Santee, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

867
FXUS66 KSGX 201608
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
908 AM PDT Sun Apr 20 2025

.SYNOPSIS...
Dry and warmer through early next week with high temperatures
near to around 5 degrees above normal inland by Monday. Gradual
cooling follows Tuesday through Saturday. Areas of night and
morning low clouds and fog continuing through next week, becoming
more widespread towards the middle of the week as the marine layer
deepens. Afternoon and evening winds will strengthen slightly
across the mountains and deserts for the latter half of the week.

&&

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

Low, marine layer clouds finally made their way inland to areas
10-15 miles from the coast earlier this morning, but are quickly
dissipating from land areas. Some wispy high clouds will start to
move in from the west mid- to late-afternoon today, but mostly
sunny skies will predominate through this evening despite them.
Expect high temperatures to be a couple of degrees (coastal areas)
to up to 10 degrees (deserts) warmer today compared to yesterday,
bringing temperatures to near to slightly above average today. The
marine cloud layer will redevelop late this evening, likely patchy
at first before becoming more widespread in the small hours of
Monday morning.

For the next week, weakly cyclonic flow will be in place aloft,
with a series of weak shortwaves bringing cooling temperatures, a
deepening marine layer, and brisker afternoon and evening breezes
(mostly to the mountains and deserts). Monday will see
temperatures similar to today, with slight cooling along the coast
and slight warming for the deserts, and stronger afternoon and
evening breezes in the mountains and deserts. Rinse and repeat
Tuesday with another degree or two drop in high temperatures for
the coasts and valleys, and degree or two rise for the mountains
and deserts. The cooling trend that started along the coast will
then spread inland for the rest of the week, with slightly to
about 10 degree below average temperatures through most of the
region by Thu-Fri. Marine layer low clouds will get progressively
deeper and further inland each night, with areas of drizzle under
the marine layer possible but with otherwise dry weather.
Afternoon and evening breezes will strengthen slightly again in
the mountains and deserts mid to late week.

Some degree of large-scale cyclonic flow continues to be likely
for the first part of the weekend, meaning cooler temperatures
would continue, with global ensemble members split on when a low
pressure system will move into (and out of) the Great Basin. The
earlier/faster tracking models indicate ridging (and warming)
starting Sunday, with better agreement in at least a weak ridge
with warmer temperatures locally by early the next week.


&&

.AVIATION...
201600Z....Coasts/Valleys...Low clouds 500-1000 ft MSL currently
within 10 miles of the coast. Low clouds should clear to the beaches
by 17Z, with the potential for local patches of low clouds to linger
into the afternoon. Low clouds are expected to be more widespread
tonight, returning to coastal areas and spreading into the western
valleys 02-06Z Mon. Bases likely 700-1200 ft MSL. Low clouds
expected to clear to the beaches 16-18Z Mon.

Mountains/Deserts...Clear skies with unrestricted VIS prevailing
through Monday morning.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

PUBLIC...CSP
AVIATION/MARINE...CO