Alert archive / Illinois / Flash Flood Warnings in 1997

Flash Flood Warning 7, NWS Lincoln, IL

August 17, 1997Champaign County, Illinois

NWS Lincoln, IL issued this flash flood warning at Aug 17, 1997, 3:45 AM CDT for Champaign 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 counties it named.

The facts

Issued
Aug 17, 1997, 3:45 AM CDT (08:45 UTC)
Expired
Aug 17, 1997, 7:30 AM CDT
In force
4 hr
Issued by
NWS Lincoln, IL
Area
Whole counties

County Champaign County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 8.8 hours before the alert went out and 34 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 1997-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5712 joules per kilogram.LCLEL10008507005003002001001 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 1997-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 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
5712 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
995 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
317 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 170847
FFWSPI
ILC019-115-147-171230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
345 AM CDT SUN AUG 17 1997

* FLASH FLOOD WARNING FOR
  CHAMPAIGN COUNTY IN EAST CENTRAL ILLINOIS
  MACON COUNTY IN CENTRAL ILLINOIS
  PIATT COUNTY IN EAST CENTRAL ILLINOIS

* UNTIL 730 AM CDT
 
* SOME AREAS AFFECTED
  DECATUR
  MONTICELLO
  CHAMPAIGN/URBANA
  TOLONO

* CAUSE AND EFFECT
  SHOWERS AND THUNDERSTORMS WITH HEAVY RAINFALL OF UP TO 3 INCHES
  WILL PRODUCE FLASH FLOODING. CHAMPAIGN COUNTY SHERIFF REPORTED
  VIADUCTS AND INTERSECTIONS FLOODED.

* FORECAST CONDITIONS
  HEAVY RAIN WILL CONTINUE TO MOVE ACROSS THE AREA THROUGH THE
  MORNING HOURS WITH RAINFALL RATES OF 1 INCH AN HOUR POSSIBLE.

MOVE TO HIGHER GROUND IMMEDIATELY IF FLOODWATERS THREATEN AND AVOID
DRIVING ACROSS FLOODED ROADS.

KETCHAM
 

&

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 8:30 PM CDTSevere Thunderstorm WarningILXKnox, Stark45 min
Aug 16, 9:15 PM CDTSevere Thunderstorm WarningILXKnox, Stark45 min
Aug 17, 1:17 AM CDTFlash Flood WarningILXMarshall, Woodford4 hr
Aug 17, 3:45 AM CDTFlash Flood WarningILXMacon, Piatt4 hr

Nearby

Flash Flood Warnings in Illinois, 1997Every flash flood warning in 1997

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.