Lemon Heights, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

656
FXUS66 KSGX 042040
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
140 PM PDT Wed Jun 4 2025

.SYNOPSIS...
Moisture over southwestern California will slowly decrease today
and Thursday, with decreasing chances for afternoon and early
evening showers and thunderstorms in the mountains and high
desert. Dry for Friday into next week, with a warming trend
through the weekend. High temperatures will peak Sunday and
Monday at a few to around 5 degrees above average for coastal
areas and 5 to 10 degrees above average for the mountains and
deserts. Night and morning coastal low clouds will cover much of
the valleys into Thursday, then not spread as far into the valleys
for the weekend into early next week as the marine layer becomes
shallower.

&&

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

This afternoon...Satellite imagery shows cumulus cloud buildups
over the local mtns but radar is yet to detect any precipitation,
except over the mtns of northern Baja. There is still time for
showers/tstms to develop this afternoon/evening in our local mtns.
Any convective activity will likely dissipate around 7 pm. The
marine layer low clouds are very slow to clear and continue to
cover the coastal areas and the western portions of the San Diego
County valleys.

From previous discussion...
The atmosphere over SoCal will steadily become drier today through
tomorrow for decreasing chances of afternoon showers/tstms as
conditions become more stable.

In spite of broad troughing over the western US through Friday with
a closed upper low developing off the CA coast on Sat, temperatures
will slowly rise through the weekend. Friday high temperatures
will be mostly within a few degrees of average, ranging from
around 70 near the coast to the 80s for the Inland Empire, with
100 to 104 for the lower deserts.

As we move into the weekend, the sub-tropical high over northern Mexico
will build over AZ and extreme southeastern CA. Slow warming will
continue through the weekend with the heat peaking on Sunday and
Monday. High temperatures for Sunday will range from a few to
around 5 degrees above average for coastal areas and 5 to 10
degrees above average for the mountains and deserts. High
temperatures on Sunday will range from the lower 70s near the
coast to the mid 80s to mid 90s for the Inland Empire, with 105
to 110 for the lower deserts. The marine layer will become
shallower with night and morning coastal low clouds not spreading
as far into the valleys.

Not unexpectedly, model solutions diverge as we move into next
week so there is measurable uncertainty in the forecast details.
In general, we will see the sub-tropical ridge expand westward but
remain to our south with weak ridging over the west coast. We can
expect dry conditions to persist through the middle of next week
with a shallower marine layer modifying temperatures near the
coast. Inland temperatures will remain mostly several degrees
above average.

&&

.AVIATION...
042030Z....Coast/Valleys...Low clouds based 1000-2000 ft MSL with
tops to 2500 ft are present along most of the coast and locally to
20 miles inland. Some clearing for inland areas and the northern
Orange County coast will continue through about 22Z, but clouds will
otherwise linger along the San Diego County coast. Low clouds will
push inland again after 00Z to fill most of the coastal basin
overnight, with bases lowering to 1000-1500 ft MSL and inland vis
reduced 3-5SM in BR. Clearing Thu morning 15-17Z for inland areas,
18-20Z for Orange County coast, and only partial clearing for San
Diego County coastal areas 19-21Z, with KCRQ and KSAN likely
remaining under cloud cover all day once again.

Mountains/Deserts...ISO SHRA/TSRA based at 10000 feet MSL possible
over the mountains and high desert through 01Z this evening. Turning
mostly clear thereafter.

&&

.MARINE...
No hazardous marine conditions are expected today through Monday.

&&

.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...PG
AVIATION/MARINE...CSP