757 
FXUS66 KLOX 172059
AFDLOX

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA 
159 PM PDT Wed Apr 17 2019

.SYNOPSIS...17/125 PM.

Dry, sunny, and warm conditions are expected for the rest of the 
week. By the weekend, coastal low clouds and fog will move 
onshore cooling the area back down to normal temperatures. Expect 
another warming trend to start next week.

&&

.SHORT TERM (TDY-SAT)...17/153 PM.

Couple of warm days coming up as gradients turn lightly offshore.
Not enough for any significant winds but there will be some light
northeast breezes in some areas. The warmest day for most coastal
areas will be Thu as an earlier sea breeze is expected Friday
which will cool temps a couple degrees there (though still a few
degrees above normal). Inland areas will see another degree or two
of warming Friday. 

A couple of troughs coming in late Friday and Saturday will bring
an abrupt halt to the warm days and begin a rapid cool down
Saturday as highs drop 10-20 degrees from their Thu/Fri levels.
We'll likely see low clouds rapidly developing Friday night and
pushing onshore and into the valleys by early Saturday morning.
Models have been consistent showing the LAX-DAG gradient
increasing to a robust 9mb Saturday afternoon so we may see some
advisory level southwest winds in the Antelope Valley and also
slow marine layer clearing for coast/valleys. 

Some gusty northwest winds expected along the Central Coast and
southern SB County Saturday evening. This along with the cooler
air aloft with the trough should help clear out the marine layer
across SLO/SB Counties.

.LONG TERM (SUN-WED)...17/158 PM.

The last trough moves through Sunday afternoon with minimal
impact. Temps expected to be a couple degrees warmer for
coast/valleys with earlier marine layer clearing and increasing 
northwest flow generating some downslope flow to the lee of the
mountains.

A ridge pushing into the west coast early next week along with
weakening onshore flow will bring about our next warming trend
with temps jumping back up into the 80s for some coastal areas 
and even some lower 90s for the valleys by Tuesday and Wednesday.

&&

.AVIATION...17/1805Z.

At 18Z, there was no marine layer or inversion at KLAX.

VFR conds are expected thru the period.

KLAX...High confidence in the 18Z TAF with VFR conds thru the pd.

KBUR...High confidence in the 18Z TAF with VFR conds thru the pd.

&&

.MARINE...17/1139 AM.

For the outer waters, high confidence in forecast. SCA level NW 
winds and seas will likely continue thru this evening. Conds are 
expected to be below SCA levels late tonight thru Fri morning, 
then SCA conds are likely Fri afternoon or evening thru Sun. There
is a 30% chance of gale force winds Sat afternoon and evening. 

For the inner waters N of Pt Sal, moderate confidence in forecast.
There is a 20-30% chance of SCA level winds this afternoon and 
evening. Conds will likely be below SCA levels late tonight thru 
Fri morning. There is a 30% chance of SCA level NW winds Fri 
afternoon/night, then SCA conds are likely Sat thru Sun. 

For the inner waters S of Pt. Conception, fairly high confidence 
in forceast. SCA conds are not expected thru early Sat, then are 
likely Sat afternoon/night, possibly continuing into Sun.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...Small Craft Advisory in effect until 9 PM PDT this evening
      for zones 670-673-676. (See LAXMWWLOX).

&&

.HAZARD POTENTIAL OUTLOOK (SAT-WED).

No significant hazards expected.

&&

$$

PUBLIC...MW
AVIATION...Sweet/DB
MARINE...Sweet
SYNOPSIS...Phillips

weather.gov/losangeles