Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 271051

Area Forecast Discussion
National Weather Service Sacramento CA
351 AM PDT Fri May 27 2022

A cooling trend through holiday weekend. Slight chance of showers
Friday evening into Monday over the Sierra, northern Sacramento
Valley and surrounding mountains. Dry and breezy conditions return
early next week.


Delta breeze has brought significant cooling to the Southern
Sacramento Valley with temperatures running about 10 degrees
cooler than yesterday at this time. A brief period of stratus
cloudiness will likely fill the Delta and Southern Sacramento
Valley this morning.

Main trough tracking through the Pacific Northwest over the
weekend will extend south over NorCal. This will bring cooler
conditions with periods of breezy onshore winds. As the the system
approaches expected scattered showers to develop over Shasta
county Friday afternoon and spread south over the northern Sierra
into Saturday. A slight chance of thunderstorms will also be
possible over Shasta county, the southern Cascades and northern
Sierra Saturday afternoon and evening. Instability appears to be
on the low side at this time, so not expecting widespread
thunderstorm activity or strong storms, but possibly some
isolated small hail. Rainfall amounts are expected to be light
with no precip in the Valley and less than 0.25 inches over the
mountains. Snow levels will remain above 8,000 feet, so not
expecting any snow at pass level or below.

Ensembles and clusters show the upper low moving into the Great
Basin Monday, as this occurs onshore gradients will reverse and
become offshore. The EFI is highlighting portions of northern
California for climatologically elevated north winds during the
Monday-Tuesday timeframe with gusts up to 30 mph. This will
likely bring fire weather concerns back to the area Monday and
Tuesday. Valley temperatures warm back into the 90s by Tuesday
next week.


High pressure building inland Tuesday will bring some gusty north
to east wind and warming temperatures. Upper ridge progress
through Wednesday as next Pacific frontal system approaches. Some
associated cloudiness and cooling expected Thursday as baroclinic
zone weakens and moves through. Secondary wave follows Friday with
a threat of showers over the Shasta mountains.



Mainly VFR conds exc areas MVFR/IFR cigs vcnty of Delta into Srn
Sac Vly til abt 18z and lcl MVFR conds poss in shwrs ovr Shasta
mtns aft 00z Fri. In Cntrl Vly, sfc wind mainly AOB 12 kts with
lcl gusts to 25 kts. Vcnty of Delta, areas SWly sfc wind gusts up
to 35 kts poss. Omtns, areas of SWly sfc wind gusts up to 45 kts



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