Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 28, NWS Sioux Falls, SD

May 10, 1986Clay County, Yankton County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 10, 1986, 5:50 PM CDT for Clay County, Yankton County, South Dakota. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
May 10, 1986, 5:50 PM CDT (22:50 UTC)
Expired
May 10, 1986, 6:45 PM CDT
In force
55 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Clay County, SD, 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 12:00Z, 10.8 hours before the alert went out and 195 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.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 1986-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 1986-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.1939Sfc1 km3 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3576 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFSD 102250
SVRFSD
SDC079-087-099-027-125-135-102345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
550 PM CDT SAT MAY 10 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 645 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTHEAST SOUTH DAKOTA...LAKE...MCCOOK...WESTERN MINNEHAHA...CLAY...
 TURNER AND EASTERN YANKTON

THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.

SOME OF THE CITIES INCLUDED IN SOUTHEAST SOUTH DAKOTA ARE
MADISON..SALEM..COLTON..MARION..PARKER..VOLIN..VERMILLION.

AT 545 PM CDT  RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
 FROM 10 MILES WEST OF MADISON TO 30 MILES WEST OF SIOUX
FALLS TO 5 MILES EAST OF YANKTON MOVING EAST AT 25 MPH.

 AT 540 PM CDT PARKER STATE RADIO REPORTED 1 INCH HAIL
AT EMERLY ABOUT 20 EAST SOUTHEAST OF MITCHELL.

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 RAIN
THAT CAN QUICKLY FLOOD A LOW LYING AREA.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR
NO ADVANCE WARNING SO BE ON THE LOOKOUT.

KOSCIELSKI

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, May 10, 5:12 PM CDT, 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
510 PM CDT SAT MAY 10 1986

AT 505 PM CDT A SOLID LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN
WAS WAS LOCATED FROM 5 MILES WEST OF ARLINGTON OR 22 MILES WEST OF
BROOKINGS TO BRIDGEWATER OR 30 MILES WEST OF SIOUX FALLS TO 5 MILES
EAST OF YANKTON IN SOUTHEAST SOUTH DAKOTA. THE STORMS ARE MOVING EAST
AT ABOUT 30 MPH AND WILL EFFECT THE FOLLOWING COUNTIES BETWEEN 510 PM
AND 610 PM CDT...BROOKINGS LAKE..MOODY..MCCOOK..MINNEHAHA..TURNER..
LINCOLN..EAST YANKTON.. AND CLAY. SOME CITIES EFFECT ARE BROOKINGS..
MADISON..SALEM..SIOUX FALLS..PARKER..VERMILLION..AND BERESFORD.

THESE STORMS WERE PRODUCING VERY HEAVY RAINS..POSSIBLE SMALL HAIL..
AND WINDS TO 40 MPH.
KOSCIELSKI

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 5:50 PM CDTSevere Thunderstorm WarningFSDLake, McCook, Minnehaha, Turner55 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 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.