Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 111, NWS Twin Cities, MN

July 18, 1991Todd County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 1991, 4:48 PM CDT for Todd County, Minnesota. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1991, 4:48 PM CDT (21:48 UTC)
Expired
Jul 18, 1991, 5:30 PM CDT
In force
42 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Todd County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 9.8 hours before the alert went out and 169 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 1991-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 635 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 1991-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 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
635 J/kg
Mixed-layer CIN
-382 J/kg
Mixed-layer LCL
1213 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
270 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 182148
SVRSTC
MNC153-182230-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA
448 PM CDT THU JUL 18 1991
 
THE NATIONAL WEATHER SERVICE IN ST CLOUD MINNESOTA   HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  530 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL MINNESOTA
 
   ...NORTHWESTERN TODD COUNTY
 
AT 4 45 PM CDT RADAR INDICATED A SEVERE THUNDERSTOM 25 MILES NORTH
NORTHEAST OF ALEXANDRIA MINNESOTA. THIS THUNDERSTORM WAS MOVING
NORTHEAST AT 40 MPH.
 
TOWNS IN THE PATH OF THIS THUNDERSTORM ARE EAGLE BEND...BERTHA
...STAPLES  AND CLARISSA. THIS STORM WILL BE IN EAGLE BEND AND
CLARISSA BY JUST AFTER 5 PM AND MOVE THROUGH BERTHA AND STAPLES
BETWEEN 5 15 AND 5 30 PM CDT.
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
 
NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 7:29 PM CDTSevere Thunderstorm WarningMPXPope, Stearns53 min
Jul 17, 8:10 PM CDTSevere Thunderstorm WarningMPXChippewa, Yellow Medicine35 min
Jul 17, 8:27 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville48 min
Jul 17, 9:07 PM CDTSevere Thunderstorm WarningMPXRenville53 min
Jul 17, 9:54 PM CDTSevere Thunderstorm WarningMPXRenville24 min
Jul 17, 9:54 PM CDTSevere Thunderstorm WarningMPXMcLeod, Sibley36 min
Jul 17, 10:29 PM CDTSevere Thunderstorm WarningMPXSibley31 min
Jul 17, 10:34 PM CDTSevere Thunderstorm WarningMPXNicollet41 min
Jul 18, 5:16 PM CDTSevere Thunderstorm WarningMPXPope44 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.