Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 292205
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
305 PM PDT Sat Apr 29 2017

.SYNOPSIS...
Dry weather through the middle of next week with temperatures
climbing to well above normal. Mountain showers possible
by the end of next week.

&&

.DISCUSSION...
Afternoon temperatures running upwards of 10 degs warmer than
24 hours ago as upper ridge axis has shifted inland over the
area. Farther north, ridging is getting squashed as Pacific
frontal system is beginning to spread inland over W WA. This
system progged to weaken as it moves through the PacNW into the
Great Basin Sunday. Little impact for our CWA apart from some high
clouds moving through. High temperatures Sunday expected to be
near to slightly warmer.

Upper ridging then amplifies Sunday night and gradually builds
inland Monday into Wednesday. AMS warms as 1000-500 mb
thicknesses and 5H heights trend up. EPAC surface high pressure
increases into Southern Oregon as thermal troughing deepens,
resulting in some breezy northerly wind again late Sunday into
Wednesday. High temperatures climb from the lower 80s tomorrow to
the upper 80s to lower 90s in the Central Valley midweek. Max
temps in the foothills and mountains will range from the upper 50s
near the Sierra crest to around 80 in portions of the foothills.

PCH

$$


.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)
Warm temperatures remain in the forecast through the end of the
week as high pressure peaks over the west coast on Wednesday. Many
areas in the valley could reach the low 90s Wednesday and remain
near 90 degrees Thursday. Low pressure breaks down the ridge in
the Pacific Thursday, approaching the region early Friday. Models
currently show this trough deepening as it hits the coast Friday,
the trough axis lingering over the western US through the weekend
as the trough continues to deepen. Temperatures forecasted to drop
10-15 degrees from Thursday to Saturday as the low pressure moves
through. Precipitation is possible Friday through the weekend,
though at this time it looks to be limited to the higher
elevations as most of the moisture associated with this system
will fall well north and south of the area. HEC

&&

.AVIATION...
VFR TAF sites next 24 hours. North winds around 10kt this
afternoon, becoming calmer after 0z. Winds shift southerly after
4z Sunday in S. Sacramento Valley and N. San Joaquin Valley, back
to northerly after 12z.

&&

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

$$



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