Scientific Forecaster Discussion
fxus66 ksgx 261006
Area forecast discussion
National Weather Service San Diego California
306 am PDT Fri may 26 2017
cooler with light showers possible today as a weak trough of low
pressure moves through the region. Strong gusty winds will
continue in the mountains and deserts through late morning. High
pressure aloft will rebuild over the west this Holiday weekend for
warmer weather and a shallower marine layer. Another cooling
trend may begin next Tuesday as another trough develops near
Discussion...for extreme southwestern California including Orange...
San Diego...western Riverside and southwestern San Bernardino
Low clouds have filled in along the coastal mountain slopes
westward this morning. Radar is not picking up much this morning,
but there was a report of drizzle at Newport Beach late last
night. Will keep slight chance of showers in the forecast through
the morning as the trough makes its way through, but for the most
part looks like we'll mostly get some light drizzle with little in
the way of accumulating rain.
Strong southwest to west winds are ongoing in portions of the
mountains and deserts, most notably through the passes. Whitewater
is currently reporting gusts of 70 mph, while Mountain Springs
grade along I-8 just over the Imperial County line is reporting
gusts of 61 miles per hour. Winds will slowly diminish through mid-morning
and a Wind Advisory remains in effect for portions of the low
deserts through 8 am. Otherwise partly cloudy and cool today with
highs generally ranging from 5 to 15 degrees below normal.
For the remainder of the forecast period, may gray will be in full
effect with only minor day-to-day variations along the coast.
Temperature trends will be more pronounced inland. For the
Memorial Day Holiday weekend, and upper level ridge will amplify
and slowly move over the western U.S., Resulting in warning and a
shallower marine layer. Low clouds and fog will spread into the
coastal areas and western valleys each night, and may be stubborn
to clear at the beaches at times. Further inland, high temps will
rise to about 5 to 8 degrees above normal by Monday.
For Tuesday through Thursday, a pair of weak troughs move through.
The first tracks through northern baja Tue/Wed and may develop
into a closed low, with the second wave tracking across central California
Thu/Fri. This will bring a return of cooler weather inland with
highs a few degrees below normal. The marine layer will deepen
once again with low clouds spreading into the inland valleys.
Gusty winds will develop in the mountains and deserts each
afternoon and evening.
260900z...coast/valleys/coastal mountain slopes...widespread low
clouds will continue this morning with bases 2500 to 3500 ft mean sea level and
tops will be 3500-5000 ft mean sea level. Areas of drizzle and scattered light
showers are also possible this morning, mainly between about 12z to
18z. Areas of terrain obscurations will occur on the slopes below
5500 ft mean sea level through 20z this afternoon. Gradual clearing will occur
this afternoon with any cloud bases VFR by 18z. Coastal stratus will
likely return tonight with bases likely lower than this morning.
Mountains/deserts...areas of SW-west winds with surface gusts 35-50 kt
along the desert slopes/foothills and through the passes will
continue this morning, with moderate to strong up and downdrafts,
along with with pockets of wind shear over and NE/east of the mountains.
no hazardous marine weather is expected through Tuesday.
California...Wind Advisory until 8 am PDT this morning for San Diego County
deserts-San Gorgonio Pass near Banning.