Tecate, California Weather Forecast Discussion

912
FXUS66 KSGX 191019
AFDSGX
Area Forecast Discussion
National Weather Service San Diego CA
319 AM PDT Fri Sep 19 2025
.SYNOPSIS...
Southwest flow aloft will bring drying of tropical moisture
through Saturday with warming of high temperatures to within a few
degrees of average and a noticeable decrease in humidity for
inland areas on Saturday. For Sunday through Wednesday, low
pressure to the northwest and high pressure to the southeast may
direct tropical moisture into the vicinity of southwestern
California at times with chances of measurable rainfall for Sunday
and Monday of 30 to 40 percent from showers and for Tuesday and
Wednesday of 10 to 30 percent from showers along with a slight
chance of afternoon thunderstorms.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
.SHORT TERM (Today through Sunday)...
Southwest flow aloft will bring drying of tropical moisture for
today and Saturdayday. There remains a 20 percent chance of
measurable rainfall for this afternoon for the mountains of San
Bernardino and Riverside Counties northward into the high desert
from isolated showers or thunderstorms with peak hourly rainfall
of one-quarter inch or less. High temperatures for inland areas
will warm, but still be a few degrees below average on Saturday.
It should be noticeably less humid for inland areas on Saturday.
By late Saturday night and Sunday, low pressure to the northwest
and high pressure to the southeast could begin to direct mid and
high level tropical moisture into southwestern California with
increasing clouds and a slight chance of showers. High
temperatures on Sunday will be around 5 degrees cooler than
Saturday with high temperatures ranging from the lower to mid 70s
near the coast to the lower to mid 80s for the Inland Empire with
the lower 90s for the lower deserts.
&&
.LONG TERM (Monday through Thursday)...
Low pressure to the northwest and high pressure to the southeast
will continue to direct tropical moisture into the vicinity of
southwest California at times with more clouds, with chances for
showers at times along with a slight chance of afternoon
thunderstorms. There is increasing spread in the details by
Tuesday and Wednesday.
&&
.AVIATION...
190900Z...Coast/Valleys...FEW low clouds around 1200-1800ft MSL
will increase in coverage overnight; BKN cigs possible up to 20
miles inland generally after 11z and clearing by 16-17z. Areas of
low clouds return to coastal areas after 02Z Saturday, primarily
in San Diego County, though eventually into Orange County.
Slightly lower bases and less inland extent than tonight. Minor
vis reductions possible along higher coastal terrain.
Mountains/Deserts...SCT-BKN mid level clouds based 5000-10000 ft
MSL lingering through early this morning may reduce vis along
higher terrain. Generally VFR conditions expected after 12Z.
&&
.MARINE...No hazardous marine conditions are expected through
Tuesday morning.
&&
.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...17
AVIATION/MARINE...Westerink

NWS SGX Office Area Forecast Discussion