Alert archive / Wyoming / Tornado Warnings in 2009

Tornado Warning 3, NWS Cheyenne, WY

June 5, 2009Goshen County, Platte County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jun 5, 2009, 3:27 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 33 min. 3 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, 3:27 PM MDT (21:27 UTC)
Expired: Jun 5, 2009, 4:00 PM MDT
In force: 33 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

Counties Goshen County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 67 km from the middle of the area, began a volume at 21:30 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, 3:32 PM MDT	HAIL 0.5	14 W Hawk Springs, WY
Jun 5, 3:47 PM MDT	HAIL 1.75	7 E Chugwater, WY	HAIL VARIED IN SIZE FROM GOLFBALL TO MARBLE.
Jun 5, 4:10 PM MDT	HAIL 4.25	15 Nw La Grange, WY	SOME HAIL AS LARGE AS 4.5 INCHES.

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, 9.5 hours before the alert went out and 237 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 052127
TORCYS
WYC015-031-052200-
/O.NEW.KCYS.TO.W.0003.090605T2127Z-090605T2200Z/

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

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL GOSHEN COUNTY IN SOUTHEAST WYOMING...
  SOUTHEASTERN PLATTE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 400 PM MDT

* AT 326 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 7 MILES EAST OF CHUGWATER...OR 25 MILES SOUTHEAST
  OF WHEATLAND...AND MOVING EAST AT 15 MPH.

* THIS TORNADIC STORM WILL AFFECT MAINLY RURAL AREAS OF SOUTH CENTRAL
  GOSHEN AND SOUTHEASTERN PLATTE COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR

&&

LAT...LON 4176 10473 4186 10434 4164 10431 4167 10473
      4172 10474
TIME...MOT...LOC 2127Z 260DEG 14KT 4175 10468

$$

1 follow-up statement

000 
WWUS55 KCYS 052141
SVSCYS

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

WYC015-031-052200-
/O.CON.KCYS.TO.W.0003.000000T0000Z-090605T2200Z/
GOSHEN WY-PLATTE WY-
341 PM MDT FRI JUN 5 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM MDT FOR EXTREME
SOUTHEASTERN PLATTE AND SOUTHERN GOSHEN COUNTIES...

AT 340 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. 
THIS DANGEROUS STORM WAS LOCATED OVER SOUTHWESTERN GOSHEN
COUNTY...OR 31 MILES SOUTHEAST OF WHEATLAND...MOVING EAST AT 25 MPH.

LAT...LON 4167 10467 4173 10469 4178 10466 4186 10434
      4164 10431
TIME...MOT...LOC 2140Z 282DEG 22KT 4170 10456

$$

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, 3:49 PM MDT	Tornado Warning	CYS	Goshen	26 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.