Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 107, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 23, 1987, 1:54 PM CDT for Bon Homme County, Charles Mix County, South Dakota. It was in force for 66 min.
The area
The counties it named.
The facts
- Issued
- Jul 23, 1987, 1:54 PM CDT (18:54 UTC)
- Expired
- Jul 23, 1987, 3:00 PM CDT
- In force
- 66 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Bon Homme County, SD, Charles Mix 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.9 hours before the alert went out and 293 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
- 260 J/kg
- Mixed-layer CIN
- -517 J/kg
- Mixed-layer LCL
- 1449 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What 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 23, 1:45 PM CDT, 9 minutes before
RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 140 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT FROM 145PM CDT UNTIL 9 PM CDT FOR PORTIONS OF EASTERN SOUTH DAKOTA... AT 125 PM CDT...WIDELY SCATTERED THUNDERSTORMS WERE LOCATED OVER PARTS OF SOUTH EAST CENTRAL AND SOUTHEAST SOUTH DAKOTA. THE THUNDERSTORMS WERE OCCURRING OVER PARTS OF DAVISON... NORTHERN HANSON AND SOUTHERN MINER COUNTIES. MOVEMENT WAS EAST AT 25 MILES AN HOUR. MJILLER
Special weather statement, Jul 23, 1:47 PM CDT, 7 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 140 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT FROM 145PM CDT UNTIL 9 PM CDT FOR PORTIONS OF EASTERN SOUTH DAKOTA... AT 125 PM CDT...WIDELY SCATTERED THUNDERSTORMS WERE LOCATED OVER PARTS OF SOUTH EAST CENTRAL AND SOUTHEAST SOUTH DAKOTA. THE THUNDERSTORMS WERE OCCURRING OVER PARTS OF DAVISON... NORTHERN HANSON AND SOUTHERN MINER COUNTIES. MOVEMENT NWAS EAST AT 25 MILES AN HOUR. MILLER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 12:20 PM CDT | Severe Thunderstorm Warning | FSD | Todd | 55 min |
| Jul 23, 12:31 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 59 min |
| Jul 23, 1:02 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 43 min |
| Jul 23, 1:44 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Yankton | 46 min |
| Jul 23, 6:39 PM CDT | Severe Thunderstorm Warning | FSD | Todd | 66 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.