Marine Weather and Tide Forecast for Irvine, CA

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

Satellite shows an area of low pressure off the coast of central Baja California this afternoon. The system is contributing to the easterly flow aloft, which is giving breezy conditions to the mountains this morning. This will continue to spread all the way to the coast into the afternoon. Easterly winds will favor the greatest winds across the the Riverside and San Diego County coastal slopes and valleys through the early evening hours. Widespread winds of 25- 45 MPH will be expected across the valleys, 20-30 MPH near the coast, and locally near 55 MPH along the coastal mountain slopes.
Hot temperatures are also out there this afternoon with San Diego shooting into the mid to upper 80s, potentially breaking the record high of 85 degrees for the day.

Hi-res models show clouds from the low pressure system moving northward into our region this evening into the overnight hours, mainly across San Diego County and central Riverside County. Slight increases in moisture are noted on Sunday night across southern San Diego County, but drier air at the surface will make it difficult for rain to reach the ground. A better chance for light rainfall will be by Monday afternoon and evening as the area of low pressure moves inland across Baja California. Whatever falls will be light with most areas seeing a few hundredths at best, some areas over one tenth of an inch in the southern parts of the SD Co mountains.
As the system begins to push east, we can expect much cooler weather conditions west of the mountains, with slight cooling across the mountains and deserts. Confidence is pretty high for areas near the coast to stay in the upper 60s with some spots in the lower deserts staying in the 70s.

A strong area of high pressure that has been sitting off the coast over the past couple of days will begin to move eastward over our area by Wednesday, anchoring itself over us into next weekend. This system will be a warm one as 850mb temps soar around 10C above normal. near 15-20+ degrees above normal will stick around by Thursday into at least next weekend. As of now, the warmest days will be on Thursday and Friday where NBM shows moderate to high chances in seeing highs over 95 degrees from the Inland Empire, OC/SD valleys, and the lower deserts. This will lead to increased heat risk for those that work outdoors, elderly, etc., so make sure to plan for the hot weather ahead. The high may weaken slightly next weekend, with a few degrees of cooling, but dry and warm weather looks to prevail for the foreseeable future.

AVIATION
081815Z
Coast/Valleys/Coastal Slopes
VFR conditions expected through the TAF period. Cloud cover will begin to increase after 21Z. E/NE winds have picked up and are gusting around 20-35 kts in the lowlands and 35-50 kts along coastal slopes and downwind of passes. KONT is already seeing gusts around 30 kts with moderate confidence in gusts exceeding 35 kts, but are unlikely to exceed 40 kts today. Winds will begin to shift to southerly tonight 23Z-02Z with gusts expected to continue at coastal TAF sites through 04-09Z Monday. Moderate to strong up/downdrafts can be expected west of the mountains through the TAF period. Precipitation chances increase for San Diego County after 06z Mon, with little to no impact expected for any TAF sites.

Deserts/Desert Slopes
VFR conditions expected through the TAF period. Gusts in adjacent slopes will remain elevated through 02Z Monday. NE surface winds have increased, though gusts in the Coachella Valley are likely to remain below 30 kts. Winds will decrease gradually after 00z Mon.

MARINE
Intermittent gusts near 20 knots are expected today.
Otherwise, no additional hazardous marine conditions are expected through Thursday.

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

SGX WATCHES/WARNINGS/ADVISORIES
CA...Wind Advisory until 5 PM PDT this afternoon for Orange County Inland Areas-Riverside County Mountains-San Bernardino County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Mountains-San Diego County Valleys-San Gorgonio Pass near Banning-Santa Ana Mountains and Foothills.

PZ...None.