Royal Oaks, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

538
FXUS66 KSGX 230535
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
935 PM PST Sat Feb 22 2025

.SYNOPSIS...
A warming trend continues for much of the week, with temperatures
reaching 10-20 degrees above normal by Wednesday when elevated
Santa Ana winds return. A pattern shift late in the week brings a
return of cooler weather and a chance of light precipitation into
next weekend.

&&

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

This evening...Sfc pressure gradients remain offshore but are
trending weaker and winds across the region are mostly less than
10-15 mph. No locations south of LA County are reporting low
clouds or fog at this time but satellite imagery shows areas of
low clouds and fog over the coastal waters. Short-range, high-
resolution models indicate a 40-60 percent chance for low clouds
and fog over the coastal areas, with the potential for visibility
less than 1 mile at times through about 9 am Sunday.

From previous discussion...
Warm weather and light winds will prevail through tomorrow as
weak upper level ridging moves in. Temperatures will slowly rise
through Monday/Tuesday with zonal flow aloft, providing afternoon
highs in the 70s along the coasts, 80s for the valleys and inland
areas, 60s and 70s for the mountains, and 80s to 90s for the
deserts.

A closed low over the PacNW will transition to an open trough and
move into the Four Corners on Wednesday, with gusty offshore
winds developing across much of the region. Despite the weak to
moderate easterly flow, elevated fire weather conditions may exist
on Wednesday as relative humidity drops to single digits
everywhere east of the valleys. This dry, warm flow will also
cause temperatures to reach almost 20 degrees above normal,
reaching the 90s for some desert areas. While temperatures peak
Wednesday, highs remain unseasonably warm into Thursday as the
trough slowly propagates southward through Arizona. Given these
unseasonably high temperatures, those outside may be caught off
guard by the heat. Make sure to practice proper heat safety,
remaining hydrated and taking frequent breaks in the shade, and
avoid outdoor work during the hottest hours of the day.

The pattern changes substantially on Friday as the prevailing hot
and dry weather comes to an end. While there remains substantial
disagreement among the models later this week, some runs continue
to indicate a chance for some precipitation as an upper level low
moves into Southern California on Friday, followed closely by a
secondary trough set to come across late weekend. The signal
remains fairly weak for precipitation with this first low, chances
slightly better with the second, but there is still good
agreement on the substantially cooler weather expected to
accompany this pattern shift. Highs may fall noticeably Friday
compared to Thursday, closer to near normal, with the cooler
weather prevailing through the weekend.

&&

.AVIATION...
230500Z...Coast...Areas of low clouds/fog, locally dense, will
gradually develop within 5-10 miles of the coast 07Z-12Z Sun with
BKN/OVC bases 200-500 ft MSL with tops to 600 ft MSL. Areas of VIS 0-
2 will occur, and there is a 50% chance of VIS below 1 mile at SAN,
60% chance at CRQ and 50% chance at SNA. Most areas will clear 14Z-
17Z Sun, except for low BKN stratus lingering at the coast through
19Z Sun. Mostly VFR conditions will prevail Sun afternoon, but low
clouds/fog, possibly dense, could return Sun night but with low
confidence on timing/location.

Valleys/Mountains/Deserts...Mostly clear skies with unrestricted VIS
will prevail through Sun evening.

&&

.MARINE...
Areas of dense fog will occur over the coastal waters overnight and
Sunday morning with visibility below 1 NM at times, locally below
1/4 NM. There is a 60% chance of fog with visibility below 1 NM
returning Sunday night and Monday morning. Otherwise, no hazardous
marine conditions are expected through Thursday.

&&

.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...Maxwell