680
FXUS66 KSGX 141035
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
335 AM PDT Fri Jun 14 2024

.SYNOPSIS...
Today and Saturday will continue to warm with the heat peaking on
Saturday. It will be several degrees cooler for Sunday and Monday
with below average high temperatures on Monday by as much as 10
degrees. Warming will begin on Tuesday and continue through much
of the week with Friday high temperatures around 10 degrees above
average for inland areas, as high as 116 in the lower deserts and
105 in the Inland Empire. Night and morning coastal low clouds
will continue to spread into portions of the valleys late each
night. There will be stronger and gusty southwest to west winds
for the mountains and deserts for this weekend during the late
afternoon through late evening each day with isolated gusts to
around 50 mph.

&&

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

.SHORT TERM (Today through Sunday)...
Inland areas will warm several degrees today and a few more on
Saturday with the peak of the heat for most areas on Saturday with
high temperatures for the hottest locations in the lower deserts
around 115 and in the Inland Empire around 100. Sunday will be 5
to 10 degrees cooler as a low pressure system moving inland
through the Pacific Northwest strengthens the onshore flow across
southern California.

Night and morning coastal low clouds won`t spread as far into the
valleys for tonight into Saturday morning as the marine layer
becomes a little shallower. Coastal low clouds will spread farther
into the valleys for Sunday and Monday mornings as the marine
layer deepens.

There will be stronger and gusty southwest to west winds for the
mountains and deserts each late afternoon through late evening for
the weekend with gusts to 30 to 40 mph with isolated gusts to
around 50 mph in the northern Coachella Valley below the San
Gorgonio Pass.

&&

.LONG TERM (Monday through Thursday)...
High temperatures on Monday will be another few degrees cooler
than Sunday at lower elevations to around 5 degrees cooler for the
mountains. High temperatures for the lower deserts will be around
100, a few degrees below average. Warming will begin for the coast
to the mountains on Tuesday and continue through Friday for all
areas. NBM high temperatures for inland areas on Friday would be
around 10 degrees above average with high temperatures for the
lower deserts of 112 to 116, 102 to 108 for the Apple and Lucerne
Valleys, and in the mid 90s to 105 for the Inland Empire. Next
Friday could be the beginning of a longer duration heat wave for
inland areas continuing into the following week.

&&

.AVIATION...
140900Z...Coast/Valleys...Low clouds based around 1000-1500 ft MSL
and tops around 1800 ft MSL continue to fill in over the coastal
basin. Bases could briefly go lower overnight but will likely remain
at or abv 1000 ft MSL. Low clouds will likely spread up to 20 miles
inland by 13Z, obscuring higher terrain with VIS restrictions where
clouds and terrain intersect. CIGs and reduced VIS now look fairly
likely (60% chance) to impact KONT after 10Z. Meanwhile, there is a
20-30% chance of CIG and VIS impacts at KSBD. Expect inland clearing
15Z-18Z and clearing at the coast 18Z-20Z. Expect later development
of low clouds Friday night, generally after 06z Sat. Low confidence
on exactly when low clouds would redevelop, but bases would be lower
than tonight, generally around or below 1000 FT MSL.

Mountains/Deserts...SKC with unrestricted VIS. Gusty W-NW winds
picking up after 20z Fri, with peak surface wind gusts of 25-35
knots expected. MOD UDDFS expected over and east of the mountains.

&&

.MARINE...
Northwest winds may gust to around 20 knots at times in the far
outer waters near San Clemente Island each afternoon and evening
Saturday through Monday. No other hazardous marine conditions
expected.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory from noon to 8 PM PDT Saturday for San Bernardino
     and Riverside County Valleys-The Inland Empire.

     Excessive Heat Warning from 10 AM this morning to 8 PM PDT
     Saturday for Coachella Valley-San Diego County Deserts-San
     Gorgonio Pass Near Banning.

PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE...Adams