Alert archive / Illinois / Flash Flood Warnings in 2002

Flash Flood Warning 2, NWS Quad Cities, IA

May 11, 2002Hancock County, Illinois

NWS Quad Cities, IA issued this flash flood warning at May 11, 2002, 10:24 PM CDT for Hancock County, Illinois. It was in force for 5 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
May 11, 2002, 10:24 PM CDT (03:24 UTC)
Expired
May 12, 2002, 3:30 AM CDT
In force
5 hr
Issued by
NWS Quad Cities, IA
Area
Counties, with a storm outline in the text

County Hancock County, IL

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.4 hours before the alert went out and 140 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, Davenport, at 00:00Z on 2002-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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, Davenport, at 00:00Z on 2002-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 556 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
424 m above ground
0-6 km bulk shear
80 kt
0-1 km storm-relative helicity
556 m²/s²
0-3 km storm-relative helicity
666 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KDVN 120324
FFWMLI
ILC067-120830-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1022 PM CDT SAT MAY 11 2002

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HANCOCK COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 330 AM CDT

* AT 1012 PM CDT...LOCAL LAW ENFORCEMENT REPORTED SOME SECONDARY 
ROADS IN THE COUNTY ALREADY WATER COVERED. HIGHWAY 9 EAST OF LA 
HARPE WAS ALSO EXPERIENCING WATER OVER THE ROADWAY. THUNDERSTORMS   
PRODUCING VERY HEAVY RAIN WERE CURRENTLY MOVING OVER THE WARNED 
AREA...WITH ADDITIONAL HEAVY RAIN PRODUCING STORMS HEADED TOWARD THE 
WARNED AREA OUT OF MISSOURI. THESE ADDITIONAL STORMS WILL AGGRAVATE 
ONGOING FLOODING SITUATIONS...OR EVEN CREATE NEW ONES.

* THE GROUND HAS ALREADY BEEN SATURATED BY RECENT RAINFALL...
  ADDITIONAL HEAVY RAIN HAS RESULTED IN EXCESSIVE RUNOFF...LEADING
  THE LIKELIHOOD OF FLASH FLOODING IN THE WARNED AREA.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...
QUICKLY MOVE TO HIGHER GROUND TO ESCAPE FLOOD WATERS.

DO NOT DRIVE YOUR VEHICLE INTO WATER COVERED ROADWAYS. THE WATER MAY
BE TOO DEEP TO CROSS SAFELY OR THE ROAD COULD BE WASHED OUT. VEHICLES
CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

LAT...LON 4060 9096 4022 9096 4022 9146 4060 9127

JDH

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 11:09 PM CDTFlash Flood WarningDVNHenderson, Warren4 hr
May 11, 11:44 PM CDTFlash Flood WarningDVNMcDonough6 hr
May 12, 2:16 AM CDTFlash Flood WarningDVNHancock, Henderson, McDonough, Warren8 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.