Area Forecast Discussion
Issued by NWS Reno, NV

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000
FXUS65 KREV 221014
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
314 AM PDT Sat Apr 22 2017

.SYNOPSIS...

A couple of weak systems will brush by to the north today and
Sunday for increasing winds and periods of clouds, with light
showers possible north of Susanville and Gerlach. For the first
part of next week, additional systems will bring breezy conditions
with light shower chances spreading farther south. Temperatures
will ease down to near or slightly below average next week.

&&

.SHORT TERM...

There has not been any significant change to the forecast through
Monday, with breezy afternoon and evening conditions each day
(especially today and Monday) along with increasing chances for
showers by Monday.

This morning, low pressure is approaching the far northern
California and southern Oregon coasts with a ridge of high pressure
shifting into central and eastern Nevada. This has caused winds
to begin increasing over Sierra ridges. By late morning and for
the afternoon, thermal gradients will increase across northeast
California and western Nevada as cooler air works into northern
California behind the exiting low. The gradient and mixing will
bring breezy conditions to the region, with gusts to 35 mph
(locally 40 mph) for many areas for the afternoon and/or evening.
With the gusty conditions expected, lake wind advisories will be
issued momentarily for Lake Tahoe and Pyramid Lake.

Late tonight and Sunday, a broad trough will move overhead bringing
additional cooling aloft along with a low chance for showers north
of Susanville and Gerlach. Highs Sunday are expected to fall 5 to
10 degrees when compared with today. Winds Sunday should be similar
or slightly lower than today as thermal gradients between the Sierra
and Basin and Range ease somewhat.

Monday, yet another fast-moving wave skirts by near the California-
Oregon-Nevada border. This will ease temperatures down another
5-10 degrees for many areas, with another boost in winds as flow
aloft increases and low-level thermal gradients intensify once
again. Precipitation-wise on Monday, simulations are not overly
keen on pushing precipitation east of the Sierra or south of Gerlach
as the main upper forcing remains north of the region. Even in the
Sierra and northeast CA QPF remains very light. However, with
moderate to strong winds aloft a few light showers could be
periodically shoved east of the Sierra so low-end POP remains
over western NV for Monday and Monday night. Snyder

.LONG TERM...Tuesday through Friday...
Few changes made to the long term with a moist west-northwest flow
for mid-week. Late week is a little more uncertain with just how
cold it will get on the back side of the cold front.

For Tuesday into Tuesday night, abundant moisture will continue to
stream across Northern California and Nevada. However, the best
forcing remains north into Oregon so any precip amounts will be
generally light. Snow levels look to remain 7-8000 feet for the most
part then drop a bit on Wednesday. Winds will continue to be gusty
from the west at times especially during the afternoon and evening
Tuesday.

The flow will buckle toward the end of the week as the ridge in the
East Pacific amplifies a bit. This will result in a more northwest
flow with a trough near the Four Corners. The GFS has the coldest
day as Thursday with the EC having it Friday behind a cold front. At
this point, split the difference and kept both days a bit chilly and
a few degrees below average. Either way, the front itself looks
rather dry with a few showers along it at best. Wallmann

&&

.AVIATION...
VFR conditions through Sunday with some afternoon breezes and peak
gusts to around 25 kts at area terminals from the SW. There will be
some light to moderate mtn wave turbulence with the increased winds
this weekend.

Early next week, a few showers are likely north of a KTVL to KLOL
line with some MVFR conditions possible. Winds will also increase
with more mountain wave turbulence and some isolated pockets of
LLWS. Wallmann

&&

.REV Watches/Warnings/Advisories...
NV...Lake Wind Advisory from 1 PM this afternoon to 9 PM PDT this
     evening for Pyramid Lake in NVZ004.

     Lake Wind Advisory from 1 PM this afternoon to 9 PM PDT this
     evening for Lake Tahoe in NVZ002.

CA...Lake Wind Advisory from 1 PM this afternoon to 9 PM PDT this
     evening for Lake Tahoe in CAZ072.

&&

$$

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



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