Alert archive / Wyoming / Special Weather Statements in 2017

Special Weather Statement, NWS Riverton, WY

June 28, 2017Big Horn County, Washakie County, Wyoming

NWS Riverton, WY issued this special weather statement at Jun 28, 2017, 2:01 PM MDT for Big Horn County, Washakie County, Wyoming. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 28, 2017, 2:01 PM MDT (20:01 UTC)
Expired: Jun 28, 2017, 2:30 PM MDT
In force: 29 min
Issued by: NWS Riverton, WY

Counties Big Horn County, WY, Washakie County, WY

The radar

The Billings radar (KBLX), 147 km from the middle of the area, began a volume at 20:01 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.

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 8.0 hours before the alert went out and 380 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: 2455 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Jun 28, 1:25 PM MDT, 36 minutes earlier.

Area forecast discussion, Jun 28, 1:25 PM MDT, 36 minutes before

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Hazardous weather outlook, Jun 28, 2:23 AM MDT, 11 hours 38 minutes before

Hazardous Weather Outlook
National Weather Service Riverton WY
223 AM MDT Wed Jun 28 2017

WYZ001>020-022>030-291100-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
223 AM MDT Wed Jun 28 2017

...A flood warning remains in effect for a portion of the Green
River in southwestern Wyoming...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Isolated (south and central Wyoming) to scattered thunderstorms
across northern Wyoming. A few storms may be strong to locally severe
across northern Wyoming producing brief heavy rain, wind gusts of
50 to 60 mph and hail to one inch this afternoon and evening.

Minor flooding will continue along the Green River near La Barge
and along the Big Horn River. Please see flood warning for the
Green River for the latest information.

Additionally, warm, dry and breezy to windy conditions will bring
elevated fire danger to portions of southern Wyoming.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thursday...Isolated to widely scattered thunderstorms mainly
across northern and central Wyoming. Some storms may be strong,
producing wind gusts of 40 to 50 mph and small hail in the
afternoon and evening.

Saturday and Sunday...Isolated to widely scattered thunderstorms
across north and central Wyoming.

.SPOTTER INFORMATION STATEMENT...Please report wind damage or
gusts in excess of 50 mph and hail of penny size or larger.

In the hours before

Special weather statement, Jun 28, 1:02 PM MDT, 59 minutes before

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Special weather statement, Jun 28, 1:07 PM MDT, 54 minutes before

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Special weather statement, Jun 28, 1:35 PM MDT, 26 minutes before

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Special weather statement, Jun 28, 1:38 PM MDT, 23 minutes before

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Special weather statement, Jun 28, 1:56 PM MDT, 5 minutes before

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Special weather statement, Jun 28, 2:01 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Riverton WY
201 PM MDT WED JUN 28 2017

WYZ004>006-008-282030-
North Big Horn Basin-Southeast Big Horn Basin-Southwest Big Horn
Basin-Bighorn Mountains West-
201 PM MDT WED JUN 28 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL HOT SPRINGS...
CENTRAL BIG HORN AND NORTH CENTRAL WASHAKIE COUNTIES UNTIL 230 PM
MDT...

At 200 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Bighorn Lake to Lucerne. Movement was east
at 45 mph.

Half inch hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Strong thunderstorms will be near...
  Worland and Greybull around 210 PM MDT.

Other locations impacted by these storms include, Medicine Wheel
Archeological Area, Big Horn County Fairgrounds, Greybull South Big
Horn County Airport, Big Horn County Library Greybull Branch, Ranger
Creek Campground, Greybull Public Schools, Shell Creek Campground,
Worland Washakie Medical Center and Worland High School.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If on or near area lakes and streams, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.

Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.

&&

LAT...LON 4498 10788 4493 10788 4490 10785 4487 10786
      4482 10782 4479 10783 4477 10775 4472 10775
      4471 10768 4468 10767 4469 10759 4466 10752
      4463 10752 4464 10750 4461 10747 4460 10740
      4367 10746 4366 10819 4496 10812 4500 10791
TIME...MOT...LOC 2000Z 261DEG 41KT 4489 10812 4374 10819

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 12:15 PM MDT	Special Weather Statement	RIW		45 min
Jun 28, 1:02 PM MDT	Special Weather Statement	RIW	Sublette	28 min
Jun 28, 1:07 PM MDT	Special Weather Statement	RIW	Hot Springs	23 min
Jun 28, 1:35 PM MDT	Special Weather Statement	RIW	Fremont	25 min
Jun 28, 1:38 PM MDT	Special Weather Statement	RIW	Big Horn	22 min
Jun 28, 1:56 PM MDT	Special Weather Statement	RIW	Fremont	34 min
Jun 28, 2:22 PM MDT	Special Weather Statement	RIW	Big Horn, Washakie	23 min
Jun 28, 2:25 PM MDT	Special Weather Statement	RIW	Fremont	35 min
Jun 28, 2:48 PM MDT	Special Weather Statement	RIW	Washakie	27 min
Jun 28, 2:50 PM MDT	Special Weather Statement	RIW		40 min
Jun 28, 3:23 PM MDT	Special Weather Statement	RIW	Natrona	22 min
Jun 28, 3:30 PM MDT	Special Weather Statement	RIW	Lincoln, Sublette	90 min
Jun 28, 3:43 PM MDT	Special Weather Statement	RIW	Teton	47 min
Jun 28, 3:52 PM MDT	Special Weather Statement	RIW	Natrona	23 min
Jun 28, 4:08 PM MDT	Special Weather Statement	RIW	Johnson	22 min
Jun 28, 4:19 PM MDT	Special Weather Statement	RIW		26 min
Jun 28, 4:23 PM MDT	Special Weather Statement	RIW	Natrona	37 min
Jun 28, 4:26 PM MDT	Special Weather Statement	RIW	Teton	49 min
Jun 28, 4:39 PM MDT	Special Weather Statement	RIW	Johnson	36 min
Jun 28, 4:45 PM MDT	Special Weather Statement	RIW		45 min
Jun 28, 5:04 PM MDT	Special Weather Statement	RIW	Johnson	56 min
Jun 28, 5:08 PM MDT	Special Weather Statement	RIW	Big Horn	67 min
Jun 28, 5:36 PM MDT	Special Weather Statement	RIW	Big Horn	39 min
Jun 28, 5:41 PM MDT	Special Weather Statement	RIW	Big Horn	49 min

Nearby

Special Weather Statements in Wyoming, 2017 Every special weather statement in 2017

Sources

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