FXUS66 KSTO 201003
AFDSTO
Area Forecast Discussion
National Weather Service Sacramento CA
203 AM PST Mon Jan 20 2025
SYNOPSIS...
Dry weather prevails with cold low temperatures and patchy morning
frost and fog. Gusty north to east winds expected on today.
.DISCUSSION
...
Some patchy fog is visible on GOES satellite imagery, and in
local observations, in portions of the southern Sacramento and
northern San Joaquin Valleys this early morning. Any lingering fog
should dissipate by mid-morning, especially as northerly winds
move in to those areas. Northerly winds are already starting to
pick up in the northern Sacramento Valley and in the Sierra,
though they aren`t expected further south until closer to mid-
morning today. The NBM currently has a 35 to 65% chance of 40 mph
gusts or higher along and west of the I-5 corridor (particularly
south of Williams), and a 40 to 70% chance of 50 mph or greater
gusts in the mountains and north- east oriented gaps and canyons
(70-95% at mountain peaks). Winds will continue throughout the day
today, slowly tapering off by early Tuesday morning.
Otherwise, calm and clear weather continues through Thursday,
with chances for patchy fog and frost continuing in the mornings.
Temperatures will be near to above normal throughout the week,
with Valley highs in the high 50s to 60s, and 40s to 50s at higher
elevations.
.EXTENDED DISCUSSION
(Friday THROUGH Monday)...
Inside slider short wave trough progged to drop into interior
NorCal Friday night into the weekend. Showers will be possible,
mainly in the northern and eastern foothills with snow showers in
the mountains during this period. Slight chance of showers in the
Central Valley Saturday. Short wave trough is also expected to
bring breezy to windy conditions with cooler temperatures. Light
snow showers possible in the foothills over the weekend as snow
levels lower.
Drier weather returns early next week as the short wave trough
pushes south of the CWA and EPAC upper ridging builds into NorCal.
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