Alert archive / Wyoming / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 97, NWS Cheyenne, WY

August 13, 1997Goshen County, Platte County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 13, 1997, 5:56 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 44 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, 5:56 PM MDT (23:56 UTC)
Expired
Aug 13, 1997, 6:40 PM MDT
In force
44 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

Counties Goshen County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 107 km from the middle of the area, began a volume at 23:59 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

Rapid City, SD (KUNR), launched 12:00Z, 11.9 hours before the alert went out and 261 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 1997-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 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 1997-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 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
37 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
1364 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
241 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 132357 RRA
SVRCYS
WYC015-031-140040-

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

* SEVERE THUNDERSTORM WARNING FOR
  NORTHERN PLATTE COUNTY IN SOUTHEASTERN WYOMING
  NORTHERN GOSHEN COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 640 PM MDT

* SOME LOCATIONS AFFECTED
  GUERNSEY                             BY 607 PM MDT
  HARTVILLE                            BY 608 PM MDT
  CAMP GUERNSEY                        BY 610 PM MDT
  SUNRISE                              BY 611 PM MDT

* AT 551 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR 40 MILES NORTHWEST OF TORRINGTON OR 8 MILES WEST OF GUERNSEY
  MOVING EAST AT 25 MPH.
 
AT 545 PM...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN
NORTHERN PLATTER COUNTY WYOMING 10 MILES WEST OF GUERNSEY.
DAMAGING WIND GUSTS IN EXCESS OF 65 MPH.
 
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, 5:36 PM MDTSevere Thunderstorm WarningCYSLaramie29 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.