Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 51, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 1987, 7:36 PM CDT for Aurora County, Brule County, Charles Mix County, South Dakota. It was in force for 54 min.
The area
The counties it named.
The facts
- Issued
- Jul 9, 1987, 7:36 PM CDT (00:36 UTC)
- Expired
- Jul 9, 1987, 8:30 PM CDT
- In force
- 54 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Aurora County, SD, Brule 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
Aberdeen, SD (KHON), launched 00:00Z, 0.6 hours before the alert went out and 153 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
- 3310 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1122 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 168 m²/s²
- 0-3 km storm-relative helicity
- 328 m²/s²
- Significant tornado parameter
- 4.0
- Supercell composite
- 21.6
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 9, 2:36 PM CDT, 5 hours 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, 4 hours 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, 7:36 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 54 min |
| Jul 9, 8:07 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Davison, Douglas | 53 min |
| Jul 9, 9:39 PM CDT | Tornado Warning | FSD | Hutchinson, Turner | 36 min |
| Jul 9, 9:47 PM CDT | Severe Thunderstorm Warning | FSD | Turner | 43 min |
| Jul 9, 10:16 PM CDT | Severe Thunderstorm Warning | FSD | Brookings | 59 min |
| Jul 9, 10:23 PM CDT | Severe Thunderstorm Warning | FSD | Turner | 27 min |
| Jul 9, 10:23 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln | 52 min |
| Jul 10, 12:00 AM CDT | Severe Thunderstorm Warning | FSD | Todd, Tripp | 60 min |
| Jul 10, 2:06 AM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 54 min |
| Jul 10, 6:51 AM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 54 min |
| Jul 10, 3:56 PM CDT | Severe Thunderstorm Warning | FSD | Mellette | 64 min |
| Jul 10, 4:05 PM CDT | Tornado Warning | FSD | Mellette | 25 min |
| Jul 10, 4:28 PM CDT | Tornado Warning | FSD | Mellette | 32 min |
| Jul 10, 4:38 PM CDT | Severe Thunderstorm Warning | FSD | Todd | 67 min |
| Jul 10, 4:59 PM CDT | Severe Thunderstorm Warning | FSD | Mellette | 61 min |
| Jul 10, 5:42 PM CDT | Severe Thunderstorm Warning | FSD | Todd, Tripp | 63 min |
| Jul 10, 6:42 PM CDT | Severe Thunderstorm Warning | FSD | Todd, Tripp | 63 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.