Alert archive / Wyoming / High Wind Watches in 2015

High Wind Watch 21, NWS Riverton, WY

December 16, 2015Park County, Wyoming

NWS Riverton, WY issued this high wind watch at Dec 16, 2015, 1:55 PM MST for Park County, Wyoming. It took effect at Dec 17, 2015, 5:00 PM MST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 16, 2015, 1:55 PM MST (20:55 UTC)
In effect from: Dec 17, 2015, 5:00 PM MST
Expired: Dec 17, 2015, 2:04 AM MST
In force
Issued by: NWS Riverton, WY

County Park County, WY

The radar

The Billings radar (KBLX), 167 km from the middle of the area, began a volume at 20:58 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

Riverton, WY (KRIW), launched 12:00Z, 8.9 hours before the alert went out and 187 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: 1208 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 60 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.

600 
WWUS75 KRIW 162055
NPWRIW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
155 PM MST WED DEC 16 2015

...VERY STRONG WINDS POSSIBLE IN THE CODY FOOTHILLS THURSDAY NIGHT...

.VERY COLD AIR OVER THE YELLOWSTONE PLATEAU COMBINED WITH AN
INCREASE SURFACE PRESSURE GRADIENT ACROSS THE AREA MAY ALLOW VERY
STRONG WINDS TO BLOW OUT OF THE CANYONS ALONG THE CODY FOOTHILLS
THURSDAY NIGHT THROUGH ABOUT SUNRISE FRIDAY.

WYZ003-170900-
/O.NEW.KRIW.HW.A.0021.151218T0000Z-151218T1500Z/
CODY FOOTHILLS-
INCLUDING THE CITIES OF...CODY...MEETEETSE
155 PM MST WED DEC 16 2015

...HIGH WIND WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH
FRIDAY MORNING...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A HIGH WIND
WATCH...WHICH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY
MORNING. 

* TIMING...WINDS WILL INCREASE RAPIDLY THURSDAY EVENING AND PEAK
  LATE THURSDAY NIGHT.

* WINDS...WEST 30 TO 40 MPH WITH GUSTS AROUND 60 MPH. STRONGER
  WIND GUSTS ARE POSSIBLE ALONG CANYON ROAD WEST OF CLARK.

* IMPACTS...THESE STRONG CROSSWINDS COULD SIGNIFICANTLY IMPACT
  TRAVELLERS ALONG HIGHWAY 120 FROM JUST SOUTH OF CODY TO THE
  CLARK AREA. THE MOST PROBABLE AREA FOR THESE HIGH WINDS WILL BE
  NEAR AND JUST SOUTH OF CLARK AND POSSIBLY JUST SOUTH OF CODY
  ALONG HIGHWAY 120 AND SOUTH OF U.S. HIGHWAY 14. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS
HIGH WIND EVENT. SUSTAINED WINDS OF AT LEAST 40 MPH...OR GUSTS OF
58 MPH OR STRONGER MAY OCCUR. CONTINUE TO MONITOR THE LATEST
FORECASTS.

&&

$$

SKRBAC

1 follow-up statement

905 
WWUS75 KRIW 170904
NPWRIW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
204 AM MST THU DEC 17 2015

...VERY STRONG WINDS IN THE CODY FOOTHILLS TONIGHT...

.VERY COLD AIR OVER THE YELLOWSTONE PLATEAU COMBINED WITH AN
INCREASE SURFACE PRESSURE GRADIENT ACROSS THE AREA SHOULD
ENCOURAGE VERY STRONG WINDS TO BLOW OUT OF THE CANYONS ALONG THE
CODY FOOTHILLS TONIGHT THROUGH ABOUT SUNRISE FRIDAY.

WYZ003-172300-
/O.UPG.KRIW.HW.A.0021.151218T0000Z-151218T1500Z/
/O.NEW.KRIW.HW.W.0019.151218T0000Z-151218T1500Z/
CODY FOOTHILLS-
INCLUDING THE CITIES OF...CODY...MEETEETSE
204 AM MST THU DEC 17 2015

...HIGH WIND WARNING IN EFFECT FROM 5 PM TODAY TO 8 AM MST
FRIDAY...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A HIGH WIND
WARNING...WHICH IS IN EFFECT FROM 5 PM TODAY TO 8 AM MST FRIDAY.
THE HIGH WIND WATCH IS NO LONGER IN EFFECT.

* TIMING...WINDS WILL INCREASE RAPIDLY THIS EVENING AND PEAK LATE
  TONIGHT INTO EARLY FRIDAY MORNING.

* WINDS...WEST 30 TO 40 MPH WITH GUSTS AROUND 60 MPH. STRONGER 
  WIND GUSTS ARE POSSIBLE ALONG CANYON ROAD WEST OF CLARK. 

* IMPACTS...THESE STRONG CROSSWINDS COULD SIGNIFICANTLY IMPACT
  TRAVELERS ALONG HIGHWAY 120 FROM JUST SOUTH OF CODY TO THE
  CLARK AREA. THE MOST PROBABLE AREA FOR THESE HIGH WINDS WILL BE
  NEAR AND JUST SOUTH OF CLARK AND POSSIBLY JUST SOUTH OF CODY
  ALONG HIGHWAY 120 AND SOUTH OF U.S. HIGHWAY 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE.

&&

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 16, 1:19 PM MST	Winter Weather Advisory	RIW	Fremont, Lincoln	8 hr

Nearby

High Wind Watches in Wyoming, 2015 Every high wind watch in 2015

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.