Alert archive / Minnesota / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 26, NWS Grand Forks, ND

July 7, 1990Becker County, Otter Tail County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 7, 1990, 5:08 PM CDT for Becker County, Otter Tail County, Minnesota. It was in force for 37 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1990, 5:08 PM CDT (22:08 UTC)
Expired
Jul 7, 1990, 5:45 PM CDT
In force
37 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Becker County, MN, Otter Tail 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, 10.1 hours before the alert went out and 260 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 1990-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 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 12:00Z on 1990-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 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
24 J/kg
Mixed-layer CIN
-594 J/kg
Mixed-layer LCL
595 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
263 m²/s²
0-3 km storm-relative helicity
677 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 072208
SVRFAR
MNC005-027-107-111-072315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE FARGO ND
508 PM CDT SAT JUL 7 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 615 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE NORTHWEST PART OF MINNESOTA
      SOUTHERN BECKER...NORTHERN CLAY...SOUTHERN NORMAN...THE 
      CITY OF DETROIT LAKES...

   IN THE WEST CENTRAL PART OF MINNESOTA
      EXTREME NORTHERN OTTER TAIL...

AT 500 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES SOUTH-
WEST OF DETROIT LAKES MINNESOTA IN THE CITY OF COMMORANT AREA AND
ANOTHER SEVERE THUNDERSTORM 15 TO 30 MILES NORTH-NORTHEAST OF FARGO
IN THE GEORGETOWN AREA.  BOTH STORMS WERE MOVING EAST AT 35 MILES
AN HOUR.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION...MOVE T{O AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.

EWENS

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 7, 2:37 PM CDT, 2 hours 31 minutes before
NDZ012-013-014-015-016-017-018-MNZ001-006-007-010-011-013-072030-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
225 PM CDT SAT JUL 7 1990

...THUNDERSTORMS DEVELOPING RAPDILY OVER SOUTHEAST NORTH DAKOTA AND
NORTHEAST SOUTH DAKOTA...

AT 225 PM CDT A SMALL AREA OF SCATTERED THUNDERSTORMS HAD DEVELOPED
OVER SOUTHEAST NORTH DAKOTA AND NORTHEAST SOUTH DAKOTA. THESE
THUNDERSTORMS WERE LOCATED 30 MILES SOUTH OF FARGO NORTH DAKOTA
SOUTHWEST TO 20 MILES NORTHEAST OF ABERDEEN SOUTH DAKOTA. MOVEMENT
WAS TO THE EAST AT 20 MILES AN HOUR. THESE THUNDERSTORMS COULD
DEVELOP RAPIDLY AS THEY ARE IN AN AREA OF POTENTIALLY UNSTABLE AIR.

ANOTHER AREA OF THUNDERSTORMS CONTINUED OVER CENTRAL AND NORTHEAST
NORTH DAKOTA AND NORTHWEST MINNESOTA. THESE THUNDERSTORMS EXTENDED
FROM 50 MILES EAST OF THIEF RIVER FALLS MINNESOTA SOUTHWEST TO
JAMESTOWN NORTH DAKOTA AND WERE MOVING EAST AT 25 MILES AN HOUR.

SKIES REMAINED MOSTLY CLOUDY OVER EASTERN NORTH DAKOTA AND
NORTHWEST AND WEST CENTRAL MINNESOTA. WINDS WERE SHIFTING TO
THE EAST AT 10 TO 20 MILES AN HOUR AND TEMPERATURES HAD WARMED
INTO THE LOWER 80S OVER MUCH OF THE AREA.

A LOW PRESSURE SYSTEM OVER EASTERN SOUTH DAKOTA WAS MOVING EAST
AND WILL CONTINUE TO PUSH MOISTURE INTO THE RED RIVER VALLEY THIS
AFTERNOON.
ANDERSEN

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 7, 5:08 PM CDTSevere Thunderstorm WarningFGFClay, Norman52 min
Jul 7, 6:11 PM CDTSevere Thunderstorm WarningFGFBecker, Hubbard64 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1990Every severe thunderstorm 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.