Alert archive / Wyoming / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 85, NWS Cheyenne, WY

August 12, 1986Goshen County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 12, 1986, 2:20 PM MDT for Goshen County, Wyoming. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Aug 12, 1986, 2:20 PM MDT (20:20 UTC)
Expired
Aug 12, 1986, 2:50 PM MDT
In force
30 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Goshen 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, 8.3 hours before the alert went out and 251 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 1986-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 315 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, Rapid City, SD at 12:00Z on 1986-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 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
315 J/kg
Mixed-layer CIN
-148 J/kg
Mixed-layer LCL
2188 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 12, 12:39 PM MDT, 1 hour 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1235 PM MDT TUE AUG 12 1986

...SEVERAL STRONG THUNDERSTORMS IN ALBANY COUNTY...

AT 1230PM CHEYENNE RADAR INDICATED SEVERAL STRONG THUNDERSTORMS IN
ALBANY COUNTY.  THE STRONGEST STORM WAS ABOUT 5 MILES NORTH OF ROCK
RIVER.

STRONG GUSTY WINDS...BRIEFLY HEAVY RAIN AND SMALL HAIL SHOULD BE
EXPECTED WITH THE HEAVIER THUNDERSTORMS IN ALBANY COUNTY.

MOVEMENT WAS TO THE EAST AT AN UNDETgERMINED SPEED.
COX

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 12, 5:15 PM MDTSevere Thunderstorm WarningCYSWeston60 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1986Every severe thunderstorm warning 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.