18/1129 PM.
There will some warming today and Wednesday with lighter Santa Ana winds. Beginning Thursday there will be a return to cooling May Grey conditions which will last through the weekend.
(tdy-Thu), 19/1201 AM.
There will be another day of Santa Ana winds today, but they will be weaker than ydy's as the sfc gradients are weaker and there is a little less upper support. Still enough upper support to bring 40 mph gusts to the mtns and 30 mph gust to the vly areas around the LA/VTA county line. The marine layer has been greatly reduced by the offshore event and this along with continued offshore flow will result in a noticeable warm up of 2 to 4 degrees across the csts and 3 to 6 degrees across the rest of the area. Look for mid 70s to lower 80s across the csts with mid to upper 80s in the vlys. Humidites will be in the lower teens with local 8 to 12 percent readings. This conditions will bring widespread elevated to locally brief critical fire weather conditions to the lower mtns elevations and vlys areas. A return to onshore flow and a weak eddy will bring some low clouds to the coasts on Wednesday morning. Skies, otherwise, will be sunny. The gradients will be on the light side and there will be no wind issues. The coastal temps will not change much, but the rest of the area will see a couple more degrees of warming. A few 90 degrees readings are possible in the warmest vly locations.
Continued onshore trends will bring moderate onshore flow to the area on Thursday. The marine layer clouds will respond in kind and most of the coasts and some of the lower vlys will wake up to low clouds. The onshore flow will also delay clearing to the late morning. There will be a little stronger seabreeze as well as a return to gusty afternoon winds in the Antelope Vly. A multi day cooling trend will kick off with max temps falling 1 to 3 degrees across the csts/vlys (max temps may rise another degree or two across the far interior)
(Fri-Mon), 19/1226 AM.
May Grey will return during the xtnd period. At the upper levels there will be fairly weak flow. At the sfc there will be steadily increasing onshore flow. By the weekend there will be moderate to strong onshore flow.
A more robust marine layer will likely develop each night through morning. The clouds will push a little deeper into the vly each day as well. By the weekend some beaches will struggle to clear. The increased onshore flow to the east will produce moderate southwest winds across the Antelope Valley and foothills during the weekend.
Fridays will see the biggest drop in temps with most areas falling by 4 to 6 degrees. A few more degrees of cooling are slated for Saturday and then little change is forecast for Sunday and Monday's temps. Highs over the weekend will range from the upper 60s to mid 70s across the csts with upper 70s to mid 80s for the vlys. As is typical with strong onshore flow, the csts/vly temps will be below normal while the interior temps will be a few degrees over normal.
19/0903z.
At 0840Z at KLAX, the marine layer was 1900 ft deep, with an inversion up to 3400 ft and a maximum temperature of 17 C.
Very good confidence in CAVU TAFs.
KLAX, Good confidence in CAVU TAF. Any east wind component will be AOB 4 kt.
KBUR, Good confidence in TAF. Wind speeds may be off by up to 5 kts and 30 degrees during peak winds.
19/201 AM.
For the Outer Waters, high confidence in current forecast. Today through Friday, winds and seas are expected to remain below SCA levels, except for localized pockets of near SCA NW winds during the afternoons and evenings.
For the Inner Waters north of Point Sal, high confidence in current forecast. There is a 40 percent chance of SCA winds on Wednesay afternoon/evening. Otherwise through Friday, winds and seas are expected to remain below SCA levels.
For the Inner Waters south of Point Conception, high confidence in current forecast. Local SCA winds may occur again later today and Wednesay evening off the coast of Point Dume, across the San Pedro Channel, and in the Santa Barbara Channel. Otherwise through Friday, winds and seas are expected to remain below SCA levels.
Ca, NONE. PZ, NONE.
