Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 292219

319 PM PDT Tue Jul 29 2014

Moisture surge will bring a few sprinkles and thunderstorms to
portions of interior NorCal through mid-week. Hot afternoon temperatures
this week with a delta breeze each day bringing decent cooling at
night for the valley.


Northern California remains in southwesterly flow aloft between the
massive Four Corners ridge and an approaching Gulf of Alaska
trough. Some sprinkles fell early this morning when a weak vort
pulse combined with mid to upper level monsoonal moisture but no
further vorticity pulses are expected over the next 24-hours.
Monsoonal moisture continues to rotate clockwise over the Sierra
Nevada this afternoon. Orographic forcing over the Sierra will
result in another round of isolated thunderstorms over and east of
the crest. Most activity will remain east of the crest as a result
of upper level steering winds. Water vapor imagery shows a
secondary monsoonal surge over central/southern California this
afternoon. This moisture will rotate into northern California by
tomorrow afternoon and spawn additional isolated monsoonal
thunderstorms over and east of the Sierra Nevada crest.

The overall pattern will remain fairly consistent through the end
of the week as the dominate Four Corners high pressure remains
quasistationary. Temperatures will remain hot throughout the
region with only slight differences day to day due to the strength
of onshore flow and the extent of cloud cover.


.Extended Discussion (Saturday through Tuesday)

Upper level ridging shifts eastward for the end of the week with
slight cooling. Monsoonal moisture will be decreasing with south
to southwest flow aloft keeping most of the thunderstorm and
shower activity along and mainly east of the crest through the
weekend. Weak wave moving through Saturday and Sunday still not
looking very impressive and weather should be mainly dry into
early next week with no significant changes. EK



Mainly VFR next 24 hours. Winds gusting up to 20 kt for the Valley
through 06z then becoming light. Delta breeze around 15-20 kts with
gusts to 30 kt until around 12z then decreasing. Isolated
thunderstorms developing along and east of the Sierra crest
through around 06z. EK


.STO Watches/Warnings/Advisories...

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