Area Forecast Discussion
Issued by NWS Reno, NV

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744
FXUS65 KREV 242024
AFDREV

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

.SYNOPSIS...

Clear skies and light winds are expected through the coming week.
A ridge of high pressure along the west coast is gradually getting
stronger leading to a slow warming trend. A weak upper level wave
will brush by the region by the end of next weekend and could
bring a few showers to the Oregon border.

&&

.DISCUSSION...

Very few changes were made to the forecast this cycle. Northeast
to east wind in the low to mid levels continues through much of
the week as a ridge develops to the west with a longwave trough
well to the east. The presence of the northeast to east flow is
likely to delay our warmup through the week so both high and low
temperatures were kept on the low end of recent model guidance.

While winds will be light in the valleys...the one area where
gusty winds will continue for a few more nights will be over the
higher ridges...the Sierra crest especially. This is largely due
to thermal gradients across the Sierra...but a pressure gradient
aloft remains in place as well as an upper low develops in the
lower Colorado Valley along the AZ/CA border. Wind gusts were
close to 50 mph over the Sierra ridges last night. They should not
be that strong tonight...maybe 30-40 mph. These easterly winds
could occasionally surface down to Lake Tahoe where gusty east
winds up to 20 mph are possible late tonight.

The dry northerly flow will begin to give way to westerly flow
aloft by late Friday night into the weekend. This is in response
to the longwave trough...and the upper low over the lower
Colorado Valley...sliding east with a flat ridge to moving into
the region. This will also allow a weak shortwave trough to move
into the Pac NW by late in the weekend and scrape by the far
northern parts of the forecast area. While no more than a slight
chance...there is the possibility that a few showers could develop
near the Oregon border late next Sunday evening. NC

&&

.AVIATION...

VFR conditions with light winds will persist through much of the
week. The exception will be occasional fog in the Martis and
Sierra Valleys each morning that could produce MVFR to IFR
conditions just before and after sunrise each day. And gusty east
winds will continue over the Sierra ridges tonight and Monday
night with the possibility of light to moderate turbulence along
and west of the ridgeline. SU

&&

.REV Watches/Warnings/Advisories...
NV...None.
CA...None.
&&

$$

For more information from the National Weather Service visit...
http://weather.gov/reno



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