Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 123, NWS Twin Cities, MN

August 22, 1991Martin County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 22, 1991, 11:37 PM CDT for Martin County, Watonwan County, Minnesota. It was in force for 53 min.

The area

The counties it named.

The facts

Issued
Aug 22, 1991, 11:37 PM CDT (04:37 UTC)
Expired
Aug 23, 1991, 12:30 AM CDT
In force
53 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Martin County, MN, Watonwan County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 4.6 hours before the alert went out and 138 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 1991-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1991-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2062 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
94 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 KRST 230438
SVRRST
MNC091-165-230530-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
1137 PM CDT THU AUG 22 1991
 
THE NATIONAL WEATHER SERVICE IN ROCHESTER MN HAS ISSUED A
SEVERE THUNDERSTORM WARNING     EFFECTIVE UNTIL 1230 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL MINNESOTA
 
   ...NORTHERN MARTIN COUNTY...WATONWAN COUNTY
 
THIS WARNING INCLUDES THE TOWNS OF BUTTERFIELD...ST.JAMES...
TRIMONT...AND TRUMAN MINNESOTA.
 
AT 1115 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
30 TO 35 MILES SOUTH OF REDWOOD FALLS MINNESOTA.  THE STORMS
WERE MOVING EAST AT 30 MPH INTO WATONWAN AND MARTIN COUNTIES
OF SOUTH CENTRAL MINNESOTA AND WILL REACH THE TOWNS OF
BUTTERFIELD BY 1140 PM CDT AND REACH TRIMONT...TRUMAN...AND
ST. JAMES BY 1215 AM CDT.
 
IF YOU ARE IN THE PATH OF THESE STORMS GO TO A SAFE REINFORCED
BUILDING...OR TO YOUR BASEMENT IMMEDIATELY.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
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.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T` DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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.