Lemon Grove, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

874
FXUS66 KSGX 090402
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
902 PM PDT Sun Jun 8 2025

.SYNOPSIS...
A warming trend continues through midweek, peaking Tuesday and
Wednesday for inland and desert areas, before a very slight
cooldown towards the end of the week. Above normal temperatures
may return by next weekend. The marine layer becomes shallower
through mid week with night and morning low clouds for the coastal
areas and western portions of the inland valleys.

&&

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

This evening...The marine layer is about 1500 ft deep, several
hundred feet shallower than at this time yesterday. At this hour,
low clouds cover the coastal areas of San Diego County and
southern Orange county as well as portions of the San Diego County
valleys. The shallowness of the marine layer will inhibit its
ability to extend as far inland tonight as the last several
nights. It will also reduce the potential for drizzle but makes it
more likely that we could see reduced visibility in fog on
elevated coastal terrain. High-resolution models still show
widespread low clouds over Orange County, the coastal areas and
western portions of the inland valleys of San Diego County,
although little cloud cover in the Inland Empire.

From previous discussion...
Water vapor imagery currently shows a weak Rex block with a closed
upper low over the coast of central CA and a high over OR. The
block, such as it is, will quickly dissolve into a ridge over the
western states as the low moves inland and becomes an open wave
over AZ by late Monday. High temperatures on Monday will likely be
similar to highs today, with only slight warming by a degree or
two for the deserts and Coachella Valley.

Tuesday through Thursday, the ridge shifts slightly northeast and a
quick warm up ensues for nearly all locations east of the coasts.
One noticeable change in the models compared to previous runs is the
indication of some gulf moisture trying to sneak up into the deserts
and Coachella Valley on Tuesday and moreso on Wednesday, which
would severely limit the warming potential there. Should this
occur, highs in the low deserts and Coachella valley may be cooler
by around 3-7 degrees compared to the current forecasted highs
for both Tuesday and Wednesday. At this point, chances of
exceeding 105F in the Coachella Valley on Tuesday are around 70%
while the chance for exceeding 110F is around 40%. Elsewhere, the
shift of the high to the north has encouraged significant heating
from the previous forecast, with highs for many spots in the
Inland Empire now expected to be well over 90F, with around a 60%
chance of hitting or exceeding 95F both Tuesday and Wednesday for
locations like San Bernardino and Hemet. For the coastal regions,
a shallower marine layer would support a slightly quicker burn off
and warmer afternoons, but at this point the moderate onshore
flow looks to help it persist along the direct coast through at
least mid week, helping hold temperatures near normal for mid June
while other locations heat up.

There is still strong agreement between the global models with an
upper low moving south along the Canadian coastline, breaking
down the ridge and zonal flow aloft settles in over the region.
Newest guidance slows down this low and shifts the high into Baja
late week and eventually into the Four Corners this weekend, with
weak ridging over SoCal for the end of the week and stronger
ridging for the weekend. Currently, ensemble members support this
pattern compared to the more aggressive troughing, and this would
prevent much cooling off for inland areas and the deserts through
the end of the week. Should this pan out, there may be more
stagnant temperatures or only a slight cooldown into the end of
the week with a quick warm up this weekend. There remains a lot of
uncertainty with the placement of the high as well as the
Canadian low, but have generally adjusted temperatures to match
this warmer solution in the long term.

&&

.AVIATION...
090345Z....Coast/Valleys...Low marine layer clouds (based largely at
700-1000ft MSL) have been filling back in this evening across San
Diego County and into southern Orange County. Clouds will continue
to spread through Orange County through 06-09z with patchy coverage
expected for the Inland Empire by 09-12z. There`s about a 70 percent
chance of CIGs at KONT and a 40 percent chance of CIGs to KSBD
overnight. VIS restrictions to 2-5 SM in BR for elevated inland
valleys and coastal higher terrain. Low clouds expected to clear to
the coasts by 17-18z Monday morning, with partial and intermittent
clearing possible along the immediate coasts of San Diego County
between 21-00z Monday afternoon. Better confidence in clearing
through coastal Orange County. Low clouds fill back inland after 00z
Tuesday with lower bases and likely less inland extent than tonight.

Mountains/Deserts...Mostly clear skies and unrestricted VIS
through Monday night.

&&

.MARINE...
No hazardous marine conditions are expected through Friday.

&&

.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...PG
AVIATION/MARINE...Munyan