Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 90, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 11, 1987, 9:55 PM CDT for Yankton County, South Dakota. It was in force for 50 min.
The area
The counties it named.
The facts
- Issued
- Jul 11, 1987, 9:55 PM CDT (02:55 UTC)
- Expired
- Jul 11, 1987, 10:45 PM CDT
- In force
- 50 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Yankton 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
Omaha, NE (KOAX), launched 00:00Z, 2.9 hours before the alert went out and 206 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
- 3602 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 145 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 120248
SVRFSD
SDC027-083-135-120345-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
955
PM CDT SAT JUL 11 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1045 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTHEAST SOUTH DAKOTA
...CLAY...LINCOLN...EAST YANKTON
SOME CITIES INCLUDED IN THIS WARNING
ARE...VERMILLION...YANK9TON...BERESFORD...LENNOX.
AT 945 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS IN
EASTERN LINCOLN AND EAST YANKTON COUNTIES OF SOUTHEAST SOUTH DAKOTA.
{ Basis }
THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.What 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 11, 6:11 PM CDT, 3 hours 44 minutes before
^DSMSPSSUX
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
610 PM CDT SAT JUL 11 1987
...SEVERE THUNDERSTORM WATCH UNTIL 9 PM CDT THIS SATUDAY NIGHT...
AT 605 PM CDT AN ISOLATED STRONG THUNDERSTORM HAD DEVELOPED 10 MILES
EAST OF LAWTON IOWA OR 25 MILES EAST OF SIOUX CITY. THIS STORM WAS
MOVING TO THE NORTHEAST AT 25 MILES AN HOUR.
PEOPLE IN NORTHEAST WOODBURY...CHEROKEE AND NORTHERN IDA COUNTIES IN
IOWA SHOULD BE ALERT AND{ BE PREPARED TO TAKE COVER IF SEVERE WEATHER IS
OBERVED. THIS THUNDERSTORM IS CAPABLE OF PRODUCING LARGE HAIL...STRONG
GUSTY WIND...DANGEROUS LIGHTNING AND VERY HEAVY RAIN.
ROSNERSpecial weather statement, Jul 11, 7:18 PM CDT, 2 hours 37 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 715 PM CDT SAT JUL 11 1987 ...INTENSE THUNDERSORMS CONTINUE TO DEVELOPE ACROSS SOUTHEAST SOUTH DAKOTA... AT 7 PM CDT A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN FALL CONTINUED TO DEVELOPE ACROSS SOUTHEAST SOUTH DAKOTA. THE LINE EXTENDED FROM 80 MILES SOUTHWEST OF SIOUX FALLS...NEAR PICKSTOWN TO 70 MILES NORTHWEST OF SIOUX FALLS...NEAR CARTHAGE. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING VERY HEAVY RAIN... SMALL HAIL...GUSTY SURFACE WINDS AND DANGEROUS LIGHTNING AS THEY MOVE NORTHEAST AT 25 MILES AN HOUR. PERSONS IN THE SOUTH DAKOTA COUNTIES OF MINER...DAVISON...HANSON ...DOUGLAS AND CHARLES MIX INC+LUDING THE COMMUNITIES OF PICKSTOWN ...ARMOUR...MITCHELL AND VILAS SHOULD BE ON THE LOOKOUT FOR THESE STORMS THROUGH 9 PM CDT. PERSONS SHOULD STAY TUNED TO THEIR LOCAL TV AND RADIO STATIONS FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. BUSS
Special weather statement, Jul 11, 8:04 PM CDT, 1 hour 51 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 805 PM CDT SAT JUL 11 1987 ...THUNDERSTORMS WITH HEAVY RAIN CONTINUE ACROSS SOUTHEAST SOUTH DAKOTA... AT 8 PM CDT A LINE OF SCATTERED THUNDERSTORMS WITH HEAVY RAIN CONTINUED ACROSS SOUTHEAST SOUTH DAKOTA. THE LINE EXTENDED FROM 70 MILES SOUTHWEST OF SIOUX FALLS...NEAR PICKSTOWN TO 60 MILES NORTH OF SIOUX FALLS...NEAR BROOKINGS. THESE STORMS WERE PRODUCING HEAVY RAINw AND ARE CAPABLE OF PRODUCING SMALL HAIL...GUSTY SURFACE WINDS AND DANGEROUS LIGHTNING AS THEY MOVE EAST AT 25 MILES AN HOUR. BUSS
Special weather statement, Jul 11, 8:40 PM CDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 835 PM CDT SAT JUL 11 1987 ...TORNADO WATCH FOR PORTIONS OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL MIDNIGHT CDT THIS SATURDAY NIGHT... AT 830 PM CDT...NUMEROUS INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER MOST OF CENTRAL AND EASTERN SOUTH DAKOTA. THE AREA OF PRECIPITATION WAS BOUNDED BY THE MISSOURI RIVER AND THE EASTERN SOUTH DAKOTA BORDER. THE STRONGEST THUNDERSTORMS WERE 20 MILES WEST OF HURON...NEAR WOLSEY...30 MILES NORTHWEST OF SIOUX FALLS...NEAR SALEM AND 25 MILES EAST OF MOBRIDGE...NEAR JAVA. ALL MOVEMENT WAS EAST AT 30 MILES AN HOUR. THESE STORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. IF YOU ARE IN THE PATH OF THESE STORMS YOU SHOULD TAKE COVER. THE HURON AREA CAN EXPECT STRONG GUSTY WINDS...FREQUENT LIGHTNING ...HEAVY RAIN AND HAIL BEFORE 900 PM CDT. EDDY
Special weather statement, Jul 11, 9:20 PM CDT, 35 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 915 PM CDT SAT JUL 11 1987 ...INTENSE THUNDERSORMS WERE INCREASING ACROSS SOUTHEAST SOUTH DAKOTA... AT 9 PM CDT A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED TO INCREASE ACROSS SOUTHEAST SOUTH DAKOTA. THE LINE EXTENDED FROM 70 MILES SOUTHWEST OF SIOUX FALLS...NEAR SPRING/ FIELD TO 60 MILES NORTH OF SIOUX FALLS...NEAR BROOKINGS. THESE STORMS WERE PRODUCING VERY HEAVY RAIN AND ARE CAPABLE OF PRODUCING HAIL... STRONG GUSTY WINDS AND DANGEROUS LIGHTNING AS THEY MOVE TO THE EAST AT 25 MILES AN HOUR. PERSONS IN THE SOUTH DAKOTA COUNTIES OF MOODY...MINNEHAHA...MCCOOK... TURNER AND LINCOLN INCLUDING THE COMMUNITIES OF FLANDREAU...SIOUX FALLS ...DELL RAPIDS AND MARION SHOULD BE ON THE LOOKOUT FOR THESE STORMS THROUGH 10 PM CDT. STAY TUNED TO YOUR LOCAL TV OR RADIO STATION FOR FURTHER STATEMENTS OR POSSIBLE WARNINGS. BUSS
Special weather statement, Jul 11, 9:38 PM CDT, 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 935 PM CDT SAT JUL 11 1987 ...TORNADO WATCH FOR PORTIONS OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL MIDNIGHT CDT THIS SATURDAY NIGHT... AT 930 PM CDT...A LINE OF INTENSE THUNDERSTORMS CONTINUED TO MOVE OVER SOUTHEAST SOUTH DAKOTA AND WESTERN MINNESOTA. THE LINE OF THUNDERSTORMS WAS ALONG AND 10 MILES EITHER SIDE OF A LINE FROM YANKTON TO SIOUX FALLS TO BROOKINGS. THE STRONGEST THUNDERSTORMS WERE JUST WEST OF YANKTON AND 10 MILES NORTH OF YANKTON. THE LINE OF THUNDERSTORMS WAS MOVING EAST AT 30 MILES AN HOUR. THESE STORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT LIGHTNING AND HAIL. IF YOU ARE IN THE PATH OF THESE STORMS YOU SHOULD SEEK SHELTER. OTHERWISE...SCATTERED SHOWERS AND THUNDERSTORMS CONTINUED OVER MOST OF CENTRAL AND EASTERN SOUTH DAKOTA. THESE SHOWERS AND THUNDERSTORMS WERE EAST OF A LINE FROM MOBRIDGE TO PIERRE (TO MITCHELL AND WERE MOVING EAST AT 30 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 |
|---|---|---|---|---|
| Jul 11, 9:14 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson, Turner, Yankton | 61 min |
| Jul 11, 9:55 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln | 50 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.