Alert archive / Wyoming / Tornado Warnings in 2007

Tornado Warning 6, NWS Cheyenne, WY

June 28, 2007Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 28, 2007, 4:53 PM MDT for Laramie County, Wyoming. It was in force for 37 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 28, 2007, 4:53 PM MDT (22:53 UTC)
Expired: Jun 28, 2007, 5:30 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 13 km from the middle of the area, began a volume at 22:54 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 28, 4:55 PM MDT	HAIL 1.75	7 S Cheyenne, WY
Jun 28, 5:30 PM MDT	HAIL 1	6 Sse Cheyenne, WY	QUARTER AND DIME SIZE HAIL FROM MULTIPLE REPORTS.

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

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.9 hours before the alert went out and 190 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: 696 J/kg
Mixed-layer CIN: -276 J/kg
Mixed-layer LCL: 1338 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 63 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 
WFUS55 KCYS 282253
TORCYS
WYC021-282330-
/O.NEW.KCYS.TO.W.0006.070628T2253Z-070628T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
453 PM MDT THU JUN 28 2007

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 530 PM MDT

* AT 446 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO OVER
  EXTREME SOUTH CENTRAL LARAMIE COUNTY...OR ABOUT 11 MILES SOUTHWEST
  OF CHEYENNE...MOVING NORTHEAST AT 5 MPH. THIS DOES NOT INCLUDE THE
  CITY OF CHEYENNE. 

* THE TORNADO WILL BE NEAR...
  RURAL SOUTHERN LARAMIE COUNTY AT 510 PM MDT

MOVE INTO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. ABANDON MOBILE HOMES AND VEHICLES.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE AT 1-800-269-6220.

LAT...LON 4105 10499 4099 10495 4102 10470 4109 10471

$$

SOWKO

2 follow-up statements

000 
WWUS55 KCYS 282304
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
503 PM MDT THU JUN 28 2007

WYC021-282330-
/O.CON.KCYS.TO.W.0006.000000T0000Z-070628T2330Z/
LARAMIE WY-
503 PM MDT THU JUN 28 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR SOUTH
CENTRAL LARAMIE COUNTY...

AT 454 PM MDT...SEVERAL TRAINED WEATHER SPOTTERS REPORTED A FUNNEL 
CLOUD OCCASIONALLY TOUCHING DOWN AS A TORNADO.  THIS TORNADO WAS 
LOCATED OVER EXTREME SOUTH CENTRAL LARAMIE COUNTY...OR ABOUT 10 
MILES SOUTHWEST OF CHEYENNE...MOVING EAST AT 5 MPH.  THIS IS EAST OF 
I-25.  GOLF BALL SIZED HAIL IS ALSO OCCURRING WITH THIS STORM.  

THE TORNADO WILL BE NEAR...
  RURAL SOUTHERN LARAMIE COUNTY AT 520 PM MDT

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE AT 1-800-269-6220.

LAT...LON 4105 10499 4099 10495 4102 10470 4109 10471

$$

SOWKO

000 
WWUS55 KCYS 282330
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
528 PM MDT THU JUN 28 2007

WYC021-282338-
/O.EXP.KCYS.TO.W.0006.000000T0000Z-070628T2330Z/
LARAMIE WY-
528 PM MDT THU JUN 28 2007

...THE TORNADO WARNING FOR SOUTH CENTRAL LARAMIE COUNTY EXPIRES AT
530 PM MDT...

TORNADO REPORTS HAVE CEASED...HOWEVER THE THUNDERSTORM IS STILL 
SEVERE AND WILL CONTAIN LARGE HAIL.  A SEVERE THUNDERSTORM WARNING 
HAS BEEN ISSUED FOR THE SAME STORM.  THE TORNADO WARNING WILL BE 
ALLOWED TO EXPIRE.

REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE AT 1-800-269-6220.

LAT...LON 4105 10499 4099 10495 4102 10470 4109 10471

$$

SOWKO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 4:02 PM MDT	Severe Thunderstorm Warning	CYS	Albany	43 min
Jun 28, 4:44 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	61 min
Jun 28, 5:27 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	63 min

Nearby

Tornado Warnings in Wyoming, 2007 Every tornado warning in 2007 Tornadoes in 2007

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.