Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 149, NWS Twin Cities, MN

July 30, 1986Blue Earth County, Le Sueur County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 30, 1986, 5:38 AM CDT for Blue Earth County, Le Sueur County, Minnesota. It was in force for 52 min. 2 reports 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: Jul 30, 1986, 5:38 AM CDT (10:38 UTC)
Expired: Jul 30, 1986, 6:30 AM CDT
In force: 52 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Blue Earth County, MN, Le Sueur County, MN

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
Jul 30, 5:51 AM CDT	Thunderstorm Wind 55	Blue Earth, MN
Jul 30, 6:00 AM CDT	Thunderstorm Wind 0	Blue Earth, MN

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

Minneapolis, MN (KSTC), launched 00:00Z, 10.6 hours before the alert went out and 76 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 301038
SVRRST
MNC013-079-301130-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 630 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTH CENTRAL MINNESOTA...BLUE EARTH AND LESUEUR

AT 525 AM CDT RADAR INDICATED A LINE OF THUNDERSTORMS FROM
NICOLLET IN SOUTHERN NICOLLET COUNTYB TO LEWISVILLE IN
SOUTHEAST WATONWAN COUNTY OF MINNESOTA MOVING TO THE 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, 2 hours 17 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, 5:14 AM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet	46 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.