Area Forecast Discussion
National Weather Service Los Angeles/Oxnard CA
601 PM PDT Tue Sep 27 2022

SYNOPSIS...27/922 AM.

Persistent high pressure and the associated heat wave will peak today and Wednesday before a weak low to the north brings cooler conditions to the region Thursday.  Cooler weather should last through the weekend with increasing night to morning low clouds and onshore winds.

SHORT TERM (TDY-FRI)...27/128 PM.

Another hot day across the area, though not so bad near the coast where temps have been mostly in the 70s and 80s despite the 2-4 degree rise today from yesterday`s highs.  Light offshore gradient trends are expected to continue into Wednesday with the only real difference tomorrow being a stronger onshore push later in the afternoon.  That should help keep the coastal areas all below heat advisory criteria but likely too late for the valleys and at least the interior portion of the Santa Monicas where highs should top out near or possibly just a degree or two lower than today.  So will end all coastal heat advisories today and continue the inland warnings one more day.

After Wednesday high temps should begin a steady decline to normal through the rest of the week as onshore flow returns and heights/thicknesses drop.  Expect we`ll see an eventual return of the marine layer to areas south of Pt Conception but a persistent northerly flow across western Santa Barbara County may limit that to LA and possibly Ventura Counties until those lighten up Thursday and Friday.  Those winds could reach close to advisory levels on the far western end between Refugio and Pt Conception the next couple nights but will hold off on that for now.