Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 6, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 29, 1987, 3:06 PM CDT for Charles Mix County, Gregory County, South Dakota. It was in force for 54 min.
The area
The counties it named.
The facts
- Issued
- May 29, 1987, 3:06 PM CDT (20:06 UTC)
- Expired
- May 29, 1987, 4:00 PM CDT
- In force
- 54 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Charles Mix County, SD, 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 12:00Z, 8.1 hours before the alert went out and 193 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
- 611 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 957 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- -22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 292004
SVRFSD
SDC023-053-292100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
306 PM CDT FRI MAY 29 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 400 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL SOUTH DAKOTA
...NORTHERN CHARLES-MIX...NORTHEASTERN GREGORY
SOME CITIES INCLUDED IN THIS WARNING ARE ACADEMY AND PLATTE SOUTH
DAKOTA.
AT 300 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES NORTHEAST
OF GREGORY SOUTH DAKOTA MOVING EASTNORTHEAST AT 20 MPH.
THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.
THEOPHILUSWhat 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, May 29, 1:41 PM CDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 135 PM CDT FRI MAY 29 1987 AT 130 PM CDT...THUNDERSTORMS HAD BEGUN DEVELOPING OVER SOUTHEAST AND EXTREME EAST CENTRAL SOUTH DAKOTA. SCATTERED THUNDERSTORMS WERE FORMING IN THE AREA ALONG AND EAST OF THE MISSOURI RIVER AND SOUTH OF A LINE FROM BROOKINGS TO FORT THOMPSON...WHICH IS 45 MILES SOUTHEAST OF PIERRE. VERY HEAVY RAIN AND SMALL HAIL ARE LIKELY IN SOME OF THESE STORMS...AND STRONG WIND IS POSSIBLE. SHOWERS AND THUNDERSTORMS WILL CONTINUE DEVELOPING OVER EASTERN AND SOUTHEAST SOUTH DAKOTA. MOVEMENT WAS EAST AT 10 MILES AN HOUR. SPRINGER
Special weather statement, May 29, 2:43 PM CDT, 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 245 PM CDT FRI MAY 29 1987 ...STRONG THUNDERSTORMS CONTINUE TO DEVELOP ACROSS PORTIONS OF SOUTH CENTRAL AND SOUTHEAST SOUTH DAKOTA... AT 235 PM CDT STRONG THUNDERSTOMS WITH VERY HEAVY RAINFALL WERE DEVELOPING RAPIDLY ACROSS SOUTH CENTRAL AND SOUTHEAST PORTIONS OF SOUTH DAKOTA. THE THUNDERSTORMS WERE IN AN AREA 70 MILES WIDE EXTENDING FROM 75 MILES NORTHEAST OF SIOUX FALLS...NEAR MARSHALL MINNESOTA TO 115 MILES WEST OF SIOUX FALLS...NEAR CHAMBERLAIN SOUTH DAKOTA. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR AND ARE CAPABLE OF PRODUCING VERY HEAVY RAINFALL...GUSTY WINDS...HAIL AND DANGEROUS LIGHTxNING. STAY TUNED TO THIS STATION FOR ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS. BUSS
Special weather statement, May 29, 2:44 PM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 240 PM CDT FRI MAY 29 1987 AT 230 PM CDT...THUNDERSTORMS...SOME INTENSE WITH VERY HEAVY RAIN AND HAIL...CONTINUED TO RAPIDLY DEVELOP OVER SOUTH CENTRAL AND SOUTHEASTERN SOUTH DAKOTA. ONE OF THE STRONGEST STORMS WAS IN BRULE COUNTY...FROM 35 TO 50 MILES SOUTHWEST OF HURON. HAIL...FREQUENT LIGHTNING...AND STRONG WIND ARE ALL POSSIBLE WITH THIS STORM. OTHER STRONG STORMS WERE FROM 25 MILES SOUTHEAST OF MITCHELL...TO NEAR LAKE FRANCES CASE...AND ON TO NEAR VALENTINE NEBRASKA. HAIL AND STRONG WIND ARE ALSO POSSIBLE WITH THESE. OTHER STRONG THUNDERSTORMS WERE SCATTERED EAST OF A LINE FROM ABERDEyEN TO YANKTON. MOVEMENT WAS NORTHEAST AT 15 MILES AN HOUR. KRAUSE
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 2:50 PM CDT | Tornado Warning | FSD | Tripp | 25 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.