Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 281000
Area Forecast Discussion
National Weather Service Sacramento CA
300 AM PDT Fri Apr 28 2017
Dry weather into next week with warming temperatures. Breezy to
windy north winds today for the Valley and tonight for the
Dry northwest flow over the area will become northerly during the
day as the area is located between an upper low dropping
southward over the Rocky Mountains into the 4 Corners area. The
surface pressure gradient will tighten during the day, with winds
increasing late morning into the afternoon. The strongest winds
are expected over the northern San Joaquin Valley, with northwest
winds 15 to 30 mph gusting to 40 to 45 mph in the afternoon. The
surface pressure gradient will relax through the evening. A Wind
Advisory is in effect from 11 am until 8 pm this evening. Breezy
winds are expected into the southern Sacramento Valley, but are
expected to remain below Advisory criteria, with gusts to around
30 to 35 mph.
Temperatures this afternoon are expected to be similar to a few
degrees higher than yesterday. Temperatures trend higher Saturday
and Sunday as the upper level ridging develops. Valley/Delta highs
Saturday around 80 expected, with low 80s by Sunday. By Monday,
mid 80s are forecast. While above normal, these temperatures are
expected to remain well below record levels. EK
.EXTENDED DISCUSSION (Tuesday THROUGH Friday)
Temperatures continue to warm Tuesday and Wednesday as an upper
level ridge slides across the west coast. Daytime highs Wednesday
are forecast to reach from 10 to 15 degrees above normal. Surface
and upper level gradients indicate breezy north winds through
Tuesday night. Surface gradient and only moderate upper level
support should keep winds from becoming significantly strong. Upper
ridge axis shifts inland on Wednesday which should bring
decreasing winds. Upper ridge continues to shift eastward on
Thursday as a weak upper trough moves into the Pacific Northwest.
Onshore flow will bring a little cooling although daytime highs
will still be well above normal. GFS and GEM painting some
precipitation over the far north state Thursday afternoon.
Although dynamics over Norcal are weak, can not rule out a slight
threat of light showers over Shasta county in the afternoon and
evening hours. Weak upper trough continues to dig in over the west
coast Friday bringing just a slight drop in temperatures.
Northeast California remains east of the trough axis so a slight
threat of showers remains in the forecast for the higher
elevations of Shasta, Plumas and Lassen counties.
Elsewhere...skies will remain generally fair for the end of next
VFR TAF sites next 24 hours. North winds increasing today with gusts
20 to 30 mph Sacramento valley and 30 to 40 mph northern San
Joaquin valley. Winds decreasing slowly after 03z this evening.
Wind Advisory from 11 AM this morning to 8 PM PDT this evening
for Northern San Joaquin Valley.