Balboa, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

158
FXUS66 KSGX 251617
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
917 AM PDT Wed Jun 25 2025

.SYNOPSIS...
A gradual warming trend will continue through the end of the week.
The peak of the heat is expected late in the weekend into early next
week. The marine layer will bring night and morning low clouds to
coastal areas through the rest of the week. The marine layer is
expected to become shallower, with less low cloud coverage in the
valleys by the end of the week.

&&

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

Low clouds had reached well into the coastal basin overnight and are
clearing out of the valleys as of 9 AM. Low clouds are expected to
clear to the coast by late this morning with the potential for
periods of clear skies at the beaches again this afternoon. The
marine layer is expected to decrease in depth, to 1500 to 2000
ft, Thursday into early next week. This will limit the inland
extent of night and morning low cloud coverage to the coast and
western valleys.

Highs today for inland areas are expected to be 5 to 10 degrees
warmer than Wednesday, with only a few degrees of warming near the
coast. For the end of the week into the weekend, an area of high
pressure from south of the border will build near the Four Corners
region. This will result in a more noticeable warming for the
deserts Friday through Tuesday. Temperatures on Sunday are trending
slightly cooler than the past few days with chances of exceeding 110
degrees down to 40 to 70 percent. Chances of the low deserts
exceeding 110 degrees are now highest on Monday and Tuesday at 60 to
80 percent. GFS ensemble precipitable water guidance is indicating
that the position of the high pressure would allow for a moisture
surge from the south/southeast into the low deserts over the weekend
or early next week. The ECMWF ensemble guidance is notably drier. If
the solutions with an increase precipitable water come to fruition,
that would keep high temperature readings on the lower side of
guidance. If it remains on the drier side of guidance, the hotter
solutions will occur with higher likelihood of temperatures reaching
or exceeding 110 degrees.

Conditions are also expected to warm up west of the mountains, but
an upper level weak trough lingering off the coast of Southern
California is expected to keep the aforementioned high pressure from
moving too far west. Chances of the Inland Empire exceeding 100
degrees are now highest Monday through Wednesday and still mostly 20
to 30 percent, locally up to 50 percent in the eastern portion of
the Inland Empire. For the eastern San Diego valleys, chances for
temperatures to exceed 90 degrees are 30 to 50 percent. Chances of
inland Orange County exceeding 90 degrees on Sunday and Monday are
closer to 10 to 20 percent.

&&

.AVIATION...
251605....Coast/Valleys...Widespread low clouds and patchy fog
(mostly in the Inland Empire) this morning are clearing from the
inland edges toward the coast. Bases are around 2000 ft MSL and CIG
impacts should end at TAF sites west of the mtns 17Z-19Z. A few low
clouds could linger at the beaches into the afternoon, otherwise
skies should be mostly clear. Low clouds with bases around 1500 ft
MSL will return to coastal areas after 02z Thu and spread up to 15
miles inland by 14Z Thu, with patchy clouds and fog in the Inland
Empire. CIG impacts likely at coastal TAF sites 03Z-18Z Thu. 30-40%
chance of a CIG at KONT 11Z-16Z Thu and less chances at KSBD.

.Mountains/Deserts...Clear skies with unrestricted VIS through
Thursday morning.

&&

.MARINE...
No hazardous marine conditions are expected through Sunday.

&&

.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...CO
AVIATION/MARINE...PG