Alert archive / Illinois / Flash Flood Warnings in 2002

Flash Flood Warning 13, NWS Chicago, IL

August 23, 2002Ford County, Iroquois County, Illinois

NWS Chicago, IL issued this flash flood warning at Aug 23, 2002, 10:15 AM CDT for Ford County, Iroquois County, Illinois. It was in force for 3 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 23, 2002, 10:15 AM CDT (15:15 UTC)
Expired
Aug 23, 2002, 1:00 PM CDT
In force
3 hr
Issued by
NWS Chicago, IL
Area
Counties, with a storm outline in the text

Counties Ford County, IL, Iroquois County, IL

The radar

The Chicago radar (KLOT), 106 km from the middle of the area, began a volume at 15:18 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, 3.3 hours before the alert went out and 91 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 2002-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 68 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2002-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.193958Sfc1 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
68 J/kg
Mixed-layer CIN
-145 J/kg
Mixed-layer LCL
826 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLOT 231515
FFWCHI
ILC053-075-231800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHICAGO IL
915 AM CDT FRI AUG 23 2002

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS EXTENDED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN FORD AND SOUTHERN IROQUOIS COUNTY IN EAST CENTRAL ILLINOIS

* UNTIL 100 PM CDT

* COOPERATIVE OBSERVERS REPORT THAT NEARLY 5 AND ONE HALF INCHES OF 
RAIN HAVE FALLEN ACROSS PORTIONS THE WARNING AREA OVERNIGHT AND 
EARLY THIS MORNING.  

EARLIER THIS MORNING...STATE POLICE REPORTED WATER AS HIGH AS THE 
HOOD OF A CAR IN THE LODA AREA.  

ALTHOUGH THREAT OF HEAVY RAINFALL RATES HAS ENDED...WATER LEVELS IN 
SMALL STREAMS AND CREEKS WILL CONTINUE TO RISE FOR SEVERAL MORE 
HOURS IN REPONSE TO RUNOFF.  IN ADDITION...THIS IS THE SAME AREA 
THAT RECEIVED EXCESSIVE RAINFALL EARLIER IN THE WEEK.  

ADDITIONAL LIGHT RAIN IS EXPECTED TO CONTINUE UNTIL ABOUT 11 AM 
BEFORE PRECIPITATION ENDS COMPLET

* SOME LOCATIONS AFFECTED INCLUDE...
  BUCKLEY...
  CISSNA PARK...
  LODA...
  PAXTON...

MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR
VEHICLE INTO AREAS IN WHICH WATER COVERS THE ROADWAY. IT ONLY TAKES
TWO FEET OF WATER TO WASH MOST VEHICLES AWAY INCLUDING SUVS AND
PICKUPS. VEHICLES CAUGHT IN RISING WATERS SHOULD BE ABANDONED
QUICKLY.

REPORT FLASH FLOODING TO YOUR NEAREST LAW ENFORCEMENT AGENCY...FOR 
RELAY TO THE NATIONAL WEATHER SERVICE. STAY TUNED FOR LATER 
STATEMENTS.

LAT...LON 4077 8760 4055 8759 4055 8806 4076 8805

MERZLOCK

NNNN

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 23, 2:59 AM CDTFlash Flood WarningLOTFord6 hr
Aug 23, 4:28 AM CDTFlash Flood WarningLOTIroquois6 hr
Aug 23, 9:15 AM CDTFlash Flood WarningLOTFord, Iroquois4 hr

Nearby

Flash Flood Warnings in Illinois, 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.