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.
(Mon-Thu), 03/821 PM.
The semi-permanent high pressure system over Arizona and most of the southwest will persist all week, maintaining very similar day to day weather. Stronger onshore flow and a deeper marine layer between 1200 and 1500 feet has brought some cooling to coastal and coastal valley locations as compared to the past few days. In addition, there could be patchy dense fog across portions of the coast, with best chances across the Central Coast. Temperatures remain quite hot across the interior, with little change expected through much of the week. With higher confidence of the hot temperatures persisting, have extended the current heat warnings and advisories through Saturday. Areas under the Heat Warnings (Antelope Valley, Cuyama Valley, and northern Ventura mountains) will see temperatures of 100 to 107 degrees common, with isolated readings of 107 to 110 degrees in the eastern Antelope Valley.
(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.
03/2314z.
At 2320Z at KLAX, the marine layer was 900 feet deep. The top of the inversion was near 2400 feet with a temp of 28 C.
High confidence in VFR conds for KPRB, KBUR, KVNY, KPMD and KWJF. There is a 10% chance for brief LIFR conds at KPRB/KBUR/KVNY between 11Z and 15Z.
Moderate confidence with the remaining TAFs. 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 03Z and 05Z, 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 10% chance for brief LIFR conds at KPRB/KBUR/KVNY between 10Z and 15Z.
03/658 PM.
Winds and seas are expected to 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 north and west of Point Conception.
Ca, Extreme Heat Warning in effect until 8 PM PDT Saturday for zones 38-377-381>383. (See LAXNPWLOX). Heat Advisory in effect until 8 PM PDT Saturday for zones 344-345-353-375-376-378>380. (See LAXNPWLOX). PZ, NONE.
