Bostonia, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

696
FXUS66 KSGX 101251
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
311 AM PDT Thu Apr 10 2025

.SYNOPSIS...
The heat for inland areas will peak today and Friday with high
temperatures for the mountains, deserts, and inland valleys 15 to
20 degrees above average. This will be followed by a gradual
cooling trend for Saturday into the middle of next week as high
pressure aloft weakens and onshore flow strengthens. A shallow
marine layer with low clouds and locally dense fog near the coast
will become deeper for Saturday into next week with night and
morning coastal low clouds extending into portions of the valleys
at times.

&&

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

.SHORT TERM (Today through Saturday)...
High pressure aloft will continue the warming trend through Friday
with high temperatures for the mountains, deserts, and inland
valleys 15 to 20 degrees above average. On Friday, high
temperatures will range from around 70 near the coast to the mid
80s to lower 90s for the Inland Empire with lower deserts reaching
the upper 90s to 103. The shallow marine layer will continue into
Friday with areas of low clouds and dense fog over the coastal
waters extending locally inland along the coast.

On Saturday, high pressure aloft will begin to weaken and onshore
flow strengthen. Cooling will spread inland with high temperatures
on Saturday around 4 to 8 degrees cooler than Friday. The marine
layer will begin to slowly deepen with more widespread low clouds
and fog spreading into the far western valleys for late Friday
night into Saturday morning. There will be stronger and gusty
southwest to west winds for the mountains and deserts for Saturday
afternoon and evening with isolated stronger gusts of 40 to 50
mph.

&&

.LONG TERM (Sunday through Wednesday)...
The gradual cooling trend will continue into Wednesday with
Wednesday high temperatures as much as 5 degrees below average
for the western valleys and inland coastal areas and as much as 5
degrees above average for the deserts. High temperatures on
Wednesday will range from the lower to mid 60s near the coast to
the 70s for the Inland Empire with the lower deserts in the upper
80s and lower 90s. Night and morning low clouds and fog will spread
into portions of the valleys.

&&

.AVIATION...
100930Z...Coast...Dense fog and low clouds with bases 100-300 feet
MSL and vis 0-2SM will continue along the coast and up to a few
miles inland this morning. Scatter out 15-17Z, but patchy and
intermittent fog will linger at beaches through the afternoon. An
almost identical scenario of low clouds and dense fog will develop
tonight into Friday.

Otherwise...mostly clear skies today and tonight.

&&

.MARINE...
Areas of fog with visibility 1 NM or less this morning, and again
tonight into Friday morning. Otherwise, no hazardous marine
conditions are expected through Monday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Dense Fog Advisory until 9 AM PDT this morning for Orange County
     Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE...MM