760
FXUS66 KSGX 271037
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
337 AM PDT Sat Apr 27 2024

.SYNOPSIS...
Weaker winds, brighter skies, and warmer weather is on the
horizon for the upcoming week. Many areas will be near to slightly
above average by Sunday as weak high pressure moves through the
middle of the week. A trough of low pressure will form into parts
of the Great Basin, that will provide weak offshore flow and
further warming later in the week.

&&

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

The trough that impacted our region on Friday has pushed into the
Four Corners region, leaving behind drier conditions with weaker
winds this morning. Low clouds covering much of the inland and
southern portions of the coastal basin will begin to thin out
through the morning hours. Northwest flow aloft will keep
temperatures at bay today, though a bit warmer than what we saw on
Friday where many will be near 5 degrees below average. Though the
trough axis has departed to the east, the large troughing pattern
across the southwest will continue to bring an uptick in onshore
flow. Winds across mountains and deserts will gust 25-40 MPH,
slightly higher through the San Gorgonio Pass on Saturday
afternoon and evening.

High pressure across the NE Pacific will slowly strengthen by
Sunday, influencing our weather pattern through the middle of the
week. This will shrink the marine layer, causing areas of low
clouds and patchy fog mainly near the coast and far western
valleys each night and morning. Temperatures Sunday through
Wednesday will be near to slightly above average with 70s and 80s
away from the coast with 90s appearing across the lower deserts.

Cluster analysis is not in fair agreement regarding the
positioning of a trough of low pressure by Thursday and Friday.
Depending on how strong this trough pushes south across the
intermountain west and Great Basin, will see how warm we become.
Offshore flow will push up temperatures west of the mountains
slightly, which is indicated by NBM. Long range models continue to
show various variations of our general weather pattern, much of
which looks dry into next weekend.

&&

.AVIATION...
271030Z...Coast/Valleys/Mountains...SCT-BKN020-040 with tops 6500
feet through 15Z. Mountains obscd in clouds and fog at times.
Gradual clearing from the northwest through 19Z.

Deserts...Mostly clear with gusty northwest winds 20-40 kt
decreasing this morning. Gusty desert winds of 20-30 kts returning
this afternoon.

&&

.MARINE...
A Small Craft Advisory is in effect through 11 AM today for strong
northwest winds of 20-30 kt and a short-period wind swell of 6
seconds that will produce hazardous boating conditions, especially
beyond 15 nautical miles from shore.

Winds and seas subside today. Lighter winds and seas are forecast
Sunday through Wednesday.

&&

.BEACHES...
Elevated surf from a short-period wind swell on exposed west-facing
beaches. Surf and swell will gradually subside today.


&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement until 11 AM PDT this morning for Orange
     County Coastal Areas-San Diego County Coastal Areas.

PZ...Small Craft Advisory until 7 AM PDT this morning for Coastal
     Waters from San Mateo Point to the Mexican Border and out
     to 30 nm.

     Small Craft Advisory until 11 AM PDT this morning for Waters
     from San Mateo Point to the Mexican Border Extending 30 to
     60 nm out including San Clemente Island.


&&

$$

PUBLIC...APR
AVIATION/MARINE...PG