Alert archive / Wyoming / Tornado Warnings in 1997

Tornado Warning 30, NWS Cheyenne, WY

August 3, 1997Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Aug 3, 1997, 4:00 PM MDT for Laramie County, Wyoming. It was in force for 45 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 3, 1997, 4:00 PM MDT (22:00 UTC)
Expired
Aug 3, 1997, 4:45 PM MDT
In force
45 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 22:03 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, 10.0 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 1997-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 25 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, Denver, CO at 12:00Z on 1997-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
25 J/kg
Mixed-layer CIN
-323 J/kg
Mixed-layer LCL
1749 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
24 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 032159 RRA
TORCYS
WYC021-032245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
400 PM MDT SUN AUG 3 1997

* TORNADO WARNING FOR
  SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 445 PM MDT

* SOME LOCATIONS AFFECTED
  CHEYENNE

* AT 358 PM...A TORNADO WAS SPOTTED 10 MILES NORTHEAST OF CHEYENNE.
  NO MOVEMENT WAS DETECTED.

A TORNADO IS ON THE GROUND!  TAKE SHELTER NOW!
&
WCJIN-WYSE
JMR

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 7:57 PM MDTSevere Thunderstorm WarningCYSLaramie33 min
Aug 3, 2:38 PM MDTSevere Thunderstorm WarningCYSAlbany42 min
Aug 3, 3:24 PM MDTSevere Thunderstorm WarningCYSAlbany41 min
Aug 3, 3:32 PM MDTSevere Thunderstorm WarningCYSAlbany43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.