Area Forecast Discussion
Issued by NWS San Diego, CA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
000
FXUS66 KSGX 271034
AFDSGX

AREA FORECAST DISCUSSION
National Weather Service San Diego CA
334 AM PDT FRI MAY 27 2016

.SYNOPSIS...
A weak trough of low pressure extending southwestward from
Southern California will move into Southern California and
strengthen slightly during the weekend...then moves east on
Monday with high pressure aloft strengthening over California next
week. Seasonal weather will continue through the weekend for
coastal areas. Mid level moisture will bring some clouds to the
mountains this afternoon...a slight chance of showers Saturday
afternoon...and a slight chance of thunderstorms Sunday afternoon.
Warming to near average for inland areas on Monday and above
average except near the coast for the rest of next week. The
marine layer and onshore flow will continue the seasonal areas of
night and morning coastal low clouds and patchy fog.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

.SHORT TERM (Today through Sunday)...
A weak trough of low pressure extending southwestward from
Southern California will strengthen slightly and move into
Southern California during the weekend. Areas of night and morning
low clouds and patchy fog will continue through the
weekend...extending inland into the far inland valleys or lower
coastal mountain slopes. High temperatures will remain a little
below average for inland areas. Mid level moisture will bring some
clouds to the mountains this afternoon. The instability will
increase slightly each of the following two days with a slight
chance of showers near the mountains on Saturday afternoon and a
slight chance of thunderstorms near the mountains Sunday
afternoon.


&&

.LONG TERM (Monday through Thursday)...
A weak trough of low pressure will move inland on Monday with high
pressure aloft strengthening over California through Thursday.
High temperatures will warm to near average on Monday for inland
areas...then warm to above average for the rest of the week except
near the coast. Weak onshore flow and the marine layer will
continue night and morning coastal low clouds and fog. The low
clouds will extend into the far inland valleys early in the
week...then not as far into the valleys the latter half of the
week as the marine layer decreases in depth.

&&

.AVIATION...
270900Z...Coast/Valleys...A coastal eddy has formed overnight and is
helping to deepen and expand the stratus deck across all of san
diego county and up to 30 sm inland, and rapidly developing in
orange county as well. Expect the stratus to impact the coast and
much of the valleys to portions of the coastal slopes through
sunrise. Burn off by mid-morning inland, retreating to the coast by
18-19z. Bases 1500-2500 ft msl and tops 4000-4500 ft msl. Reduced
vis to 1-3 sm possible where terrain and clouds intersect, obscuring
high terrain. Confidence is high in extent and coverage. Coastal
stratus likely to reform tonight aft 02z near the coast and build 10-
20 sm inland overnight. Bases lower than recent days, likely 1200-
2000 ft msl. Confidence is timing and extent of low cloud coverage
moderate for tonight.

Mountains/Deserts...West winds with gusts to 35 knots at times will
produce weak to moderate up/down drafts over and East of the
mountains through this evening.

&&

.MARINE...
200 am...Wind gusts near 20 knots late this afternoon and this
evening over the outer waters. Otherwise, no hazardous marine
conditions are expected through Mon.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX Watches/Warnings/Advisories...
CA...None.
PZ...None.
&&

$$

PUBLIC...17
AVIATION/MARINE...JMB



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.