN AWAY FROM CREEKS AND STORM DRAINS.
GENTLY FLOWING WATER CAN TURN INTO A RAGING TORRENT IN A MATTER OF
MINUTES.

LAT...LON 4001 9053 3987 9058 3987 9091 4014 9092

$$

TRUETT

1 follow-up statement

000 
WGUS73 KLSX 181524
FFSLSX
ILC009-181615-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1020 AM CDT FRI JUL 18 2003

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR BROWN COUNTY UNTIL
1115 AM CDT...

AT 1015 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT UP TO 
3 TO 4 INCHES OF RAIN HAS FALLEN ACROSS EASTERN BROWN COUNTY. IN 
ADDITION MORE THUNDERSTORMS WILL PASS THROUGH THE AREA BY 1100 AM 
WHICH MAY PRODUCE ANOTHER 1 INCH OF RAIN. 

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. AVOID BRIDGES...DIPS...
OR OTHER LOW LYING AREAS...AND NEVER DRIVE YOUR VEHICLE INTO AREAS
WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT
TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER
SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.

$$
JPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 4:56 AM CDT	Severe Thunderstorm Warning	LSX	Brown	64 min
Jul 18, 5:29 AM CDT	Tornado Warning	LSX	Fayette, Montgomery	76 min
Jul 18, 5:56 AM CDT	Severe Thunderstorm Warning	LSX	Pike	49 min
Jul 18, 6:51 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin	39 min
Jul 18, 6:56 AM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey	34 min
Jul 18, 7:11 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	49 min
Jul 18, 7:22 AM CDT	Severe Thunderstorm Warning	LSX	Fayette	83 min
Jul 18, 7:31 AM CDT	Severe Thunderstorm Warning	LSX	Madison	59 min
Jul 18, 7:49 AM CDT	Severe Thunderstorm Warning	LSX	Brown, Pike	41 min
Jul 18, 8:22 AM CDT	Tornado Warning	LSX	Calhoun, Pike	38 min
Jul 18, 8:38 AM CDT	Severe Thunderstorm Warning	LSX	Greene	37 min
Jul 18, 8:50 AM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin	40 min
Jul 18, 8:59 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun	31 min
Jul 18, 9:14 AM CDT	Severe Thunderstorm Warning	LSX	Madison	46 min
Jul 18, 9:41 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	49 min
Jul 18, 10:02 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	43 min

Nearby

Flash Flood Warnings in Illinois, 2003 Every 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; radar from the NEXRAD Level II archive.