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Area forecast discussion 
National Weather Service Sacramento California
336 PM PDT Tuesday Aug 4 2015

Synopsis...
cooler weather with temperatures below average through
Wednesday. Slight chance of sprinkles and thunderstorms this
evening. Better chance for showers and thunderstorms Thursday into
Friday.

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Discussion...
the short-wave moving across norcal this afternoon has spread some
sprinkles across portions of our County Warning Area. Sprinkles will continue this
evening along with a slight chance of mountain thunderstorms
(mainly in the coastal range). Increasing cloud cover with this
weak system have brought much cooler weather. Current temperatures
are running about 10 degrees cooler than 24 hours ago.

The wave shifts east overnight and brief ridging will bring
warmer and drier weather Wednesday into Thursday. Another low
approaches Thursday late afternoon through Friday evening and
will bring a return of shower and thunderstorm chances along with
cooler temperatures. This low is better organized than today's short-wave
so thunderstorm chances will be more widespread across the
mountains and could also impact the valley. This storm will cause
fire weather concerns as it could help spread current wildfires or
start new fires. In addition, thunderstorm activity will
compromise the safety of anyone doing outdoor recreation.
Remember, when thunder roars...go indoors! Jbb

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Extended discussion (saturday through tuesday)

The upper trough exits on Saturday with some lingering shower and
thunderstorm activity in the mountains. Temperatures on Saturday
still expected to be below normal. By Saturday evening, much of
the lingering showers/thunderstorms will diminish and flat ridging
should develop. This will bring slightly warmer and drier
weather for early next week. Jbb

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Aviation...

Mostly VFR in valley with showers in vicinity spreading NE through
the valley this evening and isolated thunderstorms possible over
the mountains. S-SW winds 10-15kts in the valley...with peak gusts
up to 25-30 kts in the Delta. Some smoke near wildfires may limit
visibility. Noo

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Sto watches/warnings/advisories...
none.
&&

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