Alert archive / Illinois / Flash Flood Warnings in 1986

Flash Flood Warning 8, NWS Quad Cities, IA

September 21, 1986Jo Daviess County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Sep 21, 1986, 3:39 AM CDT for Jo Daviess County, Illinois. It was in force for 66 min.

The area

The counties it named.

The facts

Issued
Sep 21, 1986, 3:39 AM CDT (08:39 UTC)
Expired
Sep 21, 1986, 4:45 AM CDT
In force
66 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Jo Daviess County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 00:00Z, 8.7 hours before the alert went out and 195 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, Peoria Regional, IL at 00:00Z on 1986-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 joules per kilogram.LCLLFCEL10008507005003002001001 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, Peoria Regional, IL at 00:00Z on 1986-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 143 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
14 J/kg
Mixed-layer CIN
-367 J/kg
Mixed-layer LCL
1260 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
143 m²/s²
0-3 km storm-relative helicity
286 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 KRFD 210839
FFWRFD
ILC085-210945-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ROCKFORD IL
339 AM CDT SUN SEP 21 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 445 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHWEST ILLINOIS...JO-DAVIESS

 AT 335 AM CDT THE JO DAVIESS COUNTY SHERIFFS OFFICE REPORTS
 RAPID RISES ON ALL SMALL STREAMS.. ESPECIALLY IN THE WESTERN
 PART OF THE COUNTY.  WATER WAS COVERING MANY ROADS IN IN THE
 COUNTY WITH 3 TO 3.50 INCHES OF RAIN BEING REPORTED IN THE
 THE GALENA ILLINOIS AREA SINCE MIDNIGHT.  STRONG THUNDERSTORMS
 CONTINUE TO DEVELOP IN EASTERN IOWA AND ARE MOVING SLOWLY EAST.
 THIS WILL CONTINUE RAINFALL IN JO DAVIESS COUNTY FOR AT LEAST THE
 NEXT TWO OR THREE HOURS INCREASING THE FLOOD THREAT.

 SOME COMMUNITIES ARE IN OR NEAR THE FLASH FLOOD AREA...
 GALENA.. ELIZABETH.. HANOVER.. STOCKTON.. SCALES MOUND AND
 APPLE RIVER.

 A FLASH FLOOD WARNING MEANS THAT FLOODING IS AN IMMEDIATE THREAT!
 PERSON IN LOW LYING OR FLOOD PRONE AREAS MOVE TO HIGHER GROUND.
 IF YOU ARE IN AREAS WHERE YOU ARE NOT FAMILIAR.. BE EXTREMELY
 CAUTIOUS AND CONSIDER HEADING FOR HIGHER GROUND.  IF CAMPING OR
 IN A CAR WATCH FOR RAPIDLY RISING WATER THAT MAY ENDANGER YOUR
 CAMPSITE OR CUT OFF ESCAPE ROUTES.  DO NOT CROSS ROADS COVERED BY
 WATER.. THE ROAD MAY BE WASHED OUT OR THE WATER MUCH DEEPER THAN
 YOU THINK!  REMEMBER FLASH FLOODS HAPPEN RAPIDLY.. SO BE ALERT!

 ATTN:ISP DIST 16
 PIERCE

Nearby

Flash Flood Warnings in Illinois, 1986Every flash flood warning in 1986

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.