Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 37, NWS Twin Cities, MN

July 11, 1987Kandiyohi County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 11, 1987, 5:50 AM CDT for Kandiyohi County, Minnesota. It was in force for 60 min. 1 report 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 11, 1987, 5:50 AM CDT (10:50 UTC)
Expired
Jul 11, 1987, 6:50 AM CDT
In force
60 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Kandiyohi 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

TimeReportWhereRemark
Jul 11, 6:00 AM CDTHail 0.75Kandiyohi, 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, 10.8 hours before the alert went out and 115 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 1987-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2006 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 1987-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.19395878Sfc1 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
2006 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1402 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
56 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 111059
SVRSTC
MNC067-111150-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MN
550 AM CDT SAT JUL 11 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 650 AM CDT FOR PEOPLE IN THE FOLLOWING
COUNTY OF

CENTRAL MINNESOTA...KANDIYOHI INCLUDING THE CITIES OF WILLMAR...
SPICER AND NEW LONDON.

AT 545 AM CDT RADAR SHOWED A SEVERE THUNDERSTORM 10 MILES SOUTH OF
WILLMAR MINNESOTA MOVING NORTHEAST AT 30 MPH.

REMEMBER SEVERE THUNDERSTORMS PRODUCE STRONG DAMAGING WINDS..LARGE
HAIL AND FREQUENT LIGHTNING STRIKES. ALSO SEVERE THUNDERSTORMS CAN
AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE
WARNING.H..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF
SAFETY IF ONE IS SPOTTED.

RUBIN

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 11, 12:40 AM CDT, 5 hours 10 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
1240 AM CDT SAT JUL 11 1987

AT 1230 AM...THUNDERSTORMS WITH HEAVY RAIN WERE OCCURRING OVER SCATTERED
SECTIONS OF CENTRAL...SOUTH CENTRAL...AND WEST CENTRAL MINNESOTA.  THEY
WERE LOCATED IN A 50 MILE WIDE AREA FROM LEECH LAKE TO BIG STONE LAKE
AND IN A 25 MILE WIDE AREA FROM REDWOOD FALLS TO NEW PRAGUE.  THE
STRONGEST THUNDERSTORMS WERE IN THE MOTLEY...PINE RIVER AREA OF CENTRAL
MINNESOTA AND MAY PRODUCE HAIL...STRONG GUSTY WINDS...FREQUENT LIGHTNING
AND HEAVY RAINFALL.  PERSONS ENGAGED IN OUTDOOR ACTIVITIES SUCH AS
FISHING OR CAMPING SHOULD TAKE APPROPRIATE SAFTEY PRECAUTIONS.

MOVEMENT WAS TO THE EA=ST AT 30 MILES AN HOUR.
KRAFT
Special weather statement, Jul 11, 1:27 AM CDT, 4 hours 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST. CLOUD MN
120 AM CDT SAT JULY 11 1987

...THUNDERSTORMS WERE MOVING TOWARD MILLE LACS LAKE...

AT 115 AM CDT RADAR SHOWED A LINE OF THUNDERSTORMS MOVING TOWARD
MILLE LACS LAKE AT 30 MPH AND WILL BE AFFECTING THE LAKE AREA FROM
120 AM TO 300 AM.

NO SEVERE WEATHER HAS BEEN REPORTED AT THIS TIME OR IS INDICATED ON
RADAR. HOWEVER THESE THUNDERSTORMS MAY PRODUCE GUSTY WIND$S AND
FREQUENT LIGHTNING STRIKES...BOATERS...FISHERPERSONS...AND OTHERS
ENGAGED IN OUTDOOR ACTIVITIES IN THE AFFECTED AREA SHOULD TAKE
NECESSARY PRECAUTIONS.

NISTLER
Special weather statement, Jul 11, 1:37 AM CDT, 4 hours 13 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
130 AM CDT SAT JUL 11 1987

AT 130 AM...THUNDERSTORMS WITH VERY HEAVY RAIN WERE OCCURRING OVER
SECTIONS OF CENTRAL...EAST CENTRAL...AND WEST CENTRAL MINNESOTA.  THEY
WERE LOCATED IN A 75 MILE WIDE AREA FROM GRAND RAPIDS TO ALEXANDRIA.
THE STRONGEST THUNDERSTORMS WERE IN THE AITKIN...HILL CITY AREA OF CENTRAL
MINNESOTA.  THEY MAY PRODUCE HAIL...STRONG GUSTY WINDS...FREQUENT
LIGHTNING AND VERY HEAVY RAINFALL.  PERSONS ENGAGED IN OUTDOOR ACTIVITIES
SUCH AS FISHING OR CAMPING SHOULD TAKE APPROPRIATE SAFTEY PRECAUTIONS.

THUNDERSTORMS DEVELOPED RAPIDLY SINCE 1230 AM OVER THE SOUTHWEST
SECTIONS OF THE GREAT,ER TWIN CITIES METROPOLITAN AREA OF EAST CENTRAL
MINNESOTA.

MOVEMENT WAS TO THE EAST AT 35 MILES AN HOUR.
KRAFT
Special weather statement, Jul 11, 5:35 AM CDT, 15 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
535 AM CDT SAT JUL 11 1987

...SEVERE THUNDERSTORM WRNING FOR COTTONWOOD AND JACKSON COUNTIES OF
   SOUTHWEST MINNESOTA UNTIL 615 AM CDT THIS SATURDAY MORNING.....

AT 515 AM VERY HEAVY THUNDERSTORMS WERE APPROACHING THE MINNESOTA RIVER
BETWEEN GRANITE FALLS AND REDWOOD FALLS ALONG THE REDWOOD AND RENVILLE
COUNTY LINE IN SOUTHWEST MINNESOTA. THESE THUNDERSTORMS WERE PRODUCING
HEAVY RAINS..SMALL HAIL AND GUSTY WINDS TO 40 MPH. NO SEVERE WEATHER HAD
AS YET BEEN REPORTED WITH THESE THUNDERSTORMS BUT TO THE SOUTH HEAVIER
THUNDERSTORMS WERE MOVING OUT OF MURRAY AND NOBLES COUNTIES INTO
COTTONWOOD AND JACKSON COUNTIES OF SOUTHWEST MINNESOTA. THESE THUNDER-
STORMS WERE INDICATED AS SEVERE AND WARNINGS HAVE BEEN ISSUED FOR PORTIONS
OF THESE COUNTIES UNTIL 615 AM CDT THIS SATURDAY MORNING FOR LARGE HAIL
AND STRONG SURFACE WINDS.

ADDITIONAL SHOWERS AND THUNDERSTORMS WERE ALSO INDICATED OVER PORTIONS OF
CENTRAL MINNESOTA AND NORTHWEST WISCONSIN. SCATTERED LIGHT RAINSHOWRS WERE
LOCATED BETWEEN PRINCETON AND LAKE MILLE LACS IN CENTRAL MINNESOTA AND
SCATTERED HEAVY THUNDERSTORMS WERE LOCATED BET5WEEN SPOONER AND HAYWARD
IN NORTHWEST WISCONSIN.

MOVEMENT OF THESE SHOWER AND THUNDERSTORM AREAS WAS TO THE EAST NORTHEAST
AT 25 TO 30 MILES AN HOUR.
DOMBROWSKY

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 10:00 PM CDTSevere Thunderstorm WarningMPXTodd60 min
Jul 10, 10:20 PM CDTTornado WarningMPXTodd25 min
Jul 11, 12:16 AM CDTSevere Thunderstorm WarningMPXCarver, Scott, Sibley44 min
Jul 11, 3:20 AM CDTSevere Thunderstorm WarningMPXLac qui Parle, Yellow Medicine60 min
Jul 11, 4:20 AM CDTSevere Thunderstorm WarningMPXYellow Medicine60 min
Jul 11, 6:15 AM CDTSevere Thunderstorm WarningMPXMeeker60 min
Jul 11, 6:45 AM CDTSevere Thunderstorm WarningMPXWright45 min
Jul 11, 7:11 AM CDTSevere Thunderstorm WarningMPXWatonwan49 min
Jul 11, 7:19 AM CDTSevere Thunderstorm WarningMPXHennepin, Sherburne21 min
Jul 11, 7:19 AM CDTSevere Thunderstorm WarningMPXAnoka, Isanti56 min
Jul 11, 7:42 AM CDTSevere Thunderstorm WarningMPXBlue Earth48 min
Jul 11, 7:52 AM CDTSevere Thunderstorm WarningMPXWashington28 min
Jul 11, 7:52 AM CDTSevere Thunderstorm WarningMPXChisago38 min
Jul 11, 4:47 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn53 min
Jul 11, 4:47 PM CDTSevere Thunderstorm WarningMPXMartin53 min
Jul 11, 5:31 PM CDTSevere Thunderstorm WarningMPXDodge, Freeborn, Steele44 min
Jul 11, 5:48 PM CDTSevere Thunderstorm WarningMPXWabasha, Winona42 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.