...LOW PRESSURE IMPACTS THE REGION THIS WEEKEND INTO EARLY NEXT
WEEK...

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

A narrow wavelength upr ridge is situated from just off the southern
CA coast north-northeast to the interior of the Pacific Northwest
stretching up into west-central Canada. This feature is sandwiched
between two areas of low pressure with the first over the Great
Basin moving off toward the southeast and another upstream just west
of Vancouver Island. This second area of low pressure will drop
southward through the weekend...increasing the likelihood of precip
each day into early next week with the peak being Sunday into Monday.

For today...the exiting low over the Great Basin may generate some
build ups over the southern Sierra with the potential for some stray
showers developing. Also...with afternoon heating and the
approaching system down the west coast...there may be some scattered
showers and even a thunderstorm per SPC across the northern CA
coastal mountains mainly from the Eel River basin northward.

The area of low pressure will settle off the CA coast on Saturday
into Sunday with increasing diffluent flow aloft in the northeast
quadrant of this feature. This places the best opportunity for
precip from the Trinity Mountains eastward across the Shasta Lake
drainage and northeast CA Plateau along with the northern/central
Sierra. The SPC Day 2 Convective Outlook does highlight these areas
for the potential of general thunderstorm activity.

Monday into Tuesday sees the primary circulation reaching its
farthest south location off the central CA coast before slowly
swinging inland and exiting the region across the lower Colorado
River basin. On Monday...best precip will be aligned along the
length of the Sierra and then points east across the northern half
of NV. These locations are also inside a broad area of general
thunderstorms drawn on the SPC Day 3 Convective Outlook.

After this system exits to the east...an upr ridge will slide across
the area for dry and warmer conditions during the middle of next
week.

Freezing levels are currently from 9000-feet across northeast NV to
12000-feet or so along coastal locations. Into Saturday...as the
Great Basin low moves out...a broad area of 11000- to 13000-feet
will spread across the entire area. Then as the area of low pressure
moves across central and southern CA into southern NV...the core of
the system will bring freezing levels down to 7000- to 8000-feet
from later Sunday into later Tuesday.

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.