Wind Advisory 5, NWS Reno, NV

800 
WWUS75 KREV 171811
NPWREV

URGENT - WEATHER MESSAGE
National Weather Service Reno NV
1011 AM PST Wed Jan 17 2024

CAZ073-171915-
/O.EXP.KREV.WI.Y.0005.000000T0000Z-240117T1800Z/
Mono County-
Including the cities of Coleville, Bridgeport, Mammoth Lakes, and
Lee Vining
1011 AM PST Wed Jan 17 2024

...WIND ADVISORY HAS EXPIRED...

Wind gusts have subsided. Therefore the Wind Advisory has been 
allowed to expire.

$$

CAZ072-NVZ002-171915-
/O.EXP.KREV.LW.Y.0004.000000T0000Z-240117T1800Z/
Greater Lake Tahoe Area-
Including the cities of Stateline, Glenbrook, Truckee, Incline
Village, Tahoe City, South Lake Tahoe, and Markleeville
1011 AM PST Wed Jan 17 2024

...LAKE WIND ADVISORY HAS EXPIRED...

Wind gusts have subsided. Therefore the Lake Wind Advisory has been 
allowed to expire. Winds will continue to subside through the 
afternoon. However, a few gusts could reach 30 mph.

$$

CJ

Area Forecast Discussion
National Weather Service Reno NV
935 AM PST Tue Jan 16 2024

.UPDATE...

Freezing fog still blankets several valleys in northeastern
California, including the Honey Lake Basin, Susanville, and the
Sierra Valley as of 9:35 AM. As such, we have extended the
Freezing Fog Advisory through 1:00 PM PDT this afternoon for
Lassen-Eastern Plumas-Eastern Sierra counties. -Johnston

&&

.PREVIOUS DISCUSSION... /issued 308 AM PST Tue Jan 16 2024/

SYNOPSIS...

Areas of freezing fog and low stratus may impact many valley
locations through late morning. A warm Pacific storm will then bring
periods of rain, high elevation snow, and gusty winds this afternoon
into Wednesday morning. The latter half of week becomes dry and
milder before storm chances increase by the weekend.

DISCUSSION...

Satellite imagery and webcams around the region show only a few
areas with fog/low stratus development at the time of writing,
including Big Valley and Honey Lake Valley in Lassen County, Martis
Valley, northern portions of the Tahoe Basin, and portions of the
Basin & Range. These areas will likely see fog/low stratus expanding
in spatial coverage until increasing winds late morning/early
afternoon mix out valley inversions. All other valleys across
western NV and northeast CA, including the Carson Valley, have a 40%
chance of fog/low stratus development after 4 AM. Model soundings
aren't too supportive of valley fog/low stratus across the Truckee
Meadows, with only a 20% chance this morning.

A quick-moving upper level low is still slated to move into the
Pacific Northwest this afternoon and introduce increased upper-level
westerly flow over the region. 700 mb winds begin to increase late
morning, peaking around 40-50 kts just after midnight tonight. As
such, ridge winds will see gusts around 60-80 mph this afternoon
into early Wednesday morning. Valleys will see an uptick in south-
southwesterly winds this afternoon, though strongest winds look to
mix down to valley level on Wednesday afternoon.

A band of precipitation accompanies this upper-level low as the
westerly flow regime introduces warm subtropical moisture into the
region. High-res guidance indicates this band will start to move
into the Sierra and northeast CA around 4 PM today, with the window
for heaviest precip likely between around 8 PM-5 AM. Precip will
continue spreading southeast into the evening and overnight hours,
though far western NV and Mono County look to be heavily shadowed.
Snow levels will begin around 8000-8500 feet during the onset of
precipitation this afternoon, dropping gradually overnight to around
6500-7000 feet early Wednesday morning. As such, accumulating snow
will likely remain confined to the high Sierra, with 2-6 inches
still possible above 8000 feet. Liquid totals remain generally the
same as previous forecast along the Sierra crest, around 0.75-1".
The gradient east of the crest has become much sharper, with 0.1-
0.25" generally west of US-395 and only up to a few hundredths of an
inch east of US-395.

Ensembles show a ridge redeveloping over the western US from
Wednesday afternoon through the end of the work week, keeping above-
average temperatures and dry conditions in place. Confidence is
increasing for an active pattern to set up over the north Pacific
this weekend due to an extended Pacific jet, with ensembles showing
our next potential storm around the 19th-20th timeframe. While
impacts are still to be determined, this does look like another
warmer storm due to the subtropical influence. Whitlam

AVIATION...

* FZFG will continue to produce IFR-LIFR conditions through around
  17-19z at KTRK. Widespread areas of FZFG are also evident in
  valleys across Lassen County. Patchy fog is being observed in the
  Tahoe Basin, with a 20% chance to impact KTVL through 17-19z.

* Fog/low stratus is less evident across western Nevada this
  morning. There is a 40% chance for FZFG and low CIGS/VIS to impact
  KMEV-KCXP-KNFL through 17-19z. Lower chances (20%) exist for
  impacts to KRNO.

* A quick-moving, relatively warmer storm brings increased westerly
  flow aloft in addition to increased chances for precipitation to
  the Sierra and northeast CA starting after 00z this afternoon.
  FL100 winds look to peak around 40-50 kts overnight Tuesday into
  early Wednesday morning, which may create LLWS and turbulence
  impacts regionwide.

Whitlam

AVALANCHE...

Rain-on-snow and strong ridge-level winds will be the biggest
avalanche weather concerns with our next storm moving in this
afternoon.

* Snow Levels: Start around 8000-8500 feet at the onset of
  precipitation this afternoon, dropping to 6500-7000 feet early
  Wednesday morning. As such, areas between 7000-8000 feet are most
  likely to see rain-on-snow impacts.

* Snow Ratio: This will be a right side up storm, with heavy, wet
  snow (6-8:1) becoming lighter (8-10:1) by the end of the event.

* SWE: Will be light for Sierra standards, with substantial
  shadowing in the Tahoe Basin/Mono County. Along the Sierra crest,
  0.75-1". For the Tahoe Basin, 0.5-0.75" on the west side of the
  lake, dropping to 0.1-0.25" on the east side of the lake.

* Winds: South-southwesterly winds with gusts to 60-80 mph at ridge
  levels and 40-60 mph along mid-slopes this afternoon into early
  Wednesday morning.

Whitlam

&&

.REV Watches/Warnings/Advisories...
NV...None.
CA...Freezing Fog Advisory until 1 PM PST this afternoon CAZ071.

&&