Alert archive / Minnesota / Tornado Warnings in 1987

Tornado Warning 12, NWS Twin Cities, MN

July 6, 1987Washington County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 6, 1987, 3:42 PM CDT for Washington County, Minnesota. It was in force for 28 min.

The area

The counties it named.

The facts

Issued
Jul 6, 1987, 3:42 PM CDT (20:42 UTC)
Expired
Jul 6, 1987, 4:10 PM CDT
In force
28 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Washington 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 12:00Z, 8.7 hours before the alert went out and 60 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 12:00Z on 1987-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 216 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 12:00Z on 1987-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 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
216 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
759 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
-32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 062042
TORMSP
MNC163-062145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
342 PM CDT MON JUL 6 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 445 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

EAST CENTRAL MINNESOTA...WASHINGTON


AT 335 A TORNADO WAS REPORTED ON THE GROUND FROM THE WASHINGTON
COUNTY SHERIFF IN CENTRAL WASHINGTON COUNTY MOVING EAST AT 15 TO
20 MILES AN HOUR. PERSONS IN THE ST CRPIX BEACH AREA SHOULD BE
ALERT FOR TORNADOS.

THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE IN
THE PATH OF A TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE.
OTHERWISE..GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR
POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES FOR A
REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

CAMPBELL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 12:36 PM CDTSevere Thunderstorm WarningMPXOlmsted44 min

Nearby

Tornado Warnings in Minnesota, 1987Every tornado warning in 1987Tornadoes 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.