High Wind and Strong Wind in California, April 10 to 12, 2022

Area Forecast Discussion
National Weather Service San Diego CA
919 PM PDT Sun Apr 10 2022

.SYNOPSIS...
The cooling trend will continue through Tuesday as low pressure
deepens over the western states. Night and morning low clouds, will
again only partially clear along and west of the mountains through
Monday night. Strong west winds will develop Monday afternoon, and
continue through Tuesday morning in the mountains, deserts and over
the coastal waters. There is also a chance of some light rain and
mountain snow Monday night. Tuesday will be quite cool and breezy,
with more seasonal weather expected for the remainder of the week.

&&

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

Low clouds were slowly filling into the coastal basin this evening.
Over the past couple of hours though, monitoring them has been
blocked by an E-W band of high clouds moving south over the area.
The onshore sfc pressure gradient across the Southland has peaked
and continues to support SW-W wind gusts of 35 to 45 MPH in wind-
prone mtn/desert areas. The 00Z Miramar sounding showed a deepening
marine layer, now topped by a 7.5C inversion based near 3000 FT MSL.

A coastal eddy is expected to strengthen overnight and may thicken
the lower clouds sufficiently for some patchy drizzle or spotty
showers but any accumulation should be minimal. Expect low clouds
will fill the coastal basin overnight, and similar to today, not
totally clear on Monday. It will be cooler as well with another 5F
temperature drop expected.

An active, spring weather pattern is developing over the Country as
a broad trough steers a number of shortwaves across the northern
states. Even though these systems will largely pass to our north,
they will influence the weather across the nation, and over SoCal.
For Monday, a shortwave of moderate strength will move through the
PacNW and on across the Rockies. Surface pressure will crater over
the Great Basin in response, and this will fuel a bout of strong
onshore flow over our mts/deserts. High Wind Warnings are now in
place for west wind gusts of 50-60 MPH and locally higher in those
onshore wind-prone areas. Farther west, a strong sfc high centered
along 140W will set up a strong E-W sfc pressure gradient along the
CA Coast. Gale force winds are likely over the offshore waters, with
strong gusts over the inner waters as well. Gale Warnings and Small
Craft Advisories will be in effect from Mon afternoon through Tue
night.

There will be a narrow wedge of Pacific moisture accompanying this
onshore surge, and even though upper-level support will be lacking,
resulting upslope flow onto the coastal slopes should provide
sufficient lift for several hours of light precipitation Mon night.
Very little is expected to accumulate along the coast, and none is
expected over the deserts.

The winds will settle down after Tuesday, and the marine layer will
decrease, helping to limit the nocturnal cloud development. Seasonal
mid-April weather follows until late in the week, when another
disturbance approaches the PacNW and tracks inland, bulking up the
marine layer and increasing the westerly winds. If any of these
Pacific weather disturbances amplify enough, we could get some more
precipitation, but for now it looks like the best chance for
meaningful rain and snow will be over northern parts of the State.

&&

.AVIATION...
110345Z...Coast/Valleys...Stratus with bases 2000-2500 ft MSL and
tops 3500-4000 ft MSL will continue to fill in over the
coasts/valleys overnight. Clouds becoming SCT-BKN with bases near
3500 ft MSL after 18Z. Clouds filling in again Monday night with
bases lowering back to 2500-3000 ft MSL. ISO -SHRA and DZ possible
Monday night.

Mountains/Deserts...Lower coastal mountain slopes becoming obscured
in clouds overnight and continuing at times through Monday night.
West winds continuing this evening with surface gusts 25-40 kt,
strong up/downdrafts, and areas of LLWS likely over/east of the
mountains, including near KPSP. Winds will weaken very slightly
starting around 09-12Z Mon before increasing again later Monday
afternoon. Gusts 40-50 kt, locally up to 60 kt, with strong-severe
up/downdrafts, LLWS, and rotors over/east of the mountains Monday
evening.

&&

.MARINE...
Northwest winds will increase Monday and Tuesday, with gale force
winds expected Monday afternoon through early Tuesday morning. Gusts
near 35 kts and combined seas of 10-13 feet are possible. Winds will
continue to gust 20-30 kts the remainder of the day Tuesday,
weakening Tuesday night. A Gale Warning for the outer waters,and a
Small Craft Advisory for the inner waters, remain in effect from 2
PM Monday through 5 AM Wednesday. Winds then gradually diminish on
Wednesday before increasing again over the outer waters on Thursday.

&&

.BEACHES...
A NW wind swell of 7-9 ft at 8-10 seconds will generate elevated and
rough surf at the San Diego County beaches late Monday into Tuesday.
Surf will generally be 3-6 ft with occasional higher sets,
especially between Solana Beach and La Jolla. Swell and surf lower
Wednesday.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...High Wind Warning from 4 PM Monday to 5 AM PDT Tuesday for Apple
     and Lucerne Valleys-Coachella Valley-Riverside County
     Mountains-San Bernardino County Mountains-San Diego County
     Deserts-San Diego County Mountains-San Gorgonio Pass Near
     Banning.

     Wind Advisory from 5 PM this afternoon to 4 PM PDT Monday for
     Apple and Lucerne Valleys-Coachella Valley-Riverside County
     Mountains-San Bernardino County Mountains-San Diego County
     Deserts-San Diego County Mountains-San Gorgonio Pass Near
     Banning.

PZ...Gale Warning from 2 PM Monday to 5 AM PDT Wednesday for Waters
     from San Mateo point to the Mexican Border Extending 30 to
     60 nm out including San Clemente Island.

     Small Craft Advisory from 2 PM Monday to 5 AM PDT Wednesday for
     Coastal Waters from San Mateo Point to the Mexican Border
     and out to 30 nm.

&&

PUBLIC...10
AVIATION/MARINE...SS