textproduct: Los Angeles

SYNOPSIS

10/1231 PM.

Temperatures away from the coast will warm into the 80s and 90s through Monday. 100 degree readings may occur locally in the warmest valleys and Antelope Valley. Coastal low clouds will develop each night, expanding into the valleys Tuesday as a cooling trend begins.

LONG TERM (THU-SUN)

10/121 PM.

Increasing northerly flow aloft is expected Thursday as the upper low over northern California moves into Nevada. Ensemble pressure gradient charts show increasing north to south gradients across the Santa Ynez Range and the western Transverse Range beginning as early as Wednesday evening and continuing through at least Saturday. Gradients expected to be in the -3 to -5 range during that period that would support at least advisory level winds, strongest in the late afternoon and overnight hours.

The increase in northerly flow may keep low clouds away from southern Santa Barbara County but otherwise expecting the marine layer to push into most of the coastal and valleys each day. Temperatures will be 5-10 degrees below normal Thursday, then reaching near normal temperatures Friday and 3-6 degrees above normal next weekend as high pressure aloft returns.

AVIATION

11/0608Z.

At 0551Z at KLAX, the marine layer was 900 feet deep. The top of the inversion was at 3600 feet with a temperature of 23 C.

High confidence in KWJF and KPMD TAFs.

Low to moderate confidence in remainder of TAFs. Timing of flight category changes may be off by 3 hours and one flight category at any point. There is a 40 percent chance that VFR conds prevail for KBUR/KVNY. There is a 40% chance of VLIFR conditions at KPRB in the 13Z-17Z time frame.

KLAX...Moderate confidence in TAF. There is a 25 percent chc of 4SM BR BKN004 conds 10Z-15Z. There is a 20 percent chc of BKN012 conds persisting through the afternoon. Any east wind component will be AOB 6kt.

KBUR...Low confidence in TAF. There is a 40 percent chance that VFR conds prevail.

MARINE

10/721 PM.

Across the outer and northern waters, Both winds and seas will diminish below Small Craft Advisory levels overnight. Conditions are then expected to remain below advisory levels across all the coastal waters through Tuesday.

Wednesday night through the weekend, winds and seas will start to strengthen/build, with SCA winds across the outer waters starting late Wednesday night and Seas reaching steep and choppy SCA levels around Friday night. There is a 30-40% chance of SCA winds across the inner waters, with the highest chances each afternoon and evenings especially across the western portion of the Santa Barbara Channel. GALE Force winds will be possible across the outer waters as early as Thursday afternoon, with highest chances on Saturday into Sunday.

Dense fog may become more widespread each night to morning through Tuesday morning.

LOX WATCHES/WARNINGS/ADVISORIES

CA...NONE. PZ...Small Craft Advisory in effect until 3 AM PDT Monday for zones 670-673. (See LAXMWWLOX).