Alert archive / Illinois / Flash Flood Warnings in 2002

Flash Flood Warning 4, NWS St. Louis, MO

May 7, 2002Saint Charles County, Warren County, Missouri; 5 counties in Illinois

NWS St. Louis, MO issued this flash flood warning at May 7, 2002, 3:58 AM CDT for Saint Charles County, Warren County, Missouri; 5 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
May 7, 2002, 3:58 AM CDT (08:58 UTC)
Expired
May 7, 2002, 10:00 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Montgomery County, IL, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 51 km from the middle of the area, began a volume at 08:58 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 00:00Z, 9.0 hours before the alert went out and 192 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 2002-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 854 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 2002-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.1939587897117Sfc1 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
854 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
913 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 070858
FFWSTL
ILC013-061-083-117-135-MOC183-219-071500-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
355 AM CDT TUE MAY 7 2002

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI
  WARREN COUNTY IN EAST CENTRAL MISSOURI
  MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS
  GREENE COUNTY IN SOUTHWEST ILLINOIS
  JERSEY COUNTY IN SOUTHWEST ILLINOIS
  MACOUPIN COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1000 AM CDT

* THUNDERSTORMS WITH EXTREMELY HEAVY RAIN HAS BEEN MOVING ACROSS THE
  BI-STATE AREA SINCE SHORTLY AFTER MIDNIGHT.  THIS RAIN...
  COMBINED WITH THE ALREADY SATURATED GROUND...WILL MAKE FOR A
  DANGEROUS FLASH FLOOD THREAT THE REMAINDER OF THE NIGHT...AND
  INTO THE MORNING HOURS.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE
  AFFECTING WARRENTON...ST CHARLES...HARDIN...JERSEYVILLE...
  CARROLLTON...CARLINVILLE...AND LITCHFIELD...

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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 6, 11:04 PM CDTSevere Thunderstorm WarningLSX41 min
May 6, 11:34 PM CDTSevere Thunderstorm WarningLSX41 min
May 6, 11:45 PM CDTSevere Thunderstorm WarningLSX45 min
May 7, 12:11 AM CDTSevere Thunderstorm WarningLSX64 min
May 7, 12:13 AM CDTTornado WarningLSXAudrain, Callaway62 min
May 7, 12:19 AM CDTSevere Thunderstorm WarningLSX41 min
May 7, 12:38 AM CDTSevere Thunderstorm WarningLSX22 min
May 7, 12:53 AM CDTFlash Flood WarningLSXAudrain, Boone, Callaway6 hr
May 7, 1:04 AM CDTSevere Thunderstorm WarningLSX41 min
May 7, 1:47 AM CDTSevere Thunderstorm WarningLSX28 min
May 7, 2:09 AM CDTFlash Flood WarningLSXLincoln, Montgomery5 hr
May 7, 2:09 AM CDTTornado WarningLSXLincoln51 min
May 7, 2:23 AM CDTTornado WarningLSXSaint Charles52 min
May 7, 3:10 AM CDTSevere Thunderstorm WarningLSX60 min
May 7, 3:11 AM CDTSevere Thunderstorm WarningLSX34 min
May 7, 3:18 AM CDTSevere Thunderstorm WarningLSX27 min
May 7, 3:27 AM CDTSevere Thunderstorm WarningLSX33 min
May 7, 3:38 AM CDTSevere Thunderstorm WarningLSX52 min
May 7, 3:46 AM CDTSevere Thunderstorm WarningLSX44 min
May 7, 3:49 AM CDTSevere Thunderstorm WarningLSX41 min
May 7, 4:02 AM CDTSevere Thunderstorm WarningLSX43 min
May 7, 2:41 AM CDTTornado WarningLSXMadison49 min
May 7, 3:00 AM CDTTornado WarningLSXMacoupin, Montgomery45 min

Nearby

Flash Flood Warnings in Illinois, 2002Flash Flood Warnings in Missouri, 2002Every flash flood warning in 2002

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.