...TURNING COOLER WITH WETTER WEATHER LATER WED THRU THE WEEKEND...

.METEOROLOGICAL CONDITIONS (MON PM - SUN AM)...

The next couple days will continue to bring warm and dry conditions
to the region as an upr ridge slides across the west coast. This is
all ahead of an area of low pressure spinning over the eastern
Pacific in the vicinity of 38N/140W that will slowly make its way
generally eastward before reaching the northern CA coastal waters on
Thursday and then dropping to the southeast through the weekend
before exiting the region along the CA/MX border. Initially...look
for scattered precip to develop in the diffluent area of the upr low
on Wednesday...primarily impacting coastal areas from Cape Mendocino
northward and then inland over the Shasta Lake drainage. SPC does
paint an area of thunderstorms over interior northern CA centered on
Shasta Lake on Wednesday.

From Thursday through Saturday...as the upr low nears the coast
along with a narrow north-to-south oriented channel of moisture that
originated in the lower latitudes with PW values near 1.00-inch
ahead of the primary circulation...look for the opportunity of
precip to increase initially across northern CA on Thursday. Then
as the upr low tracks southeast parallel to the CA coast...precip
chances increase over central and southern CA. With moist onshore
south to southwest flow in the low-levels and the elevated available
moisture...look for widespread precip to move across coastal
southern CA. Also...with the core of the cooler airmass moving
overhead...the potential for convection precip is also possible.

Finally by later Saturday...this initial feature will rotate toward
the lower Colorado River basin. However...a secondary system moving
toward the west coast from the Gulf of Alaska later Saturday into
Sunday may continue precip across northern areas through the rest of
the weekend. However...run-to-run consistency with the track of this
disturbance isn/t too great at this time with confidence lowering by
the end of the forecast period.

Overall changes from the morning forecast were to increase amounts
about 0.10- to 0.50-inch for coastal sections...while inland over
the length of the Sierra the boosts to amounts where from 0.25- to
0.75-inch.

Freezing levels will generally be elevated for this event...but show
some decreases as the cooler airmass moves overhead later Friday
into Saturday. Look for 9000- to 12000-feet freezing levels going
down to about 7000- to 10000-feet on Saturday...lowest along coastal
locations.