Alert archive / Minnesota / Flash Flood Warnings in 1990

Flash Flood Warning 25, NWS Twin Cities, MN

August 18, 1990Winona County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Aug 18, 1990, 6:26 PM CDT for Winona County, Minnesota. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 18, 1990, 6:26 PM CDT (23:26 UTC)
Expired
Aug 18, 1990, 8:45 PM CDT
In force
2 hr
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Winona County, MN

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

Minneapolis, MN (KSTC), launched 12:00Z, 11.4 hours before the alert went out and 174 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, Minneapolis, MN at 12:00Z on 1990-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Minneapolis, MN at 12:00Z on 1990-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
595 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
115 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 KRST 182327
FFWRST
MNC169-190145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
626 PM CDT SAT AUG 18 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE SOUTHEAST PART OF MINNESOTA
      SOUTHERN WINONA

THIS WARNING INCLUDES THE COMMUNITIES OF ST CHARLES...FREEMONT...
PICKWICK...AND DRESBACH.

TORRENTIAL RAINS HAVE BEEN FALLING ACROSS SOUTHERN WINONA COUNTY
LATE THIS AFTERNOON...AND ARE THUNDERSTORMS WITH VERY HEAVY RAINS
WILL CONTINUE TO MOVE ACROSS THIS AREA INTO THIS EVENING.  AT 6 00
PM...2.8 INCHES OF RAINFALL WAS REPORTED NEAR PICKWICK.
WEATHER SERVICE RADAR SHOW AN INCREASING AREA OF THUNDERSTORMS...
SOME WITH VERY HEAVY RAINS FROM NORTH OF AUSTIN...EASTWARD ACROSS
SOUTHERN OLMSTED AND WINONA COUNTIES...AND ACROSS NORTHERN MOWER...
FILLMORE AND HOUSTON COUNTIES.  PERSONS IN THESE AREAS SHOULD REMAIN
ALERT FOR POSSIBLE WARNINGS SHOULD THE HEAVY RAINS CONTINUE.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER
TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH
FLOODING IS OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD
WATERS.  DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER
BEGINS RISING.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.
DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER
COVERS THE ROADWAY.

  DOM

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 11:31 PM CDTFlash Flood WarningMPXKandiyohi, Meeker, Stearns3 hr

Nearby

Flash Flood Warnings in Minnesota, 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.