Area Forecast Discussion
Issued by NWS Los Angeles, CA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
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 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

FXUS66 KLOX 201158

Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
458 AM PDT Mon May 20 2019

.SYNOPSIS...20/243 AM.

It will be partly cloudy today with a few mountain showers. Partly
to mostly cloudy conditions will dominate this week with a slight
chance of showers over the mountains and interior valleys. Max
temperatures will remain well below normal through the period.


.SHORT TERM (TDY-WED)...20/321 AM.

Yesterdays upper low has exited the state and is now in NV. A few
showers are continuing in the NW flow around the backside of the
low. Most of the showers will end by dawn except over the north
slopes of the mtns near the Kern county line. Some low clouds have
formed in eastern Ventura county and the western San Fernando
Vly. Patchy low clouds have also formed across the Central Coast
as well. Hgts are a much blo normal 552 DM and max temps will come
in 3 to 6 degrees blo normal across the coasts...5 to 10 degrees
blo normal for the vlys and 10 to 20 degrees blo normal for the
Antelope Valley.

There will be a decent north push tonight and wind advisories may
be needed for the I-5 corridor and the SBA south coast.

Another cold upper low will move down the CA/NV border Tuesday
settle over the Las Vegas area and then spin through Wednesday.
This system will bring partly ocnl mostly cloudy skies to the area
and a chance of light showers to the mtns the interior vlys and
the Antelope through the period. Max temps will remain similar to
today`s with most non mtn sites seeing readings in the mid to
upper 60s.

.LONG TERM (THU-SUN)...20/329 AM.

Wednesday`s upper low will eject to the NE. But in a somewhat
unusual twist a pos tilted upper level trof well retrograde into
the state. This trof will last until Friday when yet another cool
upper level low will rotate out of the PAC NW into and then over
the state.

The weather will really not change skies will be generally partly
cloudy with a few periods of either mostly cloudy or mostly clear
conds. A low chc of mtn showers will persist through the period
focused on the north slopes.

Temps will not change much at all and will remain many degrees blo
normal through the period.



At 1130Z at KLAX, there was no marine layer nor an inversion, but
there was a moist layer up to 7000 feet.

Areas of low clouds with mostly MVFR to low VFR conds were affecting
coastal and valley areas of VTU and L.A. Counties, In the
foothills and mountains, and much of SLO and SBA Counties, there
were areas of LIFR to VLIFR cigs and vsbys with some local dense
fog. Expect conds to improve to VFR in most areas by late morning.
Expect fairly widespread low clouds in coastal areas tonight, with
mostly MVFR conds expected.

Gusty southwest to west winds will affect the mountains and
Antelope Valley through tonight. Gusty west to northwest winds
will affect coastal areas this afternoon and evening. There will
be some gusty northwest to north winds through and below passes
and canyons of the Santa Ynez Range tonight. Some LLWS and mdt
UDDF are expected across the region through tonight.

KLAX....Low to moderate confidence in the 12Z TAF. There
is a 30-40% chance that MVFR cigs will linger through 18Z. There
is a 30% chance that conds will remain VFR tonight.

KBUR...Low to moderate confidence in the 12Z TAF. There
is a 20-30% chance that conds will remain VFR this morning.
There is a 30% chance of MVFR cigs tonight after 08Z.


.MARINE...20/326 AM.

For the Outer Waters, seas will be at or above Small Craft
Advisory (SCA) levels through Wed night, and winds will likely
be at or above SCA levels most of the time during this period.
There is a 30% chance of gale force winds tonight in zones
PZZ673-676, and a 40-50% chance over the same areas late Tue
afternoon into Tue night. Large hazardous seas are expected
through Wednesday due to a combination of moderate period W-NW
swell and wind waves.

For the Inner Waters north of Point Conception, seas will likely
be at or above Small Craft Advisory (SCA) levels through Wed
night. Winds will likely reach SCA levels during the afternoon and
evening hours through Wed.

For the Inner Waters south of Point Conception...SCA level
conditions due to either winds or seas, or a combination of both
area likely to continue through Wed night. There is a 20% chance
of gale force winds this evening, and a 30-40% chance of gale
force winds late Tue afternoon and evening, mainly across western


.BEACHES...20/456 AM.

Large NW to W swell will generate periods of moderate to high
surf along west and northwest facing shores this week.

The largest surf will affect the Central Coast where a High Surf
Advisory is in effect through at least early Tuesday. The surf
will subside some on Tuesday but will remain close to or possibly
above advisory level, then increase again by Wednesday. It is
possible that the advisory may be extended through at least
Thursday for the Central Coast. A High Surf Advisory is also in
effect for through early Tuesday for the Ventura County beaches,
where surf of 5 to 8 feet is expected on west facing beaches.

A Beach Hazard Statement is in effect through Tuesday morning for
the Los Angeles County beaches for surf generally 4-6 feet.


CA...High Surf Advisory in effect until 3 AM PDT Tuesday for zones
      34-35. (See LAXCFWLOX).
     High Surf Advisory in effect until 9 AM PDT Tuesday for zone
      40. (See LAXCFWLOX).
     Beach Hazards Statement in effect through Tuesday morning for
      zone 41. (See LAXCFWLOX).
PZ...Small Craft Advisory in effect until 3 AM PDT Thursday for
      zones 645-650-655-670-673-676. (See LAXMWWLOX).



High surf may affect Central Coast beaches Wednesday and Thursday.



SYNOPSIS...30 is the U.S. government's official web portal to all federal, state and local government web resources and services.