Scientific Forecaster Discussion
Area forecast discussion
National Weather Service San Diego California
435 am PDT Tuesday Sep 2 2014
a low pressure system moving inland to the north will bring slightly
cooler weather through Wednesday along with a slightly deeper marine
layer and gusty west winds for the mountains and deserts during the
late afternoon through late evening. This will be followed by
warming for Thursday through next weekend as high pressure to the
east expands westward. Cooling is expected early next week as a low
pressure system develops near the California coast bringing stronger
Discussion...for extreme southwestern California including Orange...
San Diego...western Riverside and southwestern San Bernardino
Short term (today through thursday)...
a trough of low pressure moving inland to the north will bring slow
cooling through Wednesday...a slightly deeper marine layer...and
gusty west winds in the mountains and deserts each late afternoon
through late evening. Higher resolution models continue the coastal
eddy into Wednesday morning with night and morning coastal low
clouds and patchy fog extending into portions of the inland valleys
during the late night and early morning hours into Wednesday.
Slightly warmer for Thursday with coastal low clouds not spreading
quite as far inland for Wednesday night into Thursday morning.
Long term (friday through monday)...
high pressure to the east will expand westward bringing a warming
trend through the weekend. A trough of low pressure will develop
along the California coast bringing cooling for early next week with
dry southwest flow aloft. There is still the potential a tropical
system to develop and move to a position off the southwest Baja California
coast Friday...then move more to the west over progressively cooler
waters. There is still some potential for some of this moisture to
get drawn northward into far Southern California ahead of the trough
of low pressure developing near the California coast. Given the
large uncertainties...the current forecast remains dry with highest
probability of precipitation on Sunday and Monday.
020920z...coast/valleys...low clouds are blanketing coastal areas
and areas inland up to 30 miles this morning...with ceiling ranging
between 1300 and 1800 feet mean sea level. Across the inland valleys of San
Diego County...fog is starting to form...with LIFR visibilities
possible where the clouds meet the terrain...especially near krnm.
Expect some patchy IFR visibilities in the inland Empire by
12z...including at kont. Low clouds will clear back to the coast
between 15z and 18z. VFR conditions will prevail today...with just
few to scattered low clouds over the coastal waters...spreading inland
once again after 03z.
Mountains/deserts...VFR conditions prevailing through the next 24
220 am...no hazardous marine weather expected through Friday evening.
spotter activation will not be needed today.