Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 112, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 23, 1987, 9:02 PM CDT for Lincoln County, Lyon County, Minnesota. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Jul 23, 1987, 9:02 PM CDT (02:02 UTC)
- Expired
- Jul 23, 1987, 10:00 PM CDT
- In force
- 58 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lincoln County, MN, Lyon County, MN
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, 2.0 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
- 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 240202
SVRFSD
MNC081-083-240300-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
902 PM CDT THU JUL 23 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1000 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTHWEST MINNESOTA
...LINCOLN...LYON
SOME CITIES INCLUDED IN THIS WARNING...MARSHALL...TYLER...IVANHOE AND
TRACY.
AT 900 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST SOUTH OF
IVANHOE MINNESOTA MOVING EAST AT 20 MPH. THIS STORM WILL PRODUCE
HEAVY RAINS AND LARGE HAIL.
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, 3:36 PM CDT, 5 hours 26 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, 3 hours 42 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
Special weather statement, Jul 23, 7:42 PM CDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 740 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 9 PM CDT FOR PORTIONS OF EASTERN SOUTH DAKOTA... AT 730 PM CDT...AN ISOLATED INTENSE THUNDERSTORM WITH VERY HEAVY RAIN WAS LOCATED OVER SOUTHEAST CENTRAL SOUTH DAKOTA. THE THUNDERSTORM WAS OVER CENTRAL AURORA COUNTY...NEAR PLANKINTON OR ABOUT 30 MILES WEST OF MITCHELL. HAIL AND STRONG WINDS ARE POSSI)BLE WITH THIS STORM. MOVEMENT COULD NOT BE DETERMINED AT THIS TIME. MILLER
Special weather statement, Jul 23, 7:44 PM CDT, 1 hour 18 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 740 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 9 PM CDT FOR A LARGE PART OF WESTERN..CENTRTAL AND EASTERN SOUTH DAKOTA... AT 730 PM CDT...AN ISOLATED INTENSE THUNDERSTORM WITH VERY HEAVY RAIN WAS LOCATED OVER SOUTHEAST CENTRAL SOUTH DAKOTA. THE THUNDERSTORM WAS OVER CENTRAL AURORA COUNTY...NEAR PLANKINTON OR ABOUT 30 MILES WEST OF MITCHELL. H+AIL AND STRONG WINDS ARE POSSIBLE WITH THIS STORM. MOVEMENT COULD NOT BE DETERMINED AT THIS TIME. MILLER
Special weather statement, Jul 23, 8:02 PM CDT, 1 hour before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 800 PM CDT THU JUL 23 1987 ...TORNADO WATCH UNTIL 9 PM CDT FOR A LARGE PORTION OF SOUTH DAKOTA AND SOUTHWEST MINNESOTA... AT 800 PM CDT...THUNDERSTORMS...SOME OF THEM INTENSE WITH HEAVY RAIN WERE SCATTERED OVER SOUTHEAST SOUTH DAKOTA AND SOUTHWEST MINNESOTA. THUNDERSTORMS EXTENDED IN A NARROW BAND FROM ABOUT 50 MILES NORTH OF SIOUX FALLS...JUST NORTH OF BROOKINGS SOUTH DAKOTA...NORTHEAST TO ABOUT 100 MILES NORTHEAST OF SIOUX FALLS...NEAR REDWOOD FALLS MIN/ NESOTA. THUNDERSTORMS WERE ALSO OCCURRING OVER A SMALL AREA ABOUT 70 MILES WEST OF SIOUX FALLS...NEAR MITCHELL SOUTH DAKOTA. SOME OF THE HEAVIEST RAIN WAS FALLING ABOUT 55 MILES NORTH OF SIOUX FALLS...JUST NORTH OF BROOKINGS SOUTH DAKOTA. THESE THUNDERSTORMS WERE MOVING EAST AT ABOUT 30 MILES AN HOUR. THESE THUNDERSTORMS MAY PRODUCE SOME HEAVY RAIN...SMALL HAIL AND DANGEROUS LIGHTNING. PLEASE LISTEN FORI LATER STATEMENTS AND POSSIBLE WARNINGS. GOLDEN
Special weather statement, Jul 23, 8:45 PM CDT, 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 840 PM CDT THU JUL 23 1987 ...A TORNADO WATCH IS IN EFFECT UNTIL 9 PM CDT FOR MOST OF SOUTH DAKOTA... AT 830 PM CDT...AN ISOLATED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED OVER EXTREME EASTERN SOUTH DAKOTA AND ALSO OVER SOUTHEAST CENTRAL SOUTH DAKOTA. THE THUNDERSTORMS WERE OVER SOUTHEAST DUEL AND NORTHEAST BROOKINGS COUNTIES OR ABOUT 15 MILES NORTHEAST OF BROOKINGS AND ALSO OVER CENTRAL DAVISON COUNTY NEAR MITCHELL. HAIL AND STRONG WINDS ARE POSSIBLE WITH THESE STORMS. MOVEMENT WAS EAST 25 MILES AN HOUR. MILLER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 7:46 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon | 59 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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.