Alert archive / Minnesota / Flash Flood Warnings in 1990

Flash Flood Warning 22, NWS Twin Cities, MN

July 28, 1990Dakota County, Ramsey County, Washington County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Jul 28, 1990, 6:43 PM CDT for Dakota County, Ramsey County, Washington County, Minnesota. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Jul 28, 1990, 6:43 PM CDT (23:43 UTC)
Expired
Jul 28, 1990, 7:25 PM CDT
In force
42 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Dakota County, MN, Ramsey County, MN, Washington 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, 11.7 hours before the alert went out and 46 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 1990-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 1990-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
31 J/kg
Mixed-layer CIN
-254 J/kg
Mixed-layer LCL
668 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
51 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 282345
FFWMSP
MNC037-123-163-290145-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
643 PM CDT SAT JUL 28 1990
 
THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  845 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN EAST CENTRAL MINNESOTA
          ...NORTHERN DAKOTA...EASTERN RAMSEY...SOUTHERN WASHINGTON
 
A NEARLY STATIONARY THUNDERSTORM IS DUMPING HEAVY RAIN OVER INVER
GROVE HEIGHTS..EAGAN AND APPLE VALLEY IN DAKOTA COUNTY THIS SATURDAY
EVENING. ALTHOUGH NO REPORTS HAVE BEEN RECEIVED..RADAR INTENSITY
SUGGESTS 1 TO 2 INCH PER HOUR RAINFALL RATES WHICH WILL FLOOD ROADWAYS
UNDERPASSES AND OTHER LOW LYING AREAS.
 
THIS IS A DANGEROUS SITUATION AS LITTLE INDICATION OF THUNDERSTORM
MOVEMENT CAN BE DETECTED. THE POTENTIAL FOR 3 TO 6 INCHES OF RAIN
EXITS OVER THE NEXT 2 TO 3 HOURS IF CONDITIONS PERSIST.
 
 
 
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.
 
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 THREATENING RAINS.
TOGSTAD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 7:27 PM CDTFlash Flood WarningMPXBlue Earth, Brown, Nicollet2 hr
Jul 27, 9:17 PM CDTFlash Flood WarningMPXMcLeod, Renville, Sibley73 min
Jul 27, 9:28 PM CDTFlash Flood WarningMPXBlue Earth, Brown, Nicollet2 hr
Jul 28, 1:59 AM CDTFlash Flood WarningMPXFillmore, Houston, Winona2 hr
Jul 28, 1:59 AM CDTFlash Flood WarningMPXOlmsted2 hr
Jul 28, 6:19 PM CDTSevere Thunderstorm WarningMPXBrown41 min
Jul 28, 6:53 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Nicollet37 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.