Marine Weather and Tide Forecast for Huntington Beach, CA

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

Weak troughing will continue over the western United States for today and Thursday. Heights aloft are expected to rise, which will allow for 5 to 10, locally up to 15 degrees of warming compared to yesterday. A few additional degrees of warming is expected for inland locations Thursday. The marine layer is expected to get a little shallower for Thursday and Friday, but low clouds are still expected to reach into portions of the Inland Empire. On Friday the troughing pattern is expected to deepen slightly over Southern California, which will bring cooler conditions, a deepening marine layer, and an uptick in westerly winds over the mountains and deserts.

A deeper troughing pattern is expected for the weekend as an upper low pressure system digs south along the West Coast. There remain some slight differences in how far south the trough digs but there is fairly high confidence in cooler weather, increased cloud coverage, and stronger winds over the mountains and deserts. NBM chances for wind gusts reaching or exceeding 50 mph are 40 to 60 percent for the desert mountain slopes and into the deserts, with chances closer to 90 percent in wind prone locations in those geographic areas. A ridge of high pressure will be set up over the Eastern Pacific for the weekend. Model guidance is suggesting subtropical moisture will be pulled over the ridge and into Southern California as the aforementioned trough digs south. The increased moisture will bring chances of precipitation to the area. Due to the predominately northwesterly flow, highest chances of precipitation are along and west of the mountains for San Diego county, with second highest chances for precipitation on the coastal slopes of the San Bernardino and Riverside county mountains. NBM chances of rainfall totals exceeding 0.10" Saturday night through Sunday for San Diego county and Riverside/San Bernardino mountains are 15 to 30 percent, with the highest chances on the coastal mountain slopes in San Diego county. Elsewhere chances are 10 percent or less. The NBM reasonable worst case scenario for total rainfall accumulations between Saturday evening and Sunday is 0.20" for San Diego coast/valleys and San Bernardino/Riverside coastal mountain slopes.
For the San Diego County mountain slopes, reasonable worst case scenario for total rainfall is 0.40".

Dry conditions are expected to return to the area by Monday, as the trough moves east and upper level ridging inches closer to the West Coast. By Tuesday, the majority of ensemble clusters show ridging over the West Coast. Current forecast follows the NBM with warming temperatures for Monday and Tuesday. By Tuesday, high temperatures will be around average for the mountains and deserts and around 4 to 8 degrees above average for the coast and valleys.

AVIATION
141530Z
Coast/Valleys
SCT low clouds this morning should quickly transition to widespread SKC by 18z. Low clouds redevelop from south to north after 07z Thursday with bases 1500-2000 ft MSL.
Clouds should remain over the coasts and western valleys, likely not reaching KONT, and scattering to the coastline around 16-18z.

Mountains/Deserts
Mostly clear today and tonight. Elevated westerly winds have diminished, but occasional gusts 25-35 kt possible through 18z. Otherwise, typical flow pattern through Thursday.

MARINE
No hazardous marine conditions are expected today through Saturday.
Stronger winds and higher seas are expected late Saturday into 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.