Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 107, NWS Sioux Falls, SD

July 15, 1986Cottonwood County, Jackson County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 15, 1986, 11:01 AM CDT for Cottonwood County, Jackson County, Minnesota. It was in force for 29 min.

The area

The counties it named.

The facts

Issued
Jul 15, 1986, 11:01 AM CDT (16:01 UTC)
Expired
Jul 15, 1986, 11:30 AM CDT
In force
29 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Cottonwood County, MN, Jackson County, MN

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

Minneapolis, MN (KSTC), launched 12:00Z, 4.0 hours before the alert went out and 168 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, Minneapolis, MN at 12:00Z on 1986-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 1986-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.193958Sfc1 km3 km6 km9 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
NaN m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

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, Jul 15, 5:37 AM CDT, 5 hours 24 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
535 AM CDT TUE JUL 15 1986

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF NORTH CENTRAL
AND NORTHEAST SOUTH DAKOTA UNTIL 6 AM CDT...

AT 535 AM CDT... THERE WERE SCATTERED INTENSE THUNDERSTORMS WITH VERY
HEAVY RAIN IN NORTHEAST SOUTH DAKOTA EXTENDING INTO SOUTHEAST NORTH
DAKOTA AND WESTERN MINNESOTA. THESE STORMS MAY PRODUCE HAIL AND STRONG
GUSTY W'IND.
THUNDERSTORMS   WERE NORTHEAST OF A LINE FROM 30 MILES SOUTHEAST OF
MOBRIDGE TO NEAR WATERTOWN.
THE STRONGEST STORM WAS 40 MILES NORTHWEST OF WATERTOWN NEAR WEBSTER.

THUNDERSTORMS WERE MOVING EAST AT 30 MILES AN HOUR.
PRESTON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 8:59 AM CDTSevere Thunderstorm WarningFSDLyon61 min
Jul 15, 10:04 AM CDTSevere Thunderstorm WarningFSDCottonwood, Jackson, Nobles56 min
Jul 15, 10:04 AM CDTSevere Thunderstorm WarningFSDMurray56 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.