Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Sacramento California
917 am PDT Sat Apr 25 2015
a fast moving wet system pushes out of the area today with
scattered showers continuing across the mountains through this evening.
High pressure brings dry conditions Sunday through mid week next
week. Warmest temperatures Monday with slight cooling trend
through the end of the week.
some showers are continuing at this time over the
mountains...mainly from around I-80 southward. Showers are
expected to continue into the evening hours before ending. In
general most valley areas will remain dry today but there is a
slight chance of a few showers in the valley from around
Sacramento southward through the afternoon. Sacramento County and
places to the east in the mountains received the most amount of
rainfall from this storm with amounts less as you go north or
south of the Sacramento region. Highest snowfall report this
morning was 13 inches from near Kirkwood.
High pressure will build over the region Sunday into Monday to
bring dry and warming temperatures to the region. Northerly winds
will persist the next few days but nothing of significant strength
to cause any concern. The warmest temperatures will occur on
Monday and Tuesday of this coming week followed by a cooling
trend later in the week.
Extended discussion (wednesday through saturday)
High amplitude ridge forecast to break down and shift east
Wednesday as upstream trough digs southeastward from the Gulf of
Alaska. Result will be increasing onshore flow with minor synoptic
cooling trend. Trough is progged to move across norcal Thursday
with the GFS/Gem digging it further south than the ec. Continue to
lean forecast toward the deeper solutions and will continue to
mention a threat of showers and thunderstorms over the northern
mountains Thursday afternoon into evening. Greater cooling
expected Thursday. Models differ from broad troughing aloft to
weak upper ridging Friday into Saturday, but all suggest drier
weather with a slight increase in Max temps.
Slowly improving conditions across interior northern California as
weather system exits the region. Primarily VFR conditions and
light winds are expected the next 24 hours across valley taf
sites, although some local MVFR/IFR ceilings will be possible
through early afternoon. Over the mountains, scattered IFR/LIFR
showers will continue through the afternoon, then improve tonight.
Snow levels remain between 5000-6000 feet.
Winter Weather Advisory until 5 PM PDT this afternoon above 5000
feet in the West Slope northern Sierra Nevada...western Plumas