Alert archive / Wyoming / Tornado Warnings in 2011

Tornado Warning 33, NWS Cheyenne, WY

August 9, 2011Goshen County, Laramie County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Aug 9, 2011, 7:18 PM MDT for Goshen County, Laramie County, Wyoming. It was in force for 42 min. 5 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: Aug 9, 2011, 7:18 PM MDT (01:18 UTC)
Expired: Aug 9, 2011, 8:00 PM MDT
In force: 42 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

Counties Goshen County, WY, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 84 km from the middle of the area, began a volume at 01:20 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
Aug 9, 7:24 PM MDT	HAIL 1	5 W Yoder, WY
Aug 9, 7:31 PM MDT	HAIL 1.75	Yoder, WY
Aug 9, 7:35 PM MDT	HAIL 2	Hawk Springs, WY
Aug 9, 7:44 PM MDT	HAIL 0.75	Hawk Springs, WY
Aug 9, 7:48 PM MDT	HAIL 1	6 N La Grange, WY

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
Aug 9, 1:51 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.3 hours before the alert went out and 229 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 5160 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -2 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.

382 
WFUS55 KCYS 100118
TORCYS
WYC015-021-100200-
/O.NEW.KCYS.TO.W.0033.110810T0118Z-110810T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
718 PM MDT TUE AUG 9 2011

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN GOSHEN COUNTY IN SOUTHEAST WYOMING...
  NORTHEASTERN LARAMIE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 800 PM MDT

* AT 715 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES WEST OF VETERAN...OR 17 MILES SOUTHWEST
  OF TORRINGTON...AND MOVING SOUTHEAST AT 50 MPH.

* THIS DANGEROUS STORM WILL BE NEAR...
  YODER AROUND 725 PM MDT.
  HAWK SPRINGS AROUND 730 PM MDT.
  HAWK SPRINGS RECREATION AREA AROUND 740 PM MDT.
  LA GRANGE AROUND 745 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

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

&&

LAT...LON 4181 10405 4153 10406 4156 10440 4191 10455
      4204 10439
TIME...MOT...LOC 0118Z 313DEG 46KT 4191 10442

$$

RUBIN

2 follow-up statements

859 
WWUS55 KCYS 100132
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
732 PM MDT TUE AUG 9 2011

WYC015-021-100200-
/O.CON.KCYS.TO.W.0033.000000T0000Z-110810T0200Z/
GOSHEN WY-LARAMIE WY-
732 PM MDT TUE AUG 9 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN LARAMIE AND
SOUTHERN GOSHEN COUNTIES UNTIL 800 PM MDT...

AT 729 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR HAWK SPRINGS...OR 18 MILES SOUTH OF
TORRINGTON...MOVING SOUTHEAST AT 55 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  HAWK SPRINGS RECREATION AREA AROUND 740 PM MDT.
  LA GRANGE AROUND 745 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST
RESORT... EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR
VEHICLE AND LIE DOWN IN A LOW LYING AREA.

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

&&

LAT...LON 4197 10429 4181 10405 4153 10406 4156 10440
      4183 10452
TIME...MOT...LOC 0132Z 313DEG 46KT 4180 10426

$$

RUBIN

884 
WWUS55 KCYS 100159
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
759 PM MDT TUE AUG 9 2011

WYC015-021-100208-
/O.EXP.KCYS.TO.W.0033.000000T0000Z-110810T0200Z/
GOSHEN WY-LARAMIE WY-
759 PM MDT TUE AUG 9 2011

...THE TORNADO WARNING FOR NORTHEASTERN LARAMIE AND SOUTHERN GOSHEN
COUNTIES WILL EXPIRE AT 800 PM MDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. 

A SEVERE THUNDERSTORM WARNING IS IN EFFECT UNTIL 900 PM MDT FOR 
BANNER COUNTY...NORTHWESTERN KIMBALL COUNTY...SOUTHWESTERN SCOTTS 
BLUFF COUNTY...SOUTHEASTERN GOSHEN COUNTY AND EAST CENTRAL LARAMIE 
COUNTY. 

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 900 PM MDT.

LAT...LON 4197 10429 4181 10405 4153 10406 4156 10440
      4183 10452
TIME...MOT...LOC 0158Z 313DEG 46KT 4157 10393

$$

RUBIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 6:11 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	49 min
Aug 9, 6:54 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	66 min
Aug 9, 7:54 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	66 min
Aug 9, 8:57 PM MDT	Special Weather Statement	CYS	Goshen	48 min
Aug 9, 8:59 PM MDT	Special Weather Statement	CYS	Goshen	46 min
Aug 9, 9:11 PM MDT	Special Weather Statement	CYS	Laramie	64 min
Aug 9, 9:31 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	59 min
Aug 10, 1:25 AM MDT	Dense Fog Advisory	CYS	Albany, Laramie	5 hr
Aug 10, 2:16 PM MDT	Fire Weather Watch	CYS		13 hr
Aug 10, 3:19 PM MDT	Special Weather Statement	CYS	Laramie	56 min
Aug 10, 3:31 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	48 min
Aug 10, 3:38 PM MDT	Tornado Warning	CYS	Laramie	37 min
Aug 10, 4:33 PM MDT	Special Weather Statement	CYS	Laramie	57 min
Aug 10, 5:46 PM MDT	Special Weather Statement	CYS	Laramie	59 min

Nearby

Tornado Warnings in Wyoming, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.