Alert archive / Wyoming / Tornado Warnings in 2006

Tornado Warning 3, NWS Cheyenne, WY

May 21, 2006Converse County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 21, 2006, 12:33 PM MDT for Converse County, Wyoming. It was in force for 27 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
May 21, 2006, 12:33 PM MDT (18:33 UTC)
Expired
May 21, 2006, 1:00 PM MDT
In force
27 min
Issued by
NWS Cheyenne, WY
Area
Counties, with a storm outline in the text

County Converse County, WY

The radar

The Cheyenne radar (KCYS), 193 km from the middle of the area, began a volume at 18:33 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

Riverton, WY (KRIW), launched 12:00Z, 6.6 hours before the alert went out and 234 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, Riverton, WY at 12:00Z on 2006-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 279 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2006-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 square meters per square second.193958Sfc1 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
279 J/kg
Mixed-layer CIN
-288 J/kg
Mixed-layer LCL
1777 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
166 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS55 KCYS 211834
TORCYS
WYC009-211900-
/O.NEW.KCYS.TO.W.0003.060521T1833Z-060521T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
1233 PM MDT SUN MAY 21 2006

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL CONVERSE COUNTY IN EAST CENTRAL WYOMING...
  THIS INCLUDES THE CITY OF DOUGLAS...

* UNTIL 100 PM MDT

* AT 1226 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD
  ABOUT 5 TO 10 MILES WEST OF DOUGLAS...MOVING EAST AT 20 MPH.
  THE FUNNEL MAY BRIEFLY TOUCHDOWN THROUGH 1 PM.

* THE POSSIBLE TORNADO IS EXPECTED TO BE NEAR...
  DOUGLAS BY 100 PM MDT...

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.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4286 10575 4264 10567 4270 10521 4294 10534

$$
2 follow-up statements
000 
WWUS55 KCYS 211846
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1245 PM MDT SUN MAY 21 2006

WYC009-211900-
/O.CON.KCYS.TO.W.0003.000000T0000Z-060521T1900Z/
CONVERSE WY-
1245 PM MDT SUN MAY 21 2006

...A TORNADO WARNING CONTINUES UNTIL 100 PM MDT FOR CENTRAL CONVERSE
COUNTY...

AT 1245 PM MDT...WEATHER SPOTTERS STILL CAN SEE A FUNNEL CLOUD JUST 
WEST OF DOUGLAS. NO REPORTS OF THE FUNNEL TOUCHING DOWN HAVE BEEN 
RECEIVED SO FAR.  THE PARENT STORM WAS MOVING EAST AT 25 MPH.

THE FUNNEL CLOUDY OR POSSIBLE TORNADO WILL BE NEAR...
  DOUGLAS BY 100 PM MDT...

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.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4286 10575 4264 10567 4270 10521 4294 10534

$$
000 
WWUS55 KCYS 211900
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
100 PM MDT SUN MAY 21 2006

WYC009-211910-
/O.EXP.KCYS.TO.W.0003.000000T0000Z-060521T1900Z/
CONVERSE WY-
100 PM MDT SUN MAY 21 2006

...THE TORNADO WARNING FOR CENTRAL CONVERSE COUNTY EXPIRES AT 100 PM
MDT...

AT 1257PM SPOTTERS REPORT THAT THE FUNNEL HAS DISSIPATED IN THE 
VICINITY OF DOUGLAS.  THE PARENT STORM LOCATED JUST WEST OF DOUGLAS 
WAS ALSO WEAKENING.  HENCE...THE WARNING WILL EXPIRE AT 1 PM.

NO REPORTS OF A TOUCHDOWN HAVE BEEN RECEIVED HERE AT THE NATIONAL 
WEATHER SERVICE SO FAR.


LAT...LON 4286 10575 4264 10567 4270 10521 4294 10534

$$

Nearby

Tornado Warnings in Wyoming, 2006Every tornado warning in 2006Tornadoes in 2006

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.