Alert archive / Minnesota / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 140, NWS Twin Cities, MN

July 18, 1994Big Stone County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 1994, 8:18 AM CDT for Big Stone County, Minnesota. It was in force for 57 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1994, 8:18 AM CDT (13:18 UTC)
Expired
Jul 18, 1994, 9:15 AM CDT
In force
57 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Big Stone County, MN

The nearest sounding before it

Aberdeen, SD (KHON), launched 12:00Z, 1.3 hours before the alert went out and 167 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, Aberdeen, SD at 12:00Z on 1994-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1907 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, Aberdeen, SD at 12:00Z on 1994-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 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
1907 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
1147 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 181318 RRA
SVRSTC
MNC011-181415-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA
818 AM CDT MON JUL 18 1994
 
THE NATIONAL WEATHER SERVICE IN ST CLOUD MINNESOTA  HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL MINNESOTA
 
   ...BIG STONE COUNTY
 
AT 815 AM SHERIFFS DEPARTMENT REPORTED PEA TO MARBLE SIZE HAIL NEAR
CLINTON WHICH IS 60 MILES SOUTHWEST OF ALEXANDRIA. RADAR ALSO SHOWED
A SEVERE THUNDERSTORM NORTH OF ORTONVILLE MOVING SOUTHEAST AT 25 MPH.
THIS STORM WILL MOVE THROUGH ORTONVILLE AND CLINTON BY 830 AM AND INTO
ARTICHOKE AND CORRELL BY 900 AM.
 
 
IF OUTSIDE..FIND A STRONG BUILDING.  DO NOT SEEK SHELTER UNDER TREES.
STAY INDOORS AWAY FROM WINDOWS.  DO NOT USE ELECTRICAL APPLIANCES.
 
 
 
&
NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 12:31 PM CDTSevere Thunderstorm WarningMPXBig Stone59 min
Jul 18, 1:36 PM CDTSevere Thunderstorm WarningMPXLac qui Parle54 min
Jul 18, 2:06 PM CDTSevere Thunderstorm WarningMPXChippewa54 min
Jul 18, 2:18 PM CDTSevere Thunderstorm WarningMPXYellow Medicine57 min
Jul 18, 3:10 PM CDTSevere Thunderstorm WarningMPXRedwood65 min
Jul 18, 5:05 PM CDTSevere Thunderstorm WarningMPXMartin40 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1994Every severe thunderstorm warning in 1994

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.