Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 187, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 20, 1986, 7:16 AM CDT for Woodbury County, Iowa. It was in force for 44 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 20, 1986, 7:16 AM CDT (12:16 UTC)
- Expired
- Sep 20, 1986, 8:00 AM CDT
- In force
- 44 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Woodbury County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 20, 7:25 AM CDT | Hail 1.75 | Woodbury, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 0.3 hours before the alert went out and 122 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
- 3632 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 179 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 KDSM 201218 SVRSUX IAC193-201300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX CITY IA ISSUED BY DES MOINES IA 716 AM CDT SAT SEP 20 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 800 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF NORTHWEST IOWA...WOODBURY AT 707 AM...GOLF BALL SIZE HAIL WAS REPORTED IN DOWNTOWN SIOUX CITY. THE STORM WAS MOVING EAST AROU-ND 25 MILES AN HOUR. 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. / HAHN
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, Sep 20, 3:54 AM CDT, 3 hours 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 350 AM CDT SAT SEP 20 1986 ...INTENSE THUNDERSTORMS MOVING INTO EXTREME SOUTHEAST SOUTH DAKOTA... AT 345 AM CDT RADAR INDICATED A LINE OF INTENSE THUNDERSTORMS MOVING OUT OF NORTHEAST NEBRASKA INTO EXTREME SOUTHEAST SOUTH DAKOTA. THIS LINE OF THUNDERSTORMS EXTENDED FROM SIOUX CITY IOWA ALONG THE MISSOURI RIVER TO 15 MILES NORTHWEST OF YANKTON SOUTH DAKOTA. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 25 MPH. BRIEF HEAVY RAIN..SMALL HAIL AND STRONG GUSTY WINDS MAY OCCUR WITH THESE THUNDERSTORMS UNTIL 6 AM CDT. COUNTIES EFFECTED WOULD BE YANKTON..TURNER..CLAY..LINCOLN..SOUTHERN MINNEHAHA IN SOUTHEAST SOUTH DAKOTA ALONG WITH SIOUX AND LYON COUNTIES OF NORTHWEST IOWA AND ROCK COUNTY OF SOUTHWEST MINNESOTA. SOME OF CITIES MOST LIKELY EFFECTED WOULD BE YANKTON..VERMILLION..LENNOX..PARKER..SIOUX FALLS IN SOUTH DAKOTA. SIOUX CENTER AND LESTER IN NORTHWEST IOWA AND LUVERNE IN SOUTHWEST MINNESOTA. BEHREND
Special weather statement, Sep 20, 4:54 AM CDT, 2 hours 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 450 AM CDT SAT SEP 20 1986 ...INTENSE THUNDERSTORMS ALONG THE MISSOURI RIVER IN SOUTH CENTRAL SOUTH DAKOTA... AT 445 AM CDT RADAR INDICATED AN INTENSE THUNDERSTORM ALONG THE MISSOURI RIVER IN SOUTHERN CHARLES MIX COUNTY OF SOUTH CENTRAL SOUTH DAKOTA. THIS INTENSITY THUNDERSTORM WAS 35 MILES WEST OF YANKTON OR 20 MILES SOUTHEAST OF PICKSTOWN MOVING TO THE EAST NORTHEAST AT 30 MPH. BRIEF HEAVY RAIN..HAIL AND STRONG GUSTY WINDS MAY OCCUR WITH THE THUNDERSTORM UNTIL 630 AM CDT AS IT MOVES THROUGH BON HOMME..SOUTHERN HUTCHINSON AND CLAY CONTIES. SOME OF THE CITIES MOSTLY LIKELY EFFECTED ARE AVON..OLIVET ..SPRINGFIELD..TYNDALL AND YANKTON. ALSO ANYONE CAMPING ALONG THE MISSOURI RIVER ON LEWIS AND CLARK LAKE SHOULD BE ALERT. BEHREND
Special weather statement, Sep 20, 6:19 AM CDT, 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 615 AM CDT SAT SEP 20 1986 ...INTENSE THUNDERSTORM ALONG THE MISSOURI RIVER IN SOUTHEAST SOUTH DAKOTA... AT 610 AM CDT RADAR INDICATED AN INTENSE THUNDERSTORM ALONG THE MISSOURI RIVER IN SOUTHEAST BON HOMME COUNTY OF SOUTHEAST SOUTH DAKOTA. THIS INTENSITY THUNDERSTORM WAS 15 MILES WEST OF YANKTON IN THE TABOR AREA MOVING TO THE EAST NORTHEAST AT 30 MPH. BRIEF HEAVY RAIN..SMALL HAIL AND STRONG GUSTY WINDS MAY OCCUR WITH THE THUNDERSTORM UNTIL 830 AM CDT AS IT MOVES THROUGH EXTREME EASTERN BON HOMME..YANKTON AND CLAY COUNTIES. SOME OF THE CITIES MOSTLY LIKELY EFFECTED ARE TABOR..YANKTON ..VOLIN AND VERMILLION. ALSO ANYONE CAMPING ALONG THE MISSOURI RIVER ON LEWIS AND CLARK LAKE SHOULD BE ALERT. THE INTENSE THUNDERSTORM WAS PART OF A LARGE AREA OF SHOWERS AND THUNDERSTORMS THAT WERE OVER MUCH OF SOUTHEAST DAKOTA..NORTHWEST AND EXTREME SOUTHWEST MINNESOTA.5 SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE TODAY INTO SUNDAY AS A WARM FRONT OVER IOWA AND NEBRASKA MOVE NORTH THROUGH THE REGION. BEHREND
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.