668
FXUS66 KSGX 292010
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
110 PM PDT Wed May 29 2024

.SYNOPSIS...
Minor day to day changes in the weather are expected through the
weekend into next week. High pressure will lift northward through
Friday and bring warmer temperatures and less wind to inland
areas. A weak trough will move over the area for the weekend,
bringing temperatures down slightly with a deeper marine layer and
breezier winds for mountains and deserts. A ridge of high pressure
is expected to strenghten over the West next week, leading to
gradual warming and continued dry weather for our region.

&&

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

The afternoon sea breeze has kicked in across SoCal with marine
layer clouds generally retreating offshore. Scattering will be
more short lived toward San Diego today, but clearer skies should
prevail for areas further north through the afternoon. A ridge of
high pressure in Mexico will drift further north, where heights
will rise through Friday. This will provide some warming for
inland areas with less low cloud coverage for the Inland Empire by
Friday morning. By Friday, temperatures will climb to around 4-8
degrees above average for inland areas. Per latest NBM, there
exists a 50-60% chance of seeing temperatures over 105 degrees
for Palm Springs and Borrego Springs, and a 40-55% chance of
seeing highs reach 90 degrees for eastern portions of the Inland
Empire. Stay safe in the heat, especially for our desert
locations, where there is a moderate risk of heat related impacts.

A weakening shortwave will move ashore over the Pacific Northwest
this weekend, subtly lowering pressure heights. West winds will
become breezy each afternoon for the mountain desert slopes into
the deserts with gusts near 25-40 MPH, along with slightly cooler
temperatures lower near 5 degrees or so overall.

Next week will warm up once again. Ensemble model clusters still
vary on where the ridge sets up, but confidence is increasing that
this ridge is expected to build across the Great Basin through the
week. This will bring near closer to the coast with above average
temperatures inland for many across our region, along with a
shallower marine layer with sunnier skies west of the mountains
and less wind for inland regions.

&&

.AVIATION...
291930Z...Coast/Valleys...Low clouds have almost entirely cleared
the coastal basin, with a some still hugging the coast of southern
San Diego County. Any clearing in this area will likely be brief and
intermittent. Low clouds will march back inland again after 01Z, but
will have slightly lower bases, around 600-1200 feet MSL and not
reaching as far inland by 12Z Thursday. Scatter out timing Thursday
morning will be similar to today, perhaps a bit earlier in spots.

Mountains/Deserts...Mostly clear today. Areas of gusty westerly
winds 30-40 knots on desert mountain slopes and locally into the
deserts after 22Z.

&&

.MARINE...
No hazardous marine conditions are expected through Sunday.
&&

.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...APR
AVIATION/MARINE...Adams