Johnson Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

315
FXUS66 KSGX 030351
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
851 PM PDT Wed Jul 2 2025

.SYNOPSIS...
Tranquil weather will continue into the holiday weekend with minor
day to day changes. A ridge of high pressure is expected to move
into the area by the first half of next week, prompting a warming
trend over the region with increased HeatRisk.

&&

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

At 8:30 PM, low clouds were becoming more widespread along the
coast. Low clouds are expected to continue to push inland
overnight, reaching into the western valleys. Highs Thursday are
expected to be similar to today`s or a couple degrees cooler. The
additional cooling will result in temperatures 5 to 8 degrees
below average for the valleys and mountains.

From previous discussion issued at 2 PM July 2, 2025...

A series of weak troughs from the north and west will move across
our area, keeping the weather pattern benign with highs near normal.
For Independence Day itself, highs will in the low 70s to lower 90s
west of the mountains, 70s/80s in the mountains, 90s in the high
desert and near 105-110 across the lower deserts. Similar
temperatures can be expected each day through the weekend.

Models are very good agreement on a ridge high pressure moving into
our region by early next week. This will lead to a shallower marine
layer with low clouds staying near the coast, along with warmer
temperatures. Warmest temperatures will occur around the middle of
next week, with increasing chances for highs in the triple digits
across the Inland Empire and temperatures nearing 115 degrees across
the lower deserts. Model trends show a subtle increase in moisture
(PWAT) into the middle of the week. NBM chances for any storm
activity are below 10 percent by Tuesday and Wednesday, though
cumulus clouds may at least form over our higher terrain. Confidence
continues to remain low on any storm activity at this time, but we
will continue to refine this forecast in the coming days.

&&

.AVIATION...
030300Z....Coast/Valleys...Low clouds based 1000-1500 have developed
along the immediate coast and will continue to push inland again
this evening to about 20 miles inland overnight. 30-40% chance for
clouds to move into parts of the western Inland Empire, including
KONT, after 11Z. VIS down to 2-3SM for coastal terrain and valleys.
Clearing to the coast 16-18Z Thursday. Low clouds at 900-1200 ft MSL
to push inland again after 02Z Fri.

Mountains/Deserts...Mostly clear with unrestricted VIS through
Thursday.

&&

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

&&

.BEACHES...
Building southerly swell (190 degrees) of 3 feet at 14-17 seconds
will generate elevated surf of 3-5 ft with sets to 6 ft along
southerly facing beaches Thu-Sat. In addition, strong rip and
longshore currents expected at all beaches Friday and Saturday. A
Beach Hazards Statement is in effect and contains more information.
Swell and surf will begin to lower on Sunday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement from Thursday morning through Saturday
     evening for Orange County Coastal Areas-San Diego County
     Coastal Areas.

PZ...None.

&&

$$

PUBLIC...CO/APR
AVIATION/MARINE/BEACHES...CSP