Alert archive / Wyoming / Tornado Warnings in 2011

Tornado Warning 18, NWS Cheyenne, WY

July 2, 2011Goshen County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jul 2, 2011, 6:22 PM MDT for Goshen County, Wyoming. It was in force for 37 min. 1 report 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
Jul 2, 2011, 6:22 PM MDT (00:22 UTC)
Expired
Jul 2, 2011, 6:59 PM MDT
In force
37 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon

County Goshen County, WY

The radar

The Cheyenne radar (KCYS), 136 km from the middle of the area, began a volume at 00:23 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

TimeReportWhereRemark
Jul 2, 6:47 PM MDTTORNADO7 Ne Fort Laramie, 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.

IssuedProductOfficeLasted
Jul 2, 2:13 PM MDTTornado WatchSPC8 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.4 hours before the alert went out and 228 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, Rapid City, SD at 00:00Z on 2011-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1797 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2011-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
1797 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1368 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
223 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

920 
WFUS55 KCYS 030022
TORCYS
WYC015-030115-
/O.NEW.KCYS.TO.W.0018.110703T0022Z-110703T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
622 PM MDT SAT JUL 2 2011

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

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

* UNTIL 715 PM MDT

* AT 619 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 10 MILES SOUTHWEST OF JAY EM...OR 25 MILES SOUTH
  OF LUSK...AND MOVING SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HWY 85 AT DRY RAWHIDE CREEK.

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.

&&

LAT...LON 4233 10412 4213 10433 4238 10464 4246 10456
TIME...MOT...LOC 0023Z 303DEG 17KT 4239 10451

$$

MAZUR
2 follow-up statements
207 
WWUS55 KCYS 030036
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
636 PM MDT SAT JUL 2 2011

WYC015-030115-
/O.CON.KCYS.TO.W.0018.000000T0000Z-110703T0115Z/
GOSHEN WY-
636 PM MDT SAT JUL 2 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN GOSHEN COUNTY
UNTIL 715 PM MDT...

AT 632 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD.  A
TORNADO MAY DEVELOP AT ANY TIME. THIS DANGEROUS STORM WAS LOCATED 6
MILES NORTH OF FORT LARAMIE...OR 22 MILES NORTHWEST OF TORRINGTON...
MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  HWY 85 AT DRY RAWHIDE CREEK.

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.

&&

LAT...LON 4237 10449 4228 10418 4213 10433 4231 10455
TIME...MOT...LOC 0036Z 314DEG 26KT 4228 10446

$$

MAZUR
567 
WWUS55 KCYS 030059
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
659 PM MDT SAT JUL 2 2011

WYC015-030108-
/O.CAN.KCYS.TO.W.0018.000000T0000Z-110703T0115Z/
GOSHEN WY-
659 PM MDT SAT JUL 2 2011

...THE TORNADO WARNING FOR NORTHERN GOSHEN COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED INTO EAST CENTRAL 
GOSHEN COUNTY.

REMEMBER...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL 
GOSHEN COUNTY UNTIL 745 PM.

LAT...LON 4237 10449 4228 10418 4213 10433 4231 10455
TIME...MOT...LOC 0058Z 314DEG 26KT 4217 10431

$$

MAZUR

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 6:04 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte41 min
Jul 2, 6:44 PM MDTSevere Thunderstorm WarningCYSGoshen61 min
Jul 2, 6:56 PM MDTTornado WarningCYSGoshen49 min
Jul 2, 7:23 PM MDTTornado WarningCYSGoshen37 min
Jul 2, 7:54 PM MDTTornado WarningCYSGoshen40 min
Jul 2, 8:25 PM MDTFlash Flood WarningCYSGoshen6 hr
Jul 2, 8:30 PM MDTTornado WarningCYSGoshen45 min
Jul 3, 1:55 AM MDTAreal Flood WarningCYSGoshen7 hr

Nearby

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