Santa Ana, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

786
FXUS66 KSGX 120428
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
928 PM PDT Wed Jun 11 2025

.SYNOPSIS...
Seasonal weather will continue through into the end of the week
with a persistent marine layer. High pressure will expand over
the desert southwest by Sunday, leading to slight warming for
inland areas. A weak troughing pattern will take hold by early
next week, where highs will be closer to average. Dry weather
continues for the foreseeable future.

&&

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

This evening...The marine layer is about 1700 ft deep and already
low clouds have spread about 15 miles inland. Sfc pressure
gradients remain onshore and high resolution models show the low
clouds spreading farther inland by sunrise, with reduced
visibility in fog on the higher coastal terrain.

From previous discussion...
Minor day to day changes will occur through Saturday as high
pressure is kept to the south by a trough that persists along the
coast of the Pacific Northwest. The marine layer will maintain its
depth over the next few days with clouds overnight into the
morning across the valleys, with less clear conditions at the
coast. Patchy fog will occur mainly across the valleys and
elevated coastal terrain. NBM was used for the forecast with
highs in the 90s and lower 100s across the Inland Empire and
desert regions.

High pressure to our south will expand farther across the
southwestern part of the country by the weekend. This will lead to
warmer temperatures away from the coast, where highs will go
around 5 to 10 degrees above average. High temperatures will
likely go over 110 degrees across parts of the lower deserts by
Sunday with a 5-25% chance of highs going above 115 degrees across
the Coachella Valley. Confidence is low to moderate in seeing
temperatures approach 100 degrees across parts of the Inland
Empire as well as highs in the lower 90s for other western
valleys. Rising heights will also allow the marine layer to be
suppressed some, so chances for low clouds in the western valleys
will lower. A subtle troughing pattern will take hold by early
next week, though models do struggle a bit with how deep this will
be. The deeper the trough, the greater the cooling and deeper
marine layer. For now, the NBM forecast has been used to show a
slow cooling pattern by early next week with continued dry
weather.

&&

.AVIATION...
110300Z....Coast/Valleys...Low clouds based around 1000-1500 feet
MSL with tops to around 2000 feet will continue to move inland
throughout the evening, with bases lowering to 200-800 ft MSL and
reduced vis 0-5 SM inland, and over higher coastal terrain between
these levels. Inland areas scatter out again 16-17Z Thu, 18-20Z for
coastal areas, with only intermittent clearing along the immediate
coast again. 20% chance for KCRQ and KSAN to remain BKN-OVC through
the day Thu. These clouds will likely push back in a little earlier
tomorrow for the inland areas, and extend a little further eastward,
as bases will be slightly more elevated from where they were today,
beginning around 00Z Fri, with bases of around 1200-1800 feet MSL.
These bases will continue to lower again throughout the overnight
hours tomorrow night, although maybe not quite as low as where they
are expected to be tonight.

Mountains/Deserts...SCT high clouds and unrestricted vis expected
through tomorrow night.

&&

.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...Stewey