Alert archive / Wyoming / Tornado Warnings in 1997

Tornado Warning 13, NWS Cheyenne, WY

June 18, 1997Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 18, 1997, 2:03 PM MDT for Laramie County, Wyoming. It was in force for 32 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 18, 1997, 2:03 PM MDT (20:03 UTC)
Expired
Jun 18, 1997, 2:35 PM MDT
In force
32 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 19:56 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.

What was reported inside it

TimeReportWhereRemark
Jun 18, 2:15 PM MDTHail 1Cheyenne, WY
Jun 18, 2:25 PM MDTTornado F1Cheyenne, WYAnticyclonic tornado touched near intersection of Four Mile Road and College Drive, destroying a storage shed.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.1 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 1997-06-18Temperature 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 1997-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.1939Sfc1 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
2353 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
100 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.

230 
WFUS1 KCYS 182005 RRA
TORCYS
WYC021-182035-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
203 PM MDT WED JUN 18 1997

* TORNADO WARNING FOR
  SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 235 PM MDT

* SOME AFFECTED LOCATIONS INCLUDE
  CHEYENNE

* AT FUNNEL CLOUD WAS SPOTTED 5 MILES WEST OF CHEYENNE.  THIS STORM
  WAS MOVING EAST AT 15 MPH.  THIS FUNNEL COULD TOUCH DOWN AT ANY
  MOMENT.
 
 
GO TO A BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

&
DMM

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 2:38 PM MDTTornado WarningCYSLaramie32 min
Jun 18, 2:59 PM MDTSevere Thunderstorm WarningCYSLaramie46 min
Jun 18, 3:45 PM MDTSevere Thunderstorm WarningCYSLaramie30 min

Nearby

Tornado Warnings in Wyoming, 1997Every tornado warning in 1997Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.