Marine Weather and Tide Forecast for Solana Beach, CA

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

This afternoon, high clouds are streaming over the region in southwest flow ahead of a weak upper level disturbance embedded in the cyclonic flow around an extensive low pressure system southeast of the Gulf of Alaska. The patchy low clouds in the coastal areas and valleys from this morning have dissipated. Temperatures are mostly a little higher than at this time yesterday except at low elevations west of the mountains where onshore flow is spreading the cooler maritime air inland. High temperatures today will be near or a few degrees above seasonal averages.

The low pressure system south of the Gulf of AK will move inland across CA through Wednesday, with the closed upper low well to our north. This will bring widespread cooling with strengthening onshore flow producing gusty southwest to west winds, mainly in the mountains and deserts where gusts of 45-50 mph will likely occur late Tue into early Wed. Height falls aloft ahead of the approaching low will enable the marine layer to deepen tonight into Monday morning, with increasing low clouds spreading farther into the inland valleys.

SoCal will be on the southern periphery of the low pressure system, with limited moisture available for precipitation. Any precipitation is likely to fall between late Tuesday and early Wednesday. Current precipitation estimates are for a trace to a few hundredths of an inch in the valleys and coastal areas, although many locations will get no precipitation. The coastal slopes of the San Bernardino Mountains could get about 0.15 inch of precipitation. The snow level will fall to about 6500-7000 ft on Wed morning but any significant snow accumulations is unlikely.

This system will also bring strong and gusty southwest to west winds to the mtns and deserts. The winds will be strongest between Tue afternoon and Wed morning when gusts of 45-50 mph, locally to 55 mph, are expected in the mtn passes and on adjacent desert slopes.

The upper level trough axis will move east on Wed morning and the winds will begin to weaken while colder air filters in from the northwest. Wednesday will likely be the coolest day with high temperatures near or a few degrees below normal in the coastal areas and low deserts while in the mountains, temperatures could be as much as 12 degrees below normal.

SoCal will remain under the influence of broad upper level troughing for the latter half of the week into next weekend. We can expect temperatures near or a little below seasonal averages with a deep marine layer and onshore flow producing breezy conditions in the mtns and deserts.

AVIATION
200600Z
Coast/Valleys
Very patchy low clouds near 1000-1600ft MSL have begun to develop over the waters and near the coast this evening. These clouds are expected to gradually increase in coverage and spread onshore over the next several hours. Clouds will likely continue to be patchy for some time, with only intermittent CIGs at first, but should become more uniform after 09z. Clouds expected to spread 20-25 miles inland by 12z, with a 30% chance for impacts vcnty KONT/KSBD from 12-16z. Low clouds scatter out around 15-17z Monday, with increasing high level clouds afterwards.

Mountains/Deserts...Elevated westerly to southwesterly winds with gusts 15-25 kts will continue to weaken over the next few hours.
Wind gusts 20-30 kts pick back up again by 00z Tuesday the mountains, desert slopes, and deserts. Otherwise, VFR conditions expected through the TAF period.

MARINE
No hazardous marine conditions are expected through Tuesday.
Elevated onshore (northwesterly) wind gusts near 20-25 knots are possible Wednesday afternoon into early Thursday morning, which would bring elevated, choppy seas. Another, briefer round of gusts to around 20 knots Thursday afternoon and evening would be more localized to the far outer waters near San Clemente Island.

SGX WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...None.