Scientific Forecaster Discussion
Area forecast discussion
National Weather Service San Diego California
333 am PDT Friday Mar 27 2015
high pressure aloft over California will bring another unseasonably
warm day today...though it will be a little bit cooler near the
coast due to developing onshore flow. The cooling will spread inland
over the weekend...and marine layer clouds will return to coastal
areas. High pressure will rebuild over the region Monday with some
warming...followed by slight cooling towards middle next week.
Discussion...for extreme southwestern California including Orange...
San Diego...western Riverside and southwestern San Bernardino
Well the offshore flow has become quite light to near neutral
looking at the latest observations early this morning. Coastal areas
will be a bit cooler today meanwhile inland locations will likely be
just as hot as y'day if not a few degrees warmer. The upper high
will drift east through Saturday into southern Arizona...although
temperature profile aloft will not change much. Onshore flow will bring a
welcome marine intrusion...shallow but strong marine layer through
the coastal strip Saturday morning with patchy fog...occasionally
dense along the immediate coast. Inland and desert locations will be
hot once again on Saturday with the lower deserts even a bit hotter
with the Coachella Valley likely reaching 100 degrees by Saturday.
A weak upper level trough will bring some relief to inland areas on
Sunday along with some high cloudiness across the region.
Beyond Sunday...zonal flow will continue through much of next week
with temperatures remaining slightly above normal across the
region...although coastal areas will be tempered by moderate diurnal
onshore pushes each day. The zonal flow pattern should allow
occasional periods of high clouds to pass by...otherwise little in
the way of actual sensible weather is expected at this time.
Aviation...271000z...clear skies and unrestricted visible through
28/0000z. Light diurnal winds developing during the late morning and
afternoon. Low clouds and fog with bases around 500 feet mean sea level could
return to the immediate coast after 28/1200z early Saturday morning.
This layer will likely be patchy so confidence is low to moderate of
occurrence at any given Airport along the coast.
300 am...no hazardous marine weather is expected through Monday.
300 am...a south swell is getting into the area tonight with a long
period of 17-20 seconds. This will create strong rip and longshore
currents this weekend...as well as somewhat elevated surf along
south-facing beaches. For details...see the beach hazards statement
Skywarn... Skywarn activation will not be needed.
California...beach hazards statement through Sunday afternoon for
Orange County coastal areas-San Diego County coastal areas.