Weather Service Report


988 
FXUS65 KREV 231112
AFDREV

Area Forecast Discussion
National Weather Service Reno NV
312 AM PST Mon Jan 23 2017

.SYNOPSIS...

Snow showers will diminish through the morning as our winter storm 
departs the region. Light snow showers with little additional 
accumulation may linger into Tuesday morning but overall dry and 
cold weather is expected for the middle to end of the week. Strong 
valley inversions will develop next weekend.

&&

.SHORT TERM...

One last main snow band is working its way across the western Sierra 
foothills and will provide the Tahoe Basin with some additional 
light to moderate snowfall through about 4-5am before most activity 
tapers off. All Winter Storm and Winter Weather Advisories will be 
allowed to expire early this morning with the exception of Mono 
County which will likely see moderate to heavy snow showers 
continuing until about 7-9am. Through the remainder of the afternoon 
and into Tuesday a few lingering light snow showers will be possible 
across the Sierra but little in the way of additional accumulations 
is expected. 

Some clearing will begin by Tuesday afternoon into Wednesday morning 
which will produce chilly morning temperatures along with chances 
for freezing fog for Sierra valleys. Single digit and sub-zero low 
temperatures can be expected for Sierra valleys by Wednesday morning 
with single digits and teens expected across western Nevada. High 
temperatures will remain in the lower to mid 30s for much of the 
Sierra and western Nevada through midweek. Fuentes

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

Forecast models have been rather consistent the past couple days in 
having a weak system undercut a ridge over the PACNW/British 
Columbia Wednesday night into Thursday. Simulations have been 
generating more qpf with each run as this wave dives offshore, 
gathering Pacific moisture, before moving inland and being absorbed 
into a large trough over much of the CONUS. Have introduced chances 
for precipitation Wednesday night and kept chances in through 
Thursday. Being that there is little in the way of forcing, doubt 
there will be much overall accumulation, but be prepared for 
nuisance snow showers for the Wednesday evening and Thursday morning 
commutes.

Ridge builds into the west for the weekend with a 1044 mb surface 
high building across the Great Basin, resulting in easterly flow and 
strengthening the inversions. Expect poor mixing and particulate 
build-up in the lower valleys with possible reductions to air 
quality. The big question will be if areas of freezing fog and/or 
low stratus will develop with the inversions in place, but we may 
not know for sure until we see how the rest of the week plays out.

The good news for those trying to dig out of the incredible amount 
of snow that had fallen this month in the Sierra is that the long 
range forecast keeps the area fairly dry through the start of 
February. There are some indications that moisture will return to 
the west by the end of the first week of February, but as always 
there is low confidence that far out. -Dawn


&&

.AVIATION...

Lingering snow showers will continue in the northern Sierra through 
about 8 am with a couple of additional inches of accumulation 
possible at KTRK and KTVL. For the southern Sierra, including KMMH, 
moderate to heavy snow will continue until around 9 am, tapering to 
showers through midday. An additional 3 to 6 inches of accumulation 
is possible. A secondary weak wave is likely to generate light snow
shower activity again in the Sierra late this afternoon into 
tonight. 

For western Nevada, the main event is over, but a few stray snow 
showers are possible which could put a light glaze on runways this 
morning. The greatest concern today will be continued mountain 
obscuration and scattered to broken low ceilings. There is a 20 
percent chance for additional snow showers late this afternoon into 
tonight, but any accumulation would be minimal. 

The system clears out of the area Tuesday with patchy freezing fog 
likely to develop Tuesday night into Wednesday morning in many 
Sierra valleys, including at KTRK and KTVL. -Dawn

&&

.REV Watches/Warnings/Advisories...
NV...Winter Weather Advisory until 4 AM PST early this morning NVZ005.

     Winter Storm Warning until 4 AM PST early this morning NVZ002.

     Winter Weather Advisory until 4 AM PST early this morning 
     NVZ001-004.

     Winter Weather Advisory until 4 AM PST early this morning NVZ003.

CA...Winter Weather Advisory until 4 AM PST early this morning CAZ071.

     Winter Weather Advisory until 4 AM PST early this morning CAZ070.

     Winter Storm Warning until 10 AM PST this morning CAZ073.

     Winter Storm Warning until 4 AM PST early this morning CAZ072.

&&

$$

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

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Western Regional Climate Center, wrcc@dri.edu