730 FXUS66 KLOX 292111 AFDLOXArea Forecast Discussion National Weather Service Los Angeles/Oxnard CA 211 PM PDT Mon Sep 29 2025
.SYNOPSIS...29/121 PM.
Cooler than normal conditions will persist through the week, but temperatures should rise a little each day starting on Wednesday. Night through morning low clouds with patchy drizzle will be possible across the coast and valleys through Tuesday.
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.SHORT TERM (TDY-THU)...29/206 PM.
Overall looks like a quiet next few days as a couple of weak upper level troughs move through the region. The first trough is passing over the area this afternoon and it`s creating some mixing in the lower levels that is disrupting the marine layer along the Central Coast. Hi res models are in pretty good agreement showing those clouds returning there tonight as well as south of Pt Conception but confidence with that is definitely on the lower side, especially with another trough passage expected Tuesday. For now have left the 4000 ft marine layer in tact across all coast/valley areas tonight and Tuesday along with the possibility of some morning drizzle, especially along the Central Coast and up against the lower coastal slopes. Highs should drop a couple degrees in most areas, possibly more if clouds linger longer than today.
Heights will rise Wed and Thu after the trough passes which should bring the marine layer back down to relatively normal levels and bring some warmer temperatures to the area. By Thursday highs are expected to be within a couple degrees of normal in most areas. There will also be some increasing northerly winds in some areas but mainly the southwest Santa Barbara County.
.LONG TERM (FRI-MON)...29/210 PM.
The low that is currently spinning off the Aleutian Islands, is expected to move little through Wednesday, then quickly get shoved towards the southeast and into Nevada by Friday. There is a range of placements of where that low will be on Friday, varying from west to east by about 100 miles. A more west track (smallest chance) could result in a few isolated showers over the area. A more east track (higher chance) would result in some gusty west to northwest winds on Friday, including the ocean and coastal areas. Fairly benign conditions to follow over the weekend. Another low will be in the neighborhood early next week, with a lot of signals pointing to an inside slider track. As should be expected, there is a lot of uncertainty in terms of timing, track, and impacts - from high winds, showers and thunderstorms, or gusty north winds with moderate fire weather concerns. Stay tuned.
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.AVIATION...29/1557Z.
At 1600Z at KLAX, the marine layer was based around 2000 feet deep. The top of the inversion was 5200 feet with a temperature of 17 degrees Celsius.
For 18Z TAF package, high confidence in desert TAFs, but only low to moderate confidence in coastal/valley TAFs. Timing of flight category changes could be +/- 3 hours of current forecasts.
KLAX...Moderate confidence in 18Z TAF. There is a 30% chance of MVFR CIGs 18Z-02Z. Timing of flight category changes in current TAF could be +/- 3 hours of current forecasts. No significant easterly wind component is expected.
KBUR...Moderate confidence in 18Z TAF. Timing of return of MVFR CIGs could be +/- 3 hours of current 08Z forecast.
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.MARINE...29/135 PM.
For the Outer Waters, moderate to high confidence in current forecast. Today through Tuesday, high confidence in wind and seas remaining below Small Craft Advisory (SCA) levels. On Wednesday, there is a 30% chance of SCA level winds across PZZ670 and a 60-70% chance across PZZ673/676. For Thursday and Friday, there is a 60-80% chance of SCA level winds and seas across all the Outer Waters. On Saturday, the chances of SCA level winds continuing drops to 30-50%.
For the Inner Waters north of Point Conception, moderate to high confidence in current forecast. Today through Tuesday, high confidence in winds and seas remaining below SCA levels. For Wednesday, there is a 30% chance of SCA level winds in the afternoon and evening hours. For Thursday and Friday, there is a 50-60% chance of SCA level winds in the afternoon and evening hours. On Saturday, there is a 30% chance of SCA level winds in the afternoon and evening hours.
For the Inner Waters south of Point Conception, moderate to high confidence in current forecast. For a majority of the southern Inner Waters, high confidence in winds and seas remaining below SCA levels through Saturday. The only exception will be the western half of the Santa Barbara Channel with a 50-70% chance of SCA level winds Tuesday through Friday, mainly in the late afternoon and evening hours.
Through Wednesday, a southerly swell of 3 to 6 feet will impact the coastal waters and may produce issues for exposed south facing harbors. Starting Wednesday night, seas will build to 7 to 11 feet across the Outer Waters and nearshore waters north of Point Sal, and 5 to 8 feet across the Inner Waters south of Point Conception.
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.BEACHES...29/135 PM.
A moderately-long period southerly swell will last into Wednesday, generated by Hurricane Narda. Hazardous rip currents and elevated surf are expected to continue for south- facing beaches, especially across Los Angeles and Ventura Counties, as well as Avila Beach and Port San Luis for the Central Coast. Additionally, particularly vulnerable south-facing beaches may see shallow coastal flooding over normally dry beach areas.
A HIGH SURF ADVISORY remains in effect for the Malibu Coast, with surf of 5 to 8 feet again expected. A BEACH HAZARDS STATEMENT remains in effect through Wednesday for all other south-facing beaches along the Central Coast (4-7 feet, local sets to 8 feet), Ventura and Los Angeles Counties (3-6 feet).
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.LOX WATCHES/WARNINGS/ADVISORIES... CA...Beach Hazards Statement in effect through Wednesday afternoon for zones 87-340-346-354-366. (See LAXCFWLOX). High Surf Advisory in effect until 6 PM PDT Wednesday for zone 362. (See LAXCFWLOX). PZ...NONE.
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PUBLIC...MW/Kittell AVIATION...RAT MARINE...RAT BEACHES...RAT SYNOPSIS...RK
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Experimental Graphical Hazardous Weather Outlook at: https://www.weather.gov/erh/ghwo?wfo=lox
NWS LOX Office Area Forecast Discussion