High Surf Advisory 5, NWS San Diego, CA

534 
WHUS46 KSGX 200544
CFWSGX

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
944 PM PST SUN FEB 19 2017

CAZ043-552-200645-
/O.EXP.KSGX.SU.Y.0005.000000T0000Z-170220T0600Z/
SAN DIEGO COUNTY COASTAL AREAS-ORANGE COUNTY COASTAL AREAS-
944 PM PST SUN FEB 19 2017

...HIGH SURF ADVISORY WILL EXPIRE AT 10 PM PST THIS EVENING...

SURF WILL CONTINUE TO DIMINISH TONIGHT WITH SURF MOSTLY 3 TO 6
FEET THE REST OF TONIGHT THROUGH MONDAY.

$$

MAXWELL

Area Forecast Discussion
National Weather Service San Diego CA
836 AM PST Sun Feb 19 2017

.SYNOPSIS...
Scattered, light showers will linger along and west of the mountains
today, shifting toward the mountain slopes by afternoon as the clouds
gradually break. Light showers may linger over Orange, San
Bernardino, and northwest sections of Riverside County at times into
Tuesday as weather systems move through northern portions of the
state, but San Diego and most of Riverside Counties should be dry
and a little warmer. Breezy and cooler midweek as a trough passes
with a period of showers possible. Even cooler by next weekend with
another chance of rain and mountain snow.

&&

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

NWS radar showed scattered, light showers continuing to move east,
off the coastal waters, and inland. The bulk of the echoes were
across San Diego County, but rain gages indicate light rain is
widespread across the San Bernardino Mountain coastal slopes as
well. Based on remote rain gage data through 8:30 AM PST; the rain is
very light, with two hour totals remaining below 0.05 inch.

At 8 AM PST...Satellite imagery showed a thick cloud deck from the
mountain crests, west across the coastal waters. Skies were mostly
cloudy in the Coachella Valley where some fog was reported this
morning, but mostly clear over the San Diego and SW San Bernardino
County deserts. Surface pressure gradients were running around 4-6
MBS onshore KSAN-NV and 2-3 MBS onshore to the lower deserts. Peak
wind gusts were mostly under 20 MPH, except in wind-prone mountain
pass and canyon areas where westerly gusts were 25-35 MPH.

No changes to current forecast.

From previous discussion...

.SHORT TERM (Today through Tuesday)...
A few light showers will continue this morning...mainly along and
west of the mountains in San Diego County and in the Inland
Empire...decreasing this afternoon. In the deserts...there are
areas of low clouds and some patchy fog as well. There was a
recent spotter report of dense fog in the Borrego Springs area.

For tonight through Tuesday...precipitation from storms moving
into northern and central California will extend into portions of
Southern California at times. Light precipitation may extend into
portions of southwest California at times...mainly for areas
bordering Los Angeles County. Snow levels will be fairly
high...mostly 7000 feet for above.

&&

.LONG TERM (Wednesday through Saturday)...
A colder low pressure system moving inland through California
Wednesday night will bring strong gusty west winds in the
mountains and deserts with chances for light precipitation along
and west of the mountains. Dry and little warmer for Friday...then
a little cooler for next weekend with chances for precipitation.
The current forecast leans a little slower than the ECMWF and not
as amplified as the GFS with a low pressure system that could
bring precipitation late Saturday into Sunday.

&&

.AVIATION...
191619Z...BKN-OVC cloud decks within the 1500-7000 ft msl layer with
isolate-to-scattered light showers, areas of 3-5 sm vis, local vis 1-
2 sm, and mountain obscuration of coastal slopes will continue
through 2100 UTC, with areas of 2-4 sm vis, local vis 1/4 sm and
cigs of 500-1500 ft agl in the lower deserts likely lifting and
clearing through 1800 UTC. 2100-20/0900 UTC, showers dissipating,
with clouds becoming SCT-BKN in the 3000-6000 ft msl layer, mountain
obscuration continuing, and otherwise vis P6SM prevailing. 20/0900-
1500 UTC, SCT-BKN cloud decks within the 5000-15000 ft msl layer
developing, with mountain obscuration of higher slopes, possible
isol showers in Orange and San Bernardino counties, and otherwise
P6SM vis prevailing.

&&

.MARINE...
At 7 am, buoy observations indicated 13 foot seas in the outer
waters and 9-12 foot seas in the inner waters. A Small Craft
Advisory continues through this evening for the large combined seas.
Seas should lower below 10 feet by late this evening, if not
before that.

Another storm system may create more hazardous marine weather
conditions late Wednesday into Thursday, with northwest winds of 25-
30 kt possible and seas near or above 10 feet.

&&

.BEACHES...
Swell and surf will be high this morning with max sets around 12
feet, then lower gradually through the day. Powerful rip currents
will accompany the high surf as well. A High Surf Warning remains in
effect through this evening, although it may need to be downgraded
to an Advisory late this morning or in the early afternoon.
&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...High Surf Warning until 10 PM PST this evening for Orange County
     Coastal Areas-San Diego County Coastal Areas.

PZ...Small Craft Advisory until 10 PM PST this evening for Coastal
     Waters from San Mateo Point to the Mexican Border and out
     to 30 nm-Waters from San Mateo point to the Mexican Border
     Extending 30 to 60 nm out including San Clemente Island.

&&

PUBLIC...JAD/17
AVIATION/MARINE/BEACHES...Harrison