Not much change in high temperatures is expected for today followed by a gradual cooling trend through next weekend. Chances for showers will increase each day for Thursday through Sunday with chances for heavier rainfall increasing during next weekend. There could also be stronger and gusty wind for late Saturday through Sunday. Tides will remain elevated through much of this week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, UPDATED AVIATION DISCUSSION,
(today through Wednesday), High temperatures for the deserts into the mountains will warm a few degrees today with not much change for the coast and valleys. High temperatures for today for the coast and valleys will be mostly in the mid 70s to lower 80s and for the mountains in the 50s and 60s.
A gradual cooling trend will begin on Tuesday and continue through next weekend. High temperatures on Wednesday will be a few degrees below average near the coast and in the lower deserts to 4 to 8 degrees below average for the mountains and inland valleys. High temperatures on Wednesday for the coast and valleys will be mostly in the 70s and for the mountains in the mid 40s to mid 60s.
Coastal low clouds may return for tonight into Tuesday morning with greater spread into the valleys for Tuesday night into Wednesday morning. There will be increasing high clouds beginning around Wednesday.
(Thursday through Sunday), The cooling trend will continue through Sunday with high temperatures for inland areas next Sunday mostly 10 to 15 degrees below average. High temperatures for next Sunday will be mostly in the 60s to around 70 for the coast and valleys and for the mountains in the mid 30s to mid 50s.
The center of a closed low pressure center will be near the Pacific Northwest coast for Thursday through Sunday. A nearly zonal subtropical jet stream from the central and eastern Pacific into northern Baja will strengthen for Friday and Saturday, possibly transporting a low pressure into northern Baja into far southern California some time around late Saturday into Sunday. ECMWF ensemble output increases precipitable water values in far southern California to 1.2 to 1.4 inches on Saturday afternoon and evening, around 200 to 250 percent of normal.
For Thursday through Sunday, the chance for measurable rainfall will increase each day with chances for greater amounts increasing during next weekend. For Saturday morning through Sunday night, The chance of 1 inch or more of rainfall for the coast to the mountains is greater than 40 percent, and for San Diego County and the Riverside County mountains 50 to 60 percent. Chances for 2 inches or more is mostly 25 to 35 percent for the coast to the mountains with chances for 3 inches or more 15 to 25 percent.
261130z, Mostly clear and VFR conditions today and tonight across the region. Except for patchy coastal low clouds based 700-1200 feet MSL after 08Z Tuesday, leading to a 20-40% chance of cigs at coastal airports Tuesday morning.
No hazardous marine conditions are expected through Friday. Except for a few wind gusts exceeding 20 knots in the outer coastal waters late this afternoon and evening.
High tides during the late mornings will generate significant coastal flooding this week. Tides will be anywhere from 1.5 to 1.7 feet above astronomical predictions, likely raising high tides above 8 feet. A Coastal Flood Warning contains the details.
Ca, Coastal Flood Warning until 1 PM PDT Thursday for Orange County Coastal Areas-San Diego County Coastal Areas.
PZ, None.
