Marine Weather and Tide Forecast for Laguna Niguel, CA

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

Our typical marine layer low clouds have been patchy and slow to spread inland in areas tonight, likely due to lingering mid-level moisture brought here by southerly flow aloft around a large upper level ridge over the southern U.S. Locally, we continue to be sandwiched between ridges to our northwest and east, low pressure to our southwest, and broad troughing over the northern half of the country. This has lead to our present warm, somewhat humid but otherwise unremarkable weather.

Low clouds that have managed to move inland tonight will clear out by mid-morning, followed by mostly clear skies except for isolated cumulus popping up over the mountain ridges in the afternoon.
Above average morning low temps will turn to above average afternoon high temps again today, though today is expected to be a tad cooler than yesterday in most areas.

Conditions will be fairly similar day to day through at least mid next week, with only minor trends in temperature and depth and extent of the nightly/morning low clouds. Temperatures continue to cool slightly between today and Sunday for areas except the deserts, which will see similar temperatures. This will be followed by another mild warm up for Monday and Tuesday. Through this period, despite minor day to day changes, high temperatures will range from a few to about 5 degrees above average for coastal regions to 5 to 10 degrees above average for far inland areas, including the mountains and deserts. Low temperatures will similarly be 5 to 10 degrees above average most place, with parts of the mountains and deserts seeing lows up to about 15 degrees above average.

The somewhat messy flow pattern aloft is replaced with weak low pressure Wednesday, and temperatures will start to cool off. This trend will continue through late next week as a deeper trough moves in from the west. Among the global ensembles there are fairly significant differences in the strength of troughing aloft, which would affect the extent of cooling locally. This would likely bring temperatures at least back to around average, with the National Blend of Models suggesting high temperatures 5 to locally 10 degrees below average for late next week. This would also lead to a deepening of the marine layer, with clouds spreading further inland during nights and mornings mid to late next week.

AVIATION
130500Z
Coast/Western Valleys
Low clouds based 800-1200 ft MSL are pushing up to 15-20 miles inland. Cigs will be patchy through the night. Patchy FG (vis less than 1SM) and BR (vis 1-5SM) to reduce vis mainly for elevated coastal terrain and valleys east of the I-15 corridor (in SD County). Scatter to coast 15-18z Sat. Low clouds with similar bases return to the coast 02-05z Sun.

Mountains/Deserts...VFR conditions are expected through Saturday with high clouds AOA 10 kft MSL.

MARINE
No hazardous marine conditions are expected through Wednesday.

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

SGX WATCHES/WARNINGS/ADVISORIES
CA...Beach Hazards Statement through Monday evening for Orange County Coastal Areas-San Diego County Coastal Areas.

PZ...Beach Hazards Statement through Monday evening for Coastal Waters from San Mateo Point to the Mexican Border and out to 10 nm.