Auburn, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

417
FXUS66 KSTO 031018
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
218 AM PST Tue Dec 3 2024

.SYNOPSIS...
Areas of low elevation morning fog persist through much of the
week ahead alongside otherwise dry and gradually warming weather.

.DISCUSSION...
As of early this morning, GOES-West satellite imagery shows some
mid to upper level clouds lingering across the central and
northern Sacramento Valley with clear skies observed elsewhere.
This will allow for another night of radiational cooling, although
with slightly higher observed dewpoints compared to last night,
low temperatures are expected to settle in the upper 30s to mid
40s across the Delta, Valley, and foothills. Given the more
uniform near surface moisture through the Valley from roughly
Chico southward, another morning of patchy to scattered fog
development will be possible. Current probabilities of dense fog
development sit around 20% to 40% for Valley locations from Chico
southward and generally along and east of Interstate 5. Currently
the only visibility obstructions as of 1 am PDT are across the
Sacramento metro and into the northern San Joaquin Valley. Be sure
to allow for extra time during your morning commute and check the
latest road conditions at quickmap.dot.ca.gov!

Any fog that does develop is expected to dissipate moving toward
the late morning period, leading to mostly clear skies through the
remainder of the day. While the upper level pattern itself
remains somewhat active as a closed low moves across SoCal through
midweek, interior NorCal is expected to remain primarily
influenced by ridging aloft. This will result in the overall
stagnant weather pattern that has been observed the last few days
continuing through the remainder of the week ahead. High
temperatures are expected to remain firmly in the 60s to low 70s
across the Delta, Valley, and foothills, as 50s to low 60s persist
at higher elevations. Light north to east winds will also
continue within this weather pattern, although some breezier east
to northeast winds gusting to 25 mph will remain possible along
the Sierra during the evening and overnight hours. While fire
weather concerns are currently not anticipated given recent
precipitation, low afternoon humidity values are also expected
throughout the foothills and mountains.


.EXTENDED DISCUSSION (Saturday THROUGH Tuesday)...
Moving into the weekend, ensemble guidance continues to indicate
a lobe of amplified ridging translating eastward, with ensembles
then showing some slightly differing solutions as a shortwave
ejects out of the Pacific Northwest late weekend into early next
week. The primary difference is in regards to the trajectory of
the ejecting trough, with some guidance keeping the shortwave
rather progressive and some guidance deepening a portion of the
trough toward the Four Corners and Great Basin. The former
solution would yield little to no impacts for the region, while
the latter solution would introduce some potential for gustier
northerly winds on Sunday and Monday. Cluster analysis currently
depicts a near even split between these solutions. Regardless,
both solutions do indicate some lowering heights aloft, which will
result in temperatures cooling by around 2 to 4 degrees moving
toward next week.

&&

.AVIATION...
Areas of MVFR/IFR with localized LIFR due to FG/BR across the
Valley from KMYV southward, gradually improving after 18Z. Light
north winds less than 12 kts expected through the Valley. Over the
Sierra mountains/foothills periodic gusts of 15-25 mph will
continue until 18Z today before redeveloping by around 03Z
Wednesday.

&&

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

$$