20/103 PM.
Temperatures will remain well above normal through next week, though some cooling is expected today and through this weekend. Areas of dense coastal fog will be possible through the weekend as well. Temperatures will trend upward again next week but are not expected to be as hot as this week.
(Fri-Mon), 20/837 PM.
Another hot day across the region, with many daily record high temperatures and a few more monthly records broken. Please see the Record Report (LAXRERLOX) for more details. Temps will be cooling several degrees this weekend as slightly stronger onshore flow develops, and the upper ridge weakens. Even with this cooling trend, temperatures will still be 10-20 degrees above normal this weekend, with most interior areas climbing to between 80 and 90 degrees. The onshore trends and weakening high pressure aloft will create a favorable environment for a shallow marine layer to develop with a high potential for dense fog near the coast during the late night and morning hours, with the potential for dense fog advisories. The "coolest" day will be Saturday, then a slow warming trend will begin again Sunday and carry through next week. Based on the current forecast there's at least a 50% chance of needing heat advisories for inland coastal areas and valleys as early as Monday.
(Tue-Fri), 20/147 PM.
A second heat wave is expected next week as the high pressure ridge builds again just off the coast of southern California. Increasing northerly gradients will provide a temperature boost as well starting Monday night. Overall though, highs next week are expected to 3-5 degrees cooler than this week.
Between Monday and Wednesday temperatures are expected to climb 1-3 degrees each day, with Wednesday and Thursday likely being the peak of next week's heat wave with highs topping out in the mid 90s in the valleys and mid to upper 80s closer to the coast. These temperatures would qualify for heat advisories across most coast/valley areas starting as soon as Monday, including the Central Coast.
No rain still through Mar 30. There are increasing signs of at least some light rain around the beginning of April, though most solutions indicate less than a quarter inch in most areas.
21/0015z.
At 0004Z at KLAX, the marine layer depth was 400 feet. The top of the inversion was 2800 feet with a temperature of 29 degrees Celsius. For 00Z TAF package, high confidence in KPRB, KBUR. KVNY, KPMD and KWJF. For coastal sites, high confidence in forecasts through this evening, but low confidence tonight in development/timing of CIG/VSBY restrictions. If cigs develop along coastal sites late tonight into Saturday morning, there is a high probability of LIFR to VLIFR vsbys
KLAX, Overall, moderate confidence in 00Z TAF. Through this evening, high confidence in CAVU conditions. For later tonight and Saturday morning, moderate confidence in development of LIFR/VLIFR conditions, but low confidence in timing (could be +/- 3 hours of current forecasts). No significant easterly wind component is expected.
KBUR, High confidence in 00Z TAF as CAVU conditions are expected through the period.
20/1246 PM.
For the Outer Waters, moderate to high confidence in current forecast. Through tonight, high confidence in winds and seas remaining below Small Craft Advisory (SCA) levels. From Saturday through Wednesday, high confidence in a combination of SCA level winds and seas. Additionally, there is a 20-30% chance of GALE FORCE winds Saturday afternoon through Sunday and a 30-40% chance of GALE FORCE winds Wednesday.
For the Inner Waters north of Point Sal, moderate to high confidence in current forecast. Through tonight, high confidence in winds and seas remaining below SCA levels. From Saturday through Wednesday, there is a 50-70% 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 most of the southern Inner Waters, high confidence in winds and seas remaining below SCA levels through Wednesday. The only exception will be the western half of the Santa Barbara Channel where there is a 30-40% chance of SCA level winds Sunday afternoon and Sunday night.
For tonight and into Saturday morning, areas of dense fog are likely across all of the coastal waters.
Ca, NONE. PZ, Small Craft Advisory in effect from 6 PM Saturday to 3 AM PDT Sunday for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect from 3 AM to 6 PM PDT Saturday for zone 670. (See LAXMWWLOX). Gale Warning in effect from 6 PM Saturday to 5 AM PDT Sunday for zone 670. (See LAXMWWLOX). Small Craft Advisory in effect from 9 AM Saturday to 3 AM PDT Monday for zone 673. (See LAXMWWLOX). Small Craft Advisory in effect from 6 PM Saturday to 3 AM PDT Monday for zone 676. (See LAXMWWLOX).
