Winter Storm Watch 21, NWS Riverton, WY

690 
WWUS45 KRIW 222034
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
234 PM MDT Fri Sep 22 2017

...Significant Snowfall over Portions of the Western Mountains
Through This Evening...

.After more snow overnight, another bout of significant snowfall
is expected to impact the Wind River Mountains and Absaroka
Mountains through this evening. Snowfall will linger in from the
Tetons and Yellowstone into this afternoon at times but the next
heavier bout is expected a little further east into the Wind
River and Absaroka mountains.

WYZ012-222145-
/O.EXP.KRIW.WW.Y.0033.000000T0000Z-170922T2100Z/
Teton and Gros Ventre Mountains-
234 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 3 PM MDT THIS
AFTERNOON...

Only scattered snow showers are expected the remainder of today
and tonight, so the winter weather advisory will be allowed to
expire at 3 pm. 

$$

WYZ014-015-230015-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0300Z/
/O.CON.KRIW.WS.A.0021.170924T0000Z-170925T0000Z/
Wind River Mountains West-Wind River Mountains East-
234 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...WINTER STORM WATCH REMAINS IN EFFECT FROM SATURDAY EVENING
THROUGH SUNDAY AFTERNOON...

* TIMING...Another round of snow, possibly heavy at times, is 
  expected later this afternoon and evening. This same storm 
  system is then expected to bring another period of heavy snow 
  Saturday night and Sunday. Some lighter snow will likely 
  continue through Sunday night. 

* TOTAL SNOWFALL...4 to 8 inches so far.

* NEW SNOWFALL THROUGH THIS EVENING...3 to 6 inches with locally 
  higher amounts above 9500 feet. South Pass will likely only 
  see two inches or less. 

* NEW SNOWFALL FOR SATURDAY NIGHT AND SUNDAY...8 TO 16 INCHES 
  POSSIBLE. 

* MAIN IMPACT...Togwotee Pass will become snow covered again. 
  Backcountry travellers and hunters should be prepared for a 
  round of heavy wet snow and snow covered roads, especially 
  over Union Pass. South Pass may become briefly snow covered 
  during heavier snow showers. The next bout of snow Saturday 
  night and Sunday will bring widespread snow covered and slick 
  roads with reduced visibility. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions before venturing out.

A winter storm watch means there is a potential for significant
snow and/or blowing snow that may impact travel. Continue to
monitor the latest forecasts.

&&

$$

WYZ001-230000-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0000Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
234 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* TIMING...Periods of snow will impact much of Yellowstone 
  National Park through this afternoon. The lowest elevations 
  could be mixture of rain and snow at times. 

* NEW SNOWFALL...1 to 3 inches in the mountains with very little 
  elsewhere. 

* MAIN IMPACT...Backcountry travellers will need to be prepared 
  for cold and wet conditions. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions before venturing out.

&&

$$

WYZ002-230015-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0600Z/
Absaroka Mountains-
234 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT...

* TIMING...Periods of snow will impact the Absaroka Mountains 
  through midnight tonight. Another bout of significant snow is 
  expected Saturday night and Sunday, especially across the 
  south end of the Absaroka range. 

* TOTAL SNOWFALL...10 to 17 inches above 9000 feet with 2 to 8 
  inches below 9000 feet. 

* NEW SNOWFALL THROUGH THIS EVENING...3 to 8 inches above 9000 
  feet with 1 to 3 inches below 9000 feet. 

* NEW SNOWFALL SATURDAY NIGHT AND SUNDAY...4 TO 8 inches with up 
  to a foot on the southern part of the Absaroka range. 

* MAIN IMPACT...Chief Joseph Highway will become slick once 
  again after some brief melting around midday. Backcountry 
  travellers and hunters should be prepared for another round of 
  heavy wet snow later this afternoon and evening. More 
  widespread slick and snow covered roads will occur Saturday 
  night and Sunday. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

811 
WWUS45 KRIW 230007
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
607 PM MDT Fri Sep 22 2017

...Significant Snowfall over Portions of the Western Mountains
Through This Evening...

.After more snow overnight, another bout of significant snowfall
is expected to impact the Wind River Mountains and Absaroka
Mountains through this evening. Snowfall will linger in from the
Tetons and Yellowstone into this afternoon at times but the next
heavier bout is expected a little further east into the Wind
River and Absaroka mountains.

WYZ001-230115-
/O.EXP.KRIW.WW.Y.0033.000000T0000Z-170923T0000Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
607 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY EXPIRED AT 6 PM MDT THIS EVENING...

Light snow showers may continue off-and-on across Yellowstone
National Park through 9 PM MDT this evening, but new accumulations
will be less than one inch. Therefore, the winter weather advisory
has been allowed to expire.

$$

WYZ014-015-231200-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0300Z/
/O.CON.KRIW.WS.A.0021.170924T0000Z-170925T0000Z/
Wind River Mountains West-Wind River Mountains East-
607 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...WINTER STORM WATCH REMAINS IN EFFECT FROM SATURDAY EVENING
THROUGH SUNDAY AFTERNOON...

* TIMING...Another round of snow, possibly heavy at times, is
  expected through Friday evening. This same storm system is then
  expected to bring another period of heavy snow Saturday night
  and Sunday. Some lighter snow will likely continue through
  Sunday night.

* TOTAL SNOWFALL...4 to 8 inches so far.

* NEW SNOWFALL THROUGH THIS EVENING...3 to 6 inches with locally 
  higher amounts above 9500 feet. South Pass will likely only 
  see two inches or less. 

* NEW SNOWFALL FOR SATURDAY NIGHT AND SUNDAY...8 TO 16 INCHES
  POSSIBLE.

* MAIN IMPACT...Togwotee Pass will become snow covered again. 
  Backcountry travellers and hunters should be prepared for a 
  round of heavy wet snow and snow covered roads, especially 
  over Union Pass. South Pass may become briefly snow covered 
  during heavier snow showers. The next bout of snow Saturday 
  night and Sunday will bring widespread snow covered and slick 
  roads with reduced visibility. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions before venturing out.

A winter storm watch means there is a potential for significant
snow and/or blowing snow that may impact travel. Continue to
monitor the latest forecasts.

&&

$$

WYZ002-230600-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0600Z/
Absaroka Mountains-
607 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT...

* TIMING...Periods of snow will impact the Absaroka Mountains
  through midnight tonight. Another bout of significant snow is
  expected Saturday night and Sunday, especially across the south
  end of the Absaroka Range. 

* TOTAL SNOWFALL...10 to 17 inches above 9000 feet with 2 to 8 
  inches below 9000 feet. 

* NEW SNOWFALL THROUGH THIS EVENING...3 to 8 inches above 9000 
  feet with 1 to 3 inches below 9000 feet. 

* NEW SNOWFALL SATURDAY NIGHT AND SUNDAY...4 TO 8 inches with up
  to a foot on the southern part of the Absaroka Range. 

* MAIN IMPACT...Chief Joseph Highway will become slick again after
  brief melting earlier Friday. Backcountry travellers and 
  hunters should be prepared for another round of heavy wet snow 
  later this afternoon and evening. More widespread slick and snow
  covered roads will occur Saturday night and Sunday. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

513 
WWUS45 KRIW 230257
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
857 PM MDT Fri Sep 22 2017

...Significant Snowfall over Portions of the Western Mountains
Through This Evening...

.The last batch of heavy moisture will sweep north across the
Absaroka Range late Friday evening. Areas to the south will see
very limited snowfall through the remainder of the night.

WYZ014-015-231200-
/O.EXP.KRIW.WW.Y.0033.000000T0000Z-170923T0300Z/
/O.CON.KRIW.WS.A.0021.170924T0000Z-170925T0000Z/
Wind River Mountains West-Wind River Mountains East-
857 PM MDT Fri Sep 22 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM SATURDAY EVENING
THROUGH SUNDAY AFTERNOON...
...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING...

* TIMING...Very light snow will continue through Friday evening,
  but little additional accumulation is anticipated. However,
  another period of heavy snow is possible Saturday night and
  Sunday before slowing again through Sunday night. 

* TOTAL SNOWFALL...4 to 8 inches so far.

* NEW SNOWFALL FOR SATURDAY NIGHT AND SUNDAY...8 TO 16 inches
  possible.
 
* MAIN IMPACT...Togwotee Pass will become snow covered again. 
  Backcountry travellers and hunters should be prepared for a 
  round of heavy wet snow and snow covered roads, especially 
  over Union Pass. South Pass may become briefly snow covered 
  during heavier snow showers. The next bout of snow Saturday 
  night and Sunday will bring widespread snow covered and slick 
  roads with reduced visibility. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions before venturing out.

A winter storm watch means there is a potential for significant
snow and/or blowing snow that may impact travel. Continue to
monitor the latest forecasts.

&&

$$

WYZ002-230600-
/O.CON.KRIW.WW.Y.0033.000000T0000Z-170923T0600Z/
Absaroka Mountains-
857 PM MDT Fri Sep 22 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT...

* TIMING...Another swath of snow will continue to spread north
  across the Absaroka Range through midnight. Another bout of 
  significant snow is expected Saturday night and Sunday, 
  especially across the south end of the Absaroka Range. 

* TOTAL SNOWFALL...10 to 17 inches above 9000 feet with 2 to 8 
  inches below 9000 feet. 

* NEW SNOWFALL THROUGH THIS EVENING...3 to 8 inches above 9000 
  feet with 1 to 3 inches below 9000 feet. 

* NEW SNOWFALL SATURDAY NIGHT AND SUNDAY...4 TO 8 inches with up 
  to a foot on the southern part of the Absaroka Range. 

* MAIN IMPACT...Chief Joseph Highway will become slick again 
  after brief melting earlier Friday. Backcountry travellers and 
  hunters should be prepared for another round of heavy wet snow 
  later this afternoon and evening. More widespread slick and 
  snow covered roads will occur Saturday night and Sunday. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

155 
WWUS45 KRIW 230700
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
100 AM MDT Sat Sep 23 2017

...Significant Snowfall Possible Over Portions of the Wind River 
Mountains Tonight Through Sunday...

.Precipitation shifts eastward today through Sunday as moisture 
returns to the area from the south and east tonight. Periods of 
moderate to occasionally heavy snow will be possible above 8000 
feet and light snow or rain mixing with snow below this elevation.


WYZ014-015-232200-
/O.CON.KRIW.WS.A.0021.170924T0000Z-170925T0000Z/
Wind River Mountains West-Wind River Mountains East-
100 AM MDT Sat Sep 23 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH
SUNDAY AFTERNOON...

* TIMING...Light snow will continue this morning with little
  additional accumulation anticipated. However, another period of
  heavy snow is possible later tonight and Sunday before slowing 
  again through Sunday night. 

* TOTAL SNOWFALL...2 to 8 inches so far.

* NEW SNOWFALL FOR SATURDAY NIGHT AND SUNDAY...4 TO 16 inches
  possible with heaviest accumulations above 9000 feet. 

* MAIN IMPACT...Togwotee Pass will become snow covered again.
  Backcountry travellers and hunters should be prepared for a
  round of heavy wet snow and snow covered roads, especially over
  Union Pass. South Pass may become briefly snow covered during
  heavier snow showers. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter storm watch means there is a potential for significant 
snow and/or blowing snow that may impact travel. Continue to 
monitor the latest forecasts.

&&

$$

620 
WWUS45 KRIW 232017
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
217 PM MDT Sat Sep 23 2017

...Snowfall Over the Wind River and Bighorn Mountains Tonight 
Through Sunday...

.the western edge of a storm system will bring snow to the
Wind River and Bighorn mountains tonight through Sunday.
Snowfall will be heaviest above 7500 feet with accumulations of 5
to 10 inches possible. Below 7500 feet snow accumulation of 3 to 
6 inches is expected. 

WYZ014-015-241000-
/O.UPG.KRIW.WS.A.0021.170924T0000Z-170925T0000Z/
/O.NEW.KRIW.WW.Y.0034.170924T0000Z-170925T0000Z/
Wind River Mountains West-Wind River Mountains East-
217 PM MDT Sat Sep 23 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT SUNDAY...

The National Weather Service in Riverton has issued a Winter
Weather Advisory for snow, which is in effect from 6 PM this 
evening to 6 PM MDT Sunday. The Winter Storm Watch is no longer in
effect. 

* TIMING...Snowfall is expected to increase this evening and
  continue through Sunday tapering off in the late afternoon. 

* TOTAL SNOWFALL...5 to 10 inches.

* MAIN IMPACT...snowfall will make travel more difficult over
  the mountain passes.

* OTHER IMPACTS...Campers and Hunters should be prepared for
  cold and snowy weather. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

WYZ008-009-241000-
/O.NEW.KRIW.WW.Y.0034.170924T0000Z-170925T0000Z/
Bighorn Mountains West-Bighorn Mountains Southeast-
217 PM MDT Sat Sep 23 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
6 PM MDT SUNDAY...

The National Weather Service in Riverton has issued a Winter
Weather Advisory for snow, which is in effect from 6 PM this 
evening to 6 PM MDT Sunday. 

* TIMING...Snowfall is expected to increase this evening and
  continue through Sunday tapering off in the late afternoon. 

* TOTAL SNOWFALL...5 to 10 inches.

* MAIN IMPACT...snowfall will make travel more difficult over
  the mountain passes.

* OTHER IMPACTS...Campers and Hunters should be prepared for cold
  and snowy weather. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A winter weather advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest road
conditions at wyoroad.info or by dialing 5 1 1.

&&

$$

Area Forecast Discussion
National Weather Service Riverton WY
1204 PM MDT Fri Sep 22 2017

.SHORT TERM...(Today through Sunday night)
Issued at 250 AM MDT Fri Sep 22 2017

Imagery shows amplified trof over the wrn CONUS with embedded closed
low centered ovr ID. An amplifying/broadening high pressure ridge is
currently across the ern CONUS (with the exception of the embedded
TS JOSE still east of Long Island, NY). Strong upper jet loops
around the wrn upper trof with the the most intense section
located from srn California nosing over wrn WY. The exit region of
this embedded jet streak now translating ewd into/through wrn WY.
SFC has low pressure around most of the wrn CONUS with a cold
front draped from the nrn Plains through srn WY and then down into
and out of srn California. Widespread precipitation...both rain
and snow...stretches from nrn/cntrl UT through ern ID/wrn WY and
into cntrl MT.

Copious precipitation continues this morning in earnest west of the
Divide...just starting to move east of the Divide across ncntrl WY.
The hard part is determining/forecasting where it will rain/ mix/or
snow with such an elongated north/south orientation on the east side
of trof. Further displacement of the deep upper trof ewd this will
provide the impetus to shift precipitation and colder air more
fully eastward and eventually east of the Divide by this
afternoon. With precipitation intensifying again this morning
coinciding with the arrival of slightly colder air, expecting much
of the area across the west to turn to snow or rain/snow mix this
morning even in the valleys. Most significant accumulating
snowfall will, however, be confined to elevations above 7500 feet
west of the Divide with heaviest precipitation - both rain and
snow -occurring from now into mid morning before tapering off.
Heaviest precip and coldest air this morning will be located
across Teton and Park counties...which is where to expect heaviest
snow above 7500 feet. Advisories are currently in place for most
of the mountainous region over nwrn/cntrl WY into/through this
afternoon. Thunder will also be possible this afternoon across
Sweetwater and srn Fremont counties...coincident within the warm
sector along and south of the front.

Beyond this period, the upper high pressure ridge across the ern
CONUS continues to strengthen and expand while the upper trof over
the western CONUS slows/stalls and digs. The upper trof and
associated jet will spawn lee cyclogenesis across nern CO which in
turn will pull the front down to near the srn border region with
CO. All the while, the base/axis of the upper trof/closed low will
only translate as far east as WY (from the ID starting point)
through the forecast period. This will keep a nearly stationary
front draped backdoor style from the Front Range of Colorado
up/along the Divide through WY while another front/boundary
lays/stays across srn WY. Periodic bouts of precipitation will
also continue throughout the forecast period with rain/rain-snow
mixes and light snow all possible even east of the Divide across
the lower elevations from Saturday night through Sunday night.
From now through tonight...precipitation amounts from 0.3 inch to
as much as 1 inch of liquid will be common west of the Divide
with from a few hundredths to as much as a half inch possible east
of the Divide. From later tonight through the day
Saturday...heavier precip will shift east of the Divide...ranging
from a few hundredths to around a quarter of an inch for most
locations. Sunday through Sunday night, moisture return and both
low and upper level forcing will increase, bringing precip back
across the FA...especially ern/cntrl/and srn WY with precip
amounts ranging from less than a tenth across the north...to as
much as 0.5 - 1.0 inches over srn and cntrl WY. Unseasonably cold
throughout with little in the way of fire danger.

.LONG TERM...(Monday through Friday)
Issued at 250 AM MDT Fri Sep 22 2017

Unsettled weather continues Monday as the upper level low lifts
northeast through WY. Thus a chance of rain and mountain snow
over the area. High temps will remain cold due to the clouds and
precipitation. Tuesday looks drier over the region. The ECMWF
model keeps the area dry Tue and Tue night as it takes energy well
west of WY and forms a circulation over southern Nevada by Wed
morning. The GFS model wants to bring another weather system into
the region Tue afternoon through Tue night with scattered rain
and snow showers. Leaned toward the GFS model and will have low
chance of precipitation Tue afternoon through Tue night. High
temps still on the cool side Tue. On Wed, the GFS keeps isolated
showers around the area while the ECMWF model is dry. Left
isolated showers in the mountains for now for Wed into Wed
evening. A little milder Wed. Next Thurs and Fri appear dry and
warmer. The ECMWF model wants to bring a weather system through
next Fri and Fri night. This seems too fast and will not buy into
this scenario at the present time.

&&

.AVIATION...For the 18Z TAFS through 18Z Saturday afternoon
Issued at 1204 PM MDT Fri Sep 22 2017

The low pressure system continues to push eastward towards
Wyoming bringing continued rain to areas west of the divide until
03z-05z. Periods of MVFR and IFR conditions will be frequent
obscuring much of the terrain. These conditions will then improve
to VFR as the low finally moves east across Wyoming. KCOD will
continue to see IFR/MVFR through most of the forecast period. Best
chance of heavier precipitation at KCOD will come with the
eastward-moving band between 02Z-08Z/Sat. Other terminals will
have periods of MVFR as moisture in southwest flow aloft overruns
dome of cooler air in place east of the Divide. KRIW appears to be
the favored terminal in this setting. Northerly surface flow
around 10kts to remain in place Friday. Another northerly surge
will push south across the terminals between 00Z/Sat and 06Z/Sat
with 10-20kt winds anticipated. Best chance for mountain
obscurations will be along the east slopes of the Absaroka and
Bighorn ranges during the period. Mountain top obscurations will
be widespread throughout. Isolated thunderstorms are possible this
afternoon in Sweetwater and southern portions of Fremont counties.

&&

.FIRE WEATHER...
Issued AT 250 AM MDT Fri Sep 22 2017

Fuels at critical levels for most of the low elevation forecast
zones east of the Divide and across southern Wyoming. (Please see
the Fire Weather Forecast product for more information).

Today through the weekend will be cool/seasonally cold most of the
forecast area. Additionally, copious moisture/rainfall/mountain
snowfall will expand from the west across most of Wyoming
today...and continue through Monday. Significant precipitation
values can be expected in one form or another...with everyone having
a chance to get from a half inch to as much as an inch and a half of
liquid. While winds will periodically gust 20 to 30 mph at
time...high minimum relative humidity values and precipitation will
keep fire danger low.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until 6 PM MDT this evening for WYZ001-
002.

Winter Weather Advisory until noon MDT today for WYZ014-015.

Winter Weather Advisory until 3 PM MDT this afternoon for WYZ012.

&&

SHORT TERM...Braun
LONG TERM...AR
AVIATION...Hulme
FIRE WEATHER...Braun

Hazardous Weather Outlook
National Weather Service Riverton WY
301 AM MDT Fri Sep 22 2017

WYZ001>020-022>030-231115-
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-
301 AM MDT Fri Sep 22 2017

...Winter Weather Advisory in effect for the northwestern
mountains through Today...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and tonight

Significant mountain snowfall and valley rainfall across
northwestern Wyoming through today Please see the winter weather
statement for more details.

Rain may mix with or change to snow briefly in the Cody Foothills
this morning.

.DAYS TWO THROUGH SEVEN...Friday Night through Wednesday

Saturday through Monday...Widespread mountain snowfall and valley
rain at times especially along and east of the Divide. Snow could
mix with rain or lower to valley floors briefly at a few
locations east of the Divide.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report rain or snowfall amounts. Thank
you!

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE RIVERTON WY
0817 AM MDT FRI SEP 22 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0141 PM     SNOW             26 NW DUBOIS            43.81N 110.19W
09/21/2017  M5.00 INCHES     TETON              WY   PUBLIC

            TOGWOTEE PASS

0144 PM     SNOW             19 SW BONDURANT         42.96N 110.61W
09/21/2017  E5.00 INCHES     LINCOLN            WY   MESONET

            BLIND BULL SUMMIT SNOTEL

0707 AM     HEAVY SNOW       19 WSW WAPITI           44.38N 109.79W
09/22/2017  E17.00 INCHES    PARK               WY   MESONET

            BLACKWATER SNOTEL

0709 AM     HEAVY SNOW       21 W CLARK              44.94N 109.57W
09/22/2017  E12.00 INCHES    PARK               WY   MESONET

            BEARTOOTH LAKE SNOTEL

0710 AM     HEAVY SNOW       11 N DUBOIS             43.70N 109.67W
09/22/2017  E8.00 INCHES     FREMONT            WY   MESONET

            BURROUGHS CREEK SNOTEL

0711 AM     HEAVY SNOW       30 SW MEETEETSE         43.86N 109.32W
09/22/2017  E12.00 INCHES    PARK               WY   MESONET

            KIRWIN SNOTEL

0711 AM     HEAVY SNOW       56 SW CODY              43.93N 109.82W
09/22/2017  E11.00 INCHES    PARK               WY   MESONET

            YOUNTS PEAK SNOTEL

0746 AM     HEAVY SNOW       1 WSW CANYON            44.72N 110.51W
09/22/2017  E10.00 INCHES    YELLOWSTONE        WY   MESONET

            CANYON SNOTEL

0747 AM     HEAVY SNOW       5 N SOUTH ENTRANCE      44.21N 110.67W
09/22/2017  E6.00 INCHES     YELLOWSTONE        WY   MESONET

            LEWIS LAKE DIVIDE SNOTEL

0748 AM     HEAVY SNOW       16 N PAHASKA            44.73N 109.91W
09/22/2017  E20.00 INCHES    YELLOWSTONE        WY   MESONET

            PARKER PEAK SNOTEL

0750 AM     HEAVY SNOW       25 NE MORAN JUNCTION    44.15N 110.22W
09/22/2017  E23.00 INCHES    YELLOWSTONE        WY   MESONET

            TWO OCEAN PLATEAU SNOTEL

0752 AM     HEAVY SNOW       10 W PAHASKA            44.48N 110.16W
09/22/2017  E21.00 INCHES    YELLOWSTONE        WY   MESONET

            SYLVAN LAKE SNOTEL

0757 AM     HEAVY SNOW       6 ENE ALTA              43.78N 110.93W
09/22/2017  E18.00 INCHES    TETON              WY   MESONET

            GRAND TARGHEE SNOTEL

0759 AM     HEAVY SNOW       8 W SOUTH ENTRANCE      44.13N 110.83W
09/22/2017  E6.00 INCHES     TETON              WY   MESONET

            GRASSY LAKE SNOTEL

0800 AM     HEAVY SNOW       25 NW DUBOIS            43.75N 110.06W
09/22/2017  E13.00 INCHES    TETON              WY   MESONET

            TOGWOTEE PASS SNOTEL

0802 AM     SNOW             24 ESE BOULDER          42.65N 109.26W
09/22/2017  E4.00 INCHES     SUBLETTE           WY   MESONET

            BIG SANDY OPENING SNOTEL

0803 AM     HEAVY SNOW       16 SW DUBOIS            43.38N 109.88W
09/22/2017  E6.00 INCHES     SUBLETTE           WY   MESONET

            GUNSITE PASS SNOTEL

0804 AM     SNOW             14 W CROWHEART          43.28N 109.45W
09/22/2017  E5.00 INCHES     FREMONT            WY   MESONET

            COLD SPRINGS SNOTEL

0805 AM     SNOW             19 SSW LANDER           42.59N 108.90W
09/22/2017  E4.00 INCHES     FREMONT            WY   MESONET

            DEER PARK SNOTEL

0806 AM     HEAVY SNOW       18 W LANDER             42.87N 109.09W
09/22/2017  E6.00 INCHES     FREMONT            WY   MESONET

            HOBBS PARK SNOTEL

0808 AM     SNOW             6 WSW DUBOIS            43.50N 109.75W
09/22/2017  E4.00 INCHES     FREMONT            WY   MESONET

            LITTLE WARM SNOTEL

0811 AM     SNOW             26 NW LANDER            43.03N 109.17W
09/22/2017  E3.00 INCHES     FREMONT            WY   MESONET

            ST. LAWRENCE ALT SNOTEL

&&