Alert archive / Minnesota / Tornado Warnings in 1987

Tornado Warning 12, NWS Grand Forks, ND

July 31, 1987Kittson County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Jul 31, 1987, 5:38 PM CDT for Kittson County, Minnesota. It was in force for 37 min.

The area

The counties it named.

The facts

Issued
Jul 31, 1987, 5:38 PM CDT (22:38 UTC)
Expired
Jul 31, 1987, 6:15 PM CDT
In force
37 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Kittson 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

International Fa, MN (KINL), launched 12:00Z, 10.6 hours before the alert went out and 257 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, International Fa, MN at 12:00Z on 1987-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 128 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 12:00Z on 1987-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 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
128 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
872 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 312239
TORFAR
MNC069-312315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE FARGO ND
538 PM CDT FRI JUL 31 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 615 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHWEST MINNESOTA...EASTERN KITTSON

AT 530 PM CDT A FUNNEL CLOUD WAS REPORTED BY THE KITTSON COUNTY
SHERIFFS OFFICE 1 1/2 MILES SOUTH OF LAKE BRONSON MINNESOTA..
OR ABOUT 5 MILES SOUTHEAST OF THE CITY OF LAKE BRONSON.  RADAR
INDICATED A SEVERE THUNDERSTORMS DEVELOPING RAPIDLY IN THIS AREA
MOVING EAST AT 10 MILES AN HOUR.

THIS STORM IS ACCOMPANIED BY INTENSE LIGHTNING...LARGE HAIL...AND
DANGEROUS STRAIGHT LINE WINDS.
THIS STORM MAY ALSO CAUSE FLOODING OF SMALL STREAMS AND UNDERPASSES.

EWENS

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.