02/711 PM.
Expect cooler conditions for the coast and coastal valleys through much of this coming week, but with continued hot conditions for the interior as above-normal temperatures continue. Dense fog will affect some coastal areas.
(Sun-Wed), 02/752 PM.
***UPDATE***
Another hot day in the book, especially away from the coast. These areas saw highs in the 90s to 105, with highs up to 108 in the deserts and a some of the hottest mountain locations. The coastal areas were slightly cooler today thanks to a stronger sea breeze, with 60s-70s along the Central Coast, and 70s-80s for coastal areas further south, and some of the coastal valleys. This temperature trend will continue through the short term, with the sea breeze strengthening, the coasts and coastal valleys will continue to see slightly cooler temperatures, interior areas will remain very warm to hot through Wednesday. There is a chance that the excessive heat inland will continue later into the week and the weekend. This evening will extend the Extreme Heat Warning through Wednesday for the Ventura Mountains and Cuyama Valley, to match up with the Antelope Valley. As the warnings expire for other interior areas will issue Heat Advisories for interior San Luis Obispo County, the remaining interior mountains, and the Santa Susanas. Not anticipating any heat hazards for the coast or coastal valleys through mid week as there will be enough onshore flow to keep temperatures more moderate (although still above normal by 1-5 degrees).
As for winds, gusty onshore winds are affecting much of the area, ranging from 20 to 30 mph, but with gusts 35 to 40 mph over the interior passes and canyons into the Antelope Valley.
As high pressure remains over the area, there will be a good chance of dense fog along the Central Coast tonight into early Monday. Further south, low clouds are forecast over the coastal basins but dense fog is not expected.
***From Previous Discussion***
Going forward, there will be a very modest cool down for coast and coastal valleys the next couple days, but interior areas not so much, and especially the deserts. Latest temperature guidance there suggests minimal cool down, if any, through at least mid week and possibly through next weekend as 950mb temps remain in the 38-40c range, which typically means closing in on 110 across the deserts and 100+ in the other far inland locations mentioned above. For now have gone ahead and extended the desert Extreme Heat Warming through Wednesday, matching our neighboring forecast offices.
(Thu-Sun), 02/1254 PM.
After Tuesday temperature trends are expected to level off and possibly increase a degree or two as high pressure over AZ nudges west again through next weekend. In addition, there are some signals in the ensemble pressure gradients indicating some light offshore trends towards the end of this coming week that could result in warming temperatures across the coast and valleys as well. And as mentioned, it will remain very hot over the interior and would estimate at least a 60% chance of extended the desert Extreme Heat Warning through the end of the week and around a 20-30 percent chance of at least heat advisories for the coastal valleys. One factor that will need to be monitored is models are still indicating increasing monsoon moisture later in the week, especially by the weekend, that could introduce another heat risk factor with higher humidities and in turn warmer overnight lows.
03/0149z.
At 00Z at KLAX, the marine layer was 1100 ft deep. The top of the inversion was near 2100 feet with a temp of 29 degrees Celsius.
High confidence in VFR conds for KPRB, KBUR, KVNY, KPMD and KWJF.
Low to moderate confidence elsewhere with timing off by 2-3 hours and and 20-40 percent that VFR conds prevail. There is also a 20-30 percent chance of an early arrival sometime 00-03Z for KLAX and KSMO.
KLAX, Moderate confidence in TAF. Cigs may briefly come in early, before clearing out and reforming later (around 08-10Z. No significant east wind component expected.
KBUR, High confidence in CAVU TAF.
02/847 PM.
For the inner waters north of Point Sal, there is a 40% chance of SCA winds during through late tonight, highest along the Central Coast. Otherwise conditions are expected to remain below SCA levels across all nearshore waters.
For the Outer Waters, Small Craft Advisory (SCA) winds and seas will continue through tonight before beginning to subside early this coming week. There is a 30% chance that SCA winds will resume near and south of Point Conception.
Seas of 6-9 feet will impact the outer waters through tonight, due to a combination of long-period southerly swell and shorter- period northwesterly swell/wind- waves. Seas will begin to subside as the winds weaken late tonight into early next week.
Dense fog will affect some of the coastal waters each night and morning through much of the week.
Ca, Extreme Heat Warning in effect from 10 AM Monday to 8 PM PDT Tuesday for zones 38-377. (See LAXNPWLOX). Heat Advisory in effect from 10 AM Monday to 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, Small Craft Advisory in effect until 3 AM PDT Monday for zones 670-673-676. (See LAXMWWLOX).
