Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 161, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 6, 1986, 9:25 PM CDT for Gregory County, South Dakota. It was in force for 65 min.
The area
The counties it named.
The facts
- Issued
- Aug 6, 1986, 9:25 PM CDT (02:25 UTC)
- Expired
- Aug 6, 1986, 10:30 PM CDT
- In force
- 65 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Gregory 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, 2.4 hours before the alert went out and 200 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
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFSD 070225 SVRFSD SDC053-070330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 925 PM CDT WED AUG 6 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1030 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTH CENTRAL SOUTH DAKOTA...GREGORY SOME OF THE CITIES INCLUDED IN THIS WARNING ARE GREGORY..BURKE.. DIXON..DALLAS..BONESTELL. AT 925 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES EAST/SOUTHEAST OF WINNER JUST ENTERING GREGORY COUNTY. THIS SEVERE THUNDERSTORM WAS MOVING SOUTHEAST AT 40 MPH. IF YOU ARE IN THE PATH OF THIS STORM..YOU SHOULD GET TO A REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF 60 MPH..HAIL 3/4 INCH OR LARGER..DEADLY LIGHTNING..AND HEAVY RAIN THAT CAN QUICKLY FLOOD A LOW LYING AREA. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ON THE LOOKOUT. KAPELA
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, 5 hours 33 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, 4 hours 52 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, 4 hours 44 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
Local storm report, Aug 6, 9:13 PM CDT, 12 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
915 PM CDT WED AUG 6 1986
TIME EVENT AND LOCATION
905 PM CDT STRONG STRAIGHT LINE WINDS ESTIMATED UP TO
80 MPH TORE OFF ROOF OF A HOUSE IN WINNER OF
TRIPP COUNTY. TREE BRANCHES BROKEN AND POWER
LOST TO PARTS OF CITY.
KAPELAThe 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, 8:27 PM CDT | Severe Thunderstorm Warning | FSD | Tripp | 63 min |
| Aug 6, 9:04 PM CDT | Severe Thunderstorm Warning | FSD | Tripp | 56 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; the sounding from the Mesonet's radiosonde archive.