...UNSETTLED CONDITIONS CONTINUE THROUGH THE WEEKEND...
...BEST PRECIP CENTRAL/SOUTHERN SIERRA ALONG WITH NV TOWARD SOCAL...

.METEOROLOGICAL CONDITIONS (SAT AM - FRI AM)...

Troffing just off the west coast has sharpened up a bit over the
past 24 hours...while a disturbance diving down the upstream side of
the system has reached its southernmost location below 30N...and is
starting to make its way off to the east. A sfc low pressure just
ahead of this feature is deepening and will work to draw ample low
latitude moisture toward portions of southern CA and the Desert
Southwest. Ahead of the overall troffing...scattered showers
continue to impact the region with the focus of the best precip
mainly near and north of I-80 in NV...while over the past hour an
area of convection has developed over eastern Calaveras County and
is now making its way to the north-northeast with several lightning
strikes/flashes detected within these cells.

The next 24 hours will see the trof axis move inland across northern
and central CA...stretching along 120W by 01/12Z. The area of low
pressure near the base of the system will continue to track
eastward...on its way to northern Baja. Best precip will be focused
across the central/southern Sierra picking up in coverage and
intensity later this afternoon and through the overnight hours. This
will also be the case for much of the state of NV...which will sit
in the diffluent flow aloft from the approaching trof.
Finally...coastal southern CA will see precip increase as moisture
increases ahead of the approaching area of low pressure with the
best amounts between Los Angeles and San Diego. Overall totals
should range between 0.25- to 0.75-inch with locally higher amounts
approaching 1.00-inch...especially the central/southern Sierra.

Sunday will see the trof axis continues to press inland with the
area of low pressure moving inland across northern Baja. Models have
been relatively consistent with this thinking for the past couple
days now...which should keep the heaviest precip south of the CA/MX
border and then farther east across the Desert Southwest. Best
precip on Sunday will fall during the first half of the day between
01/12Z and 02/00Z before tapering off after sunset. Highest totals
will be focused on eastern NV (0.25- to 0.75-inch) with lesser
totals over the southern Sierra down toward coastal southern CA
inland toward the southeast CA deserts (0.10- to 0.33-inch).

Drying conditions on Monday into early Tuesday will be courtesy of a
short-wavelength transitory upr ridge that will quickly slide across
the area. Models do show a compact s/wv trof riding eastward across
the Pacific mainly just below 40N reaching the west coast a bit
quicker than yesterday/s thinking. Details are still a bit different
amongst the models with timing and coverage of the light precip
moving across northern CA into northern NV on later Tuesday into
Wednesday...but at this time...amounts do appear as if they will
remain light given the lack of any significant moisture entrained
into this feature with a very narrow line of 1.00-inch PW eroding as
it interacts with the coast. Beyond this...models are struggling
with the depth of a follow-up system moving mainly toward the
Pacific Northwest later Wednesday into Thursday. For now...kept
light precip confined to far northern areas.

Please Note: This product may NOT be routinely updated.
Please refer to the following product issued by the CNRFC
www.cnrfc.noaa.gov/Daily-Briefing for a graphical summary of
weather and hydrologic conditions.