Alert archive / Minnesota / Flash Flood Warnings in 1990

Flash Flood Warning 13, NWS Twin Cities, MN

July 26, 1990Hennepin County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Jul 26, 1990, 6:41 AM CDT for Hennepin County, Minnesota. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 26, 1990, 6:41 AM CDT (11:41 UTC)
Expired
Jul 26, 1990, 9:45 AM CDT
In force
3 hr
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Hennepin 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 00:00Z, 11.7 hours before the alert went out and 20 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 00:00Z on 1990-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 32 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, Minneapolis, MN at 00:00Z on 1990-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
32 J/kg
Mixed-layer CIN
-193 J/kg
Mixed-layer LCL
1067 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
46 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 KMSP 261147
FFWMSP
MNC053-261445-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
641 AM CDT THU JUL 26 1990

THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  945 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...

IN EAST CENTRAL MINNESOTA
          ...HENNEPIN

HEAVY RAIN CONTINUES THIS MORNING OVER THE TWIN CITIES WITH LIMITED
REPORTS OF 2 TO 3 INCHES IN THE SOUTHWEST AND WEST SUBURBS SINCE
MIDNIGHT. CONSIDERABLE UNDERPASS AND APPROACH RAMP FLOODING IS HIGHLY
PROBABLE WITH THE RAINFALL RATES OBSERVED OVER THE PAST 2 HOURS.
THE GREATEST DANGER IS TO MOTORISTS ATTEMPTING TO DRIVE THROUGH
FLOODED ROADWAYS AND NOT BEING AWARE OF THE WATER DEPTH. DROWNINGS
OCCUR UNDER THESE CONDITIONS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

MOST DEATHS IN FLASH FLOODING 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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THRE4ATENING RAINS.
TOGSTAD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 26, 3:25 AM CDTFlash Flood WarningMPXRedwood, Renville3 hr
Jul 26, 7:23 AM CDTFlash Flood WarningMPXAnoka, Ramsey, Washington102 min
Jul 26, 7:23 AM CDTFlash Flood WarningMPXChisago102 min
Jul 26, 7:23 AM CDTFlash Flood WarningMPXCarver102 min

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.