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Area Forecast Discussion (AFD)

Issued by San Diego, CA (SGX)

                            
000
FXUS66 KSGX 251007
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
307 AM PDT Mon Mar 25 2019

.SYNOPSIS...
Today will be dry and warmer. Warming will continue for the
deserts into Tuesday as cooling begins to spread inland from the
coast on Tuesday and Wednesday as a trough of low pressure moves
toward the West Coast. As that trough of low pressure moves inland
to the north, it will bring a slight chance for light
precipitation for late Wednesday night and early Thursday. It will
also bring stronger onshore flow with periods of stronger and
gusty southwest to west winds in the mountains and deserts for
late Wednesday into early Thursday. It will be dry with a warming
trend for Friday through Sunday.

&&

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

.SHORT TERM (Today through Wednesday)...
Early this morning, high pressure aloft is centered over the Great
Basin with a large closed low pressure system off the West Coast. 
Satellite imagery shows very patchy stratus over the coastal
waters and adjacent portions of the San Diego County coast. The
warming on Sunday will continue today and continue into Tuesday
for the deserts. Strengthening onshore flow will begin to spread
cooling inland on Tuesday and Wednesday as the low pressure system
off the West Coast moves very slowly eastward. It will also bring
increasing high clouds across southern California on Tuesday and
Wednesday.

&&

.LONG TERM (Wednesday night through Sunday)...
As that low pressure system moves inland to the north, it will
bring a slight chance of light precipitation along and west of the
mountains for late Wednesday night into early Thursday. It will
also bring stronger onshore flow for late Wednesday into early
Thursday with periods of stronger and gusty southwest to west
winds for the mountains and deserts with the stronger gusts to
around 50 mph.

As that low pressure system weakens and moves inland, high 
pressure aloft will develop off the West Coast on Friday, 
strengthen and move to near the West Coast on Saturday, then begin
to move inland on Sunday. For southern California, this will 
bring dry weather with a warming trend. This warming would push 
high temperatures to 10 to 15 degrees above average on Sunday for 
inland areas and 5 to 10 degrees above average near the coast. The
warming with the GFS is a little greater than with the ECMWF.

&&

.AVIATION... 250900Z...Coast...Patchy and intermittent low clouds 
1000 feet msl through 15Z this morning. Local and brief vis 3-5 SM 
on higher coastal terrain. Patchy low clouds to redevelop after 05Z 
tonight. Otherwise, mostly clear skies today and tonight. 

&&

.MARINE...
No hazardous marine weather is expected through Friday.

&&

.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...Martin
AVIATION/MARINE...MM