Alert archive / Wisconsin / Flash Flood Warnings in 1990

Flash Flood Warning 9, NWS Green Bay, WI

August 17, 1990Iowa County, Wisconsin

NWS Green Bay, WI issued this flash flood warning at Aug 17, 1990, 11:15 PM CDT for Iowa County, Wisconsin. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 17, 1990, 11:15 PM CDT (04:15 UTC)
Expired
Aug 18, 1990, 2:15 AM CDT
In force
3 hr
Issued by
NWS Green Bay, WI
Area
Whole counties

County Iowa County, WI

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, 4.3 hours before the alert went out and 232 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 1990-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 729 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 1990-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.1939Sfc1 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
729 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
740 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
47 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 KMSN 180415
FFWMSN
WIC049-180715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING 
NATIONAL WEATHER SERVICE MADISON WI
1115 PM CDT FRI AUG 17 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 215 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE SOUTH CENTRAL PART OF WISCONSIN
      EASTERN IOWA

AT 1105 PM CDT HAM OPERATOR REPORTS ROADS FLOODED AT COBB IN
EASTERN IOWA COUNTY. RADAR INDICATES A NEARLY STATIONARY AREA
OF THUNDERSTORMS IN THAT AREA AND VERY HEAVY RAINS CAN BE EXPECTED
TO CONTINUE FOR THE NEXT FEW HOURS.

A FLASH FLOOD WARNING MEANS FLOODING IS OCCURRING OR IS IMMINENT.
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY.
NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT.
TO ESCAPE RISING WATER MOVE TO HIGHER GROUND.

PRZEKURAT

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 9:10 PM CDTSevere Thunderstorm WarningGRBIowa, Richland, Sauk65 min
Aug 17, 11:58 PM CDTFlash Flood WarningGRBIowa6 hr
Aug 18, 5:57 PM CDTTornado WarningGRBAdams, Juneau63 min
Aug 18, 6:23 PM CDTTornado WarningGRBGreen Lake, Marquette, Waushara67 min

Nearby

Flash Flood Warnings in Wisconsin, 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.