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FXUS65 KREV 272007

Area Forecast Discussion
National Weather Service Reno NV
107 PM PDT Wed Oct 27 2021


High pressure continues to dominate our weather pattern through
Friday with very pleasant conditions. Patchy freezing fog is
possible by early Thursday morning across portions of the colder
Sierra valleys. Overnight Friday into Saturday, a weak disturbance
will bring rain chances to areas north of Interstate 80 with a
slight chance for a wintry mix at higher elevations. The storm
track will remain favorable through the first part of November for
a few additional rounds of precipitation.


.SHORT TERM (Through Friday Night)...

No complaints about the weather over the next day or two as
ridging continues to build eastward over the Great Basin with less
cloud cover expected this afternoon compared to this time
yesterday. Highs today will be near seasonal normals - low/mid 60s
in the lower valleys and Western Nevada, with mid to upper 50s in
our elevation cities. The main concern in the next 24 hours will
be the possibility for patchy freezing fog across some of the fog
prone areas (Sierra Valley, Truckee, South Lake Tahoe). Lower
cloud cover than previous days, light winds, and temp = dewpoint
by late overnight into early morning will be the driving factors
behind the fog threat. With temperatures bottoming out in the 20s
across the aforementioned valleys, expect this to be freezing fog.
Model forecast soundings along with MOS guidance suggests high
level clouds will roll in across the area overnight Thu/Fri which
will limit cooling so fog formation is doubtful on Friday and will
leave it out of the forecast for now.

Simulations continue to show a progressive short wave traversing
eastward into Northern Cal late Friday night into early Saturday.
The highest chances for rain will be north of I-80 where the
greatest energy along with moisture will be. PoPS will range from
10% near I-80 to 30% near Surprise Valley in extreme NE CA. Don`t
expect much in the way of rainfall due to the showery nature and
rather meager (but not completely unfavorable) conditions. The
wetter solution has at most 0.20 inches over a 12 hour period - so
no major concerns expected with this precip. Snow levels between
8,000-9,000 feet appear to preclude any snowfall - except perhaps
some wintry mix at the highest elevations of NE California and NW


.LONG TERM (Saturday through next Wednesday)...

Late Friday night into early Saturday, ensemble simulations and
clusters continue to show a weak short-wave trough crossing the
southern Cascades and northeastern California. How far south and
deep the trough digs is still in question as the GEFS and EC-ENS
have differing solutions. This is also seen within the clusters,
with a couple of simulations showing a deeper trough, while the
other three show a rather weak wave crossing northern California.
Considering everything, we look to see a brief change to the
weather across northern California and far northwestern Nevada
into early Saturday, with rain and high elevation mixed
precipitation (snow levels between 8,000 to 9,000 feet) expected.
Total precipitation amounts look to be between a few hundredths of
an inch just west of the Lake Tahoe Basin to closer to a tenth of
an inch across northeastern California and northwestern Nevada.
Showers look to diminish by the evening hours Saturday across the
northern Sierra and northeast California, with a few light rain
showers possible along the cold front east into western Nevada.
Temperatures look to remain near average for this time of year
Saturday and Sunday.

Monday into Tuesday, another short-wave trough may bring our
first shot of November weather to the region. Only two of the five
ensemble clusters are in agreement bringing rain and very high
elevation snow showers to the western slopes of the Sierra, with
very little if any spillover expected into far western Nevada.
This is due to the trough lifting into the PacNW and avoiding a
direct hit with the Sierra. With such a low confidence forecast,
we only have at most 25-35% PoPs north of US-50 into northeastern
California for the Monday into Tuesday timeframe. We`ll continue
to keep our eyes on this one for any changes.




Rather benign weather pattern in place through today and
tomorrow, resulting in favorable conditions for aviation interests
with prevailing VFR for the NV terminals. TRK and TVL will
experience freezing fog early tomorrow morning with LIFR and MVFR
vsby carried in the TAFs, respectively. This will break by 16Z-17Z
with VFR returning through the remainder of the period.

Moving into the weekend, a weak low pressure system will work its
way into NE California and NW Nevada. This will bring the chance
for showers to the area, primarily north of Interstate 80 Friday
night into Saturday morning. Local flight restrictions may be
possible with this precipitation. However, no snowfall is
anticipated due to high snow levels.



.REV Watches/Warnings/Advisories...


For more information from the National Weather Service visit...

Previous Forecast Discussions may be found at
NWS Reno, NV (REV) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)

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