...A SERIES OF LOWS TO MOVE IN FROM THE NORTHWEST THROUGHOUT THE
WEEK BRINGING PERIODS OF WIDESPREAD PRECIP AND OCCASIONAL T-STORMS...

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

Radar continues to show a band of precip around the SF Bay Area
inland near Sacramento south of I-80 with scattered showers and
thunderstorms across much of the rest of the state. Observations
over the past 6 hours report another 0.50-1.50" with the highest
totals from the Bay Area through to the northern Sierra where the
bulk of the precip is currently focused along a cold front.
Lightning detection is also reporting several strikes and flashes
across nrn/central CA as well as offshore. Forecast overall remains
on track, changes to the QPF over the next 6 days on the order of
0.10-0.75" up or down. Made some adjustments around the Bay Area/I-
80 corridor along the current band of precip to account for recent
observations. Still expecting a series of lows moving in from the
northwest to bring periods of widespread precipitation and
occasional thunderstorms. The current system will weaken into an
open trough later today swinging through the region through
Wednesday afternoon before the next system drops in from the
northwest into Thursday. That second system looks to exit by early
Friday with a break between systems and brief drying before another
larger low moves in from the Gulf of Alaska. Some uncertainty
remains on amounts from the weekend system as det and ensembles
disagree on the arrival time of that precip and the speed at which
it will spread across the region.

QPF from the rest of the current system through Wednesday afternoon:
1-4.50" Sierra/Transverse/San Diego mountains, 0.50-1.50" rest of
nrn/central CA, 0.30-1" coastal srn CA. While precip is generally
expected to be more widely scattered north of I-80, the QPF likely
underestimating anywhere thunderstorms may develop as models do not
accurately capture this. QPF the rest of the period: 3-5.50" nrn CA
coast Mendocino county northward (up to 7" King Range)/Shasta, 2.50-
5.25" nrn Sierra, 1.50-3" central/srn Sierra, 1-3.50" central coast
mountains, 1-2.50" most of the greater Bay Area and nrn Sac Valley,
0.25-1.25" SJ valley into the foothills, and 0.50-1" coastal srn CA
(1-2" San Gabriel/San Bernadino/San Jacinto/Laguna mountains).

Lower freezing levels throughout most of the week at around 3-5 kft
before rising into the weekend sw to ne. Levels up to 4.5-7.5 kft
from I-80 to southern Sierra Saturday afternoon increasing to 7-9
kft Sunday afternoon. By the evening, most of the Sierra will be
back up to 7-9.5 kft.