Alert archive / Minnesota / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 60, NWS Twin Cities, MN

July 31, 1993Blue Earth County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 31, 1993, 3:33 AM CDT for Blue Earth County, Watonwan County, Minnesota. It was in force for 27 min.

The area

The counties it named.

The facts

Issued
Jul 31, 1993, 3:33 AM CDT (08:33 UTC)
Expired
Jul 31, 1993, 4:00 AM CDT
In force
27 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Blue Earth County, MN, Watonwan County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 8.6 hours before the alert went out and 111 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 1993-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1153 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 1993-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 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
1153 J/kg
Mixed-layer CIN
-243 J/kg
Mixed-layer LCL
1041 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
246 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 310833 RRA
SVRRST
MNC013-165-310900-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
333 AM CDT SAT JUL 31 1993
 
THE NATIONAL WEATHER SERVICE IN ROCHESTER MN HAS ISSUED A
SEVERE THUNDERSTORM WARNING     EFFECTIVE UNTIL  400 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL MINNESOTA
 
   ...BLUE EARTH COUNTY...EASTERN WATONWAN COUNTY
 
AT 320 AM RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES EAST OF
LEWISVILLE OR 18 MILES NORTH OF FAIRMONT IN WATONWAN COUNTY.
THIS STORM WAS MOVING TO THE EAST AT 25 MPH AND WILL AFFECT THE
TOWNS OF AMBOY...VERNON CENTER AND STERLING CENTER BY 345 AM.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIPND...LARGE HAIL...
DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR PROTECTION
MOVE TO AN INTERIOR ROOM.  PEOPLE IN MOBILE HOMES SHOULD GO
TO A STORM SHELTER.
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 4:31 AM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn29 min
Jul 31, 4:31 AM CDTSevere Thunderstorm WarningMPXBlue Earth29 min
Jul 31, 5:24 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Le Sueur, Nicollet36 min
Jul 31, 5:43 AM CDTSevere Thunderstorm WarningMPXDodge, Mower32 min
Jul 31, 8:20 AM CDTSevere Thunderstorm WarningMPXMcLeod, Renville, Sibley55 min
Jul 31, 8:34 AM CDTSevere Thunderstorm WarningMPXBrown, Nicollet26 min
Jul 31, 9:14 AM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Wright61 min
Jul 31, 9:14 AM CDTSevere Thunderstorm WarningMPXMeeker46 min
Jul 31, 9:40 AM CDTSevere Thunderstorm WarningMPXSherburne50 min
Jul 31, 9:49 AM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Scott43 min
Jul 31, 9:50 AM CDTSevere Thunderstorm WarningMPXSteele30 min
Jul 31, 10:01 AM CDTSevere Thunderstorm WarningMPXAnoka, Chisago, Ramsey, Washington59 min
Jul 31, 10:03 AM CDTSevere Thunderstorm WarningMPXMeeker57 min
Jul 31, 10:20 AM CDTSevere Thunderstorm WarningMPXSherburne55 min
Jul 31, 10:27 AM CDTSevere Thunderstorm WarningMPXStearns63 min
Jul 31, 10:38 AM CDTSevere Thunderstorm WarningMPXMorrison52 min
Jul 31, 11:29 AM CDTSevere Thunderstorm WarningMPXStearns61 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1993Every severe thunderstorm warning in 1993

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.