National Weather Service Forecast Discussion

Dicussion provided by the National Weather Service Forecast Office located in San Diego, California

000
FXUS66 KSGX 220404 AAA
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
904 PM PDT Tue Aug 21 2018

.SYNOPSIS...
Dry and fair weather will prevail through early next week with
temperatures mainly near normal. Coastal low clouds and fog will
extend into portions of the valleys each night and morning.

&&

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

Just one heavy thunderstorm this afternoon just west of Indio with
brief heavy rain that prompted a flood advisory. The brief visit of
monsoonal moisture has shunted to the east with a more pronounced SW
flow aloft more evident on this evening`s sounding from KNKX. Drier
flow will continue to build into the region through tomorrow.

No significant changes were made this evening and the previous
discussion remains in place below.

After today we can say adios to the monsoon moisture for a while.
The marine layer will continue very much as is into next week, deep
enough to extend low clouds into some valleys during the nights and
mornings. A stationary yin- yang pattern over the West will
continue, a Pacific Northwest trough conjoined with a Texas ridge.
With the ridge axis just barely to our south, the flow over SoCal
will be southwest, which is a dry pattern. This weekend into next
week the trough slowly deepens, which would bring cooler weather
with more extensive coastal clouds nights and mornings next week.
Temperatures will continue a little above average, but if the long-
term model trends hold, the month might end up actually cooler than
average.

&&

.AVIATION...
220300Z...Coasts/Valleys...SCT-BKN015 near the coast through 01Z
becoming BKN-OVC015-018 tops 022 and spreading 30 miles inland
through 14Z Wednesday. Areas of vis 2-4 miles in the valleys through
17Z. Clouds clearing back to the coast through 19Z Wednesday.
Stratus with similar bases expected again coast to the valleys Wed
night.

Mountains/Deserts...VFR will prevail with a few high cirrus clouds.

&&

.MARINE...
No hazardous marine weather is expected through Saturday.

&&

.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...MM/JMB
AVIATION/MARINE...Gregoria

NWS SGX Office Area Forecast Discussion