Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 159, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 6, 1986, 8:27 PM CDT for Tripp County, South Dakota. It was in force for 63 min. 5 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 6, 1986, 8:27 PM CDT (01:27 UTC)
- Expired
- Aug 6, 1986, 9:30 PM CDT
- In force
- 63 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Tripp County, SD
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 6, 8:30 PM CDT | Hail 4.5 | Tripp, SD | |
| Aug 6, 8:50 PM CDT | Hail 1 | Tripp, SD | |
| Aug 6, 8:50 PM CDT | Thunderstorm Wind 0 | Tripp, SD | |
| Aug 6, 9:05 PM CDT | Thunderstorm Wind 70 | Tripp, SD | |
| Aug 6, 9:10 PM CDT | Thunderstorm Wind 0 | Tripp, SD |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Aberdeen, SD (KHON), launched 00:00Z, 1.5 hours before the alert went out and 209 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
- 1002 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 1489 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
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 6, 3:52 PM CDT, 4 hours 35 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 345 PM CDT 6 AUG 1986 ...A TORNADO WATCH IS IN EFFECT UNTIL 900 PM CDT FOR PARTS OF CENTRAL AND MUCH OF EASTERN SOUTH DAKOTA... AT 330 PM CDT...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER PARTS OF CENTRAL AND NORTHEAST SOUTH DAKOTA AND INTO SOUTHEAST NORTH DAKOTA. THESE STORMS WERE MOSTLY NORTHWEST OF A LINE FROM MISSION TO BRITTON WITH THE HEAVIEST STORMS LOCATED JUST SOUTH OF BELVIDERE...JUST WEST OF BARNARD AND 10 MILES NORTHWEST OF MIDLAND. MOVEMENT WAS SOUTHEAST AT 25 MILES AN HOUR. EDDY/PFEIFFER
Special weather statement, Aug 6, 4:33 PM CDT, 3 hours 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 430 PM CDT WED AUG 6 1986 ...TORNADO WATCH IN EFFECT FOR PARTS OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 9 PM CDT... AT 425 PM CDT SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN HAVE CONTINUED TO DEVELOP MAINLY IN CENTRAL SOUTH DAKOTA FROM SOUTH OF MOBRIDGE ON SOUTHWEST TO SOUTHEAST OF RAPID CITY. A STRONG THUNDER/ STORM WITH VERY HEAVY RAIN WAS APPROACHING WHITE RIVER LIN SOUTH/CENTRAL SOUTH DAKOTA. ALL THESE THUNDERSTORMS WERE MOVING EAST/SOUTHEAST AT ABOUT 25 MPH AND ARE CAPABLE OF DEVELOPING LARGE HAIL..DAMAGING WINDS.. HEAVY RAINS..AND FREQUENT LIGHTNING. RYRHOLM
Special weather statement, Aug 6, 4:41 PM CDT, 3 hours 46 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 440 PM CDT 6 AUG 1986 ...A TORNADO WATCH IS IN EFFECT UNTIL 900 PM CDT FOR PARTS OF CENTRAL AND MUCH OF EASTERN SOUTH DAKOTA... AT 430 PM CDT...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER PARTS OF CENTRAL SOUTH DAKOTA. THESE STORMS WERE MOSTLY NORTHWEST OF A LINE 15 MILES WEST TO 50 MILES NORTHEAST OF PIERRE. THE STRONGEST STORMS WERE LOC^ATED 15 MILES NORTHWEST OF PIERRE AND 30 MILES SOUTHEAST OF MOBRIDGE. MOVEMENT WAS SOUTHEAST AT 30 MILES AN HOUR. EDDY/MORRIS
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 8:03 PM CDT | Severe Thunderstorm Warning | FSD | Brule, Charles Mix, Gregory | 57 min |
| Aug 6, 9:04 PM CDT | Severe Thunderstorm Warning | FSD | Tripp | 56 min |
| Aug 6, 9:25 PM CDT | Severe Thunderstorm Warning | FSD | Gregory | 65 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 1986Every severe thunderstorm warning in 1986
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.