Alert archive / Wyoming / Tornado Warnings in 1986

Tornado Warning 13, NWS Cheyenne, WY

June 27, 1986Weston County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 27, 1986, 4:50 PM MDT for Weston County, Wyoming. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
Jun 27, 1986, 4:50 PM MDT (22:50 UTC)
Expired
Jun 27, 1986, 5:30 PM MDT
In force
40 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Weston County, WY

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

Rapid City, SD (KRAP), launched 12:00Z, 10.8 hours before the alert went out and 137 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, Rapid City, SD at 12:00Z on 1986-06-27Temperature 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, Rapid City, SD at 12:00Z on 1986-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2065 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
103 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 KCYS 272308 COR
TORSHR
WYC045-272330-

BULLETIN-- IMMEDIATE ACTION REQUESTED
TORNADO WARNING ...CORRECTION...
NATIONAL WEATHER SERVICE SHERIDAN WY
ISSUED BY WEATHER SERVICE CHEYENNE WY
505 PM MDT FRI JUN 27 1986

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

NORTHEAST WYOMING..WESTON

THUNDERSTORMS HAVE SPAWNED SEVERAL SMALL TORNADOES 5 TO 6 MILES
SOUTHWEST OF NEWCASTLE. THESE TORNADOES HAVE DISIPATED BUT CONDITIONS
REMAIN RIPE FOR NEW TORNADO FORMATION AS THUNDERSTORMS MOVE EASTWARD
THROUGH WESTON COUNTY.

PEOPLE IN THE PATH OF A TORNADO SHOULD MOVE TO A SHELTER BELOW
GROUND...IF AVAILABLE. OTHERWISE...TO A SMALL CENTRAL INTERIOR
ROOM ON THE LOWEST FLOOR POSSIBLE. ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING
SIGLER

Nearby

Tornado Warnings in Wyoming, 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.