Area Forecast Discussion
Issued by NWS Reno, NV

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FXUS65 KREV 142202
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
302 PM PDT Thu Sep 14 2017

.SYNOPSIS...

Northerly flow will usher in the coolest temperatures of the past
three months on Friday, with a modest warmup for the weekend.
Below average temperatures with increased winds and a chance for
showers are expected next week starting on Tuesday as a strong
front moves through. Low temperatures by the middle of next week
could bring a light frost to colder western Nevada valleys.

&&

.SHORT TERM...

A cold front is draped across far northern Lassen and Washoe
Counties this afternoon as it awaits a push from an upper low
moving into the Pacific Northwest. Isolated showers and
thunderstorms have developed north of Susanville near the front
and downwind of Lassen Peak, as well as east of I-80/Highway 95
out in the Basin and Range. Storms should remain much weaker than
yesterday.

Tonight and Friday morning, the front will drive south through
Mineral and Mono Counties. Precipitation is expected to wane with
the front as it drops south tonight as forcing is lost with the
upper trough axis passing into central Nevada. Therefore, a few
light showers could limp down to around Highway 50 late tonight
before precipitation along the front dissipates.

Friday will bring highs around 10 degrees below average with light
northerly flow behind tonight`s front, with highs rebounding to
near average by Sunday as flow aloft returns to a milder westerly
direction. Temperatures by Saturday morning are expected to
briefly (generally less than 2 hours) bottom out in the mid to
upper 30s for colder western Nevada and northeast California
valleys, so very sensitive vegetation could be affected.
-Snyder

.LONG TERM...Monday through Thursday...

Little change to the long term forecast. Late Monday and Tuesday,
a much stronger cold front remains on track. The front looks to
move through fairly quickly with the main impact being gusty winds.
Wind gusts 35-50 mph with locally higher gusts in wind-prone
areas will be possible by Monday afternoon and evening, with gusts
80+ mph over higher exposed ridges.

Lows could dip into the 30s once again for colder western
Nevada/northeast CA valleys by Wednesday morning with highs only
reaching the 60s on Tuesday. However, there are discrepancies with
the ECMWF bringing stronger post-frontal impulses down WED and
THU mornings which would tend to bring cooler afternoon
temperatures but also warmer overnight lows due to cloud cover
and/or showers. -Snyder

&&

.AVIATION...

Isolated thunderstorms north of about a Portola to Pyramid Lake
line into far western Nevada, and north of Highway 50 in west-
central Nevada this evening could bring gusts to 30-35 kts and a
few cloud-to-ground lightning strikes. Elsewhere, evening wind
gusts to up to around 25 kts are expected, with a few showers
possibly down to around Highway 50 late tonight.

Dry conditions with light northerly flow is expected Friday as
weak high pressure builds into western Nevada and northeast
California. A strong cold front is expected late Monday into
Tuesday, with gusty winds to 35-45 kts and stronger mtn wave
activity the main threats to aviation. -Snyder/Wallmann

&&

.REV Watches/Warnings/Advisories...
NV...Lake Wind Advisory until 8 PM PDT this evening for Pyramid Lake
     in NVZ004.

     Lake Wind Advisory until 8 PM PDT this evening for Lake Tahoe in
     NVZ002.

CA...Lake Wind Advisory until 8 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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