Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 121, NWS Twin Cities, MN

August 15, 1991Redwood County, Renville County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 15, 1991, 1:39 PM CDT for Redwood County, Renville County, Minnesota. It was in force for 51 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 15, 1991, 1:39 PM CDT (18:39 UTC)
Expired
Aug 15, 1991, 2:30 PM CDT
In force
51 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Redwood County, MN, Renville County, MN

What was reported inside it

TimeReportWhereRemark
Aug 15, 2:00 PM CDTHail 1.5Renville, MN
Aug 15, 2:25 PM CDTHail 0.75Renville, MN
Aug 15, 2:25 PM CDTHail 1Renville, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 6.7 hours before the alert went out and 123 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 1991-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 38 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 1991-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
38 J/kg
Mixed-layer CIN
-172 J/kg
Mixed-layer LCL
1498 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
83 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 KMSP 151833
SVRMSP
MNC129-127-151930-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
139 PM CDT THU AUG 15 1991
 
THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING     EFFECTIVE UNTIL  230 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN CENTRAL MINNESOTA
 
   ...RENVILLE COUNTY
 
IN SOUTHWEST MINNESOTA
 
   ...REDWOOD COUNTY
 
AT 1 30 PM...RADAR INDICATED A SEVERE THUNDERSTORM SOUTH OF SACRED
HEART...20 MILES NORTHWEST OF REDWOOD FALLS. THE STORM  WAS MOVING
SOUTHEAST AT 20 MILES AN HOUR.
 
COMMUNITIES IN THE PATH OF THE STORM ARE REDWOOD FALLS AND MORTON...
ALONG THE MINNESOTA RIVER.
 
AT 1 00 PM...DIME SIZE HAIL WAS REPORTED WITH THIS STORM AT GRANITE
FALLS.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEUST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
DWE

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.