Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 5, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at May 17, 1987, 6:03 PM CDT for Brookings County, Lake County, South Dakota. It was in force for 57 min.
The area
The counties it named.
The facts
- Issued
- May 17, 1987, 6:03 PM CDT (23:03 UTC)
- Expired
- May 17, 1987, 7:00 PM CDT
- In force
- 57 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Brookings County, SD, Lake 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, 11.1 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1265 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- -19 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 172303
SVRFSD
SDC011-079-180000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
603 PM CDT SUN MAY 17 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN EAST CENTRAL SOUTH DAKOTA
...SOUTHERN BROOKINGS...NORTHERN LAKE
SOME CITIES INCLUDED IN THIS WARNING ARE BROOKINGS...RUTLAND AND
SINAI SOUTH DAKOTA.
AT 6 PM CDT RADAR INDICATED A SEVERE THUNDERSTORMS 10 MILES NORTHEAST
AND 10 MILES NORTH OF MADISON SOUTH DAKOTA MOVING NORTHEAST AT 20
MPH.
IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD GET TO A
REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUCES 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.
JANSENWhat 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 17, 3:25 PM CDT, 2 hours 38 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 324 PM CDT SAT MAY 16 1987 ...HEAVY THUNDERSTORMS DEVELOPING ACROSS SOUTHEAST SOUTH DAKOTA... AT 320 PM CDT A NEARLY SOLID LINE OF HEAVY THUNDERSTORMS HAS DEVELOPED RAPIDLY ACROSS SOUTHEAST SOUTH DAKOTA. THE LINE STRETCHED FROM JUST NORTH OF PORTER MINNESOTA SOUTHWEST THROUGH BROOKINGS SOUTH DAKOTA TO JUST EAST OF PICKSTOWN SOUTH DAKOTA. THE HEAVIEST THUNDERSTORMS WERE LOCATED NEAR BROOKINGS...FREEMAN AND SCOTLAND SOUTH DAKOTA. THE THUNDERSTORMS WERE MOVING NORTHEAST AROUND 20 MPH. THESE THUNDERSTORMS WILL CONTINUE TO DEVELOP RAPIDLY DURING THE NEXT FEW HOURS...THUS PERSONS ACROSS SOUTHEAST SOUTH DAKOTA...NORTLHWEST IOWA AND SOUTHWEST MINNESOTA ARE UREGED TO KEEP ABREAST OF THE LATEST WEATHER SITUATION AND BE PREPARED TO TAKE ACTION IF THREATENING WEATHER APPROACHES. JANSEN
Special weather statement, May 17, 3:33 PM CDT, 2 hours 30 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 324 PM CDT SUN MAY 17 1987 ...HEAVY THUNDERSTORMS DEVELOPING ACROSS SOUTHEAST SOUTH DAKOTA... AT 320 PM CDT A NEARLY SOLID LINE OF HEAVY THUNDERSTORMS HAS DEVELOPED RAPIDLY ACROSS SOUTHEAST SOUTH DAKOTA. THE LINE STRETCHED FROM JUST NORTH OF PORTER MINNESOTA SOUTHWEST THROUGH BROOKINGS SOUTH DAKOTA TO JUST EAST OF PICKSTOWN SOUTH DAKOTA. THE HEAVIEST THUNDERSTORMS WERE LOCATED NEAR BROOKINGS...FREEMAN AND SCOTLAND SOUTH DAKOTA. THE THUNDERSTORMS WERE MOVING NORTHEAST AROUND 20 MPH. THESE THUNDERSTORMS WILL CONTINUE TO DEVELOP RAPIDLY DURING THE NEXT FEW HOURS...THUS PERSONS ACROSS SOUTHEAST SOUTH DAKOTA...TNORTHWEST IOWA AND SOUTHWEST MINNESOTA ARE UREGED TO KEEP ABREAST OF THE LATEST WEATHER SITUATION AND BE PREPARED TO TAKE ACTION IF THREATENING WEATHER APPROACHES. JANSEN
Special weather statement, May 17, 3:50 PM CDT, 2 hours 13 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 345 PM CDT SUN MAY 17 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 10 PM CDT FOR PARTS OF SOUTHEASTERN SOUTH DAKOTA... AT 330 PM CDT...A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN HAD DEVELOPED OVER SOUTHEASTERN SOUTH DAKOTA AND EXTREME WESTERN MINNESOTA. THE LINE WAS LOCATED ALONG AND 10 MILES EITHER SIDE OF A LINE FROM 50 MILES EAST OF WATERTOWN...OVER CHIPPEWA COUNTY IN MINNESOTA TO THE MISSOURI RIVER...35 MILES WEST OF YANKTON. THE STRONGEST STORMS WERE OVER BON HOMME COUNTY AND YELLOW MEDICINE COUNTY IN MINNESOTA. THESE STORMS MAY CONTAIN STRONG GUSTY WINDS...FREQUENT LIGHTNINGj AND SMALL HA
Special weather statement, May 17, 3:50 PM CDT, 2 hours 13 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 345 PM CDT SUN MAY 17 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 10 PM CDT FOR PARTS OF SOUTHEASTERN SOUTH DAKOTA... AT 330 PM CDT...A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN HAD DEVELOPED OVER SOUTHEASTERN SOUTH DAKOTA AND EXTREME WESTERN MINNESOTA. THE LINE WAS LOCATED ALONG AND 10 MILES EITHER SIDE OF A LINE FROM 50 MILES EAST OF WATERTOWN...OVER CHIPPEWA COUNTY IN MINNESOTA TO THE MISSOURI RIVER...35 MILES WEST OF YANKTON. THE STRONGEST STORMS WERE OVER BON HOMME COUNTY AND YELLOW MEDICINE COUNTY IN MINNESOTA. THESE STORMS MAY CONTAIN STRONG GUSTY WINDS...FREQUENT LIGHTNlING AND SMALL HAIL. PEOPLE IN THE PATHS OF THESE STORMS SHOULD BE ALERT FOR ANY ADVERSE WEATHER. MOVEMENT WAS NORTHEAST AT 25 MILES AN HOUR. EDDY
Local storm report, May 17, 4:32 PM CDT, 1 hour 31 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
430 PM CDT SUN MAY 17 1987
425 PM CDT...60 TO 70 MPH WINDS REPORTED AT EMERY (10 N BRIDGEWATER SD)
IN MCCOOK COUNTY. WARNING ISSUED AT 415 PM CDT.
JANSENSpecial weather statement, May 17, 5:52 PM CDT, 11 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 550 PM CDT SUN MAY 17 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 10 PM CDT FOR PARTS OF SOUTHEASTERN SOUTH DAKOTA... AT 530 PM CDT...A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER SOUTHEASTERN SOUTH DAKOTA AND EXTREME WESTERN MINNESOTA. THE LINE WAS LOCATED ALONG AND 25 MILES EITHER SIDE OF A LINE FROM 60 MILES EAST OF WATERTOWN...OVER CHIPPEWA COUNTY IN MINNESOTA TO THE MISSOURI RIVER...35 MILES WEST OF YANKTON. THE STRONGEST STORMS WERE OVER SOUTHWEST LAKE COUNTY...SOUTH OF HOWARD AND IN THE BROOKINGS AREA. THE STORMS WERE MOVING NORTHEAST AT 25 MPH. THESE STORMS MA Y CONTAIN STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. PEOPLE IN THE PATH OF THESE STORMS SHOULD BE ALERT FOR THREATENING WEATHER. MOVEMENT WAS NORTHEAST AT 25 MILES AN HOUR. EDDY
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 4:15 PM CDT | Severe Thunderstorm Warning | FSD | McCook, Minnehaha | 60 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.