Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 151, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 1, 1986, 6:46 PM CDT for Lyon County, Osceola County, Iowa. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Aug 1, 1986, 6:46 PM CDT (23:46 UTC)
- Expired
- Aug 1, 1986, 7:45 PM CDT
- In force
- 59 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, Osceola County, IA
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, 11.8 hours before the alert went out and 260 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
- 68 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 2293 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Aug 1, 5:53 PM CDT, 53 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 550 PM CDT FRI AUG 1 1986 ...SEVERE THUNDERSTORM WATCH UNTIL 900 PM CDT FOR PARTS OF EASTERN SOUTH DAKOTA..SOUTHERN MINNESOTA..AND NORTHERN IOWA... AT 550 PM CDT A LINE OF INTENSE THUNDERSTORMS EXTENDED FROM 10 MILES NORTH OF SIOUX FALLS NEAR DELL RAPIDS TO 25 MILES EAST/NORTHEAST OF WORHTINGTON MINNESOTA NEAR FAIRMONT MINNESOTA. THIS LINE OF INTENSE THUNDERSTORMS WAS PRODUCING PEA SIZE HAIL..HEAVY RAINS..DANGEROUS LIGHTNING..AND PERHAPS GUSTY WINDS AS IT MOVES SOUTHEAST AT 20 MPH. THIS LINE OF INTENSE THUNDERSTORMS WILL AFFECT THE AREA FROM SIOUX FALLS EAST THROUGH WORTHINGTON AND JACKSON TO FAIRMONT MINNESOTA BETWEEN 600 PM CDT AND 800 PM CDT. PEA SIZE HAIL AND VERY HEAVY RAINS WERE REPORTED OVER COTTONWOOD COUNTY IN SOUTHWESTERN MINNESOTA AS THE THUNDERSTORMS MOVED THROUGH THAT COUNTY BETWEEN 400 AND 530 PM CDT. < AT 550 PM CDT ANOTHER LINE OF THUNDERSTORMS WITH BRIEF HEAVY RAINS EXTENDED FROM 15 MILES WEST OF SIOUX FALLS BACK TO 25 MILES SOUTHWEST OF MITCHELL SOUTHH DAKOTA. THESE THUNDERSTORMS WERE ALSO MOVING TO THE SOUTHEAST AND WILL AFFECT THE AREA SOUTH OF SIOUX FALLS BETWEEN 600 PM CDT AND 800 PM CDT. NO SEVERE WEATHER HAS BEEN REPORTED SINCE THE SEVERE THUNDERSTORM WATCH WENT INTO EFFECT. EVENTUALLY NORTHWESTERN IOWA WILL EXPERIENCE THE SCATTERED THUNDERSTORMS BETWEEN 700 PM CDT AND 900 PM CDT. KAPELA
Special weather statement, Aug 1, 6:05 PM CDT, 41 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HURON SD 545 PM CDT FRI AUG 1 1986 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR EASTERN SOUTH DAKOTA AND MINNESOTA UNTIL 9:00 PM CDT... AT 530 PM CDT...WIDELY SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED OVER PARTS OF EASTERN SOUTH DAKOTA AND SOUTHWEST MINNESOTA. IN SOUTH DAKOTA AN INTENSE THUNDERSTORM WAS OCCURING 20 MILES SOUTH OF BROOKINGS..ANOUTHER JUST SOUTHWEST OF MITCHELL..AND ANOUTHER 30 MILES SOUTHEAST OF HURON. MOVEMENT WAS EAST AT 25 MILES AN HOUR. EDDY/SPRINGER
Special weather statement, Aug 1, 6:07 PM CDT, 39 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT...CORRECTION NATIONAL WEATHER SERVICE HURON SD 545 PM CDT FRI AUG 1 1986 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR EASTERN SOUTH DAKOTA AND MINNESOTA UNTIL 9:00 PM CDT... AT 530 PM CDT...WIDELY SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED OVER PARTS OF EASTERN SOUTH DAKOTA AND SOUTHWEST MINNESOTA. IN SOUTH DAKOTA AN INTENSE THUNDERSTORM WAS OCCURING 20 MILES SOUTH OF BROOKINGS..ANOUTHER JUST SOUTHWEST OF MITCHELL..AND ANOUTHER 30 MILES SOUTHEAST OF HURON. MOVEMENT WAS EAST AT 25 MILES AN HOUR. EDDY/SPRINGER
Special weather statement, Aug 1, 6:09 PM CDT, 37 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 608 PM CDT FRI AUG 1 1986 ..SEVERE THUNDERSTORM WATCH FOR SIOUX,OBRIEN AND UNION COUNTIES TIL 9 PM... AT 605 PM CDT RADAR INDICATED AN LINE OF STRONG THUNDERSTORMS EXTENDING FROM 25 MILES SOUTHWEST OF MITCHELL SOUTH DAKOTA TO 15 MILE WEST OF SIOUX FALLS SOUTH DAKATO. THESES THUNDERSTORMS LIKELY CONTAIN DANGEROUS LIGHTNING..HEAVY RAIN..GUSTY WINDS AND POSSIBLE SMALL HAIL. PERSONS IN UNION COUNTY SOUTH DAKOTA SHOULD REMAIN ALERT FOR THREATENING WEATHER AS THESE THUNDERSTORMS MOVE SOUTHEAST ACROSS THE AREA AT 25 MILES AN HOUR. THESE STORMS SHOULD ENTER UNION COUNTY AROUND 7 PM. TANNER
Special weather statement, Aug 1, 6:10 PM CDT, 36 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 608 PM CDT FRI AUG 1 1986 ..SEVERE THUNDERSTORM WATCH FOR SIOUX,OBRIEN AND UNION COUNTIES TIL 9 PM... AT 605 PM CDT RADAR INDICATED AN LINE OF STRONG THUNDERSTORMS EXTENDING FROM 25 MILES SOUTHWEST OF MITCHELL SOUTH DAKOTA TO 15 MILE WEST OF SIOUX FALLS SOUTH DAKATO. THESES THUNDERSTORMS LIKELY CONTAIN DANGEROUS LIGHTNING..HEAVY RAIN..GUSTY WINDS AND POSSIBLE SMALL HAIL. PERSONS IN UNION COUNTY SOUTH DAKOTA SHOULD REMAIN ALERT FOR THREATENING WEATHER AS THESE THUNDERSTORMS MOVE SOUTHEAST ACROSS THE AREA AT 25 MILES AN HOUR. THESE STORMS SHOULD ENTER UNION COUNTY AROUND 730 PM. TANNER
Special weather statement, Aug 1, 6:46 PM CDT, 0 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HURON SD 645 PM CDT FRI AUG 1 1986 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR EASTERN SOUTH DAKOTA AND MINNESOTA UNTIL 9:00 PM CDT... AT 630 PM CDT...WIDELY SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED OVER PARTS OF EASTERN SOUTH DAKOTA AND SOUTHWEST MINNESOTA AND NORTHWEST IOWA. IN SOUTH DAKOTA AN AREA OF INTENSE THUNDERSTORMS WAS OCCURING 10 MILES EITHER SIDE OF A LINE FROM 20 MILES SOUTHWEST OF MITCHELL TO 15 MILES SOUTHWEST OF SIOUX FALLS. THESE THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINS..LARGE HAIL..AND GUSTY WINDS. MOVEMENT WAS SOUTHEAST AT 25 MILES AN HOUR. EDDY/SPRINGER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 6:31 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson, Turner | 59 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1986Every severe thunderstorm warning in 1986
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.