Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 67, NWS Twin Cities, MN

June 15, 1991Mower County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 15, 1991, 12:06 AM CDT for Mower County, Minnesota. It was in force for 39 min.

The area

The counties it named.

The facts

Issued
Jun 15, 1991, 12:06 AM CDT (05:06 UTC)
Expired
Jun 15, 1991, 12:45 AM CDT
In force
39 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Mower County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 5.1 hours before the alert went out and 147 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 1991-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 807 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 1991-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939Sfc1 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
807 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1047 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
125 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 150509
SVRRST
MNC099-150600-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
1206 AM CDT SAT JUN 15 1991
 
THE NATIONAL WEATHER SERVICE IN ROCHESTER MN HAS ISSUED A
SEVERE THUNDERSTORM WARNING     EFFECTIVE UNTIL  12 45 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST MINNESOTA
 
   ...MOWER COUNTY
 
A SEVERE THUNDERSTORM WAS INDICATED BY RADAR JUST SOUTHWEST OF
AUSTIN TO THE IOWA BORDER ABOUT 10 MILES SOUTH OF AUSTIN...NEAR
LYLE.
 
CITIES IN THE PATH OF THIS THUNDERSTORM INCLUDE LYLE AND AUSTIN.
 
 
 
 
WHEN THUNDERSTORMS ARE OCCURRING..MOVE INSIDE A STRONG BUILDING
DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES OR ELECTRICAL
APPLIANCES UNLESS IN AN EMERGENCY. REMEMBER SEVERE THUNDERSTORMS
CAN AND OCCASIONALLY DO PRODUCE TORNADOS WITH LITTLE OR NO WARNING.
 
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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 15, 1:39 AM CDTFlash Flood WarningMPXWabasha, Winona3 hr
Jun 15, 5:04 AM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Swift41 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.