Scientific Forecaster Discussion
Area forecast discussion
National Weather Service San Diego California
923 PM PST Tuesday Dec 1 2015
Synopsis... building high pressure aloft will bring fair and warmer
weather through Thursday. Cooler Friday as a weak trough passes to
the north bringing onshore flow and a brief return of the marine
layer. Fair and warmer again over the weekend through early next
Discussion...for extreme southwestern California including Orange...
San Diego...western Riverside and southwestern San Bernardino
A quiet evening. Light offshore flow is driving another very cool
and dry evening across much of socal. The gradient across the
Great Basin is running around 10 mb this evening. Patchy frost
will be possible late tonight in the outlying and sheltered
locations in the valleys...however slightly warmer conditions will
preclude any widespread frost conditions...primarily due to slight
warm air advection due to high pressure ridging developing across the region.
A fast moving Pacific trough is still slated to pass overhead late
Thursday into Friday morning...however a lack of organized
moisture advection will keep this system mainly dry for US. There
will be some gusty onshore winds at times and cooler temperatures
for most areas by Friday. Then slightly warmer again for the
upcoming weekend due to transitory ridging moving across our
020430z...unrestricted visible and mostly sky clear through Wednesday morning.
Forecast confidence is high.
830 PM...no hazardous marine weather conditions are expected through
Thursday. A trough passing across the region will create gusty northwest
winds and an elevated northwest swell Friday into early Saturday...with
combined seas possibly reaching 10 feet in the outer waters. These
conditions would result in hazardous boating conditions for small
830 PM...high surf of 7 feet...with isolated sets near 10
feet...is possible late Friday through Saturday for exposed west-
facing beaches of San Diego County and northern Orange County
beaches as swells increase with the passage of a low pressure
trough. Elevated surf conditions will then prevail into Sunday.
The large surf will also create strong rip currents...as well as
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.