Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 95, NWS Cheyenne, WY

August 13, 1997Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 13, 1997, 5:36 PM MDT for Laramie County, Wyoming. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 13, 1997, 5:36 PM MDT (23:36 UTC)
Expired
Aug 13, 1997, 6:05 PM MDT
In force
29 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 23:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.6 hours before the alert went out and 202 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, Denver, CO at 12:00Z on 1997-08-13Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1997-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
1924 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
18 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 KCYS 132337 RRA
SVRCYS
WYC021-140005-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
536 PM MDT WED AUG 13 1997

* SEVERE THUNDERSTORM WARNING FOR
  NORTHEASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 605 PM MDT

* SOME LOCATIONS AFFECTED
  ALBIN                                BY 559 PM MDT

* AT 531 PM MDT...A SEVERE THUNDERSTORM WAS REPORTED BY A SPOTTER 35
  MILES NORTHEAST OF CHEYENNE OR 13 MILES NORTHWEST OF ALBIN MOVING
  SOUTHEAST AT 25 MPH.


 
AT 520 PM...FEW AIR FORCE BASE WEATHER REPORTED A WIND GUST TO 63 MPH
WITH A THUNDERSTORM AT ONE OF THE MISSILE SITES IN NORTHEAST LARAMIE
COUNTY WYOMING.
 
STRONG WINDS WITH THIS STORM MAY CAUSE INJURY OR DAMAGE.  TAKE SHELTER
INSIDE A STURDY BUILDING AWAY FROM ALL DOORS AND WINDOWS.

WCJIN-WYSE
PAL

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 5:56 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte44 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1997Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.