03/1144 AM.
Seasonably warm weather will continue away from the immediate coast, while far interior areas will continue to bake under triple digit temperatures all week. Along the coast low clouds and locally dense fog will develop and could linger into the afternoon in some areas.
(tdy-Thu), 03/1205 PM.
The semi-permanent high pressure system over AZ and most of the southwest will stick around all week, maintaining very similar day to day weather. This includes a 1200-1700 ft marine layer that could create some patches of dense fog near the coast as well as extreme heat across the mountains and deserts with temperatures between 100 and 110 as well as seasonably warm temperatures across the Downtown and valley areas. Most of the ensemble models indicate very little change in this pattern through mid week, with actually some additional 1-3 degrees of warming later in the week.
(Fri-Mon), 03/1223 PM.
Interior heat will continue through at least Friday or Saturday and there is a 60-80% chance that the current suite of heat hazards will be extended, possibly into this coming weekend as strong high pressure remains locked in place. Valleys and even some coastal areas should see some additional warming late week as onshore flow weakens and there is a 10-20% chance that heat advisories will be needed Friday and Saturday for the valleys.
Models are still indicating increasing monsoon moisture starting around Friday and peaking over the weekend which could add to the heat risk factors and make it feel more sticky and uncomfortable. Though at this point chances for any precipitation are 5% or less.
Beyond that a majority of the ensemble solutions show weakening high pressure over southern California with a significant cooling trend, with temperatures falling to near or even slightly below normal levels.
03/1724z.
At 1626Z at KLAX, the marine layer was 1600 ft deep. The top of the inversion was near 4100 feet with a temp of 27 C.
High confidence in VFR conds for KPRB, KBUR, KVNY, KPMD and KWJF. There is a 15% chance for brief LIFR conds at KPRB/KBUR/KVNY between 08Z and 15Z.
Moderate confidence with the remaining TAFs. There is a 20% chance KOXR does not clear today and remains IFR to MVFR. Otherwise, VFR transtion may be off +/- 1 hour. Arrival of cigs tonight may be off +/- 2 hours. There is a 30% chance for LIFR conds at KSBA, KOXR, KCMA tonight, and a 50% chance for VLIFR conds at KSMX/KSBP from 07Z-15Z.
KLAX, Moderate confidence in TAF. Cigs may arrive between 01Z and 06Z, with a 20% chance cigs remain AOB 010 when cigs are present. No significant east wind component expected.
KBUR, High confidence in TAF. However there is a 15% chance for brief LIFR conds at KPRB/KBUR/KVNY between 08Z and 15Z.
03/859 AM.
Winds and seas are expected to continue to improve today and remain below Small Craft Advisory (SCA) criteria through the week, with the exception of northwest winds locally gusting to 20-25 knots in typically windy areas near Point Conception each afternoon and evening.
Dense fog may affect portions of the coastal waters each night through morning through much of the week, especially across the waters norther and west of Point Conception.
Ca, Extreme Heat Warning in effect until 8 PM PDT Tuesday for zones 38-377. (See LAXNPWLOX). Heat Advisory in effect until 8 PM PDT Wednesday for zones 344-345-353-375-376-378>380. (See LAXNPWLOX). Extreme Heat Warning in effect until 8 PM PDT Wednesday for zones 381>383. (See LAXNPWLOX). PZ, NONE.
