Area forecast discussion
National Weather Service San Francisco Bay area
1051 PM PDT Tuesday Jun 18 2013
Discussion...as of 9:00 PM PDT Tuesday...an upper level low is
centered just off the Washington and Oregon coasts. A cooler
airmass over the area caused temperatures to drop another 5-10
degrees from yesterday over the interior and 2-4 degrees along
the coast. The marine layer is not identifiable on the feet Ord
profiler or the Oak sounding as the airmass has really cooled
aloft. Therefore the stratus will only be areal in coverage
overnight.
The upper low will move inland late tonight but the upper low
will remain over the Pacific northwest through Friday. An upper
level ridge will build off the California coast Thursday but
warming will be very gradual due to the proximity of the upper
low. Temperatures are only expected to get as high as the lower
90s over the warmest interior locations Friday but should warm
into the middle 90s Saturday as the upper low moves further east.
Cooling is expected Sunday and Monday as another upper level
trough moves through the Pacific northwest.
Long range models build a strong upper level ridge over The Four
Corners area next Tuesday and Wednesday which could bring
significant warming to the inland areas.
Summer solstice will occur at 5:04z on June 21...which is at
10:04 PM PDT Thursday June 20.
&&
Aviation...as of 10:50 PM PDT Tuesday...an upper trough currently
swinging through the region has mixed out the marine layer
resulting in patchy low clouds scattered across the region. Stratus
will return late and will be patchy in nature resulting in an
early burn off similar to this morning. A strong onshore gradient
from sfo-SAC will gradually diminish overnight leading to lighter
winds across the district.
Vicinity of ksfo...borderline IFR/MVFR ceilings expected tonight with
an early clearing anticipated Wednesday morning. A strong onshore
gradient will maintain gusty west wind around 20 knots with gusts to
30 knots through late tonight then gradually ease overnight.
Ksfo bridge approach...patchy broken ceilings around 1000 feet are
expected to form tonight with an early clearing Wednesday morning.
Gusty winds will ease overnight.
Monterey Bay area terminals...IFR ceilings are expected overnight over
kmry with an early clearing anticipated Wednesday morning.
&&
Mtr watches/warnings/advisories...
... Arena to pt Reyes 0-10 nm from noon
Small Craft Advisory...pt Reyes to Pigeon pt 0-10 nm from noon
Small Craft Advisory...Pigeon pt to pt pinos 0-10 nm from noon
Small Craft Advisory...pt Arena to Pigeon pt 10-60 nm from 3 PM
Small Craft Advisory...pt pinos to pt Piedras Blancas 0-10 nm
Small Craft Advisory...Pigeon pt to pt Piedras Blancas 10-60 nm
Small Craft Advisory...sf Bay from noon
Small Craft Advisory...mry Bay from noon
&&
$$
Public forecast: west pi
aviation/marine: CW
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