Alert archive / Illinois / Flash Flood Warnings in 2002

Flash Flood Warning 12, NWS St. Louis, MO

May 12, 20025 counties in Illinois; Saint Charles County, Saint Louis County, Missouri

NWS St. Louis, MO issued this flash flood warning at May 12, 2002, 4:29 PM CDT for 5 counties in Illinois; Saint Charles County, Saint Louis County, Missouri. 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 12, 2002, 4:29 PM CDT (21:29 UTC)
Expired
May 12, 2002, 10:30 PM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Bond County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 63 km from the middle of the area, began a volume at 21:30 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, 9.5 hours before the alert went out and 180 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 12:00Z on 2002-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 77 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 12:00Z on 2002-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 square meters per square second.1939587897Sfc1 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
77 J/kg
Mixed-layer CIN
-142 J/kg
Mixed-layer LCL
829 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
-16 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 122129
FFWSTL
ILC005-083-117-119-135-MOC183-189-130330-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
425 PM CDT SUN MAY 12 2002

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI
  NORTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI
  BOND COUNTY IN SOUTH CENTRAL ILLINOIS
  SOUTHERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS
  JERSEY COUNTY IN SOUTHWEST ILLINOIS
  SOUTHERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS
  MADISON COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1030 PM CDT

* BETWEEN 330 AND 415 PM...A CLUSTER OF THUNDERSTORMS HAS PRODUCED
  EXTREMELY HEAVY RAIN FROM ST. CHARLES COUNTY IN
  MISSOURI...THROUGH JERSEY...SOUTHERN MACOUPIN...AND MADISON 
  COUNTIES IN ILLINOIS.  WELL OVER AN INCH OF RAIN WAS PRODUCED BY
  THIS COMPLEX...AND EXTENSIVE STREET AND VIADUCT FLOODING HAS BEEN
  REPORTED IN THE GODFREY AREA.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE
  AFFECTING THE GODFREY...PORTAGE DES SIOUX...
  WENTZVILLE...JERSEYVILLE..BUNKER HILL...EDWARDSVILLE...
  GREENVILLE...AND HILLSBORO 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.

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...AND ONE FALSE STEP CAN TURN PLAYTIME INTO A TRAGEDY.

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 1:50 AM CDTFlash Flood WarningLSXAdams6 hr
May 12, 4:50 AM CDTFlash Flood WarningLSXCalhoun, Greene, Jersey, Macoupin6 hr
May 12, 5:09 PM CDTFlash Flood WarningLSXFayette5 hr
May 12, 6:44 PM CDTTornado WarningLSXRandolph46 min
May 11, 10:03 PM CDTSevere Thunderstorm WarningLSX42 min
May 11, 11:18 PM CDTFlash Flood WarningLSXKnox6 hr
May 12, 1:15 AM CDTFlash Flood WarningLSXLewis, Shelby6 hr
May 12, 1:06 PM CDTSevere Thunderstorm WarningLSX39 min
May 12, 1:40 PM CDTSevere Thunderstorm WarningLSX35 min
May 12, 2:00 PM CDTSevere Thunderstorm WarningLSX45 min
May 12, 2:04 PM CDTSevere Thunderstorm WarningLSX26 min
May 12, 2:24 PM CDTSevere Thunderstorm WarningLSX51 min
May 12, 2:41 PM CDTSevere Thunderstorm WarningLSX49 min
May 12, 3:39 PM CDTSevere Thunderstorm WarningLSX51 min
May 12, 5:02 PM CDTSevere Thunderstorm WarningLSX28 min
May 12, 5:17 PM CDTSevere Thunderstorm WarningLSX28 min
May 12, 5:36 PM CDTSevere Thunderstorm WarningLSX24 min
May 12, 6:00 PM CDTSevere Thunderstorm WarningLSX45 min
May 12, 6:07 PM CDTTornado WarningLSXSainte Genevieve, Saint Francois, Washington38 min
May 12, 6:16 PM CDTSevere Thunderstorm WarningLSX44 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.