Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 39, NWS Twin Cities, MN

July 11, 1987Wright County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 11, 1987, 6:45 AM CDT for Wright County, Minnesota. It was in force for 45 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, 6:45 AM CDT (11:45 UTC)
Expired
Jul 11, 1987, 7:30 AM CDT
In force
45 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Wright 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, 6:45 AM CDTThunderstorm Wind 76Wright, 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, 11.8 hours before the alert went out and 46 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°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 KMSP 111145
SVRMSP
MNC171-111230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
645 AM CDT SAT JUL 11 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 730 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

CENTRAL MINNESOTA...
 WRIGHT


AT 640 AM CDT TWIN CITIES RADAR INDICATED A SEVERE THUNDERSTORM
NEAR THE CITY LITCHFIELD OF MEEKER COUNTY IN CENTRAL MINNESOTA
ABOUT 60 MILES NORTHWEST OF DOWNTOWN MINNEAPOLIS. MOVEMENT OF
THIS SEVERE THUNDERSTORM WAS TO THE EAST NORTHEAST AT 35 MILES AN
HOUR. CITIES IN THE PATH OF THIS SEVERE THUNDERSTORM WERE COKATO..
ANNADALE AND BUFFALO.

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 PREPAREDg
TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED.

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, 5:50 AM CDTSevere Thunderstorm WarningMPXKandiyohi60 min
Jul 11, 6:15 AM CDTSevere Thunderstorm WarningMPXMeeker60 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.