textproduct: Los Angeles

SYNOPSIS

25/212 AM.

Marine layer clouds with patchy fog will reoccur each night from the coasts to the coastal valleys, expanding into the valleys into this weekend. Temperatures will trend cooler, with below normal temperatures through the weekend.

LONG TERM (MON-THU)

25/1133 AM.

PacNW low pressure system will continue rotating northward into Canada with another closed low forming over Washington early next week. Ensemble solutions begin to differ in the details heading into middle of next week but all feature general troughing for the upper-level pattern over CA through late next week. This will keep onshore flow in place with low stratus/fog along coastal areas and valleys each evening and morning. Winds will run lighter next work week. Temperatures will remain fairly consistent into mid- to late next week, with daytime highs right around climatological norms to slightly above.

AVIATION

25/2101Z.

At 1715Z at KLAX, the marine layer was 2200 ft deep. The top of the inversion was at 3900 feet with a temperature of 19 C.

High confidence in VFR TAFs for desert airfields (KPMD & KWJF).

Moderate confidence in the remainder of the TAFs. Timing of flight cat changes could be off +/- 2 hours and CIG heights +/- 300 ft.

KLAX...Moderate confidence in TAF. There is a 15% chance that CIGs do not clear, and a 30% chance of intermittent CIGs from 25/21Z through 26/01Z. Generally expecting MVFR CIGs 010-018, but likely CIGs fall to around IFR 008 from 26/05Z-10Z. No significant east wind component expected.

KBUR...Moderate confidence in TAF. Arrival of IFR CIGs should be accurate within +/- 2 hours of current forecast. No wind issues expected.

MARINE

25/134 PM.

NW winds will increase to Small Craft Advisory (SCA) levels Thursday evening across the northern waters and will expand to the south Friday into the weekend. SCA winds will be strongest on Saturday, and will reach into the nearshore waters along the Central Coast and Santa Barbara Channel at times (more often than not). Local gusts may approach 35 kt near Pt. Conception Saturday evening into the overnight hours. Seas will near 10 ft Saturday evening through at least Monday morning. Beyond, conditions look to quiet down a bit through mid next week.

LOX WATCHES/WARNINGS/ADVISORIES

CA...NONE. PZ...Small Craft Advisory in effect from 6 PM this evening to 9 AM PDT Monday for zone 670. (See LAXMWWLOX). Small Craft Advisory in effect from 9 PM this evening to 9 AM PDT Monday for zone 673. (See LAXMWWLOX). Small Craft Advisory in effect from 3 AM Friday to 9 AM PDT Monday for zone 676. (See LAXMWWLOX).