Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 212111

Area Forecast Discussion
National Weather Service Sacramento CA
211 PM PDT Sat Apr 21 2018

Dry and warm through early next week. Chance of a few showers or
thunderstorms over the mountains by mid to late next week.

Temperatures are running a little warmer today than yesterday and
should top out in the low to mid 80s throughout the valley. A weak
dry trough will pass over the northern end of the state Sunday
morning and weak north flow will develop behind the system.
Temperatures are expected to warm a couple of degrees over todays
highs on Sunday. A ridge will stay over the area through the
middle of next week as a low pressure system deepens off the coast
and become cutoff from the jet. Temperatures will be running well
above normal in the 10 to 15 degree range through Tuesday with
the warmest day on Tuesday.

Some moisture advects northward from the southwest over the
Sierra nevada on Tuesday and may bring a few showers or even
some isolated thunderstorms...mainly near the crest.



High pressure remains over the western US Wednesday and Thursday
as a closed upper low sits over the eastern Pacific Ocean.
Daytime temperatures will remain 5-15 degrees above normal through
Thursday, and there`s a slight chance of afternoon thunderstorms
over the Sierra crest.

Friday into the weekend, uncertainty is high as models diverge
significantly on the speed and direction of the closed low
movement. Generally, the upper low and associated surface cold
front approaches the area on Friday, creating a chance for more
widespread showers and afternoon thunderstorms over the Coastal
Range and Sierra crests Friday through the weekend. Temperatures
expected to cool down to near normal by Friday as the front
passes through the area. HEC


VFR conditions at the TAF sites the next 24 hours. Winds
generally around 10 kts or less except vicinity Delta with winds
10-20 kts.


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