Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 32, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 6, 1987, 6:35 PM CDT for Todd County, Tripp County, South Dakota. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Jul 6, 1987, 6:35 PM CDT (23:35 UTC)
- Expired
- Jul 6, 1987, 7:30 PM CDT
- In force
- 55 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Todd County, SD, Tripp 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
Rapid City, SD (KRAP), launched 12:00Z, 11.6 hours before the alert went out and 226 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.
- Mixed-layer CAPE
- 91 J/kg
- Mixed-layer CIN
- -567 J/kg
- Mixed-layer LCL
- 2193 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 062335
SVRFSD
SDC121-123-070030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
635 PM CDT MON JUL 6 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL SOUTH DAKOTA
...EASTERN TODD...TRIPP
SOME CITIES INCLUDED IN THIS WARNING...WINNER AND COLOME.
AT 635 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 15
MILES NORTH OF WINNER TO 55 MILES SOUTHWEST OF WINNER SOUTH DAKOTA.
THE LINE WAS MOVING EAST NORTHEAST AT 20 MPH.
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.
JANSENWhat 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, 4:27 PM CDT, 2 hours 8 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HURON SD 425 PM CDT MON JUL 6 1987 AT 420 PM CDT...SCATTERED THUNDERSTORMS WERE DEVELOPING RAPIDLY OVER CENTRAL SOUTH DAKOTA. THE STORMS WERE MOSTLY IN EASTERN HUGHES AND EASTERN SULLY COUNTIES...FROM 25 MILES SOUTHEAST OF PIERRE... TO 25 MILES NORTHEAST OF PIERRE. THESE STORMS WILL PRODUCE HAIL...GUSTY WIND...FREQUENT LIGHTNING... AND VERY HEAVY RAINS. THE STORMS MAY ALSO DEVELOP ALONG THE MISSOURI RIVER. IF YOU ARE IN SULLY...HUGHES...OR HYDE COUNTIES... OR IF YOU ARE IN RECREATION AREAS ALONG THE MISSOURI...YOU SHOULD BE PREPARED TO GET TO A PLACE OF SAFETY. IF YOU ARE BOATING ON THE MISSOURI RIVER...YOU SHOULD BE PREPARED TO GET OFF. KRAUSE
Special weather statement, Jul 6, 6:08 PM CDT, 27 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 607 PM CDT MON JUL 6 1987 ...SEVERE THUNDERSTORM WATCH FOR EASTERN SOUTH DAKOTA UNTIL 11 PM CDT... AT 6 PM CDT NATIONAL WEATER SERVICE RADARS INDICATED AN INTENSE THUNDERSTORM IN SOUTHEASTERN TODD COUNTY. THIS THUNDERSTORM WAS MOVING EAST NORTHEAST AT 20 MPH AND WILL BE MOVING INTO WESTERN TRIPP COUNTY BY 7 PM CDT. STRONG WINDS...SMALL HAIL...HEAVY RAINS AND DANGEROUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THIS STORM. PERSONS ACROSS EASTERN TODD AND WESTERN TRIPP COUNTIES INCLUDING THE COMMUNITIES OF KEYA PAHA AND CLEARFIELD SHOULD KEEP ABREAST OF THIS WEATHER SITUATION AND BE PREPARED TO GO TO A SAFE PLAGCE IN THREATENING WEATHER APPROACHES OR IF A WARNING IS ISSUED. JANSEN
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 6:32 PM CDT | Severe Thunderstorm Warning | FSD | Brule, Charles Mix, Gregory, Tripp | 118 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 1987Every severe thunderstorm warning in 1987
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.