Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 171, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 16, 1986, 9:16 PM CDT for Davison County, South Dakota. It was in force for 59 min. 1 report 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 16, 1986, 9:16 PM CDT (02:16 UTC)
- Expired
- Aug 16, 1986, 10:15 PM CDT
- In force
- 59 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Davison 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 16, 9:45 PM CDT | Thunderstorm Wind 52 | Davison, 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, 2.3 hours before the alert went out and 138 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
- 3044 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 1221 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 197 m²/s²
- 0-3 km storm-relative helicity
- 507 m²/s²
- Significant tornado parameter
- 5.1
- Supercell composite
- 42.9
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 16, 5:43 PM CDT, 3 hours 33 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 540 PM CDT SAT AUG 16 1986 ...THUNDERSTORM DEVELOPING RAPIDLY IN SOUTHWEST MINNESOTA... AT 540 PM CDT A STRONG THUNDERSTORM HAS BEEN DEVELOPING RAPIDLY JUST NORTH OF TYLER IN SOUTHWEST MINNESOTA..OR ABOUT 50 MILES NORTHEAST OF SIOUX FALLS..SOUTH DAKOTA. THIS THUNDERSTORM WILL BE QUITE CAPABLE OF PRODUCING VERY HEAVY RAIN..SOME HAIL..GUSTY WINDS..AND SHARP LIGHTNING AS IT MOVES EAST AT ABOUT 20 MPH. OTHER STRONG THUNDERSTORMS ARE LIKELY TO DEVELOP FROM EAST TO WEST ALONG AND NEAR A SLOW MOVING FRONT EXTENDING FROM SOUTHWEST MINNESOTA THROUGH SOUTHEAST SOUTH DAKOTA THIS EVENING. SOME OF THESE THUNDERSTORMS COULD BE SEVERE. RYRHOLM
Special weather statement, Aug 16, 6:51 PM CDT, 2 hours 25 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 645 PM CDT SAT AUG 16 1986 ...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST SOUTH DAKOTA UNTIL 1100 PM CDT... AT 630 PM CDT...AN AREA OF INTENSE THUNDERSTORMS HAD FORMED OVER CENTRAL AND EAST CENTRAL SOUTH DAKOTA..WEST OF A LINE FROM SIOUX FALLS TO ABERDEEN AND EAST OF THE MISSOURI RIVER. PERSONS IN THE WATCH AREA SHOULD BE ON THE ALERT FOR DEVELOPING SEVERE WEATHER..AS THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING LARGE HAIL.. DAMAGING THUNDERSTORM WINDS..AND DANGEROUS LIGHTNING. MOVEMENT OF THESE THUNDERSTORMS WAS EAST AT 15 MILES AN HOUR. STOREY
Special weather statement, Aug 16, 7:49 PM CDT, 1 hour 27 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 745 PM CDT SAT AUG 16 1986 ...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST SOUTH DAKOTA UNTIL 1100 PM CDT... AT 730 PM CDT...AN AREA OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER PARTS OF CENTRAL AND EAST CENTRAL SOUTH DAKOTA. MOST OF THE THUNDERSTORMS WERE LOCATED EAST AND SOUTHEAST OF A LINE FROM NEAR PIERRE TO COLUMBIA..15 MILES NORTH OF ABERDEEN. PERSONS IN THE WATCH AREA SHOULD BE ON THE ALERT FOR DEVELOPING SEVERE WEATHER..AS THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING LARGE HAIL.. DAMAGING THUNDERSTORM WINDS..AND DANGEROUS LIGHTNING. MOVEMENT OF THESE THUNDERSTORMS WAS EAST AT 15 MILES AN_ HOUR. MILLER/STOREY
Special weather statement, Aug 16, 8:39 PM CDT, 37 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 840 PM CDT SAT AUG 16 1986 ...SEVERE THUNDERSTORM WATCH UNTIL 11 PM CDT FOR EAST CENTRAL AND SOUTHEASTERN SOUTH DAKOTA... AT 830 PM CDT RADAR INDICATED AREA OF INTENSE THUNDERSTORMS OVER EAST CENTRAL SOUTH DAKOTA. THE AREA EXTENDED FROM ABOUT 30 MILES WEST OF MITCHELL SOUTH DAKOTA TO NEAR BROOKINGS. MOVEMENT WAS EAST AT 10 MPH. SOME OF THESE THUNDERSTORMS WILL LIKELY CONTAIN HEAVY RAIN AND SMALL HAIL AND STRONG GUSTY WINDS. NO SEVERE THUNDERSTORM WARNINGS ARE IN EFFECT FOR SOUTHEASTERN SOUTH DAKOTA. HOWEVER..PEOPLE IN SOUTHEASTERN SOUTH DAKOTA SHOULD BE ALERT FOR THE POSSIBILITY OF SEVERE WEATHER DEVELOPING. ANDERSON
Local storm report, Aug 16, 9:03 PM CDT, 13 minutes before
STORM REPORT NATIONAL WEATHER SERVICE SIOUX FALLS SD 900PAM CDT SAT AUG 16 1986 TIME EVENT AND LOCATION 850 PM CDT 51 MPH WIND GUST AT CHAMBERLAIN SD IN BRULE COUNTY. KAPELA
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 9:10 PM CDT | Tornado Warning | FSD | Aurora, Brule | 35 min |
| Aug 16, 9:16 PM CDT | Severe Thunderstorm Warning | FSD | Hanson, McCook | 59 min |
| Aug 16, 9:16 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Brule | 59 min |
| Aug 16, 10:05 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Minnehaha | 55 min |
| Aug 16, 10:05 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Turner | 55 min |
| Aug 16, 10:17 PM CDT | Severe Thunderstorm Warning | FSD | Davison, Douglas, Hutchinson | 58 min |
| Aug 16, 10:17 PM CDT | Severe Thunderstorm Warning | FSD | Hanson | 58 min |
| Aug 16, 10:37 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln, Turner | 68 min |
| Aug 16, 10:37 PM CDT | Severe Thunderstorm Warning | FSD | Yankton | 68 min |
| Aug 16, 11:06 PM CDT | Severe Thunderstorm Warning | FSD | Union | 54 min |
| Aug 17, 12:10 AM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 65 min |
| Aug 17, 12:30 AM CDT | Severe Thunderstorm Warning | FSD | Monona | 60 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.