FXUS66 KLOX 090249 AFDLOX Area Forecast Discussion National Weather Service Los Angeles/Oxnard CA 749 PM PDT Thu May 8 2025 .SYNOPSIS...08/143 PM. A warming trend will continue through Saturday as high pressure aloft will be in place over California. However, continued onshore flow will keep temperatures cooler near the coast. Onshore flow will strengthen next week and bring much cooler conditions with low clouds and fog pushing back into the valleys. && .SHORT TERM (THU-SUN)...08/206 PM. High pressure building over the region will bring much warmer weather through the weekend, peaking Friday and Saturday with highs approaching 100 in the warmest valleys and even low to mid 80s across inland portions of the coastal plain. Highs will be very close to daily records in the valleys and heat advisories have been posted across the valleys and Santa Monica mountains. The marine layer depth has lowered to 1000 feet or less, meaning stratus will be confined to the coastal areas at best with some dense fog during the overnight and morning hours. Onshore flow will remain weak the next few days, but weakest Friday, then slowly increasing Saturday and Sunday. The high pressure ridge will shift east late Saturday into Sunday allowing cooler air from the ocean to surge inland. The timing of this surge will determine how much temperatures drop on Sunday. There are still quite a few model solutions keeping highs in the valleys in the 90s Sunday, especially the eastern San Fernando and Santa Clarita valleys. .LONG TERM (MON-THU)...08/218 PM. Much cooler temperatures are expected next week as troughing replaces the high pressure ridge. The trough is deepest late Tuesday into Wednesday and slightly more than half of the ensemble solutions are showing some drizzle or light rain along the Central Coast. There are far fewer solutions showing any precip south of Pt Conception but would not be surprised to see a return of a 3000' or higher marine layer with areas of drizzle or light rain across coast and valley areas, especially those areas adjacent to the south facing mountains. Rapidly increasing onshore flow will mean a return of gusty afternoon and evening winds to the interior areas, especially the Antelope Valley. That system is expected to shift east of the area later Wednesday but general troughing will continue through the remainder of the week, maintaining cooler than normal temperatures. && .AVIATION...09/0224Z. At 00Z at KLAX, the marine inversion was based near the surface. The top of the inversion was 1900 feet with a temperature of 23 degrees Celsius. High confidence in VFR conds prevailing for KPMD KWJF KPRB KBUR KVNY through the period. Low to moderate confidence elsewhere with a 20 percent chance of VFR conds prevailing for KOXR and south including KLAX. There is a 20-30 percent chance of IFR or lower cigs/vsbys between 09-16Z for coastal sites. Timing of low cigs/vsbys may be off by 2-3 hours. KLAX...Low confidence in TAF. Cigs most likely in the 400-800 range with a 20 percent chance that VFR conds prevail. Arrival tonight may be 2-3 hours later than forecast. No significant east wind component is expected. KBUR...High confidence in TAF. There is a 10% chance for 4SM to 5SM BR/HZ 12-16Z. && .MARINE...08/1234 PM. Low confidence in Small Craft Advisory in effect this evening into the overnight for the outer waters. High confidence in at least SCA conds focused across the outer waters through Saturday, becoming widespread by Sunday and potentially continuing into early next week. There is a 20-40 percent chance of Gales in the Saturday evening through Monday time frame, with the lowest potential focused across the inner waters, especially south of the Channel Islands. Dense fog focused in the night to morning hours may become more common through Friday or Saturday. && .LOX WATCHES/WARNINGS/ADVISORIES... CA...Heat Advisory in effect from 10 AM Friday to 9 PM PDT Saturday for zones 88-343-356>358-369>375-548. (See LAXNPWLOX). PZ...Small Craft Advisory in effect until 3 AM PDT Friday for zones 670-673-676. (See LAXMWWLOX). && $$ PUBLIC...MW AVIATION...Phillips MARINE...Munroe SYNOPSIS...MW weather.gov/losangeles Experimental Graphical Hazardous Weather Outlook at: https://www.weather.gov/erh/ghwo?wfo=lox