Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 28, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 4, 1987, 5:46 PM CDT for Hutchinson County, South Dakota. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Jul 4, 1987, 5:46 PM CDT (22:46 UTC)
- Expired
- Jul 4, 1987, 6:45 PM CDT
- In force
- 59 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Hutchinson 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, 10.8 hours before the alert went out and 181 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
- 12 J/kg
- Mixed-layer CIN
- -281 J/kg
- Mixed-layer LCL
- 1158 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 042246
SVRFSD
SDC067-042345-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
546 PM CDT SAT JUL 4 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 645 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTHEAST SOUTH DAKOTA
...EASTERN HUTCHINSON
SOME CITIES INCLUDED IN THIS WARNING...FREEMAN.
AT 545 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES
SOUTHWEST OF FREEMAN MOVING NORTH-NORTHEAST 20 MPH.
LARGE HAIL AND DAMAGING WINDS ARE LIKELY WITH THIS STORM.
IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD GET TO A
REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUC/ES 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, Jul 4, 3:29 PM CDT, 2 hours 17 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 325 PM CDT SAT JUL 4 1987 ...HEAVY THUNDERSTORMS MOVING ACROSS SOUTHEAST SOUTH DAKOTA... AT 320 PM CDT RADAR INDICATED VERY HEAVY THUNDERSTORMS MOVING NORTH THROUGH SOUTHEAST SOUTH DAKOTA. THE HEAVIEST THUNDERSTORMS WERE LOCATED 10 MILES NORTHWEST OF SIOUX FALLS NEAR LYON AND 25 MILES SOUTHWEST OF SIOUX FALLS NEAR MARION. EARLIER...A WIND GUST BETWEEN 40 AND 50 MPH WAS REPORTED NEAR HARTFORD. THESE STORMS WERE MOVING NORTH AT 20 MPH. HEAVY RAIN...GUSTY WINDS...SMALL HAIL AND DANGEROUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THESE THUNDERSTORMS WILL BE MOVING INTO MCCOOK...LAKE AND MOODY COUNTIES O|VER EASTERN SOUTH DAKOTA BY 4 PM CDT. JANSEN
Special weather statement, Jul 4, 3:30 PM CDT, 2 hours 16 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 325 PM CDT SAT JUL 4 1987 ...HEAVY THUNDERSTORMS MOVING ACROSS SOUTHEAST SOUTH DAKOTA... AT 320 PM CDT RADAR INDICATED VERY HEAVY THUNDERSTORMS MOVING NORTH THROUGH SOUTHEAST SOUTH DAKOTA. THE HEAVIEST THUNDERSTORMS WERE LOCATED 10 MILES NORTHWEST OF SIOUX FALLS NEAR LYON AND 25 MILES SOUTHWEST OF SIOUX FALLS NEAR MARION. EARLIER...A WIND GUST BETWEEN 40 AND 50 MPH WAS REPORTED NEAR HARTFORD. THESE STORMS WERE MOVING NORTH AT 20 MPH. HEAVY RAIN...GUSTY WINDS...SMALL HAIL AND DANGEROUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THESE THUNDERSTORMS WILL BE MOVING INTO MCCOOK...LAKE AND MOODY COUNTI~ES OF EASTERN SOUTH DAKOTA BY 4 PM CDT. JANSEN
Special weather statement, Jul 4, 3:44 PM CDT, 2 hours 2 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 335 PM CDT SAT JUL 4 1987 AT 330 PM CDT...SCATTERED INTENSE THUNDERSTORMS AND RAINSHOWERS CONTINUED OVER PARTS OF EASTERN SOUTH DAKOTA. THESE STORMS AND SHOWERS WERE MOSTLY EAST OF THE MISSOURI RIVER WITH THE HEAVIEST THUNDERSTORMS MOSTLY EAST OF A LINE FROM EDEN TO PICKSTOWN. THE HEAVIEST STORMS WERE LOCATED WITHIN A 30 MILE WIDE BAND FROM PEEVER TO HOWARD TO SIOUX FALLS WITH THE MOST INTENSE STORMS LOCATED 15 MILES NORTHWEST OF SIOUX FALLS. THESE STORMS ARE CAPABLE OF PRODUCING HEAVY RAIN...HAIL AND DANGEROUS LIGHTNING. PERSONS IN THE EASTERN QUARTER OF THE STATE...ESPECIALLY THE THE SOUTHEAST PARTS...SHOULD BE ALERT FOR THREATENING WEATHER CONDITIONS. MOVEMENT WAS NORTH AT 20 MILES AN HOUR. PFEIFFER
Special weather statement, Jul 4, 3:59 PM CDT, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 400 PM CDT SAT JUL 4 1987 AT 400 PM CDT RADAR INDICATED UMEROUS SHOWERS AND THUNDERSTORMS OVER EASTERN SOUTH DAKOTA FROM AROUND THE WATERTOWN AREA SOUTH INTO THE SIOUX FALLS...MITCHELL...AND YANKTON AREAS. THE MOST INTENSE STORMS WERE LOCATED NORTH OF SIOUX FALLS BETWEEN MADISON AND GARRETSON. OTHER ISOLATED INTENSE STORMS WERE LOCATED 60 MILES SOUTHWEST OF SIOUX FALLS NEAR PARKSTON AND 15 MILES NORTHEAST OF YANKTON NEAR VOLIN. HEAVY RAIN...GUSTY WINDS TO AROUND 40 MPH...SMALL HAIL AND DANGEROUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH ANY OF THE THUNDERSTORMS. ALL OF THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTH AT 20 MPH. KAPELA
Special weather statement, Jul 4, 4:52 PM CDT, 54 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 450 PM CDT SAT JUL 4 1987 AT 435 PM CDT...SCATTERED INTENSE THUNDERSTORMS AND RAINSHOWERS CONTINUED OVER PARTS OF EASTERN SOUTH DAKOTA. THEY ALSO EXTENDED INTO SOUTHEASTERN NORTH DAKOTA...SOUTHWESTERN MINNESOTA...AND NORTHWESTERN IOWA. THE PRECIPITATION WAS MOSTLY EAST OF THE MISSOURI RIVER. THE STRONGEST THUNDERSTORMS MOSTLY EAST OF A LINE FROM BRITTON... WHICH IS 40 MILES NORTHEAST OF ABERDEEN...TO PARKSTON...WHICH IS WHICH IS SOUTH OF MITCHELL. THESE STORMS WILL PRODUCE VERY HEAVY RAIN...SO IF YOU ARE IN AN AREA THAT MAY QUICKLY FLOOD...BE PREPARED TO LEAVE. SMALL HAIL...GUSTY WINDS...AND DANGEROUS LIGHTNING MAY ALSO BE WITH SOME OF THESE STORMS. MOVEMENT WAS NORTH AT 15 MILES AN HOUR. KRAUSE
Special weather statement, Jul 4, 5:07 PM CDT, 39 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 505 PM CDT SAT JUL 4 1987 AT 455 PM CDT...SHOWERS AND THUNDERSTORMS CONTINUED OVER MUCH OF SOUTHEAST SOUTH DAKOTA AND NOW EXTENDED INTO NORTHWEST IOWA AND INTO EXTREME SOUTHWEST MINNESOTA. IN SOUTH DAKOTA THE ACTIVITY WAS EAST OF A LINE FROM HURON TO JUST WEST OF THE LEWIS AND CLARK LAKE SOUTH OF AVON. THE HEAVIEST THUNDERSTORMS WERE 30 MILES WEST OF SIOUX FALLS NEAR BRIDGEWATER...FROM 10 TO 25 MILES SOUTHEAST OF BROOKINGS NEAR ELKTON... AND 15 MILES NORTHEAST OF SIOUX CITY OVER MERRILL IOWA. THESE STORMS WILL PRODUCE BRIEF HEAVY RAIN...GUSTY WINDS AND POSSIBLY SOME SMALL HAIL. MOVEMENT WAS TO THE NORTH AT 20 MPH. BLAIR
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.