046 
FXUS66 KSTO 151707
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1007 AM PDT WED JUN 15 2016


.SYNOPSIS...
Low pressure will result in unseasonably cool and unsettled
weather across the region through the end of the week. Showers,
thunderstorms, and high elevation snow will be possible.
Temperatures will begin to warm up Friday and over the weekend.

&&

.DISCUSSION...
Forecast for today looks on track as a trough moves in from the
north. Currently, some mid level clouds and virga over our area.
Still looks as though there will be enough instability combined
with a short wave moving through to initiate some heavier showers
and thunderstorms over the northern valley/mountains this
afternoon.

&&

.PREVIOUS DISCUSSION... 
Cool and unsettled weather will dominate
NorCal's weather the next several days as the trough deepens.
Temperatures will be well- below average for mid-June, and quite a
bit of shower and some thunderstorm activity is expected. The best
chance for more widespread shower activity will occur later
tonight and Thursday as a stronger wave pivots through the region.

The higher elevations around the Lassen Park area may see some
significant accumulating snowfall, otherwise the main impacts from
the system will be cold and breezy weather.

Moderating temperatures are expected heading into the weekend as
the main part of the trough lifts up into the northern Rockies.

&&
.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)

High pressure over the southwestern U.S. Will keep the forecast area
dry through the extended period. As the upper High center
retrogrades westward...temperatures will warm. Daytime highs will
start out just above normal on Sunday then climb to 10 to 15
degrees above normal by mid week. Significantly strong winds are
not expected but may become locally breezy at times as weak
disturbances pivot through upper level southwest flow. 


&&

.AVIATION...


VFR conditions next 24 hours except possible MVFR/IFR conditions
in showers or thunderstorms northern mountains and northern
Sacramento valley this afternoon and evening. Breezy southerly
winds with gusts to 30 mph through the delta and over Sierra
Cascades.


&&

.STO Watches/Warnings/Advisories...
Winter Storm Watch from this evening through Thursday afternoon 
for Western Plumas County/Lassen Park.

&&

$$