Placerville, CA (near 1,850 ft. elevation - 95667)

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Weather Forecast Discussion

000
FXUS66 KSTO 231054
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
254 AM PST Sun Jan 23 2022

.SYNOPSIS...
Lighter north to east winds today and continuing this week with
dry weather. Some light precipitation is possible late in the
week.

&&

.DISCUSSION...
High pressure ridging continues over Northern California with a
low pressure system centered in southwest Arizona gradually moving
eastward today. The east-west surface pressure gradient has
weakened quite a bit, with 7.0 mb from Reno and Sacramento,
compared to 12.1 mb at 9 am yesterday. Winds in the mountains have
decreased, with the strongest gust at 2 am being 42 mph at
Wallace Peak, with other high elevation sites gusting up to 25 mph
to 35 mph. Winds are expected to gradually decrease through the
day, so the Wind Advisory for zones 68 and 69 has been cancelled.
Winds in the Valley and Delta will be much lighter today than
yesterday, out of the north at around 10 to 15 mph for the
northern Sacramento Valley, 5 to 10 mph elsewhere. Light north to
east winds continue over the short term forecast period.

Early morning temperatures were quite mild for the northern
Sacramento Valley where north winds continue at 5 to 15 mph.
Redding was 60 at 2 am. It`s a different story for the southern
Sacramento Valley, northern San Joaquin Valley and Delta, with
light winds and radiational cooling allowing temperatures to
already drop into the upper 30s and lower 40s. Temperatures there
are 10 to 20 degrees colder than the same time yesterday. Patches
of frost are possible as temperatures cool into the mid 30s. Cool
mornings will be the pattern through Thursday. Highs will warm
into the 70s over the northern Sacramento Valley, in the 60s to
the south.

Satellite and surface observations show some fog is developing
this morning in the Valley along the rivers with clear skies and
light winds. Local patches of dense fog are possible in the
southern Sacramento and northern San Joaquin valleys. The HREF
suggests this fog will be short lived, though, as light north
winds increase and bring clearing north of I80 by around 9 am, 11
am for Stockton and Modesto.

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)...
Ensembles and clusters remain in solid agreement with upper level
ridging over the West Coast through the middle of the week
maintaining dry and mild weather. Uncertainty in the forecast
increases by next weekend with a weak trough indicated in the
ensemble mean and some of the clusters for Friday into Saturday
resulting in a few showers over the far northern portion of the
state. Ridging likely to return next Sunday, but an increasing
number of clusters indicate a potential shift toward a wetter
pattern for the end of January heading into early February. &&

.AVIATION...
VFR conditions predominate the next 24 hours except for areas of
MVFR, with local IFR/LIFR, in the Central Valley south of KCIC
through about 18Z. Local northeast to east surface wind gusts
20-30 kts northern Sierra Nevada until 20Z. &&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

Hazardous Weather Outlook

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