Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 125, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 15, 1987, 5:02 PM CDT for Aurora County, South Dakota. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Aug 15, 1987, 5:02 PM CDT (22:02 UTC)
- Expired
- Aug 15, 1987, 6:00 PM CDT
- In force
- 58 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Aurora 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 12:00Z, 10.0 hours before the alert went out and 132 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
- 1389 J/kg
- Mixed-layer CIN
- -261 J/kg
- Mixed-layer LCL
- 1459 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 100 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, Aug 15, 3:55 PM CDT, 1 hour 7 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HURON SD 345 PM CDT SAT AUG 15 1987 ...TORNADO WATCH FOR EASTERN SOUTH DAKOTA UNTIL 900 PM CDT SATURDAY... AT 330 PM CDT...SCATTERED INTENSE THUNDERSTORMS...SOME SEVERE CONTINUED OVER EASTERN SOUTH DAKOTA. THE THUNDERSTORMS WERE 20 MILES EITHER SIDE OF A LINE FROM 30 MILES WEST OF HURON...NEAR MILLER TO 70 MILES NORTHWEST OF ABERDEEN AT THE NORTH AND SOUTH DAKOTA BORDER. THE STRONGEST STORM WAS 10 MILES SOUTH OF ABERDEEN. THESE STORMS HAVE PRODUCE TORNADOES...LARGE HAIL...STRONG GUSTY WIND AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 30 MILES AN HOUR. HUTCHEON
Special weather statement, Aug 15, 4:53 PM CDT, 9 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 450 PM CDT SAT AUG 15 1987 ...TORNADO WATCH FOR EASTERN SOUTH DAKOTA UNTIL 900 PM CDT SATURDAY... AT 430 PM CDT...NUMEROUS SEVERE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER NORTHEASTERN SOUTH DAKOTA. THE SEVERE THUNDERSTORMS WERE LOCATED 20 MILES EITHER SIDE OF A LINE FROM REDFIELD...ABOUT 30 MILES NORTH OF HURON TO BRITTON...35 MILES NORTHEAST OF ABERDEEN. THESE STORMS HAVE PRODUCED TORNADOES...LARGE HAIL...VERY HEAVY RAIN AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 30 MILES AN HOUR AND CONTINUED TO DEVELOP TO THE SOUTH. ...OTHERWISE INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN WERE DEVELOPING IN SOUTH CENTRAL SOUTH DAKOTA. THE THUNDERSTORMS WERE LOCATED JUST WEST OF LAKE ANDES. THESE STORMS MAY PRODUCE VERY HEAVY RAIN...HAIL... STRONG GUSTY WIND...DANGEROUS LIGHTNING AND RAPID FLOODING OF LOW LYING AREAS. THESE THUNDERSTORMS ARE MOVING TO THE NORTHEAST AT 25 MILES AN HOUR. HUTCHEON
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 3:52 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory | 68 min |
| Aug 15, 4:55 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 65 min |
| Aug 15, 5:57 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 63 min |
| Aug 15, 6:57 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 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.