Alert archive / Illinois / Flash Flood Warnings in 1997

Flash Flood Warning 9, NWS Quad Cities, IA

February 21, 1997Henry County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Feb 21, 1997, 12:13 AM CST for Henry County, Illinois. It was in force for 12 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: Feb 21, 1997, 12:13 AM CST (06:13 UTC)
Expired: Feb 21, 1997, 12:00 PM CST
In force: 12 hr
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Henry County, IL

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.2 hours before the alert went out and 43 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 489 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 69 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 KMLI 210615
FFWMLI
IAC031-045-097-105-139-163-061-057-087-111-115-177-
ILC011-155-177-015-073-085-131-161-195-067-071-109-187-211800-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING                            
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1213 AM CST FRI FEB 21 1997
  
THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A
FLOOD WARNING
EFFECTIVE UNTIL NOON CST FRIDAY 
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN EAST CENTRAL IOWA

   ...CEDAR COUNTY...CLINTON COUNTY...JACKSON COUNTY
   ...JONES COUNTY...MUSCATINE COUNTY...SCOTT COUNTY

IN NORTHEAST IOWA

   ...DUBUQUE COUNTY

IN SOUTHEAST IOWA

   ...DES MOINES COUNTY...HENRY COUNTY...LEE COUNTY
   ...LOUISA COUNTY...VAN BUREN COUNTY


IN NORTH CENTRAL ILLINOIS

   ...BUREAU COUNTY...PUTNAM COUNTY...STEPHENSON COUNTY

IN NORTHWEST ILLINOIS

   ...CARROLL COUNTY...HENRY COUNTY...JO DAVIESS COUNTY
   ...MERCER COUNTY...ROCK ISLAND COUNTY...WHITESIDE COUNTY

IN WEST CENTRAL ILLINOIS

   ...HANCOCK COUNTY...HENDERSON COUNTY...MCDONOUGH COUNTY
   ...WARREN COUNTY
 
A LARGE SLOW MOVING SHIELD OF MODERATE TO HEAVY RAINFALL HAS PRODUCED
BETWEEN ONE AND TWO INCHES OF RAINFALL SINCE 6PM CST YESTERDAY EVENING.
DOPPLER RADAR ESTIMATES INDICATE THE HEAVIEST RAIN HAS FALLEN FROM NEAR
FAIRFIELD TO BURLINGTON IOWA. THE GROUND HAS BECOME SATURATED AND
STREAMS ARE BANKFULL ACROSS MOST OF THE AREA.

THE SHERIFF/S OFFICE IN CARTHAGE... HANCOCK COUNTY... HAS REPORTED
STANDING WATER SEVERAL INCHES DEEP ON SOME SECONDARY ROADS. SPOTTERS IN
THE QUAD CITIES ALSO REPORTED MANY STREAMS AND CREEKS AT OR ABOVE
BANKFULL. THE 110TH AVENUE GAUGE ON DUCK CREEK READ 16.25 FEET AT 1155
PM. FLOOD STAGE AT 110TH AVENUE ON DUCK CREEK IS 14 FEET. IN ADDITION...
THE BIG AND LITTLE ELKHORN CREEKS... AND THE MUD CREEK IN WESTERN SCOTT
COUNTY WERE REPORTED OUT OF THEIR BANKS.

WEATHER SERVICE RADAR INDICATES ADDITIONAL HEAVY RAINS MOVING INTO THE
AREA FROM THE SOUTHWEST. ADDITIONAL RAINFALL OF AN INCH OR TWO IS
LIKELY IN THE NEXT 12 HOURS... WITH HIGHER AMOUNTS LOCALLY IN
THUNDERSTORMS.

CREEKS WILL RISE WELL OUT OF THEIR BANKS ACROSS MUCH OF THE AREA DURING
THE NEXT 12 HOURS. MANY AREA RIVERS ALREADY AT OR OUT OF THEIR BANKS
DUE TO RECENT SNOWMELT WILL RISE EVEN HIGHER DUE TO THE ADDITIONAL HEAVY
RAINFALL EXPECTED THROUGH NOON FRIDAY.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGER OF FLOODING.

HENDRICKS

&

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 21, 12:13 AM CST	Flash Flood Warning	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	12 hr
Feb 21, 12:13 AM CST	Flash Flood Warning	DVN	Bureau, Putnam	12 hr
Feb 21, 12:13 AM CST	Flash Flood Warning	DVN	Mercer, Rock Island	12 hr
Feb 21, 12:13 AM CST	Flash Flood Warning	DVN	Henderson, McDonough, Warren	12 hr
Feb 21, 12:13 AM CST	Flash Flood Warning	DVN	Hancock	12 hr

Nearby

Flash Flood Warnings in Illinois, 1997 Every 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.