Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA

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FXUS66 KMTR 241035

Area Forecast Discussion
National Weather Service San Francisco Bay Area
335 AM PDT TUE MAY 24 2016

.SYNOPSIS...A weak low pressure system will bring a slight chance
of showers and a thunderstorm or two to our region today.
Temperatures will be seasonably cool, but gradually warm later in
the week.


.DISCUSSION...AS OF 3:30 AM PDT Tuesday...Widespread clouds this
morning across most of our CWA with a onshore west-to-east
gradient of 1.5 MB. Synoptically, a longwave trof extending from
Central Canada remains across our entire region. Similar to
yesterday a weak impulse will move through our cwa today and
likely trigger a few showers. Lifted values are forecast to drop
to below zero values over parts of the North Bay plus eastern
sections of the CWA, therefore still looks like a slight chance of
thunderstorms. The pattern also favors small hail with any of the
cells. The trof will start to progress to the east by Wednesday
afternoon which will effectively bring an end of precipitation.

Our string of cooler than normal conditions will continue through
at least Wednesday with many spots in the 60s to lower 70s. As a
ridge starts to build back starting on Thursday, temperatures will
warm back closer to normal values. That trend will continue into
weekend with the range in the mid 60s to the upper 70s. A few
lower 80s cannot be ruled out for far southern and eastern

Longer range outlook favors warmer than normal conditions next
week with mostly dry conditions.

.AVIATION...As of 10:36 PM PDT Monday...Low clouds continue to
fill in quickly over the area this evening. Expect patchy drizzle
or sprinkles overnight into Tuesday morning. MVFR cigs with areas
IFR cigs tonight then gradual clearing Tuesday. Isolated -SHRA
possible in the area due to lingering instability Tuesday.

Vicinity of KSFO...MVFR cig tonight clearing by late Tuesday

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...IFR cigs and light westerly winds tonight.
Cigs improving to MVFR by late Tuesday morning. MVFR cigs likely
returning Tuesday evening.

&& of 3:30 AM PDT Tuesday...Low pressure will persist
over the region through midweek and result in moderate northwest
winds...especially over the northern outer waters. High pressure
builds over the coastal waters later in the week to bring
increasing northwesterly winds and building fresh seas.






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