Alert archive / North Dakota / Tornado Warnings in 1986

Tornado Warning 7, NWS Grand Forks, ND

July 10, 1986Cass County, North Dakota; Clay County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Jul 10, 1986, 4:42 PM CDT for Cass County, North Dakota; Clay County, Minnesota. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Jul 10, 1986, 4:42 PM CDT (21:42 UTC)
Expired
Jul 10, 1986, 5:30 PM CDT
In force
48 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Clay County, MN, Cass County, ND

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

Aberdeen, SD (KHON), launched 12:00Z, 9.7 hours before the alert went out and 253 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, Aberdeen, SD at 12:00Z on 1986-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1117 joules per kilogram.LCLEL10008507005003002001001 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, Aberdeen, SD at 12:00Z on 1986-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.1939587897Sfc1 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
1117 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
492 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 102142
TORFAR
NDC017-MNC027-102230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE FARGO ND
442 PM CDT THU JUL 10 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

EAST CENTRAL NORTH DAKOTA...CASS AND THE CITIES OF FARGO/MOORHEAD
NORTHWEST MINNESOTA...WESTERN CLAY

AT 423 PM CDT A FUNNEL CLOUD WAS REPORTED BY STATE RADIO 2 MILES
WEST OF AMENIA ND

IF A TORNADO IS APPROACHING GET INTO A BASEMENT...IF NO BASEMENT
IS AVAILABLE...GET INTO THE INNERMOST HALLWAY...STAY AWAY FROM
WINDOWS.  IF CAUGHT OUTSIDE GET INTO A DITCH...GULLY...RAVINE...OR
EVEN A LOW LYING SPOT ON THE GROUND.  PROTECT YOUR HEAD.  ABANDON
CARS AND MOBILE HOMES.

DM/RA

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 10, 1:51 PM CDTTornado WarningFGFGrand Forks, Steele69 min
Jul 10, 4:31 PM CDTTornado WarningFGFGrand Forks, Steele59 min
Jul 10, 5:35 PM CDTSevere Thunderstorm WarningFGFCass55 min
Jul 10, 5:35 PM CDTSevere Thunderstorm WarningFGFTraill55 min
Jul 10, 6:36 PM CDTTornado WarningFGFCass54 min

Nearby

Tornado Warnings in North Dakota, 1986Tornado Warnings in Minnesota, 1986Every tornado warning in 1986Tornadoes in 1986

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.