Alert archive / South Dakota / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 130, NWS Sioux Falls, SD

August 14, 1990Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 14, 1990, 4:55 PM CDT for Gregory County, South Dakota. It was in force for 53 min.

The area

The counties it named.

The facts

Issued
Aug 14, 1990, 4:55 PM CDT (21:55 UTC)
Expired
Aug 14, 1990, 5:48 PM CDT
In force
53 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Gregory County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Aberdeen, SD (KHON), launched 12:00Z, 9.9 hours before the alert went out and 200 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 1990-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 702 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 1990-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 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
702 J/kg
Mixed-layer CIN
-210 J/kg
Mixed-layer LCL
1660 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
147 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 KFSD 142156
SVRFSD
SDC053-142300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
455 PM CDT TUE AUG 14 1990
 
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  600 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH CENTRAL SOUTH DAKOTA
          ...EASTERN GREGORY
 
SOME CITIES INCLUDED IN THIS WARNING ARE BURKE...LUCUS...
AND BONESTEEL.
 
AT 455 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM WAS LOCATED
35 MILES EAST OF WINNER NEAR THE MISSOURI RIVER WHERE STATE
HIGHWAY 44 CROSSES THE RIVER. THIS SEVERE THUNDERSTORM WAS
MOVING AND BUILDING SOUTH/SOUTHEAST AT 10 MPH.
 
THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.
 
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.
KAPELA

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, Aug 14, 3:25 PM CDT, 1 hour 30 minutes before
SDZ017-142100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
325 PM CDT TUE AUG 14 1990

...A THUNDERSTORM WITH VERY HEAVY RAIN WAS OVER WESTERN HANSON COUNTY
OF SOUTHEAST SOUTH DAKOTA...

AT 320 PM RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN AND
POSSIBLE SMALL HAIL 55 MILES WEST NORTHWEST OF SIOUX FALLS OR JUST
EAST OF MITCHELL SOUTH DAKOTA IN EXTREME WESTERN HANSON COUNTY.

THIS STORM WAS MOVING EAST SOUTHEAST AT 15O MPH AND WILL CONTINUE TO
AFFECT HANSON COUNTY OF SOUTHEAST SOUTH DAKOTA THROUGH 4 PM.

PERSONS IN HANSON COUNTY SHOULD KEEP ALERT TO THE CHANGING WEATHER
CONDITIONS AND BE PREPARED TO SEEK SHELTER IF THREATENING WEATHER
APPROACHES.

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 14, 4:25 PM CDTSevere Thunderstorm WarningFSDCharles Mix35 min
Aug 14, 4:30 PM CDTSevere Thunderstorm WarningFSDDavison, Hanson30 min
Aug 14, 4:47 PM CDTSevere Thunderstorm WarningFSDMinnehaha43 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1990Every severe thunderstorm warning in 1990

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.