Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 110, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 23, 1987, 7:19 PM CDT for Aurora County, Davison County, South Dakota. It was in force for 56 min.
The area
The counties it named.
The facts
- Issued
- Jul 23, 1987, 7:19 PM CDT (00:19 UTC)
- Expired
- Jul 23, 1987, 8:15 PM CDT
- In force
- 56 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Aurora County, SD, Davison 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 00:00Z, 0.3 hours before the alert went out and 134 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
- 3000 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 1575 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 10.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 240019
SVRFSD
SDC003-035-240115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
719 PM CDT THU JUL 23 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL SOUTH DAKOTA
...NORTHERN AURORA
IN SOUTHEAST SOUTH DAKOTA
...NORTHERN DAVISON
SOME CITIES INCLUDED IN THIS WARNING...MITCHELL...PLANKINTON.
AT 715 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM IN NORTHERN
AURORA COUNTY JUST NORTH OF PLANKINTON SOUTH DAKOTA MOVING EAST AT 30
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.
THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.
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 23, 1:45 PM CDT, 5 hours 34 minutes before
RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 140 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT FROM 145PM CDT UNTIL 9 PM CDT FOR PORTIONS OF EASTERN SOUTH DAKOTA... AT 125 PM CDT...WIDELY SCATTERED THUNDERSTORMS WERE LOCATED OVER PARTS OF SOUTH EAST CENTRAL AND SOUTHEAST SOUTH DAKOTA. THE THUNDERSTORMS WERE OCCURRING OVER PARTS OF DAVISON... NORTHERN HANSON AND SOUTHERN MINER COUNTIES. MOVEMENT WAS EAST AT 25 MILES AN HOUR. MJILLER
Special weather statement, Jul 23, 1:47 PM CDT, 5 hours 32 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 140 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT FROM 145PM CDT UNTIL 9 PM CDT FOR PORTIONS OF EASTERN SOUTH DAKOTA... AT 125 PM CDT...WIDELY SCATTERED THUNDERSTORMS WERE LOCATED OVER PARTS OF SOUTH EAST CENTRAL AND SOUTHEAST SOUTH DAKOTA. THE THUNDERSTORMS WERE OCCURRING OVER PARTS OF DAVISON... NORTHERN HANSON AND SOUTHERN MINER COUNTIES. MOVEMENT NWAS EAST AT 25 MILES AN HOUR. MILLER
Special weather statement, Jul 23, 2:34 PM CDT, 4 hours 45 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 235 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 9 PM CDT FOR PORTIONS OF EASTERN SOUTH DAKOTA... AT 225 PM CDT...WIDELY SCATTERED SHOWERS WERE OCCURRING OVER PARTS OF EXTREME EASTERN SOUTH DAKOTA...WHILE NORTHEAST NEBRASKA HAD WIDELY SCATTERED THUNDERSTORMS WITH HEAVY RAIN. IN SOUTH DAKOTA THE SHOWERS WERE LOCATED FROM NEAR HOWARD...25 MILES NORTHWEST OF MITCHELL NORTHEAST TO ABOUT 10 MILES EAST OF CLEAR LAKE ...OR ABOUT 25 MILES NORTHEAST OF BROOKINGS. THE THUNDERSTORMS THAT WERE IN NEBRASKA WERE ABOUT 10 MILES SOUTH OF BONESTEEL MOVEMENT WAS EAST AT 15 MILES AN HOUR. MILLER
Special weather statement, Jul 23, 3:36 PM CDT, 3 hours 43 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 335 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 9 PM CDT FOR PORTIONS OF EASTERN SOUTH DAKOTA... AT 325 PM CDT...WIDELY SCATTERED THUNDERSTORMS AND SHOWERS WERE OCCURRING OVER PARTS OF EXTREME SOUTH CENTRAL SOUTH DAKOTA. IN SOUTH DAKOTA THE SHOWERS WERE LOCATED OVER SOUTHERN CHARLES MIX AND GREGORY COUNTIES OR SOUTH OF A BONESTEEL/ARMOUR LINE. MOVEMENT WAS EAST AT 15 MILES AN HOUR. MILLER
Special weather statement, Jul 23, 5:20 PM CDT, 1 hour 59 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 515 PM CDT THU JUL 23 1987 ...TORNADO WATCH UNTIL 9 PM CDT FOR A LARGE PORTION OF SOUTH DAKOTA AND SOUTHWEST MINNESOTA... AT 510 PM CDT RADAR INDICATED ONLY LIGHT RAIN SHOWERS ACROSS DOUGLAS COUNTY OF SOUTHEAST SOUTH DAKOTA. THESE SHOWERS CONTINUE TO WEAKEN AS THEY MOVED EAST. < HOWEVER...THUNDERSTORMS ARE EXPECTED TO REDEVELOP OVER THE WATCH AREA TONIGHT AS AN UPPER LEVEL DISTURBANCE MOVES ACROSS SOUTH DAKOTA. AT 510 PM THUNDERSTORMS HAD BEGUN TO DEVELOP OVER WESTERN SOUTH DAKOTA WITH THIS DISTURBANCE. PERSONS ACROSS EASTERN SOUTH DAKOTA...SOUTHWEST MINNESOTA AND NORTHWEST IOWA SHOULD KEEP ABREAST OF THIS WEATHjER SITUATION BY LISTENING TO NOAA WEATHER RADIO...LOCAL RADIO OR TELEVISION FOR LATER STATEMENTS OR POSSIBLE WARNINGS. JANSEN
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 7:08 PM CDT | Severe Thunderstorm Warning | FSD | Mellette, Todd | 67 min |
| Jul 24, 2:26 PM CDT | Severe Thunderstorm Warning | FSD | Yankton | 64 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.