Alert archive / South Dakota / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 98, NWS Sioux Falls, SD

July 7, 1994Brookings County, Lake County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1994, 12:42 AM CDT for Brookings County, Lake County, South Dakota. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1994, 12:42 AM CDT (05:42 UTC)
Expired
Jul 7, 1994, 1:30 AM CDT
In force
48 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Brookings County, SD, Lake County, SD

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 5.7 hours before the alert went out and 138 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 00:00Z on 1994-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2491 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1994-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
2491 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1107 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 070546
SVRFSD
SDC011-079-070630-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1242 AM CDT THU JUL 7 1994
 
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  130 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL SOUTH DAKOTA
 
   ...WESTERN BROOKINGS COUNTY...NORTHEASTERN LAKE COUNTY
 
AT 1242 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM 20 MILES SOUTHWEST
OF BROOKINGS IN NORTHEAST LAKE COUNTY OVER NUNDA. THE STORM WAS MOVING
TO THE NORTH AT 30 MILES AN HOUR AND SHOULD REACH SINA BY 100 AM CDT.
THE STORM MAY ALSO AFFECT PERSONS IN VOLGA AND BROOKINGS BY 115 AM CDT.
 
 
IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD GET TO A
REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUCES WINDS IN EXCESS
OF 60 MPH...HAIL 3/4 INCH OR LARGER...DEADLY LIGHTNING...AND HEAVY
RAIN THAT CAN QUICKLY FLOOD A LOW LYING AREA.
 
 
MED

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

Special weather statement, Jul 6, 9:32 PM CDT, 3 hours 10 minutes before
SDZ001>005-009-010-012>017-024>033-035>037-041>051-070335-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
930 PM CDT (830 PM MDT) WED JUL 6 1994

...TORNADO WATCH FOR WESTERN SOUTH DAKOTA EXPIRED...
...TORNADO WATCH FOR PORTION OF CENTRAL SOUTH DAKOTA CANCELLED...

THE TORNADO WATCH THAT WAS IN EFFECT FOR WESTERN SOUTH DAKOTA EXPIRED
AT 8 PM MDT.  THERE CONTINUED TO BE SOME SHOWER AND THUNDERSTORMS
OCCURING IN WESTERN SOUTH DAKOTA BUT WERE NO LONGER SEVERE.  THIS
THUNDERSTORMS AND SHOWERS SHOULD CONTINUE TO DECREASE AS THEY MOVE OUT
OF WESTERN SOUTH DAKOTA.

THE SEVERE THUNDERSTORMS THAT HAVE BEEN OVER CENTRAL SOUTH DAKOTA HAVE
MOVED GENERALLY TO THE EAST OF THE MISSOURI RIVER NORTH OF PIERRE. THE
TORNADO WATCH THAT WAS TO BE IN EFFECT UNTIL MIDNIGHT CDT IS NO LONGER
IN EFFECT FOR PARTS OF CENTRAL SOUTH DAKOTA WEST OF THE MISSOURI RIVER
AND NORTH OF PIERRE. SOUTH OF PIERRE THE WATCH IS NO LONGER IN
EFFECT WEST OF A LINE FROM PIERRE TO THE NEBRASKA SOUTH DAKOTA BORDER
NORTH OF VALENTINE. THUNDERSTORMS CONTINUE TO MOVE NORTHEAST OUT OF
NORTH CENTRAL NEBRASKA INTO SOUTH CENTRAL SOUTH DAKOTA AND MAY BECOME
SEVERE AS THE STORMS MOVE INTO SOUTH DAKOTA.  PERSONS IN SOUTH CENTRAL
SOUTH DAKOTA SHOULD REMAIN ALERT FOR THE POSSIBILITY OF SEVERE WEATHER
AS THESE STORMS MOVE THROUGH THEIR AREA.

DO NOT USE YOUR CAR TO OUTRUN A TORNADO.  CARS ARE EASILY TOSSED
AROUND BY TORNADO WINDS.  IF YOU ARE CAUGHT IN THE PATH OF A
TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING.  IF NO
STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT.

MED
Special weather statement, Jul 6, 10:00 PM CDT, 2 hours 42 minutes before
SDZ046-047-049-050-057-058-063-064-070400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
957 PM CDT WED JUL 6 1994

...TORNADO WATCH REMAINS IN EFFECT FOR BRULE...GREGORY...AND TRIPP
COUNTIES IN SOUTH CENTRAL SOUTH DAKOTA UNTIL MIDNIGHT CDT...

...SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR DOUGLAS...
AURORA...AND CHARLES MIX COUNTIES IN SOUTH CENTRAL SOUTH DAKOTA UNTIL 2
AM CDT...

STRONG THUNDERSTORMS WILL CONTINUE TO MOVE OUT OF NORTH CENTRAL
NEBRASKA AND INTO SOUTH CENTRAL SOUTH DAKOTA OVER THE NEXT SEVERAL
HOURS.  AT 1000 PM CDT THE STRONGEST STORMS WERE LOCATED IN
SOUTHERN BRULE COUNTY NEAR BIJOU HILLS AND IN NORTHWEST CHARLES MIX
COUNTY NEAR ACADEMY OR ABOUT 25 MILES TO THE SOUTHEAST OF CHAMBERLAIN.
STRONG STORMS WERE ALSO LOCATED IN SOUTHERN GREGORY COUNTY NEAR THE
NEBRASKA BORDER.  THESE STORMS WERE MOVING TO THE EAST AT 20 MILES AN
HOUR.

THESE STORMS WILL BE MOVING INTO AURORA...DOUGLAS AND DAVISON COUNTIES
BY 1030 PM CDT.  THESE STORMS WILL LIKELY CONTAIN HEAVY RAINS...SMALL
HAIL...AND GUSTY WINDS.

IF YOU ARE OUTDOORS...MOVE TO A PLACE OF SHELTER IMMEDIATELY IF A
STORM APPROACHES.  MOTORISTS SHOULD REMAIN ALERT FOR REDUCED
VISIBILITIES DURING DOWNPOURS OF RAIN.  STREETS MAY FLOOD QUICKLY.

GRAHAM
Special weather statement, Jul 6, 10:06 PM CDT, 2 hours 36 minutes before
SDZ038-052>053-070500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HURON SD
1005 PM CDT WED JUL 6 1994

STRONG THUNDERSTORMS ARE EXPECTED TO MOVE INTO HURON AND WESSINGTON
SPRINGS BY 1030 PM CDT. THESE STORMS HAVE PRODUCED 40 TO 50 MILE AN
HOUR WIND GUSTS DURING THE LAST HOUR. PEOPLE IN BEADLE, SANDBORN AND
JERAULD COUNTIES CAN EXPECT STRONG GUSTY WINDS AND VERY HEAVY RAIN
WITH THESE STORMS.

SEEK SHELTER AS THESE STORMS APPROACH.

...SOLOMON/VOGELSANG
Local storm report, Jul 6, 10:39 PM CDT, 2 hours 3 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE HURON SD
1035 PM CDT WED JUL 6 1994

STORM DATA FOR JUL 6 1994

TIME            COUNTY...LOCATION          CHARACTER OF STORM...DAMAGE

630 PM CDT     STANLEY CO...HAYES 6 W     60 TO 70 MPH WIND
644 PM CDT     STANLEY CO...HAYES 16 NW   60 TO 70 MPH WIND
649 PM CDT     STANLEY CO...HAYES 5 NW    60 TO 70 MPH WIND
730 PM CDT     HUGHES CO...PIERRE         60 TO 70 MPH WIND
808 PM CDT     SULLY CO...ONIDA           80 MPH WIND
819 PM CDT     HUGHES CO...HARROLD 6 S    60 TO 70 MPH WIND
UNKNOWN        HUGHES AND STANLEY CO      WIDESPREAD HEAVY WIND
                                          DAMAGE TO BUILDINGS AND
                                       x   TREES.

SPRINGER
Special weather statement, Jul 6, 10:50 PM CDT, 1 hour 52 minutes before
SDZ003>005-009-010-014>017-032-033-035>037-045>051-070450-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1048 PM CDT (948 PM MDT) WED JUL 6 1994

...TORNADO WATCH FOR CENTRAL SOUTH DAKOTA CANCELLED...

THE TORNADO WATCH THAT WAS STILL IN EFFECT FOR A PORTION OF CENTRAL
SOUTH DAKOTA UNTIL MIDNIGHT CDT HAS BEEN CANCELED.  THE THUNDERSTORMS
HAVE MOVED OUT OF CENTRAL SOUTH DAKOTA AND INTO THE EASTERN THIRD OF
THE STATE.  THE THUNDERSTORMS WERE GENERALLY EAST OF A LINE FROM
ABERDEEN TO PICKSTOWN OR ABOUT 6 MILES SOUTH OF LAKE ANDES.  THE
THUNDERSTORMS CONTINUE TO MOVE TO THE EAST AROUND 35 MILES AN HOUR.

WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRON"G BUILDING.  DO NOT STAND BY WINDOWS.  DO NOT USE TELEPHONES OR
ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS
PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

MED
Special weather statement, Jul 6, 11:58 PM CDT, 44 minutes before
SDZ019-020-022-039-054-070800-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HURON SD
1159 PM CDT WED JUL 6 1994

...SEVERE THUNDERSTORM WATCH CONTINUES FOR EASTERN SOUTH DAKOTA
   UNTIL 200 AM CDT...

...AT 1145 PM CDT...STRONG THUNDERSTORMS CONTINUED TO MOVE THROUGH
EASTERN SOUTH DAKOTA. THE STRONGEST STORMS ARE ALONG A LINE 25 MILES
WIDE FROM 15 MILES SOUTH OF ABERDEEN...THROUGH HURON...TO JUST SOUTH
OF MITCHELL. THESE STORMS ARE MOVING TO THE EAST AT 35 MILES AN HOUR.

PEOPLE IN CLARK, KINGSBURY AND MINER COUNTIES SHOULD BE READY FOR THE
STORMS TO PASS THROUGH AROUND MIDNIGHT. PEOPLE IN CODINGTON AND HAMLIN
COUNTIES SHOULD EXPECT THE STORMS TO ARRIVE AROUND 100 AM CDT.

IN THE PAST HOUR, THESE STORMS HAVE PRODUCED WINDS 40 TO 50 MILES AN
HOUR, PEA SIZE HAIL, AND VERY HEAVY RAIN. PLEASE TAKE SHELTER AS THESE
STORMS APPROACH YOUR AREAS.          ....VOGELSANG...

Nearby

Severe Thunderstorm Warnings in South Dakota, 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.