Area Forecast Discussion
Issued by NWS Reno, NV

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797
FXUS65 KREV 262038
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
138 PM PDT Wed Apr 26 2017

.SYNOPSIS...
Windy conditions with light Sierra showers will continue into
tonight as low pressure moves through northern Nevada.
Temperatures will remain on the cool side through the end of the
week. High pressure returns for the weekend with warm and dry
weather.

&&

.SHORT TERM...

So far today gusty winds have remained in the usual wind prone
locations along US-395/I-580 with peak gusts of 40-50 mph. High
resolution models are focusing the strongest winds this
afternoon/evening from Pyramid Lake/Reno area through Lyon,
Churchill and Mineral Counties. This will primarily impact those
on I-80 from Reno to US 95, US-50 from Carson to Fallon, and
US-95 from I-80 to Tonopah. Winds should start to weaken around
8pm or so, though gusty north to northwest winds will continue
overnight and into tomorrow. Only wind impact for Thursday would
be on Pyramid Lake where the northwest winds are aligned with the
long lake axis which may help increase speeds and kick up some 3
foot waves. Those heading out to fish or boat on Pyramid should
be cautious of choppy or even rough lake conditions.

Light showers along the Sierra Crest from Plumas-Eureka State Park
to Tioga Pass will continue into tonight due to moist upslope
flow. Snow levels are above 8000 feet, so not expecting any major
travel impacts. A second round warm air advection showers will
over southern Oregon and northern California will pass across the
region from late afternoon and tonight, but with only light
rainfall amounts.

High pressure to build into the west on Friday with an area of
low pressure developing over the 4-Corners region. This will
reinforce the chilly north to northeast surface flow and keep
afternoon highs in the 50s to near 60 across the region.

The start of the weekend looks warm and dry, though models are
hinting at the potential for a northeast to east wind event in the
Sierra. While current models don`t look overly strong a few gusts
up near 30 mph are possible late Friday night and early Saturday
morning. Impact here would be increased wave heights into the
west shore of Tahoe. Brong

.LONG TERM...Sunday through Wednesday...

No large changes were made to the existing forecast which is
largely benign. The east Pacific ridge remains the dominant
weather feature and is expected shift eastward Sunday/Monday.
Expect warming temperatures into the low/mid 70s for western
Nevada and low 60s for Sierra Valleys.

Temperatures fluctuate more Tuesday and Wednesday as a dry,
backdoor front moves through the region. Winds will increase
becoming breezy and keeping conditions feeling cooler than the mid
60s that are forecast. Otherwise, expect river flows to trend
higher, especially for the Walker and Carson river systems which
have fewer control measures than the Truckee River system. Water
temperatures will remain dangerously cold, and it is recommended
to stay out of rivers during these elevated flows.

Models become much less reliable past Wednesday, but do hint at
the potential of a pattern shift. GFS is more realistic showing a
break-down of the ridge with northern Pacific troughs moving
through the Pacific Northwest. This scenario is more reasonable
than the EC which begins to translate the large ridge into the
inter-mountain West. Boyd

&&

.AVIATION...

Breezy to gusty conditions will continue into the evening for most
terminals and through the night for MMH. Rotors at RNO presented a
LLWS threat that has largely diminished since surface winds have
phased with winds aloft. Still, expect speed and directional shear
to remain for Sierra locations through the day where terrain
induced surface winds are transverse to faster flow aloft.
Mountain wave turbulence will continue overnight with ridge winds
remaining elevated.

Precipitation chances have largely decreased, but there could
still be a few Sierra showers to contend with. Mountain
obscurations continue to be certain, but will improve tomorrow as
drier air moves over the ridges.

Winds decrease tomorrow, but remain breezy with flow becoming more
northerly. Flight conditions improve this weekend as high pressure
moves over the region allowing for warming temperatures. The only
threat to operations will be any thaw of snow near runways that
refreezes on runway surfaces overnight; TVL, TRK, MMH. Boyd

&&

.REV Watches/Warnings/Advisories...
NV...Wind Advisory until 8 PM PDT this evening NVZ001-004.

     Wind Advisory until 8 PM PDT this evening NVZ005.

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

CA...Wind Advisory until 8 PM PDT this evening CAZ070.

     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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