Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 49, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 1987, 6:30 PM CDT for Tripp County, South Dakota. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- Jul 9, 1987, 6:30 PM CDT (23:30 UTC)
- Expired
- Jul 9, 1987, 7:30 PM CDT
- In force
- 60 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Tripp 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, 11.5 hours before the alert went out and 209 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
- 854 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 101 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 092330
SVRFSD
SDC015-053-123-100030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
630 PM CDT THU JUL 9 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL SOUTH DAKOTA
...WESTERN BRULE...NORTHERN GREGORY...NORTHEASTERN TRIPP
AT 625 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES
NORTH/NORTHEAST OF WINNER MOVING EAST AT 30 MPH.
SOME CITIES INCLUDED CHAMBERLAIN...HAMILL...AND DIXON.
THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.
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.
THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNAD O WITH LITTLE
OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.
RYRHOLM/ANDERSONWhat 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 9, 2:36 PM CDT, 3 hours 54 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 235 PM CDT THU JUL 9 1987 ...A TORNADO WATCH IS IN EFFECT FOR A LARGE PART OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 8 PM CDT THIS THURSDAY EVENING... AT 225 PM CDT...SCATTERED THUNDERSTORMS...SOME INTENSE WITH HAIL AND VERY HEAVY RAIN...CONTINUED DEVELOPING OVER NORTHWESTERN SOUTH DAKOTA. THE STORMS WERE MOSTLY IN ZIEBACH...WESTERN CORSON...AND NORTHWESTERN DEWEY COUNTIES. THEY EXTENDED FROM JUST SOUTHEAST OF LEMMON... TO NEAR DUPREE...WHICH IS 75 MILES NORTHWEST OF PIERRE. HAIL...STRONG WIND...VERY HEAVY RAIN...AND FREQUENT LIGHTNING ARE WITH SOME OF THESE STORMS. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. IF YOU ARE ALONG THE MISSOURI RIVER TO THE NORTH OF PIERRE... YOU SHOULD BE READY TO GET OFF QUICKLY. IF YOU ARE IN THE PATH OF THESE STORMS...YOU SHOULD BE READY TO GET TO A PLACE OF SAFETY. KRAUSE
Special weather statement, Jul 9, 3:36 PM CDT, 2 hours 54 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 335 PM CDT THU JUL 9 1987 ...A TORNADO WATCH IS IN EFFECT FOR A LARGE PART OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 8 PM CDT THIS THURSDAY EVENING... AT 325 PM CDT...SCATTERED INTENSE THUNDERSTORMS...SOME WITH HAIL AND VERY HEAVY RAIN...WERE DEVELOPING OVER CENTRAL AND SOUTHWESTERN SOUTH DAKOTA. THERE ALSO WERE INTENSE STORMS ENTERING NORTH CENTRAL SOUTH DAKOTA. STRONG STORMS HAD DEVELOPED OVER SOUTHEASTERN HAAKON...EASTERN JACKSON... AND WESTERN BENNETT COUNTIES. THEY EXTENDED FROM 40 MILES SOUTHWEST OF PIERRE...TO 85 MILES SOUTHEAST OF RAPID CITY. HAIL...STRONG WIND... VERY HEAVY RAIN...AND FREQUENT LIGHTNING ARE WITH SOME OF THESE STORMS. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. THESE STORMS ARE MOVING INTO STANLEY AND JONES COUNTIES. IF YOU ARE ALONG THE MISSOURI RIVER IN CENTRAL SOUTH DAKOTA...YOU SHOULD BE READY TO GET OFF QUICKLY. IF YOU ARE IN THE PATH OF THESE STORMS... YOU SHOULD BE READY TO GET TO A PLACE OF SAFETY. ALSO...INTENSE STORMS EXTENDED FROM 45 MILES NORTHWEST OF MOBRIDGE... TO 40 MILES SOUTHWEST OF MOBRIDGE. THESE STORMS ARE ALSO VERY STRONG... AND IF YOU ARE IN THE PATH OF THESE...YOU SHOULD GET TO A PLACE OF SAFETY...AND ALSO GET OFF THE RIVER. KRAUSE
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 4:32 PM CDT | Severe Thunderstorm Warning | FSD | Mellette, Todd | 58 min |
| Jul 9, 5:26 PM CDT | Severe Thunderstorm Warning | FSD | Mellette, Tripp | 64 min |
| Jul 9, 6:30 PM CDT | Severe Thunderstorm Warning | FSD | Brule, Gregory | 60 min |
| Jul 9, 6:52 PM CDT | Severe Thunderstorm Warning | FSD | Todd, Tripp | 68 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.