Alert archive / Minnesota / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 21, NWS Grand Forks, ND

June 20, 1994Douglas County, Grant County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 20, 1994, 3:51 AM CDT for Douglas County, Grant County, Minnesota. It was in force for 69 min.

The area

The counties it named.

The facts

Issued
Jun 20, 1994, 3:51 AM CDT (08:51 UTC)
Expired
Jun 20, 1994, 5:00 AM CDT
In force
69 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Douglas County, MN, Grant County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 8.9 hours before the alert went out and 206 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 1994-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2615 joules per kilogram.LCLEL10008507005003002001001 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 1994-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
2615 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

000 
WUUS1 KFAR 200851 RRA
SVRFAR
MNC041-051-201000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE FARGO ND
351 AM CDT MON JUN 20 1994

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 500 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE WEST CENTRAL PART OF MINNESOTA
      SOUTHERN DOUGLAS...SOUTHERN GRANT...THE CITY OF ALEXANDRIA

AT 345 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WAS LOCATED
OVER SOUTHWESTERN GRANT COUNTY NEAR THE CITY OF HERMAN...35 MILES
WEST OF ALEXANDRIA.  MOVEMENT IS TO THE EAST AT 35 MILES PER HOUR.
THIS SEVERE THUNDERSTORM WILL BE IN THE ALEXANDRIA AREA BY 445 AM
CDT.

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

JEURISSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 7:45 PM CDTSevere Thunderstorm WarningFGFWilkin60 min
Jun 19, 7:45 PM CDTSevere Thunderstorm WarningFGFClay20 min
Jun 19, 8:21 PM CDTSevere Thunderstorm WarningFGFBecker, Otter Tail69 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1994Every severe thunderstorm warning in 1994

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.