textproduct: Los Angeles

SYNOPSIS

06/214 PM.

Night through morning low clouds and fog will be common over coastal areas and the coastal valleys through at least this weekend, with clearing each afternoon. Hazardous heat will occur through this weekend over interior areas. Aside from the chance of a few mountain showers on Sunday, dry conditions will prevail.

LONG TERM (MON-THU)

06/132 PM.

Cooling will finally arrive on Monday, with a gradual cooling trend through the long term. The ridge will slowly weaken as a series of weak trofs moves through OR and far nrn CA. Hgts will fall to 592 dam. At the same time onshore flow will increase both to the north and the east becoming strongly onshore in both directions in the afternoons. The marine layer will respond to this and low clouds will likely begin to xtnd into the vlys. Look for slower than normal clearing and some west facing beaches may see only limited clearing each afternoon and evening.

The combination of a deeper marine layer, stronger onshore flow, and falling hgts will bring 2 to 3 degrees of cooling each day Monday through Thursday. Max temps will approach normals on Tuesday and then most areas will see blo normal max temps on Wed and Thu. Vly temps on Wed and Thu will only be in the mid 80s to lower 90s.

PWs will remain elevated through the period, however. This in combination with warmer than normal ocean temperatures off the immediate coast will continue to make things feel a little stickier than normal. It will also keep overnight lows a little warmer than normal. We will remain on the fringe of the monsoonal moisture through at least Wednesday. The elevated moisture and increased instability will keep keep the low chc (10 to 15 percent) of afternoon mountain convection going.

The strong onshore flow to the east will produce gusty near advisory level wind gusts across the western Antelope Vly and the western foothills.

AVIATION

07/0245Z.

At 2211Z at KLAX, the marine layer was 200 feet deep. The top of the inversion was at 3600 feet with a temperature of 27 C.

High confidence in TAFs for KPRB, KBUR, KVNY, KPMD & KWJF.

Moderate confidence in remaining TAFs. Timing of flight cat restrictions may be off +/- 2 hours. Lower confidence in heights and visibility, which could be as low as LIFR for coastal sites from KCMA north, and IFR conditions south.

KLAX...Moderate confidence in the 00Z TAF. CIGs expected to return 05Z-16Z, but timing could be off by +/- 2 hours from TAF times. 40% chance for IFR conditions overnight. No significant east wind component expected.

KBUR...High confidence in the 00Z TAF with VFR conds expected.

MARINE

06/213 PM.

Winds and seas are expected to remain below Small Craft Advisory (SCA) criteria into this weekend, with the exception of northwest winds locally gusting to 20-25 knots in typically windy areas around and to the south of Point Conception each afternoon and evening through Saturday.

Dense fog may affect portions of the coastal waters each night through morning, especially this weekend across the waters north and west of Point Conception.

LOX WATCHES/WARNINGS/ADVISORIES

CA...Extreme Heat Warning in effect until 8 PM PDT Sunday for zones 38-377-381>383. (See LAXNPWLOX). Heat Advisory in effect until 8 PM PDT Sunday for zones 344-345-353-375-376-378>380. (See LAXNPWLOX). PZ...NONE.