Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 87, NWS Twin Cities, MN

June 28, 1991Morrison County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 28, 1991, 7:38 PM CDT for Morrison County, Minnesota. It was in force for 37 min.

The area

The counties it named.

The facts

Issued
Jun 28, 1991, 7:38 PM CDT (00:38 UTC)
Expired
Jun 28, 1991, 8:15 PM CDT
In force
37 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Morrison County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 0.6 hours before the alert went out and 139 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 1991-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3476 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 1991-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 385 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
3476 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
385 m²/s²
0-3 km storm-relative helicity
583 m²/s²
Significant tornado parameter
11.6
Supercell composite
41.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 290038
SVRSTC
MNC097-290115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA
738 PM CDT FRI JUN 28 1991
 
THE NATIONAL WEATHER SERVICE IN ST CLOUD MINNESOTA   HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  815 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL MINNESOTA
 
   ...NORTHERN MORRISON COUNTY
 
INCLUDING THE CITIES OF FORT RIPLEY..PILLAGER AND CUSHING.
 
AT 730 PM CDT A SEVERE THUNDERSTORM WAS LOCATED NEAR STAPLES
WHICH IS 30 MILES WEST OF BRAINERD. THIS STORM WAS MOVING EAST
AT 40 MPH AT WILL AFFECT CUSHING AND PILLAGER AROUNMD 745 PM
AND FORT RIPLEY AROUND 800 PM CDT.
 
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
 
NNNN

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, Jun 28, 6:58 PM CDT, 40 minutes before
MNZ016-012-WIZ006-290100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
655 PM CDT FRI JUN 28 1991

...STRONG THUNDERSTORMS BUILDING ACROSS EAST CENTRAL MINNESOTA AND
NORTHWEST WISCONSIN...

STRONG THUNDERSTORMS HAVE CONTINUED TO DEVELOPE NORTH AND NORTHEAST
OF THE TWIN CITIES ACROSS PARTS OF ISANTI AND CHISAGO COUNTIES OF EASTERN
MINNESOTA INTO POLK AND BURNETT COUNTIES OF NORTHWEST WISCONSIN.

THESE STRONG THUNDERSTORMS WERE LOCATED FROM AROUND RUSH CITY AND
CAMBRIDGE TO NEAR TAYLORS FALLS ON THE MINNESOTA SIDE OF THE ST CROIX
RIVER AND FROM CUSHING TO BALSAM LAKE IN ADJACENT WISCONSIN.

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING FREQUENT LIGHTNING STRIKES...
STRONG GUSTY WINDS AS WELL AS LOCALLLY VERY HEAVY RAINS AS THEY MOVE
TO THE NORTHEAST AT AROUND 30 MILES AN HOUR.
<
A TORNADO WATCH IS IN EFFECT FOR A PORTION OF EAST CENTRAL MINNESOTA
INTO MUCH OF NORTHWEST WISCONSIN UNTIL MIDNIGHT.
SWANBERG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 8:38 PM CDTSevere Thunderstorm WarningMPXMille Lacs52 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1991Every severe thunderstorm warning in 1991

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.