Alert archive / Montana / Tornado Warnings in 1986

Tornado Warning 4, NWS Billings, MT

September 4, 1986Golden Valley County, Yellowstone County, Montana

NWS Billings, MT issued this tornado warning at Sep 4, 1986, 7:56 PM MDT for Golden Valley County, Yellowstone County, Montana. It was in force for 34 min.

The area

The counties it named.

The facts

Issued
Sep 4, 1986, 7:56 PM MDT (01:56 UTC)
Expired
Sep 4, 1986, 8:30 PM MDT
In force
34 min
Issued by
NWS Billings, MT
Area
Whole counties

Counties Golden Valley County, MT, Yellowstone 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 (KTFX), launched 00:00Z, 1.9 hours before the alert went out and 203 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 00:00Z on 1986-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 1986-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3555 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
112 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 KBIL 050158
TORBIL
MTC037-111-050230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BILLINGS MT
756 PM MDT THU SEP 4 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 830 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

MONTANA...EXTREME SOUTHEAST GOLDEN VALLEY AND EXTREME NORTHWEST
YELLOWSTONE...INCLUDING THE TOWN OF BROADVIEW.

AT 750 PM MDT RADAR INDICATED A POSSIBLE TORNADO 10 MILES
SOUTH OF LAVINA...IN EXTREME SOUTHEAST GOLDEN VALLEY COUNTY.
MOVEMENT WAS SOUTHEAST AT AROUND 25 MPH.

IF THREATENING WEATHER APPROACHES GO TO A SAFE PLACE IMMEDIATELY.
NOLL

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 7:09 PM MDTTornado WarningBYZGolden Valley36 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.