Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 10, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 26, 1986, 8:01 PM CST for Monona County, Iowa. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Apr 26, 1986, 8:01 PM CST (02:01 UTC)
- Expired
- Apr 26, 1986, 9:00 PM CST
- In force
- 59 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Monona 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 00:00Z, 2.0 hours before the alert went out and 88 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
- 3558 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 291 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 KSUX 270210 COR SVRSUX IAC133-270300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTION NATIONAL WEATHER SERVICE SIOUX CITY IA 801 PM CST SAT APR 26 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM CST FOR PEOPLE IN THE FOLLOWING COUNTY OF WEST CENTRAL IOWA...MONONA AT 753 PM CST GOLFBALL SIZE HAIL WAS REPORTED IN LITTLE SIOUX IOWA OR 45 MILES SOUTH OF SIOUX CITY IOWA BY THE LITTLE SIOUX POLICE. THIS STORM WAS MOVING TO THE NORTHEAST AT 35 MILES AN HOUR AND WILL MOVE INTO SOUTHERN MONONA COUNTY BY 810 PM CST. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN QUICKLY FLOOD LOW LYING AREAS. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED. PLEASE ASK THEn NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE. ROSNER
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, Apr 26, 4:51 PM CST, 3 hours 10 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 440 PM CST SAT APR 26 1986 AT 430 PM CST...NUMEROUS INTENSE THUNDERSTORMS WERE OCCURRING IN SOUTHEAST SOUTH DAKOTA. THE STORMS WERE IN A 45 MILE WIDE AREA FROM 30 MILES SOUTHWEST OF SIOUX FALLS TO 50 MILES NORTHWEST OF YANKTON. LARGE HAIL AND STRONG WIND IS LIKELY IN THE AREA SOUTH OF A LINE SIOUX FALLS TO CHAMBERLAIN..WHICH IS 65 MILES SOUTHEAST OF PIERRE. THESE STORMS WERE MOVING NORTHEAST AT 25 MILES AN HOUR. ALSO...NUMEROUS SHOWERS AND THUNDERSTORMS...SOME WITH VERY HEAVY RAIN...CONTINUED OVER CENTRAL AND NORTHEAST SOUTH DAKOTA. THE HEAVIEST RAIN WAS ALONG AND EAST OF THE JAMES RIVER AND NORTH OF A LINE FROM HURON TO BROOKINGS. THESE SHOWERS AND THUNDERSTORMS WERE MOVING NORTH AT 40 MILES AN HOUR. SPRINGER
Special weather statement, Apr 26, 5:43 PM CST, 2 hours 18 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
540 PM CST SAT APR 26 1986
..TORNADO WATCH TIL 9 PM ......
AT 535 PM CST THERE WAS A LARGE AREA OF THUNDERSTORMS SOME SEVERE
LOCATED 10 MILES SOUTHWEST OF SIOUX CITY TO LINCOLN NEBRASKA TO 20
MILES SOUTHWEST OF NORFOLK NEBRASKA. SOME SEVERE WEATHER HAS BEEN REPORTED
AT NORFOLK NEBRASKA BUT NONE HAS BEEN IN THE SIOUXLAND AREA.
THIS AREA OF THUNDERSTORMS IS MOVING TO THE NORTHEAST AT 30 MPH.
TANNERSpecial weather statement, Apr 26, 5:46 PM CST, 2 hours 15 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 540 PM CST SAT APR 26 1986 AT 530 PM CST...NUMEROUS INTENSE THUNDERSTORMS CONTINUED OVER SOUTHEAST SOUTH DAKOTA. THE STORMS WERE ALONG AND EAST OF THE JAMES RIVER AND SOUTH OF A LINE FROM MITCHELL TO BROOKINGS. LARGE HAIL AND STRONG WIND IS LIKELY IN THE AREA ALONG AND SOUTH OF A LINE FROM MITCHELL TO SIOUX FALLS. THESE STORMS WERE MOVING EAST AT 25 MILES AN HOUR. ALSO...NUMEROUS SHOWERS AND THUNDERSTORMS...SOME WITH VERY HEAVY RAIN...CONTINUED OVER CENTRAL AND NORTHEAST SOUTH DAKOTA...MAINLY ALONG AND EAST OF THE MISSOURI RIVER AND NORTH OF A LINE FROM BROOKINGS TO CHAMBERLAIN..WHICH IS= 60 MILES SOUTHEAST OF PIERRE. VERY HEAVY RAIN IS LIKELY IN THE AREA ALONG AND 45 MILE EITHER SIDE OF A LINE FROM PIERRE TO MOBRIDGE. THESE SHOWERS AND THUNDERSTORMS WERE MOVING NORTH AT 40 MILES AN HOUR. SPRINGER
Local storm report, Apr 26, 6:17 PM CST, 1 hour 44 minutes before
STORM REPORT NATIONAL WEATHER SERVICE SIOUX FALLS SD 615 PM CST SAT APR 26 1986 4:20 PM CST TYNDALL SD..UP TO BASEBALL SIZE HAIL. 5:20 PM CST VIBORG SD..TREE DOWN (BASE OF TREE 12 INCHES) 5:23 PM CSdT 2 MI WEST HURLEY SD TORNADO MOVING EAST NORTHEAST 30 MPH. 5:35 PM CST DAVIS SD..FUNNEL CLOUD. 5:35 PM CST CENTERVILLE SD..FUNNEL CLOUD. BIER
Special weather statement, Apr 26, 6:48 PM CST, 1 hour 13 minutes before
SPECIA KHON 270048 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 645 PM CST SAT APR 26 1986 AT 630 PM CST...NUMEROUS INTENSE THUNDERSTORMS CONTINUED OVER PARTS OF CENTRAL AND SOUTHEAST SOUTH DAKOTA. THE STORMS WERE LOCATED EAST OF A WATERTOWN/YANKTON LINE..AND ALSO NORTH OF A PIERRE/HURON LINE. LARGE HAIL AND STRONG WINDS ARE LIKELY IN AND AROUND THESE STORMS. THESE STORMS WERE MOVING EAST AT 25 MILES AN HOUR. SPRINGER/MILLER
Special weather statement, Apr 26, 7:40 PM CST, 21 minutes before
SPECIA KHON 270140 SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 740 PM CST SAT APR 26 1986 AT 730 PM CST...NUMEROUS INTENSE THUNDERSTORMS CONTINUED OVER PARTS OF CENTRAL SOUTH DAKOTA. THE STORMS WERE LOCATED NORTH OF A PIERRE/MITCHELL LINE. MOSTLY LIGHT SHOWERS WHERE LOCATED ALONG THE SOUTHEAST PART OF SOUTH DAKOTA. HAIL AND STRONG WINDS ARE LIKELY IN AND AROUND THESE STORMS. THE INTENSE THUNDERSTORMS THAT HAD BEEN LOCATED OVER PARTS OF EASTERN SOUTH DAKOTA HAVE MOVED EASTWARD INTO SOUTHWEST MINNESOTA AND NORTHWEST IOWA. THESE STORMS WERE MOVING NORTHEAST AT 40 MILES AN HOUR. SPRINGER/MILLER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 6:23 PM CST | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 67 min |
| Apr 26, 6:38 PM CST | Tornado Warning | FSD | Lyon, Osceola | 37 min |
| Apr 26, 6:46 PM CST | Tornado Warning | FSD | Lyon, Osceola | 29 min |
| Apr 26, 6:55 PM CST | Tornado Warning | FSD | Lyon, Osceola | 35 min |
| Apr 26, 7:58 PM CST | Severe Thunderstorm Warning | FSD | Osceola | 62 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.