East Irvine, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

646
FXUS66 KSGX 300435
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
935 PM PDT Thu May 29 2025

.SYNOPSIS...
Warmer Friday with high temperatures 10-15 degrees above normal
in the valleys and 5-10 degrees above normal elsewhere. Cooler
Saturday through Tuesday, with Tuesday high temperatures as much
as 10 to 15 degrees below average for the mountains. A closed
upper level low pressure system off the coast of northern and
central Baja will draw some tropical moisture northward into the
area this weekend with periods of mostly light showers Saturday,
then a greater chance of showers and thunderstorms over the
mountains and deserts on Sunday. A warming trend will follow for
the latter half of next week.

&&

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

Areas of low clouds are developing over coastal San Diego County
this evening, while elsewhere high clouds were wrapping around the
north side of the cut-off low centered over northern Baja. Marine
layer low clouds should be much less widespread tonight as the
marine layer becomes more shallow with easterly flow developing
and upper level high pressure building to the north. The
combination of easterly flow and the building high will also
bring much warmer weather on Friday, especially for the valleys
where high temperatures will rise as much as 15-20 degrees over
today, nearing the upper 90s in the Inland Empire. The easterly
flow is not forecast to make it all the way to the coast, however,
with an afternoon sea breeze limiting the amount of warming.

Previous discussion...
For the weekend, a closed upper level low pressure system off the
coast of northern and central Baja will draw some tropical
moisture northward into the area with precipitable water values
peaking on Sunday. There is a chance of showers over the weekend
with the relatively greater chances on Sunday and over the
mountains of San Diego County. On Saturday, there is about a 45
percent of measurable precip (0.01 inch) over the San Diego
County mtns and about a 25 percent elsewhere. On Sunday those
chances rise to about 70 percent and 50 percent respectively.
Chances for precip end on Monday morning as the upper low moves
north of SoCal.

The cooling trend will continue through Tuesday with Tuesday high
temperatures as much as 10 to 15 degrees below average for the
mountains. Highs on Tuesday will range from the lower to mid 60s
near the coast to the lower to mid 70s for the Inland Empire with
the upper 80s to mid 90s for the lower deserts. This will be
followed by a warming trend for Wednesday through the end of next
week. A greater return of night and morning coastal low clouds is
expected for Sunday night into Monday morning with the low clouds
extending well inland and across much of the valleys. The deeper
marine layer will persist through Tuesday, then become gradually
shallower for the latter half of next week.

&&

.AVIATION...
300300Z...Coasts/Valleys...Low clouds currently well offshore aside
from a small patch near KSAN. Clouds will slowly develop near the
coast this evening in San Diego County, then in Orange County and
into western valleys after 09z. Eastern valleys and IE should remain
SKC through the night. Bases will lower to near 800-1500 ft MSL with
vis restriction in the valleys across higher terrain. Scattering
slightly earlier than today near 18-19Z near the coast. Low clouds
push into coastal land areas Friday evening with bases 700-1300 ft
MSL.

Other areas...FEW-SCT clouds AOA 20K ft MSL and VFR conditions into
Friday.

&&

.MARINE...
No hazardous marine conditions are expected today through Sunday.
Slight chance of showers across the area by the weekend.

&&

.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...SS/PG
AVIATION/MARINE...KW