Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 46, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 1987, 4:32 PM CDT for Mellette County, Todd County, South Dakota. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Jul 9, 1987, 4:32 PM CDT (21:32 UTC)
- Expired
- Jul 9, 1987, 5:30 PM CDT
- In force
- 58 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Mellette County, SD, Todd 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, 9.5 hours before the alert went out and 188 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
- 723 J/kg
- Mixed-layer CIN
- -231 J/kg
- Mixed-layer LCL
- 1251 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 136 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 092132
SVRFSD
SDC095-121-092230-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
432 PM CDT THU JUL 9 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL SOUTH DAKOTA
...MELLETTE...NORTHERN TODD
AT 430 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM ON THE WESTERN
MELLETTE AND WESTERN TODD COUNTY LINE...OR 45 MILES SOUTH SOUTHEAST
OF PHILIP SOUTH DAKOTA. MOVEMENT WAS EAST AT 20 MPH.
SOME CITIES INCLUDED IN THIS WARNING ARE...PARMELEE AND MISSION.
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
OsR NO ADVANCE WARNING SO BE ON THE LOOKOUT.
ANDERSON/THEOPHILUSWhat 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 9, 2:36 PM CDT, 1 hour 56 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 235 PM CDT THU JUL 9 1987 ...A TORNADO WATCH IS IN EFFECT FOR A LARGE PART OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 8 PM CDT THIS THURSDAY EVENING... AT 225 PM CDT...SCATTERED THUNDERSTORMS...SOME INTENSE WITH HAIL AND VERY HEAVY RAIN...CONTINUED DEVELOPING OVER NORTHWESTERN SOUTH DAKOTA. THE STORMS WERE MOSTLY IN ZIEBACH...WESTERN CORSON...AND NORTHWESTERN DEWEY COUNTIES. THEY EXTENDED FROM JUST SOUTHEAST OF LEMMON... TO NEAR DUPREE...WHICH IS 75 MILES NORTHWEST OF PIERRE. HAIL...STRONG WIND...VERY HEAVY RAIN...AND FREQUENT LIGHTNING ARE WITH SOME OF THESE STORMS. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. IF YOU ARE ALONG THE MISSOURI RIVER TO THE NORTH OF PIERRE... YOU SHOULD BE READY TO GET OFF QUICKLY. IF YOU ARE IN THE PATH OF THESE STORMS...YOU SHOULD BE READY TO GET TO A PLACE OF SAFETY. KRAUSE
Special weather statement, Jul 9, 3:36 PM CDT, 56 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 335 PM CDT THU JUL 9 1987 ...A TORNADO WATCH IS IN EFFECT FOR A LARGE PART OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 8 PM CDT THIS THURSDAY EVENING... AT 325 PM CDT...SCATTERED INTENSE THUNDERSTORMS...SOME WITH HAIL AND VERY HEAVY RAIN...WERE DEVELOPING OVER CENTRAL AND SOUTHWESTERN SOUTH DAKOTA. THERE ALSO WERE INTENSE STORMS ENTERING NORTH CENTRAL SOUTH DAKOTA. STRONG STORMS HAD DEVELOPED OVER SOUTHEASTERN HAAKON...EASTERN JACKSON... AND WESTERN BENNETT COUNTIES. THEY EXTENDED FROM 40 MILES SOUTHWEST OF PIERRE...TO 85 MILES SOUTHEAST OF RAPID CITY. HAIL...STRONG WIND... VERY HEAVY RAIN...AND FREQUENT LIGHTNING ARE WITH SOME OF THESE STORMS. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. THESE STORMS ARE MOVING INTO STANLEY AND JONES COUNTIES. IF YOU ARE ALONG THE MISSOURI RIVER IN CENTRAL SOUTH DAKOTA...YOU SHOULD BE READY TO GET OFF QUICKLY. IF YOU ARE IN THE PATH OF THESE STORMS... YOU SHOULD BE READY TO GET TO A PLACE OF SAFETY. ALSO...INTENSE STORMS EXTENDED FROM 45 MILES NORTHWEST OF MOBRIDGE... TO 40 MILES SOUTHWEST OF MOBRIDGE. THESE STORMS ARE ALSO VERY STRONG... AND IF YOU ARE IN THE PATH OF THESE...YOU SHOULD GET TO A PLACE OF SAFETY...AND ALSO GET OFF THE RIVER. KRAUSE
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 5:26 PM CDT | Severe Thunderstorm Warning | FSD | Mellette, Tripp | 64 min |
| Jul 9, 6:30 PM CDT | Severe Thunderstorm Warning | FSD | Brule, Gregory | 60 min |
| Jul 9, 6:30 PM CDT | Severe Thunderstorm Warning | FSD | Tripp | 60 min |
| Jul 9, 6:52 PM CDT | Severe Thunderstorm Warning | FSD | Todd, Tripp | 68 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.