Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 148, NWS Twin Cities, MN

July 30, 1986Brown County, Nicollet County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 30, 1986, 5:14 AM CDT for Brown County, Nicollet County, Minnesota. It was in force for 46 min.

The area

The counties it named.

The facts

Issued: Jul 30, 1986, 5:14 AM CDT (10:14 UTC)
Expired: Jul 30, 1986, 6:00 AM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Brown County, MN, Nicollet 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, 10.2 hours before the alert went out and 93 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: 1530 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1238 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRST 301014
SVRRST
MNC015-103-301100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
514 AM CDT WED JUL 30 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 600 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTH CENTRAL MINNESOTA...NORTHERN BROWN AND NICOLLET

AT 500 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES
NORTHWEST OF NEW ULM MN. MOVI%NG EAST AT 30 MPH.

 A SEVERE THUNDERSTORM PRODUCES STRONG DAMAGING WINDS..LARGE HAIL
 ..VERY HEAVY RAIN AND DANGEROUS LIGHTNING.

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 30, 3:21 AM CDT, 1 hour 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
320 AM CDT WED JUL 30 1986

...THUNDERSTORMS DEVELOPING OVER GREATER TWIN CITIES METRO AREA...

AT 315 AM...THUNDERSTORMS WERE DEVELOPING RAPIDLY OVER HENNEPIN COUNTY
OF THE GREATER TWIN CITIES METRO AREA.  THESE THUNDERSTORMS EXTENDED
NORTHWARD THROUGH EASTERN WRIGHT INTO SHERBERN COUNTIES OF EAST CENTRAL
MINNESOTA.  A LARGE AREA OF THUNDERSHOWERS WAS MOVING INTO THE WESTERN
FRINGES THE GREATER TWIN CITIES METRO AREA...INCLUDING WESTERN SCOTT
AND WESTERN CARVER COUNTIES.  MOVEMENT OF THESE THUNDERSTORMS IS TO
EAST AT 35 MILES AN HOUR.  SMALL HAIL...STRONG GUSTY WINDS OF 30 TO
40 MILES AN HOUR...LIGHTNING...AND VEdRY HEAVY RAINFALL MAY BE EXPECTED
WITH THESE STORMS.  THEY WILL MOVE THROUGH THE CENTRAL PORTIONS OF THE
TWIN CITIES METRO AREA BETWEEN 330 AM AND 400 AM.
KRAFT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 12:17 AM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	43 min
Jul 30, 2:00 AM CDT	Severe Thunderstorm Warning	MPX	Big Stone, Lac qui Parle	60 min
Jul 30, 2:04 AM CDT	Severe Thunderstorm Warning	MPX	Redwood	56 min
Jul 30, 2:22 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Pope, Swift	38 min
Jul 30, 2:22 AM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	38 min
Jul 30, 3:00 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi	45 min
Jul 30, 3:00 AM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	45 min
Jul 30, 3:09 AM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville	26 min
Jul 30, 5:38 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur	52 min
Jul 30, 7:52 AM CDT	Severe Thunderstorm Warning	MPX	Olmsted, Wabasha, Winona	38 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.