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.
(tdy-Mon), 20/128 PM.
Afternoon temperatures remain very close to the last couple of days, as expected. This will be the last day of record temperatures in this current heat wave, though we're not completely done with the hot weather. Temps will be cooling several degrees this weekend as slightly stronger onshore flow develops, enough to end the 5 day string of heat advisories and warnings. However, highs will still be 10-15 degrees above normal this weekend as high pressure still remains quite strong. 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 night and morning hours. 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.
20/1510z.
At 1500Z at KLAX, there was a surface-based inversion. The top of the inversion was 2400 feet with a temperature of 28 degrees Celsius.
For 18Z 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.
KLAX, Overall, moderate confidence in 18Z TAF. Through this evening, high confidence in CAVU conditions. For 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 18Z 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, Heat Advisory remains in effect until 8 PM PDT this evening for zones 38-87-340-341-343-344-346>350-354-355-362-366-367-549-550. (See LAXNPWLOX). Heat Advisory in effect until 8 PM PDT this evening for zones 38-87-343-344. (See LAXNPWLOX). Extreme Heat Warning in effect until 8 PM PDT this evening for zones 88-342-345-351>353-356>358-368>376-378>380-548. (See LAXNPWLOX). PZ, Small Craft Advisory in effect from 2 PM Saturday to 3 AM PDT Sunday for zone 645. (See LAXMWWLOX). Small Craft Advisory in effect from 2 PM Saturday to 3 AM PDT Monday for zones 670-673. (See LAXMWWLOX). Small Craft Advisory in effect from 5 PM Saturday to 3 AM PDT Monday for zone 676. (See LAXMWWLOX).
