Alert archive / Montana / Tornado Warnings in 1986

Tornado Warning 2, NWS Great Falls, MT

June 29, 1986Pondera County, Montana

NWS Great Falls, MT issued this tornado warning at Jun 29, 1986, 11:51 AM MDT for Pondera County, Montana. It was in force for 69 min.

The area

The counties it named.

The facts

Issued
Jun 29, 1986, 11:51 AM MDT (17:51 UTC)
Expired
Jun 29, 1986, 1:00 PM MDT
In force
69 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Pondera County, MT

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

Great Falls, MT (KGTF), launched 12:00Z, 5.9 hours before the alert went out and 108 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, Great Falls, MT at 12:00Z on 1986-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 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, Great Falls, MT at 12:00Z on 1986-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 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
23 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
997 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
71 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 KGTF 291751
TORGTF
MTC073-291900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
1151 AM MDT SUN JUN 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 100 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

NORTH CENTRAL MONTANA...EASTERN PONDERA AND THE CITY OF CONRAD

AT 1140 AM THE PUBLIC REPORTED A TORNADO ON THE GROUND ABOUT
10 MILES WEST OF CONRAD. THIS STORM IS MOVING TO THE EAST NEAR
20 MILES PER HOUR.

 PERSONS WITHIN THE TOWN OF CONRAD SHOULD TAKE COVER
 IMMEDIATELY.

The office that day

Everything else NWS Great Falls, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 1:16 PM MDTTornado WarningTFXChouteau74 min

Nearby

Tornado Warnings in Montana, 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.