Area Forecast Discussion
Issued by NWS Reno, NV

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FXUS65 KREV 240824

Area Forecast Discussion
National Weather Service Reno NV
124 AM PDT Sun Sep 24 2017


Clear skies and light winds are expected for the rest of this
weekend and next week. A ridge of high pressure along the west
coast is gradually getting stronger leading to a slow warming



Adjustments were modest with generally benign conditions
anticipated for the near future. The only appreciable weather will
be areas of freezing fog in the Truckee and Sierra Valley areas as
well as colder than average temperatures.

Winds along the Sierra crest were increased a little as
persistent easterly ridge flow couples with higher stability
factors in valleys and aloft...somewhat analogous to holding your
thumb over the end of a water hose to get a stronger stream.
Ridges in the Tahoe Basin through Mono County will generally see
wind gusts 20-25 mph with maximum gusts up to 30 mph. While these
gusts are not impressive by Sierra standards, these speeds will
have implications for wind chills and could be a threat to hikers
along the higher Sierra if unprepared.

Otherwise, northerly flow has been stunting the warming trend
resulting in observed afternoon highs that have trended below
forecast values. As such, daily highs were cooled a couple degrees
each day through Monday while flow remains more northerly over
western Nevada. The ridge axis builds inland by Tuesday shifting
surface winds more easterly and allowing for more rapid warming.

.LONG TERM...Wednesday onward...

Main changes were to slightly cool temperatures as the upper
ridge is not as amplified as previously progged. The past few
model cycles have been a bit slower to expand the ridge into the
west and actually keep a remnant piece of the exiting low as a
weakness under the ridge. The only impact appears to be the couple
of degrees of cooling, but this still would lead to upper 70s to
low 80s for western Nevada valleys and upper 60s to low 70s for
Sierra valleys. These temperatures are a bit above normal for this
time of the year. Otherwise, conditions remain tranquil with
generally light winds and no precipitation expected.

Looking a bit farther out, long range models have been indicating
a deep trough approaching the west coast around the middle of the
first week of October. This would bring cooler temps back into the
forecast along with wind and chances for precipitation. -Dawn



Widespread VFR conditions are anticipated the remainder of the
weekend and into the work week outside of early morning FZFG in
some Sierra Valleys, including the Martis Valley and KTRK. Skies
will be clear to partly cloudy with winds light and generally
from the north to east in direction through midweek. -Dawn


.REV Watches/Warnings/Advisories...


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