...COOLER WITH ROUNDS OF PRECIP POSSIBLE TODAY THROUGH EARLY THU...
...DRYING WITH WARMER TEMPS EXPECTED FRI INTO THE WEEKEND...

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

The pattern shift expected this week is currently underway as the
strong high pressure that had influenced conditions across the
western US has finally moved well downstream of the area...leaving
behind onshore west to southwest flow. The well-above average
temperatures peaked over the weekend on either Saturday or Sunday
depending on location...with a transition to near or even below
normal temperatures anticipated from Tuesday through Thursday.

The first s/wv trof in a series is currently moving across the
Pacific Northwest elongating back toward an upr low that is finally
opening up over the eastern Pacific near 35N/140W. Radar imagery
does show some weak echoes streaming onshore across the northern CA
coast from about Eureka/Arcata northward...moving off toward the
east-northeast. So far...precip gauges have been rather inactive
under this precip with most likely a fairly dry lower layer of the
atmosphere to overcome. Overall...this first disturbance should
eventually bring some light precip to areas near the CA/OR border
with amounts generally from 0.10-inch or less.

Into Tuesday...look for the s/wv trof west of the CA coast to reach
the coastal waters during the later morning or early afternoon
hours...bringing widespread light precip to much of the region with
a focus on the length of the Sierra (0.25- to 0.75-inch) as well as
parts of east-central NV (0.25- to 0.50-inch). Elsewhere...amounts
are expected to be from a few hundredths of an inch up to approx
0.25-inch. This disturbance will quickly shift inland...exiting the
Great Basin sometime during the late hours on Tuesday or early
morning hour on Wednesday.

The final s/wv trof in this series is anticipated to drop southeast
out of the Gulf of Alaska and then move inland over the Pacific
Northwest and northern CA on Wednesday. This feature looks to bring
in the coolest air aloft...and the best chance of precip over the
higher terrain of northern CA with more favorable forcing. Look for
totals along the coast from 0.50-inch over the upper Russian River
basin up to 2.50-inches over the Smith River basin. Inland amounts
from the southern Cascades down across the Shasta Lake drainage and
northern/central Sierra will range from 0.75- to 1.50-inches.
Elsewhere across CA...amounts will be limited with 0.25-inch or less
across the Sacramento Valley and SF Bay Area. Farther to the
east...across NV...the best totals will be from about I-80 northward
with anywhere from 0.10- to 0.33-inch.

Freezing levels on Monday will start from 9000-feet near the CA/OR
border to 13000-feet south near the CA/MX border...and will drop
anywhere from 1000- to 2000-feet by Tuesday morning. This next wave
will continue the slight drop...down to about 5000- to 6000-feet
northwest to 10000-feet far south. Then as the last disturbance
crosses the area...look for a very sharp gradient across the region
with 3500-feet northwest...6000-feet along I-80...and 10000- to
13000-feet for southern areas.

After the last system exits the region on Thursday...look for
temperatures to rebound above normal this weekend as high pressure
builds along the west coast. Dry conditions are also anticipated.

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.