textproduct: Los Angeles

SYNOPSIS

04/840 AM.

Near to slightly above normal are temperatures expected through Friday, except significant cooling in the mountains and interior areas Thursday and Friday. Temperatures will increase region wide Saturday and Sunday. Strong and gusty northerly winds expected across much of the area Wednesday night into Thursday morning. Moderate to strong Santa Ana winds likely over the weekend.

LONG TERM (SAT-TUE)

04/252 AM.

After the cutoff low spins in place off the coast of Baja California on Sunday, it will eject to the east on Monday. Fairly weak ridging will move in and a dramatic swing to onshore flow will usher in cooler air from natures air conditioner (Pacific Ocean). The marine layer will likely return after a few day hiatus, with better chances late Monday into Tuesday. The chances for any very light precipitation from wrap-around moisture has decreased and dry conditions are expected for at least the next couple of weeks.

AVIATION

04/2019Z.

Around 1915Z, the marine layer was around 2200 ft deep at KLAX. The top of the inversion was around 3300 feet with a temperature near 17 degrees Celsius.

Moderate to high confidence exists in the current forecast. High confidence exists in the forecast in desert terminals. Lower confidence exists in the forecast for all remaining terminals, lowest for Los Angeles County coastal terminals. Timing of winds and flight category changes could be off by up to two hours earlier or later. Periods of moderate to strong wind shear and turbulence will be possible after 20Z. There is chance that MVFR conditions may linger through the day at Ventura and Los Angeles County coastal terminals.

KLAX...MVFR conditions could clear as soon as 21Z but more likely around 22Z. There is a 30 percent chance of clearing at all with MVFR conditions remaining in at KLAX through at least 08Z Thursday. North winds greater than 10 knots are likely after 07Z Thursday. There is a 20 percent chance that wind gusts to 25 knots may not occur after 10Z. There is a 10 percent chance of sustained northerly cross winds greater than 20 knots between 10Z and 16Z. Periods of moderate to strong low-level wind shear and turbulence are likely between 10Z and 16Z.

KBUR...VFR conditions are expected through the period, but there is a low chance of MVFR visibilities developing overnight for up to two hours. North winds greater than 10 knots are likely after 04Z Thursday. There is a 10 percent chance that wind gusts to 25 knots may not occur after 10Z. There is a 20 percent chance of sustained northerly winds greater than 20 knots between 08Z and 16Z. Periods of moderate to strong low-level wind shear and turbulence are likely between 08Z and 16Z.

MARINE

04/1219 PM.

Moderate to high confidence in the current forecast. Higher confidence exists in the forecast for winds. Less confidence in the forecast for seas. Seas could be up to 1-3 feet higher than forecast, especially today through Saturday.

Marine weather conditions will deteriorate through tonight with widespread strong Small Craft Advisory (SCA) and GALE conditions expected through at least Thursday night. GALE WARNINGS remain in effect through Friday morning for some waters.

Another period of strong winds will develop across the region as an offshore flow pattern will set up Friday through Sunday. There is a high to likely (40 to 60 percent) chance of SCA level winds between Friday night and Sunday. There is a moderate (30-40 percent) chance of GALE FORCE wind gusts inside the southern California bight, and high (40-50 percent) chance of SCA level winds along the nearshore waters of the Central Coast.

LOX WATCHES/WARNINGS/ADVISORIES

CA...Wind Advisory remains in effect from midnight tonight to 9 AM PST Thursday for zones 87-366-367. (See LAXNPWLOX). Wind Advisory remains in effect from 6 PM this evening to 9 AM PST Thursday for zones 88-371>375. (See LAXNPWLOX). Wind Advisory remains in effect until 2 AM PST Thursday for zones 346-347. (See LAXNPWLOX). Wind Advisory remains in effect from 4 PM this afternoon to 9 AM PST Thursday for zones 349>352-356-357-381>383. (See LAXNPWLOX). High Wind Warning remains in effect from 4 PM this afternoon to 7 AM PST Thursday for zones 353-376>378. (See LAXNPWLOX). High Wind Warning remains in effect from 2 AM to 9 AM PST Thursday for zones 362-369-370. (See LAXNPWLOX). High Wind Warning remains in effect from 9 PM this evening to 9 AM PST Thursday for zones 379-380. (See LAXNPWLOX). PZ...Small Craft Advisory in effect until 3 PM PST this afternoon for zones 645-650. (See LAXMWWLOX). Gale Warning in effect until 9 AM PST Thursday for zones 645-650. (See LAXMWWLOX). Gale Warning in effect from 10 PM this evening to 10 AM PST Thursday for zone 655. (See LAXMWWLOX). Gale Warning in effect until 3 AM PST Friday for zones 670-673-676. (See LAXMWWLOX).