Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 200413
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
913 PM PDT Wed Apr 19 2017



.SYNOPSIS...
Shower chances into Thursday then dry and warmer for the weekend.

&&

.DISCUSSION...
Rain has been spreading inland this evening mainly north of
I-80. Some light rain in the Bay Area is slowly tracking its way
eastward and may bring the Sacramento area some light
precipitation in the next few hours. Snow levels continue to be
high and a not an issue this evening. Late at night colder air
will move into the region but precipitation should be tapering in
the Sierra Nevada to limit snow accumulations to a couple of
inches below pass levels. The system will move to the east during
the morning and any showers that are left will be ending over the
western slopes. Thursday looks to be a dry day for most people in
the interior.

.PREVIOUS DISCUSSION...
Trough is currently along the coast with a healthy band of
showers and isolated thunderstorms from Crescent City to Eureka.
Mesoscale models show this band transitioning eastward over the
Northern Sacramento valley into the evening. Activity will move
over Redding/Red Bluff from 8pm- 2am. Much less energy farther
south with this system and showers should be much lighter over the
Southern Sacramento valley. Valley rainfall amounts of 0.50-1.00
inches north valley and less than 0.25 inches south. Snow level
will be fairly high generally above 6000 feet. Snow amounts will
be light 1-3 inches for Interstate 80 Kingvale to Donner after
midnight. Higher peaks and around Lassen could have isolated
amounts up to 8 inches.

Showers will diminish rapidly Thursday morning and most areas
will turn dry and sunny during the afternoon. Dry conditions
through the weekend with a warming trend as valley high
temperatures climb towards 80 degrees. Weak system will brush the
Shasta county mountains Saturday night with isolated showers.

$$
.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)

A short wave will be exiting NorCal early Sunday with a weak ridge
building in. This will bring pleasant conditions for Sunday and
Sunday night with average to slightly above average temperatures.
Conditions remain quiet on Monday but clouds will start to build
into the area later in the day.

A more unsettled weather pattern is expected Monday night through
Wednesday night as we will be on the western edge of a long wave
trough. Not expecting heavy rain or any major systems though. The
greatest chance for rain looks to come on Tuesday with low level
warm air advection and some upper level engery. Greatest chances
will be in higher elevations and snow levels starting out above
7500-8000 feet and falling to around 6500-7000 feet later Tuesday.
Light shower chances will continue on Wednesday with a ridge
bringing quieter weather Thursday.



&&

.AVIATION...


Increasing chances for MVFR conditions for the northern Sac
valley tonight into early Thursday as a weak system moves through.
IFR conditions possible for mountain terminals with snow and
heavy rain reducing visibilities. Valley gusts up to 20 kts
possible this evening and upwards of 30 kts for the mountains
mainly through 10z Thursday.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$


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