textproduct: Los Angeles

SYNOPSIS

06/243 AM.

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 possibility of a couple mountain showers on Sunday, dry conditions will prevail.

LONG TERM (SUN-WED)

06/225 AM.

Cooling will finally arrive on Monday.

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.

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 will make things feel a little stickier than normal and will keep overnight lows a little warmer than normal. This moisture will keep the low chc (10 to 15 percent) of afternoon mtn convection going through the period.

AVIATION

06/0944Z.

At 0820Z at KLAX, the marine layer was 1100 feet deep. The top of the inversion was at 4100 feet with a temperature of 28 C.

High confidence in TAFs for KPMD & KWJF.

Good confidence in TAFs for KBUR & KVNY with a 15 percent chc of IFR cigs 13Z-16Z.

Moderate confidence in remaining TAFs. Timing of flight cat restrictions may be off +/- 2 hours, and CIG heights by +/- 200 ft.

KLAX...Moderate confidence in TAF. There is a 30 percent chc that cigs will remain AOA 010. VFR conds could arrive any time between 17Z and 19Z. No significant east wind component expected.

KBUR...Good confidence in TAF. There is only a 15% chance of BKN-OVC006-010 conds 13Z-16Z.

MARINE

06/243 AM.

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.

Dense fog may affect portions of the coastal waters each night through morning into this weekend, especially 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.