Alert archive / Wyoming / Tornado Warnings in 2002

Tornado Warning 12, NWS Cheyenne, WY

August 29, 2002Platte County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Aug 29, 2002, 3:09 PM MDT for Platte County, Wyoming. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 29, 2002, 3:09 PM MDT (21:09 UTC)
Expired: Aug 29, 2002, 3:45 PM MDT
In force: 36 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Platte County, WY

The radar

The Cheyenne radar (KCYS), 70 km from the middle of the area, began a volume at 21:10 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 29, 2:45 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 9.2 hours before the alert went out and 253 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 55 J/kg
Mixed-layer CIN: -409 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -7 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.

847 
WFUS55 KCYS 292109
TORCYS
WYC031-292145-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
309 PM MDT THU AUG 29 2002

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN PLATTE COUNTY IN SOUTHEAST WYOMING

* UNTIL 345 PM MDT

* AT 305 PM MDT...SPOTTERS INDICATED A SEVERE THUNDERSTORM WITH A
  POSSIBLE TORNADO NEAR CHUGWATER...OR ABOUT 22 MILES SOUTH OF
  WHEATLAND...MOVING NORTHEAST AT 20 MPH.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

&&

WCJIN-WYSE

LAT...LON 4175 10506 4165 10489 4167 10466 4208 10468

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 6:15 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	45 min
Aug 28, 7:00 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	60 min
Aug 28, 7:22 PM MDT	Tornado Warning	CYS	Laramie	38 min
Aug 29, 3:09 PM MDT	Tornado Warning	CYS	Platte	36 min
Aug 29, 3:42 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	33 min

Nearby

Tornado Warnings in Wyoming, 2002 Every tornado warning in 2002 Tornadoes in 2002

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.