Alert archive / Illinois / Flash Flood Warnings in 1990

Flash Flood Warning 39, NWS Lincoln, IL

July 19, 1990Carroll County, Illinois

NWS Lincoln, IL issued this flash flood warning at Jul 19, 1990, 8:12 PM CDT for Carroll County, Illinois. It was in force for 108 min.

The area

The counties it named.

The facts

Issued
Jul 19, 1990, 8:12 PM CDT (01:12 UTC)
Expired
Jul 19, 1990, 10:00 PM CDT
In force
108 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Carroll 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 1.2 hours before the alert went out and 306 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, Green Bay/Straub, WI at 00:00Z on 1990-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 228 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, Green Bay/Straub, WI at 00:00Z on 1990-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.19395878Sfc1 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
228 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
769 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRFD 200112
FFWRFD
ILC177-015-201-007-141-103-200415-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING 
NATIONAL WEATHER SERVICE ROCKFORD IL
812 PM CDT THU JUL 19 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 1115 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE NORTH CENTRAL PART OF ILLINOIS
      STEPHENSON...WINNEBAGO...BOONE...OGLE...LEE...

   IN THE NORTHWEST PART OF ILLINOIS
      CARROLL...

NUMEROUS SHOWERS AND THUNDERSTORMS CONTINUE OVER NORTH CENTRAL
ILLINOIS...AND WERE FORMING/MOVING BACK INTO NORTHWEST ILLINOIS
THIS EVENING AT 810 CDT. THE GROUNDS ARE SATURATED IN THE WARNED
COUNTIES AND ANY ADDITIONAL RAIN WILL BE RUNOFF.

SOME COMMUNITIES THAT ARE IN OR NEAR THE FLASH FLOOD AREA...
FREEPORT..ROCKFORD..BELVIDERE..MT CARROLL..OREGON..AND DIXON.

THIS FLOOD WARNING MEANS THAT FLOODING IS AN IMMEDIATED THREAT!
PERSONS 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 THESE FLOODS HAPPEN RAPIDLY... BE ALERT!

ATTN: ISP DIST [1..2..16                                FIELDS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 8:12 PM CDTFlash Flood WarningILXBoone, Ogle, Stephenson, Winnebago108 min
Jul 19, 8:12 PM CDTFlash Flood WarningILXLee108 min
Jul 20, 5:50 PM CDTSevere Thunderstorm WarningILXClark55 min

Nearby

Flash Flood Warnings in Illinois, 1990Every flash flood warning in 1990

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.