Alert archive / South Dakota / Tornado Warnings in 1987
Tornado Warning 10, NWS Aberdeen, SD
NWS Aberdeen, SD issued this tornado warning at Jul 9, 1987, 7:20 PM CDT for Brown County, South Dakota. It was in force for 25 min.
The area
The counties it named.
The facts
- Issued
- Jul 9, 1987, 7:20 PM CDT (00:20 UTC)
- Expired
- Jul 9, 1987, 7:45 PM CDT
- In force
- 25 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Brown 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, 0.3 hours before the alert went out and 77 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 tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Local storm report, Jul 9, 4:53 PM CDT, 2 hours 27 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
450 PM CDT THU JUL 9 1987
TIME: EVENT AND AREA:
230 PM MDT VERY HEAVY RAIN AND MARBLE SIZE HAIL AT GLEN CROSS
IN DEWEY COUNTY.
430 PM CDT FUNNEL CLOUD OVER MOBRIDGE SOUTH DAKOTA IN WALWORTH
COUNTY AS REPORTED BY CIVIL DEFENSE.
415 PM CDT GOLFBALL HAIL ALONG WITH 50 KNOT WIND AT THE WATER
PLANT (WEATHER OBSERVER) AT MOBRIDGE.
435 PM CDT TORNADO 5 MILES SOUTH OF MOBRIDGE REPORTED BY STATE
POLICE.
STUDNICKALocal storm report, Jul 9, 6:05 PM CDT, 1 hour 15 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
600 PM CDT THU JUL 9 1987
TIME: EVENT AND PLACE:
515 PM CDT 16 MILES SOUTHWEST OF GETTYSBURY IN POTTER COUNTY.
.98 INCH OF RAIN IN 20 MINUTES WITH PEA SIZE HAIL
COVERING THE GROUND.
537 PM CDT HOVEN S.D. IN POTTER COUNTY. VERY HEAVY RAIN.
540 PM CDT 16 MILES SOUTH OF LONG LAKE IN MCPHERSON COUNTY THE
PUBLIC REPORTED A FUNNEL CLOUD TO THE ABERDEEN P.D.
STUDNICKASpecial weather statement, Jul 9, 7:15 PM CDT, 5 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 710 PM CDT THU JUL 9 1987 ...TORNADO WATCH IN EFFECT UNTIL 8 PM CDT FOR MUCH OF CENTRAL AND EASTERN SOUTH DAKOTA... INTENSE THUNDERSTORM ACTIVITY OVER NORTH CENTRAL AND NORTHEASTERN SOUTH DAKOTA THIS EVENING WILL PRODUCE PERIODS OF VERY HEAVY RAIN AND SOME SMALL HAIL AND GUSTY SURFACE WIND. SOME AREAS COULD GET SMALL STREAM FLOODING AND ALSO WITH IN URBAN AREAS SOME STREET FLOObDING. STUDNICKA
The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 8:13 PM CDT | Tornado Warning | ABR | Day | 32 min |
| Jul 10, 4:26 PM CDT | Severe Thunderstorm Warning | ABR | Jones | 64 min |
| Jul 10, 4:50 PM CDT | Severe Thunderstorm Warning | ABR | Stanley | 55 min |
| Jul 10, 5:06 PM CDT | Tornado Warning | ABR | Stanley | 39 min |
| Jul 10, 5:53 PM CDT | Tornado Warning | ABR | Sully | 37 min |
| Jul 10, 6:05 PM CDT | Severe Thunderstorm Warning | ABR | Stanley | 55 min |
| Jul 10, 6:13 PM CDT | Severe Thunderstorm Warning | ABR | Potter, Walworth | 62 min |
| Jul 10, 6:55 PM CDT | Severe Thunderstorm Warning | ABR | Edmunds | 65 min |
Nearby
Tornado Warnings in South Dakota, 1987Every tornado warning in 1987Tornadoes 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.