Alert archive / Illinois / Flash Flood Warnings in 2002

Flash Flood Warning 90, NWS Lincoln, IL

August 19, 2002Champaign County, Illinois

NWS Lincoln, IL issued this flash flood warning at Aug 19, 2002, 4:36 AM CDT for Champaign 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 19, 2002, 4:36 AM CDT (09:36 UTC)
Expired
Aug 19, 2002, 10:30 AM CDT
In force
6 hr
Issued by
NWS Lincoln, IL
Area
Counties, with a storm outline in the text

County Champaign County, IL

The radar

The Lincoln radar (KILX), 101 km from the middle of the area, began a volume at 09:37 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, 9.6 hours before the alert went out and 40 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 2002-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 523 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 00:00Z on 2002-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 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
523 J/kg
Mixed-layer CIN
-272 J/kg
Mixed-layer LCL
743 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
282 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 KILX 190936
FFWSPI
ILC019-191530-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
433 AM CDT MON AUG 19 2002

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN CHAMPAIGN COUNTY IN EAST CENTRAL ILLINOIS

* UNTIL 1030 AM CDT

* AT 427 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAINS CONTINUING OVER PARTS OF NORTHERN CHAMPAIGN COUNTY...
  ROUGHLY FROM JUST NORTH OF CHAMPAIGN TO GIFFORD. DOPPLER RAINFALL
  ESTIMATES RANGE FROM 2 TO 3 INCHES ACROSS THIS AREA SINCE 100 AM.

* THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL CONTINUE ACROSS
  THE NORTHERN HALF OF CHAMPAIGN COUNTY THROUGH 530 AM. ADDITIONAL
  RAINFALL RATES OF 1 TO 2 INCHES WILL BE POSSIBLE ACROSS THE
  AREA OVER THE NEXT SEVERAL HOURS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODS. IT IS VERY DIFFICULT AT NIGHT TO JUDGE HOW
MUCH WATER COVERS ROADWAYS. DO NOT ATTEMPT TO CROSS FLOODED ROADWAYS.

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

LAT...LON 4039 8796 4007 8796 4007 8846 4040 8845

SMITH
NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 12:20 AM CDTSevere Thunderstorm WarningILXMcLean40 min
Aug 19, 1:03 AM CDTSevere Thunderstorm WarningILXMcLean27 min
Aug 19, 2:03 AM CDTSevere Thunderstorm WarningILXVermilion42 min
Aug 19, 2:34 AM CDTFlash Flood WarningILXVermilion6 hr
Aug 19, 4:13 AM CDTSevere Thunderstorm WarningILXMason47 min
Aug 19, 5:32 AM CDTFlash Flood WarningILXChampaign, Vermilion6 hr
Aug 19, 5:32 AM CDTSevere Thunderstorm WarningILXSangamon58 min

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.