Marine Weather and Tide Forecast for Midway City, CA

DISCUSSION
FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

.SHORT TERM (Today through Friday)...
A weak low pressure system will move inland across California today with a stronger low pressure system approaching the California coast on Friday. Cooling will spread inland through Friday with the marine layer deepening onto the coastal mountain slopes. There will be cooling today with not much change on Thursday, then more cooling for Friday with Friday high temperatures as much as 8 to 12 degrees below average for the mountains and inland valleys.

The marine layer has deepened to 3000 to 3500 feet with widespread low clouds over the coastal waters extending inland across all of the valleys and into the lower portions of the Cajon Pass. The low clouds will once again extend inland and onto the lower coastal slopes of the mountains for tonight into Thursday morning, then onto more of the coastal slopes of the mountains for Thursday night into Friday morning.

There will be stronger onshore flow with stronger and gusty southwest to west winds for the mountains and deserts each late afternoon through late evening. The stronger gusts along and below the desert slopes of the mountains will mostly be 35 to 45 mph with gusts to 45 to 55 mph in the northern Coachella Valley below the San Gorgonio Pass.

.LONG TERM (Saturday through Tuesday)...
Saturday is expected to be the coolest day with a low pressure system moving inland across California. High temperatures will be mostly 10 to 15 degrees below average for the mountains, deserts, and valleys to locally 20 degrees below average for the higher elevations of the mountains. A slight chance of showers has been added to the forecast for late Friday night into Saturday evening.
Chances for measurable precipitation in the forecast are closer to the ECMWF and GFS MOS and the developmental NBM version 5.0.
NBM still appears to be too low with chances for measurable precipitation given the pattern. In any event, any precipitation will most likely be light.

Dry and warmer for Sunday through Tuesday as high pressure aloft strengthens off the California coast. High temperatures on Sunday as much as 8 to 12 degrees below average for the mountains, deserts, and valleys will warm to a few to around 5 degrees below average on Monday and a few to around 5 degrees above average on Tuesday. Tuesday high temperatures will range from the mid to upper 60s near the coast to the upper 70s to lower 80s for the Inland Empire with the lower to mid 90s for the lower deserts.
The marine layer will become shallower with night and morning low clouds and fog not spreading as far inland by Monday and Tuesday.

AVIATION
230945Z....
Coasts/Valleys/Coastal Mountain Slopes...Low clouds based at 1700-2200 feet MSL with tops to 3000ft MSL have spread efficiently across the coasts and valleys this morning, filled in through the coastal mountain slopes. VIS locally reduced to 4-6 SM within inland valleys, with obscuration where clouds intersect higher terrain. These clouds will scatter out from east to west 16- 18z and may not clear through the beaches until ~19z, especially in Orange County. Clouds spread back ashore after 00-03z Thursday with similar bases and inland extent.

Otherwise...Mostly clear through Tuesday evening.

MARINE
No hazardous marine conditions are expected through Sunday.

SKYWARN
Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions.

SGX WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...None.