Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 129, NWS Twin Cities, MN

July 26, 1986Yellow Medicine County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 26, 1986, 10:30 PM CDT for Yellow Medicine County, Minnesota. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: Jul 26, 1986, 10:30 PM CDT (03:30 UTC)
Expired: Jul 26, 1986, 11:30 PM CDT
In force: 60 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Yellow Medicine 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 00:00Z, 3.5 hours before the alert went out and 180 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 441 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 936 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 290 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 270330
SVRSTC
MNC173-270430-

BULLETIN-IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MN
1030 PM CDT SAT JUL 26 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1130 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF
CENTRAL  MINNESOTA...EASTERN YELLOW MEDICINE INCLUDING THE CITIES OF
GRANITE FALLS..WOOD LAKE..COTTONWOOD AND ECHO.

AT 1030 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM COMPLEX
REMAINING NORTHWEST OF REDWOOD FALLS IN WEST CENTRAL MINNESOTA.
MOVEMENT OF THIS INTENSE THUNDERSTORM IS SLOW AND ERRATIC.

LARGE HAIL..DANGEROUS LIGHTNING..HEAVY RAINFALL..AND DAMAGING WINDS
CAN BE EXPECTED FROM SEVERE THUNDERSTORMS..THIS CLUSTER OF
THUNDERSTORMS HAS ALREADY PRODUCED TORNADOES..LARGE HAIL AND VERY
HEAVY RAINFALLS.

IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE
IMMEDIATELY..AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO
RELAY YOUR SEVERE WEATHER REPORT TO THE LOCAL NATIONAL WEATHER
SERVICE OFFICE.

YOUNG

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 26, 7:13 PM CDT	Severe Thunderstorm Warning	MPX	Renville	47 min
Jul 26, 7:47 PM CDT	Tornado Warning	MPX	Renville	43 min
Jul 26, 8:36 PM CDT	Tornado Warning	MPX	Redwood, Renville	24 min
Jul 26, 9:10 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville	50 min
Jul 26, 9:35 PM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	55 min
Jul 26, 10:06 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville	54 min
Jul 26, 11:15 PM CDT	Severe Thunderstorm Warning	MPX	Pope	60 min
Jul 26, 11:23 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville	59 min
Jul 27, 3:47 PM CDT	Severe Thunderstorm Warning	MPX	Dakota	38 min
Jul 27, 5:26 PM CDT	Severe Thunderstorm Warning	MPX	Fillmore, Olmsted	49 min
Jul 27, 6:56 PM CDT	Severe Thunderstorm Warning	MPX	Fillmore, Mower	34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1986 Every 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.