National Weather Service Forecast Discussion
FXUS66 KSGX 261102
Area Forecast Discussion
National Weather Service San Diego CA
402 AM PDT Sun Mar 26 2017
Dry and a little warmer today under weak high pressure aloft. For
late tonight and Monday...another low pressure system will move
inland through California with cooling...stronger and gusty
southwest to west winds in the mountains and deserts...and a few
light showers possible along and west of the mountains. Gusty
north winds for late Monday night and Tuesday with warming to near
average. Warmer for Wednesday under high pressure. For Thursday
and Friday...a low pressure system moving into the southwest
states will bring cooling to near average high temperatures...with
strong gusty west winds in the mountains and deserts for
Thursday...and gusty north winds for Friday. A little warmer with
weaker winds for next Saturday.
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
.SHORT TERM (Today through Tuesday)...
Satellite imagery shows areas of low clouds early this morning in
the far inland valleys onto the lower coastal slopes of the
mountains with patchy low clouds over portions of the inner
coastal waters. Some patchy low clouds may develop over coastal
areas into this morning. High pressure aloft moving across
Southern California will bring dry weather today with high
temperatures warming to near average.
For late tonight into Monday...another low pressure system moving
inland through California will bring stronger onshore flow. This
will bring a slight chance of light showers late tonight into
Monday morning...mainly for San Diego County inland to the
mountains. The stronger onshore flow will bring stronger and gusty
southwest to west winds to the mountains and deserts for Monday
afternoon and evening with gusts along the desert slopes of the
mountains to around 55 mph. Monday will be cooler with high
temperatures around 5 degrees below average.
As the low pressure system moves into Arizona...strong gusty north
winds will develop late Monday night and continue through Tuesday
with strongest winds along the coastal slopes of the San
Bernardino County mountains with strongest gusts to around 70 mph
and gusts to around 45 mph below the Cajon Pass and near the Santa
Ana Mountains. Tuesday will be warmer and dry with high
temperatures around 5 degrees above average west of the mountains
and near average for the mountains and deserts.
.LONG TERM (Wednesday through Saturday)...
High pressure aloft will move across California Wednesday with
greater warming and weaker winds with high temperatures 5 to 10
degrees above average. A low pressure system moving into the Great
Basin from the northwest on Thursday...will move into Arizona
Friday...then move eastward next weekend. This will bring cooling
with near average high temperatures for Thursday and Friday with
slow warming for Saturday. In advance of this low pressure system
there will be stronger and gusty west winds in the mountains and
deserts for Thursday...with gusty north winds on Friday. Moisture
is limited...but a few light showers could occur over inland areas
late Thursday night into Friday.
260900Z...Coast/Valleys...SCT-BKN low clouds with bases 1700-4500 ft
MSL, will continue this morning. Expect areas of vis 1-3SM or less
where low clouds and terrain intersect. Expect clearing by 18Z this
morning. Low clouds will begin increasing in coverage again after
West to northwest winds gusting 35 to 45 mph across the mtn ridges
will produce mdt-strong up/downdrafts and LLWS over and east of
the mtns from late this afternoon through Monday.
Northwest winds will strengthen late today through Tuesday as a low
pressure system passes across the region. Gusts 25-30 kt are
possible late Monday, in addition to combined seas rising to near or
above 10 ft. This will likely result in hazardous conditions for
small craft late today through early Tuesday. Conditions improve
West-northwest swells from around 285-290 degrees will create
elevated surf of 3-6 feet today through most of next week. This will
be accompanied by an increased risk of strong rip currents through
PZ...Small Craft Advisory from 5 PM this afternoon to 8 PM PDT
Tuesday 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.