Alert archive / Wyoming / Tornado Warnings in 2009

Tornado Warning 4, NWS Cheyenne, WY

June 5, 2009Goshen County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 5, 2009, 3:49 PM MDT for Goshen County, Wyoming. It was in force for 26 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 5, 2009, 3:49 PM MDT (21:49 UTC)
Expired: Jun 5, 2009, 4:15 PM MDT
In force: 26 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

County Goshen County, WY

The radar

The Cheyenne radar (KCYS), 70 km from the middle of the area, began a volume at 21:52 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

Time	Report	Where	Remark
Jun 5, 4:07 PM MDT	TORNADO 2	11 W La Grange, WY	TORNADO TOUCHDOWN. MOVING TO THE EAST.
Jun 5, 4:07 PM MDT	TORNADO	11 W La Grange, WY	MOVING TO THE EAST.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 5, 2:48 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 9.8 hours before the alert went out and 224 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: 997 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 1029 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
WFUS55 KCYS 052149
TORCYS
WYC015-052215-
/O.NEW.KCYS.TO.W.0004.090605T2149Z-090605T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
349 PM MDT FRI JUN 5 2009

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN GOSHEN COUNTY IN SOUTHEAST WYOMING...

* UNTIL 415 PM MDT

* AT 349 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 13 MILES NORTHWEST OF MERIDEN REST AREA...OR 33
  MILES SOUTHWEST OF TORRINGTON...AND MOVING EAST AT 25 MPH.

* THIS TORNADIC STORM WILL AFFECT MAINLY RURAL AREAS OF SOUTHWESTERN
  GOSHEN COUNTY...INCLUDING THE FOLLOWING LOCATIONS HWY 85 MM 60 AND
  HWY 85 AT HIGHWAY 151.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4174 10420 4157 10426 4164 10464 4176 10459
TIME...MOT...LOC 2149Z 280DEG 21KT 4166 10451

$$

SJC

2 follow-up statements

000 
WWUS55 KCYS 052201
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
401 PM MDT FRI JUN 5 2009

WYC015-052215-
/O.CON.KCYS.TO.W.0004.000000T0000Z-090605T2215Z/
GOSHEN WY-
401 PM MDT FRI JUN 5 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR SOUTHERN
GOSHEN COUNTY...

AT 358 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS 
DANGEROUS STORM WAS LOCATED 10 MILES WEST OF HWY 85 MM 60...OR 32 
MILES SOUTHWEST OF TORRINGTON...MOVING EAST AT 25 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4175 10450 4174 10420 4157 10426 4162 10451
TIME...MOT...LOC 2200Z 280DEG 21KT 4165 10442

$$

SJC

000 
WWUS55 KCYS 052207
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
407 PM MDT FRI JUN 5 2009

WYC015-052215-
/O.CON.KCYS.TO.W.0004.000000T0000Z-090605T2215Z/
GOSHEN WY-
407 PM MDT FRI JUN 5 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR SOUTHERN
GOSHEN COUNTY...

AT 403 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS 
DANGEROUS STORM IS PRODUCING A TORNADO 8 MILES WEST OF HWY 85 MM 
60...OR 11 MILES WEST OF LA GRANGE...MOVING EAST AT 25 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4161 10446 4174 10442 4174 10420 4157 10426
TIME...MOT...LOC 2205Z 280DEG 21KT 4164 10439

$$

SJC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 6:08 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
Jun 4, 6:56 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	42 min
Jun 5, 2:47 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	58 min
Jun 5, 3:06 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	54 min
Jun 5, 3:27 PM MDT	Tornado Warning	CYS	Goshen, Platte	33 min
Jun 5, 4:10 PM MDT	Tornado Warning	CYS	Goshen, Laramie	35 min
Jun 5, 4:26 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	26 min
Jun 5, 4:42 PM MDT	Tornado Warning	CYS	Goshen, Laramie	21 min

Nearby

Tornado Warnings in Wyoming, 2009 Every tornado warning in 2009 Tornadoes in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.