Alert archive / Minnesota / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 141, NWS Twin Cities, MN

July 18, 1994Big Stone County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 1994, 12:31 PM CDT for Big Stone County, Minnesota. It was in force for 59 min.

The area

The counties it named.

The facts

Issued: Jul 18, 1994, 12:31 PM CDT (17:31 UTC)
Expired: Jul 18, 1994, 1:30 PM CDT
In force: 59 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, 5.5 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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 
WUUS1 KSTC 181731 RRA
SVRSTC
MNC011-181830-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA
1231 PM CDT MON JUL 18 1994
 
THE NATIONAL WEATHER SERVICE IN ST CLOUD MINNESOTA  HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  130 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL MINNESOTA
 
   ...BIG STONE COUNTY
 
AT 1220 PM SHERIFF DEPARTMENT REPORTED GOLFBALL HAIL JUST NORTH OF
GRACEVILLE WHICH IS 20 MILES NORTH OF ORTONVILLE AND SMALLER HAIL
AT CLINTON WHICH IS 12 MILES NORTH OF ORTONVILLE. RADAR ALSO SHOWED
A SEVERE THUNDERSTORM MOVING EAST SOUTHEAST AT 20 MPH THROUGH CENTRAL
BIG STONE COUNTY. THIS STORM WILL MOVE INTO THE VICINITY OF ARTICHOKE...
AND CORRELL BY 100 PM.
 
 
IF YOU OUTSIDE IN THE OPEN...YOU SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.
DO NOT USE ELECTRICAL APPLIANCES OR THE TELEPHONE UNLESS IT IS
AN EMERGENCY.
 
 
 
&
NNNN

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Jul 18, 9:00 AM CDT, 3 hours 31 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST CLOUD MN
900 AM CDT MON JUL 18 1994

PRELIMINARY REPORT FOR 18 JUL 94

815   AM      BIG STONE COUNTY...AT CLINTON 15 N OF ORTONVILLE...
              PEA TO MARBLE HAIL.

900   AM      BIG STONE CTY...14 NE ORTONVILLE...3/4 (DIME) HAIL.

1220  PM      GOLF BALL SIZE HAIL.  TRAVERSE/BIG STONE COUNTY
              LINE...CITY OF GRACEVILLE. 20 MILES NORTH OF
              ORTONVILLE.

1245 PM       GOLF BALL SIZE HAIL...NUMEROUS REPORTS MARBLE SIZE
              HAIL.  VICINITY OF CLINTON IN BIG STONE COUNTY...
              10 MILES NORTH OF ORTONVILLE.

FRASER

Local storm report, Jul 18, 9:03 AM CDT, 3 hours 28 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST CLOUD MN
900 AM CDT MON JUL 18 1994

PRELIMINARY REPORT FOR 18 JUL 94

815 AM      BIG STONE COUNTY...AT CLINTON 15 N OF ORTONVILLE...
            PEA TO M*ARBLE HAIL.

900 AM      BIG STONE CTY...14 NE ORTONVILLE...3/4 (DIME) HAIL.

RAY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 8:18 AM CDT	Severe Thunderstorm Warning	MPX	Big Stone	57 min
Jul 18, 1:36 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle	54 min
Jul 18, 2:06 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	54 min
Jul 18, 2:18 PM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	57 min
Jul 18, 3:10 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	65 min
Jul 18, 5:05 PM CDT	Severe Thunderstorm Warning	MPX	Martin	40 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1994 Every 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.