935
FXUS66 KSGX 062155
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
155 PM PST Wed Nov 6 2024

.SYNOPSIS...
Santa Ana winds peaked this morning but periods of strong and
gusty north to northeast winds will continue into Thursday. The
stronger gusts of 50 to 60 mph will be along and below the coastal
slopes of the mountains. Very dry and much cooler for inland
areas today followed by a gradual warming trend into the weekend,
with high temperatures over the weekend mostly a few degrees below
average. A low pressure system moving inland across California
early next week will bring cooling, stronger and gusty west winds
for the mountains and deserts, and a slight chance of showers for
Monday night. Then dry and warmer for the middle of next week.

&&

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

This afternoon...Santa Ana winds peaked this morning, with the
strongest wind gust of 79 mph at Fremont Canyon occurring around
10 am. Wind gusts of 35 to 60 mph have been reported in the windy
areas during the last hour. Strong Santa Ana winds and very low
relative humidity will continue through Thursday, although the
winds will gradually weaken.

From previous discussion...
The upper low over the Four Corners and a surface high in the
Great Basin will continue to bring us strong Santa Ana winds along
and below the coastal slopes of the mountains in Orange and San
Bernardino Counties, in the Inland Empire and in the valleys and
on the coastal mtn slopes in San Diego County through Thursday
morning. Winds will remain offshore but gradually weaken Thursday
afternoon through Friday.

Near the coast, high temperatures will be a few degrees warmer
today. It will be much cooler for inland areas, as much as 15 to
20 degrees cooler for the mountains and deserts of San Bernardino
County with high temperatures for the Apple and Lucerne Valleys
mostly in the 50s. Inland areas will warm a few degrees on
Thursday, then another 5 to 10 degrees on Friday. Temperatures
will remain slightly below average through Friday.

Inland areas will continue to warm on Saturday with high
temperatures mostly within a few degrees of average followed by
slight cooling on Sunday as onshore flow returns. This could bring
a return of marine layer low clouds and fog Sat night/Sun morning.

A low pressure system will move quickly inland through California
early next week bringing stronger onshore flow with gusty west
winds for the mountains and deserts, cooling, and a slight chance
of showers for Monday night. The NBM currently indicates about a
25 percent chance for measurable precipitation Monday
afternoon/night in the San Bernardino Mountains, with lower
probabilities at lower elevations and farther south.

Dry and warmer with weaker winds for the middle of next week as
the low pressure trough moves east.


&&

.AVIATION...
062125Z...Santa Ana wind gusts continue but will trend downward for
SNA and ONT but still gusts 20 to 30 knots, up to 35 knots for ONT.
Winds decrease to light after 12 to 14z Thursday. For SAN best
chance for light northeast winds 23 to 04z. Santa Ana winds gusts 20
knots for PSP and TRM decreasing after 03z to variable and drainage.
Areas of BLDU could reduce VIS to 5SM at times where winds are
strongest. Moderate to strong up/downdrafts in lee (west/south) of
mountains.

&&

.MARINE...
East-northeast winds gusts 20 to 30 knots this afternoon into
early Thursday morning then decreasing Thursday and becoming west at
5 knots. Areas of choppy seas. A Small Craft Advisory is in effect
this afternoon through Thursday morning. No additional hazardous
marine conditions are expected later Thursday through Sunday.

&&

.FIRE WEATHER...
Santa Ana winds peaked this morning but periods of strong and
gusty northeast to east winds will continue into Thursday. The
stronger gusts of 50 to 60 mph will be along and below the coastal
slopes of the mountains. Lowest daytime humidity will fall to
around 10 percent with recovery tonight of about 20 to 30 percent.
Much cooler for inland areas today followed by a gradual warming
trend into the weekend with high temperatures over the weekend
mostly a few degrees below average.

For Friday through the weekend, there will be weaker winds with a
gradual recovery in humidity. A low pressure system moving inland
across California early next week will bring cooling, stronger
and gusty west winds, a greater recovery in humidity, along with a
slight chance of mostly light showers Monday night.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Red Flag Warning until 11 AM PST Friday for San Bernardino
     County Mountains-Including The Mountain Top And Front
     Country Ranger Districts Of The San Bernardino National
     Forest-San Bernardino and Riverside County Valleys  -The
     Inland Empire.

     High Wind Warning until 2 PM PST Thursday for Orange County
     Inland Areas-San Bernardino County Mountains-San Bernardino
     and Riverside County Valleys-The Inland Empire-Santa Ana
     Mountains and Foothills.

     Wind Advisory until 10 AM PST Thursday for Orange County Coastal
     Areas-Riverside County Mountains-San Diego County Mountains-
     San Diego County Valleys.

     Red Flag Warning until 7 PM PST Thursday for San Diego County
     Inland Valleys.

     Red Flag Warning until 11 AM PST Friday for Riverside County
     Mountains-Including The San Jacinto Ranger District Of The
     San Bernardino National Forest-San Diego County Mountains-
     Including The Palomar And Descanso Ranger Districts of the
     Cleveland National Forest.

     Red Flag Warning until 6 PM PST Thursday for Orange County
     Coastal Areas-Orange County Inland Areas-Santa Ana
     Mountains-Including The Trabuco Ranger District of the
     Cleveland National Forest.

PZ...Small Craft Advisory until 10 AM PST Thursday for Coastal Waters
     from San Mateo Point to the Mexican Border and out to 30 nm-
     Waters from San Mateo Point to the Mexican Border Extending
     30 to 60 nm out including San Clemente Island.


&&

$$

PUBLIC/FIRE WEATHER...PG
AVIATION/MARINE...Tardy