Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 290402

902 PM PDT Thu May 28 2015

Well above normal daytime temperatures over the next few days as
high pressure slides across the west coast. Cooler early next week
with a slight chance of showers and thunderstorms over the
northern Sacramento valley and surrounding mountains as the tail
end of a Pacific trough brushes through.


A decent delta breeze continues once again tonight but slightly
weaker than last night. Marine layer is around 1400 feet deep.
Some low clouds may make it into the far western end of the delta
later tonight but no further progression inland is expected.

Tomorrow the interior will warm up again to mainly upper 80s to
mid 90s in the valley due to the ridge of high pressure over the
west coast. Isolated thunderstorms over higher terrain look
possible again but for the most part they should stay out of the
forecast area. We should continue to get delta breezes through the
weekend to help cool off the interior each night.

On Saturday the ridge will begin to shift to the east and a though
of low pressure will be off the west coast. Dry conditions should
prevail and the winds should become slightly stronger during the
day. Temperatures will likely be close to Friday`s highs.

On Sunday a trough will begin to move into the area from the west
to cool temperatures around 5 degrees or more for most locations.
The latest GFS and NAM models are keeping the inland area dry
during the daytime. Some showers look possible Sunday night along
the coastal range and northern end of the Sacramento valley. The
NAM brings possible rain chances further south than the GFS for
Sunday night.

.Extended Discussion (Monday through Thursday)

Models continue to forecast several short wave troughs through
northern portions of California late Sunday into Tuesday with the
strongest impulse late Sunday into Monday. Dynamics and moisture
look limited with main impact being synoptic cooling with
increased onshore flow. Locally gusty southwest to west winds
expected through the Delta and over higher mountain terrain. A
slight chance of showers and afternoon thunderstorms are possible
mainly over the mountains north of I-80 through Tuesday.

Weak ridging tries to move through Wednesday and Thursday but
models are a mixed bag at this point. We favored the ridge
pattern and kept the forecast dry and above average with
temperatures.    JClapp/mid crew



Upr rdg ovr the fcst area nxt 24 hrs. Mnly VFR conds for Intr
NorCal exc lcl IFR cigs poss in far W Delta in ST til 18z Fri.
Lcl SWly sfc wnd gsts to arnd 25 kts thru Delta til 14z.


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