Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 67, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 10, 1987, 11:01 PM CDT for Todd County, Tripp County, South Dakota. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Jul 10, 1987, 11:01 PM CDT (04:01 UTC)
- Expired
- Jul 11, 1987, 12:00 AM CDT
- In force
- 59 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 00:00Z, 4.0 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
- 144 J/kg
- Mixed-layer CIN
- -129 J/kg
- Mixed-layer LCL
- 1661 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 110401
SVRFSD
SDC121-123-110500-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1101 PM CDT FRI JUL 10 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL MIDNIGHT CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL SOUTH DAKOTA
...SOUTHEASTERN TODD...SOUTHERN TRIPP
SOME OF THE CITIES INCLUDED ARE KEYAPAHA AND CLEARFILE.
AT 1055 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES
NORTHWEST OF VALETINE NEBRASKA OR 5 MILES SOUTH OF ST FRANCIS SOUTH
DAKOTA. THE THUNDERSTORM WAS MOVING TO THE EAST AT 35 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.
THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.
BEHRENDWhat 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 10, 8:20 PM CDT, 2 hours 41 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 820 PM CDT FRI JUL 10 1987 ...TORNADO WATCH NUMBER 356 IS HAS BEEN CANCELLED FOR SECTIONS OF CENTRAL SOUTH DAKOTA... TORNADO WATCH NUMBER 356 HAS BEEN CANCELLED FOR A PART OF CENTRAL SOUTH DAKOTA. THE TORNADO WATCH IS NO LONGER IN EFFECT FOR EASTERN CORSON...EASTERN DEWEY...CAMPBELL...WALWORTH...POTTER...SULLY... STANLEY AND JONES COUNTIES. TORNADO WATCH NUMBER 356 DOES HOWEVER REMAIN IN EFFECT FOR MUCH OF THE REMAINDER OF CENTRAL AND NORTHEAST SOUTH DAKOTA. BEHREND
Special weather statement, Jul 10, 8:36 PM CDT, 2 hours 25 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 835 PM CDT FRI JUL 10 1987 ...TORNADO WATCH UNTIL 1100 PM CDT FOR PORTIONS OF CENTRAL AND NORTHEAST SOUTH DAKOTA... AT 830 PM CDT...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL CONTINUED OVER SOUTH CENTRAL AND NORTHEASTERN SOUTH DAKOTA ...AND EXTENDED INTO SOUTHEASTERN NORTH DAKOTA AND NORTH CENTRAL NEBRASKA. IN SOUTH DAKOTA...THE AREA OF THUNDERSTORMS WAS LOCATED ALONG AND 30 MILES EITHER SIDE OF A LINE FROM WINNER TO ABERDEEN. THE STRONGEST THUNDERSTORMS WERE 30 MILES SOUTHEAST OF WINNER...15 MILES WEST OF BONESTEEL AND 20 MILES NORTHWEST OF ABERDEEN...NEAR BARNARD. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. ALL MOVEMENT WAS EAST AT 30 MILES AN HOUR. EDDY
Local storm report, Jul 10, 8:49 PM CDT, 2 hours 12 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
850 PM CDT FRI JUL 10 1987
410 PM CDT TORNADO NEAR CEDAR BUTTE SOUTH DAKOTA IN MELLETTE COUNTY.
REPORTED BY MELLETTE COUNTY SHEFIFF.
420 PM CDT TORNADO EAST OF LONG VALLEY SOUTH DAKOTA IN MELLETTE
COUNTY AND SECONG TORNADO BY WHITE RIVER SOUTH DAKOTA IN
MELLETTE COUNTY.
426 PM CDT TENNIS BALL SIZE HAIL AT CEDAR BUTTE IN MELLETTE COUNTY.
604 PM CDT MARBLE SIZE HAIL AND 3/4 OF AN INCH OF RAIN IN 10 MINUTES
AT MISSION SOUTH DAKOTA IN TODD COUNTY.
BEHRENDSpecial weather statement, Jul 10, 8:58 PM CDT, 2 hours 3 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 855 PM CDT FRI JUL 10 1987 ...INTENSE THUNDERSTORM OVER SOUTHERN GREGORY COUNTY OF SOUTH CENTRAL SOUTH DAKOTA... AT 850 PM CDT RADAR INDICATED AN INTENSE THUNDERSTORM IN SOUTHERN GREGORY COUNTY OF SOUTH CENTRAL SOUTH DAKOTA. THE THUNDERSTORM WAS LOCATED 70 MILES SOUTH OF PIERRE OR 10 MILES EAST OF BONESTEEL SOUTH DAKOTA. THE THUNDERSTORM WAS MOVING EAST AT 30 MPH. PEOPLE IN SOUTHERN GREGORY AND SOUTHERN CHARLES MIX COUNTIES OF SOUTH DAKOTA SHOULD BE ALERT...ESPECIALLY IN THE CITIES OF BONESTEEL... PICKSTOWN AND WAGNER. VERY HEAVY RAIN...STRONG WINDS AND HAIL ARE POSSIBLE UNTIL 930 PM CDT. BEHREND
Special weather statement, Jul 10, 9:36 PM CDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 835 PM CDT FRI JUL 10 1987 ...TORNADO WATCH UNTIL 1100 PM CDT FOR PORTIONS OF CENTRAL AND NORTHEAST SOUTH DAKOTA... AT 830 PM CDT...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL CONTINUED OVER NORTHEASTERN SOUTH DAKOTA AND SOUTHEASTERN NORTH DAKOTA. IN SOUTH DAKOTA...THE THUNDERSTORMS WERE LOCATED ALONG AND 30 MILES EITHER SIDE OF A LINE FROM 50 MILES EAST OF PIERRE TO 40 MILES NORTHEAST OF ABERDEEN. THE STRONGEST THUNDERSTORMS WERE 50 MILES NORTHWEST OF HURON...NEAR ORIENT AND 20 MILES SOUTH OF ABERDEEN...NEAR NORTHVILLE. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. OTHERWISE...SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED TO DISSIPATE OVER SOUTH CENTRAL AND EAST CENTRAL SOUTH DAKOTA AND INTO NORTH CENTRAL NEBRASKA. THE AREA OF SHOWERS AND THUNDERSTORMS WAS LOCATED ALOKNG AND 20 MILES EITHER SIDE OF A LINE FROM HURON TO 30 MILES EAST OF WINNER. ALL MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. EDDY
Special weather statement, Jul 10, 10:43 PM CDT, 18 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 1035 PM CDT FRI JUL 10 1987 ...TORNADO WATCH UNTIL 1100 PM CDT FOR PORTIONS OF CENTRAL AND NORTHEAST SOUTH DAKOTA... AT 1030 PM CDT...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL CONTINUED OVER NORTHEASTERN SOUTH DAKOTA AND SOUTHEASTERN NORTH DAKOTA. IN NORTHEASTERN SOUTH DAKOTA...THE THUNDERSTORMS WERE LOCATED ALONG AND 30 MILES EITHER SIDE OF A LINE FROM REDFIELD...30 MILES SOUTH OF ABERDEEN TO SISSETON...45 MILES NORTH OF WATERTOWN. THE STRONGEST THUNDERSTORMS WERE JUST SOUTHWEST OF REDFIELD...30 MILES SOUTH OF ABERDEEN AND NEAR LAKE CITY...45 MILES NORTH OF WATERTOWN. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. OTHERWISE...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN HAD BEGUN TO DEVELOP OVER SOUTH CENTRAL SOUTH DAKOTA AND NORTH CENTRAL NEBRASKA. THE DEVELOPING THUNDERSTORMS WERE LOCATED ALONG AND 20 MILES EITHER SIDE OF A LINE FROM 70 MILES SOUTHEAST OF RAPID CITY...IN BENNETT COUNTY TO 40 MILES WEST OF PIERRE...IN WESTERN STANLEY COUNTY. ALL MOVEMENT WAS EAST AT 30 MILES AN HOUR. EDDY
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 2:00 AM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory | 60 min |
| Jul 11, 2:00 AM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 60 min |
| Jul 11, 2:23 AM CDT | Severe Thunderstorm Warning | FSD | Davison, Douglas, Hanson, Hutchinson | 67 min |
| Jul 11, 2:37 AM CDT | Severe Thunderstorm Warning | FSD | Brookings, Lake | 68 min |
| Jul 11, 2:55 AM CDT | Severe Thunderstorm Warning | FSD | Turner, Yankton | 65 min |
| Jul 11, 2:55 AM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 65 min |
| Jul 11, 3:16 AM CDT | Severe Thunderstorm Warning | FSD | Lake, McCook | 59 min |
| Jul 11, 3:46 AM CDT | Severe Thunderstorm Warning | FSD | Minnehaha, Moody | 59 min |
| Jul 11, 3:46 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 59 min |
| Jul 11, 4:35 PM CDT | Severe Thunderstorm Warning | FSD | Mellette | 55 min |
| Jul 11, 5:00 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 30 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.