Alert archive / South Dakota / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 99, NWS Sioux Falls, SD

August 18, 1995Clay County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 18, 1995, 8:12 PM CDT for Clay County, South Dakota. It was in force for 33 min.

The area

The counties it named.

The facts

Issued
Aug 18, 1995, 8:12 PM CDT (01:12 UTC)
Expired
Aug 18, 1995, 8:45 PM CDT
In force
33 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Clay County, SD

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 184 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, Omaha, NE at 00:00Z on 1995-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2198 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, Omaha, NE at 00:00Z on 1995-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 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
2198 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
1567 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
281 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 190112 RRA
SVRFSD
SDC027-190145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
812 PM CDT FRI AUG 18 1995

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 845 PM CDT 
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEAST SOUTH DAKOTA

   ...CLAY COUNTY
 
AT 809 PM CDT...A SEVERE THUNDERSTORM WAS DETECTED BY NATIONAL
WEATHER SERVICE DOPPLER RADAR IN SIOUX FALLS 15 MILES EAST OF
YANKTON OR JUST NORTHWEST OF MECKLING MOVING EAST AT 25 MPH.

THIS STORM CAN BE EXPECTED IN THE VICINITY OF...
WESTERVILLE              AROUND 820 PM CDT
HUB CITY                 AROUND 835 PM CDT

LARGE HAIL AND DAMAGING WINDS CAN BE EXPECTED WITH THIS STORM.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

DURING A TORNADO WATCH...BE READY TO MOVE TO A SHELTER BELOW
GROUND OR TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE IF
A WARNING IS ISSUED OR IF A TORNADO IS SIGHTED.


CHAPMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 7:26 PM CDTSevere Thunderstorm WarningFSDYankton29 min
Aug 18, 7:37 PM CDTSevere Thunderstorm WarningFSDClay, Yankton33 min
Aug 18, 8:45 PM CDTSevere Thunderstorm WarningFSDUnion21 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1995Every severe thunderstorm warning in 1995

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.