Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 53, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 20, 1986, 2:41 PM CDT for Lyon County, Osceola County, Sioux County, Iowa. It was in force for 64 min.
The area
The counties it named.
The facts
- Issued
- Jun 20, 1986, 2:41 PM CDT (19:41 UTC)
- Expired
- Jun 20, 1986, 3:45 PM CDT
- In force
- 64 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, Osceola County, IA, Sioux 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
Omaha, NE (KOAX), launched 12:00Z, 7.7 hours before the alert went out and 220 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
- 3626 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -66 m²/s²
- 0-3 km storm-relative helicity
- -49 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 201941 SVRFSD IAC119-143-167-202045- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 241 PM CDT FRI JUN 20 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 345 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHWEST IOWA...EASTERN LYON...WESTERN OSCEOLA AND EASTERN SIOUX SOME OF THE CITIES INCLUDED IN ORANGE CITY..SIBLEY..GEORGE..AND ALTON IN IOWA. AT 240 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 40 MILES SOUTHEAST OF SIOUX FALLS TO 25 MILES SOUTHEAST OF SIOUX FALL SD. BETWEEN THE CITIES OF ALTON AND GEORGE IOWA. *** REPORTED INFORMATION *** AT 210 PM CDT 71 MPH WINDS WERE OBSERVED AT IRETON IOWA. IF YOU ARE IN THE PATH OF THIS STORM..YOU SHOULD GET TO A REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF 60 MPH..HAIL 3/4 INCH OR LARGER..DEADLY LIGHTNING..AND HEAVY RAINp THAT CAN QUICKLY FLOOD A LOW LYING AREA. UMLAND
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
Local storm report, Jun 20, 12:19 PM CDT, 2 hours 22 minutes before
STORM REPORT NATIONAL WEATHER SERVICE HURON SD
Local storm report, Jun 20, 12:29 PM CDT, 2 hours 12 minutes before
STORM REPORT NATIONAL WEATHER SERVICE HURON SD 1220 PM CDT FRI JUN 20 1986 BETWEEN 600 AM CDT AND 730 AM CDT 4 1/2 INCHES OF RAIN WAS REPORTED IN SOUTHERN HAND COUNTY...WASHED OUT A BRIDGE ON AMESTORE ROAD 17 MILES SOUTH AND 1 MILE WEST OF MILLER, SD. ANOTHER REPORT IN SOUTHERN HAND COUNTY OF 5 1/2 INCHES OF RAIN THIS MORNING. PFEIFFER
Special weather statement, Jun 20, 12:41 PM CDT, 2 hours before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 1240 PM CDT FRI JUN 20 1986 AT 1230 PM CDT...INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN HAD DEVELOPED OVER SOUTHEAST SOUTH DAKOTA. THESE STORMS EXTENDED FROM 25 MILES SOUTHWEST OF SIOUX FALLS TO YANKTON. THESE STORMS ARE CAPABLE OF PRODUCING GUSTY WINDS AND HAIL ALONG WITH LOCALLY HEAVY DOWNPOURS. PERSONS IN SOUTHEAST SOUTH DAKOTA SHOULD REMAIN ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS. ELSEWHERE...SCATTERED SHOWERS WERE OCCURRING OVER EASTERN SOUTH DAKOTA AND SOUTHERN NORTH DAKOTA. ALL MOVEMENT WAS NORTH AT 20 MILES AN HOUR. MORRIS
Special weather statement, Jun 20, 12:47 PM CDT, 1 hour 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1245 PM CDT FRI JUN 20 1986 AT 1235 PM CDT RADAR SHOWED A CLUSTER OF INTENSE THUNDERSTORMS DEVELOPING FROM 15 MILES WEST NORTHWEST SIOUX FALLS TO YANKTON. THE THUNDERSTORMS WERE MOVING NORTHNORTHEAST AT 35 MPH. THE THUNDERSTORMS WILL PRODUCE VERY HEAVY RAIN...DANGEROUS CLOUD TO GROUND LIGHTNING AND POSSIBLY HAIL AND STRONG GUSTY WINDS. RESIDENTS NEAR OR NORTHNORTHEAST OF THIS AREA SHOULD BE PREPARED FOR THE ADVERSE WEATHER THESE THUNDERSTORMS MAY BRING AND MOVE TO A SAFE PLACE IF NECESSARY. BLOOM
Special weather statement, Jun 20, 1:31 PM CDT, 1 hour 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 125 PM CDT FRI JUN 20 1986 ....THUNDERSTORMS DEVELOP RAPIDLY ACROSS SIOUXLAND.... NUMEROUS CLUSTERS OF THUNDERSTORMS HAVE DEVELOPED ACROSS THE MUCH OF SIOUXLAND. THE MOST INTENSE THUNDERSTORM WAS LOCATED 45 MILES NORTHWEST OF SIOUX CITY. THE THUNDERSTORMS WERE MOVG TO THE NORTHEAST AT 35 MPH. THESE THUNDERSTORMS WILL PRODUCE HEAVY RAIN POSSIBLY HAIL AND STRONG GUSTY WIND. E PERSONS NEAR THE AREA OF THSES THUNDERSTORMS SHOULD BE PREPARED TO MOVE TO A SAFE PLACE IF THREATENING WEATHER APPROACHES. FREDERICK
Special weather statement, Jun 20, 1:35 PM CDT, 1 hour 6 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 135 PM CDT FRI JUN 20 1986 AT 130 PM CDT...INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED OVER SOUTHEAST SOUTH DAKOTA AND EXTENDED INTO SOUTHWEST MINNESOTA. THE THUNDERSTORMS WERE IN A 100 MILE WIDE AREA FROM YANKTON SOUTH DAKOTA TO 40 MILES NORTHWEST OF REDWOOD FALLS MINNESOTA. THE STRONGEST STORMS EXTENDED FROM 15 MILES SOUTHWEST OF SIOUX FALLS TO BROOKINGS. INTENSITY OF THE STORMS HAD INCREASED SINCE 1230 PM CDT. THESE STORMS ARE CAPABLE OF PRODUCING GUSTY WINDS AND HAIL ALONG WITH LOCALLY HEAVY DOWNPOURS. PERSONS IN SOUTHEAST SOUTH DAKOTA SHOULD REMAIN ALERT FOR RAPIDLY CHANGING WEAT*HER CONDITIONS. ALL MOVEMENT WAS NORTH-NORTHEAST AT 20 MILES AN HOUR. MORRIS
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.