Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 102, NWS Twin Cities, MN

July 27, 1987Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 27, 1987, 7:24 PM CDT for Sibley County, Minnesota. It was in force for 51 min.

The area

The counties it named.

The facts

Issued
Jul 27, 1987, 7:24 PM CDT (00:24 UTC)
Expired
Jul 27, 1987, 8:15 PM CDT
In force
51 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Sibley 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, 0.4 hours before the alert went out and 58 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 00:00Z on 1987-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1859 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 1987-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 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
1859 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
1071 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
177 m²/s²
Significant tornado parameter
0.7
Supercell composite
3.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 280024
SVRMSP
MNC143-280115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
724 PM CDT MON JUL 27 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

CENTRAL MINNESOTA...
 SIBLEY


AT..714 PM CDT..STRONG WINDS DOWNED TREES IN THE EXTREME
SOUTHWEST CORNER OF SCOTT COUNTY ABOUT 10 MILES EAST OF GAYLORD.

THE LINE OF THUNDERSTORMS PRODUCING THESE STRONG WINDS WAS
MOVING INTO EASTERN PARTS OF SIBLEY COUNTY AND THESE STORMS WILL
BE AFFECTING AREAS NEAR GAYLORD..HENDERSON AND WINTHROP AS IT
MOVES WEST SOUTHWEST AT 25 MPH.

REMEMBER SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH..DESTRUCTIVE HAIL..DEADLY LIGHTNING AND VERY HEAVY RAIN. ALSO
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH
LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED
TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED.

MATHEWS

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 27, 2:01 PM CDT, 5 hours 23 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
155 PM CDT MON JUL 27 1987

..VERY STRONG THUNDERSTORMS RUMBLE ACROSS NORTHWEST WISCONSIN..

AT 145 PM CDT..RADAR WAS SHOWING A BAND OF INTENSE THUNDERSTORMS LOCATED
ACROSS BARRON..NORTHEAST DUNN AND CHIPPEWA COUNTIES OF NORTHWEST WISCONSIN.

THESE INTENSE THUNDERSTORMS WERE OCCURRING IN THE TURTLE LAKE..RIDGELAND
SAND CREEK AND BLOOMER AREAS TO THE NORTHEAST OF CHIPPEWA FALLS AND
EAU CLAIRE. MOVEMENT TO THE SOUTHEAST AT 30 MILES AN HOUR WILL TAKE THESE
STRONG THUNDERSTORMS THROUGH AREAS NEAR EAU CLAIRE AND CHIPPEWA FALLS
THROUGH 3 PM THIS AFTERNOON.

STRONG GUSTY WINDS..FREQUENT LIGHTNING STRIKES..VERY HEAVY RAINS ALONG
WITH SMALL HAIL ARE LIKELY AS THESE STORMS MOVE THROUGH SOUTHERN
CHIPPEWA..EASTERN DUNN AND EAU CLAIRE COUNTIES.

ELSEWHERE..SHOWERS AND THUNDERSTORMS WERE LOCATED NEAR AND NORTH OF
LA CROSSE.

THIS PRECIPITATION WWAS ALSO MOVING SOUTHEAST AT 25 TO 30 MILES AN HOUR.
SWANBERG
Special weather statement, Jul 27, 6:43 PM CDT, 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
642 PM CDT MON JUL 27 1986

INTENSE THUNDERSTORMS CONTINUED OVER STEELE AND WASECA COUNTIES
NEAR THE TOWNS OF WASECA...NEW RICHMOND...BLOOMING AND OWATONNA.
THESE STORMS ARE CAPABLE OF PRODUCING SMALL HAIL...GUSTY WINDS AND VERY
HEAVY RAINS.

THE STORMS WERE MOVING TO THE SOUTHWEST AT 25 MILES AN HOUR. THE STORMS
WILL BE MOVING INTO FARIBAULT AND NORTHWEST FREEBORN COUNTIES AROUND
7 PM CDT. PERSONS IN THESE COUNTIES INCLUDING THE TOWNS OF WELLS...
BLUE EARTH AND BRUSH CREEK SHOULD BE PREPARED TO TAKE SHELTER IF
THREATENING WEATHER APPROACHES.

STRONG THUNDERSTORMS WERE LOCATED ABOUT 40 MILES SOUTHWEST OF THE TWIN
CITIES FROM GLENCOE TO GAYLORD TO LE SUEUR IN SIBLEY COUNTY. THESE
STORMS WERE ALSO MOVING SOUTHWEST AT 25 MILES AN HOUR. PERSONS
IN WINTHROP AND NICOLLET SHOULD TAKE SHELTER IF THREATENING WEATHER
APPROACHES.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 7:26 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn49 min
Jul 27, 8:13 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1987Every severe thunderstorm warning in 1987

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.