Alert archive / South Dakota / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 21, NWS Rapid City, SD

July 11, 1995Perkins County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jul 11, 1995, 9:21 PM MDT for Perkins County, South Dakota. It was in force for 69 min.

The area

The counties it named.

The facts

Issued
Jul 11, 1995, 9:21 PM MDT (03:21 UTC)
Expired
Jul 11, 1995, 10:30 PM MDT
In force
69 min
Issued by
NWS Rapid City, SD
Area
Whole counties

County Perkins County, SD

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 3.4 hours before the alert went out and 161 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, Rapid City, SD at 00:00Z on 1995-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2855 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, Rapid City, SD at 00:00Z on 1995-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 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
2855 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
2398 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
236 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.6

Open this sounding in Storm Lab

The text

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

000 
WUUS1 KRAP 120324 RRA
SVRRAP
SDC105-120430-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RAPID CITY SD
921 PM MDT TUE JUL 11 1995
 
THE NATIONAL WEATHER SERVICE IN RAPID CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN NORTHWEST SOUTH DAKOTA
 
   ...NORTHERN PERKINS COUNTY
 
AT 920 PM MDT...WEATHER SERVICE RADAR SHOWED A SEVERE THUNDERSTORM 50
MILES SOUTHWEST OF LEMMON SD. THE STORM WAS MOVING NORTHEAST AT 40 MPH
AND...IF IT CONTINUES TO MAINTAIN ITS STRENGTH...WILL BE A THREAT TO
LEMMON AT ABOUT 1015PM MDT. ANYONE IN THE PATH OF THIS STORM SHOULD SEEK
A SAFE PLACE AT ONCE. THIS STORM MAY PRODUCE LARGE HAIL ALONG WITH
STRONG GUSTY WINDSS AND DEADLY LIGHTNING.
 
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCED WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

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.