textproduct: San Diego

SYNOPSIS

The heat is on across SoCal as high pressure strengthens over the area through the weekend, leading to areas of moderate to major heat risk. The marine layer will stay thin through this period, where night and morning low clouds will cover the coast each day. The area of high pressure will weaken some into next week and may move further east. This pattern will bring slightly cooler weather with a minimal chance for rainfall over the mountains.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

The warming trend continues as the center of a growing high pressure system moves over Arizona today. The system will peak in intensity and be centered near the southern Colorado River Valley by Saturday. This is when we can expect the hottest temperatures with highs well into the 90s for valleys and mountains of Orange and San Diego Counties and over 115 degrees across the lower deserts. The high weakens slightly on Sunday, but temperatures will still remain hot away from the immediate coast.

With the hot temperatures, please severely limit or postpone outdoor recreation if you are in areas away from the coast, since temperatures will be well into the 70s and 80s by the mid-morning hours. For those without A/C, make sure to go to air conditioned areas and drink plenty of water. Warm and humid nights in the 60s/70s/80s will lead to less relief from the heat as well.

By early next week, the high weakens subtly. The position of where the high will go is still somewhat in flux. This will bring a degree or two of cooling for inland areas each day, but warm temperatures will still remain. Temperatures will stay near to slightly above normal by Monday onward next week. The high may go into a position that will bring in a subtle return of monsoonal moisture and greater humidity to the region, but rain chances still seem slim near 15% or less across our mountain areas by Wednesday into the latter half of next week.

Valleys/Mountains/Deserts

VFR conditions with increasing high clouds AOA 20000 feet MSL through Saturday morning.

MARINE

No hazardous marine weather is expected through Wednesday.

BEACHES

A southerly swell from now Tropical Storm Genevieve will generate surf of 4-6 feet with sets up to 7 feet for south facing beaches today and tonight before diminishing Saturday. This will create hazardous conditions for inexperienced swimmers. In addition, high tide tonight will near 6 feet. The combination of the high tides and elevated surf increases the risk of coastal flooding. For more details, check the Coastal Hazard Message.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

CA...Coastal Flood Advisory until 3 AM PDT Saturday for Orange County Coastal Areas-San Diego County Coastal Areas.

High Surf Advisory until 5 PM PDT Saturday for Orange County Coastal Areas-San Diego County Coastal Areas.

Heat Advisory until 8 PM PDT Sunday for Orange County Coastal Areas-San Bernardino County Mountains-San Diego County Coastal Areas.

Extreme Heat Warning until 8 PM PDT Sunday for Apple and Lucerne Valleys-Orange County Inland Areas-Riverside County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Mountains-San Diego County Valleys-Santa Ana Mountains and Foothills.

Extreme Heat Warning until 8 PM PDT Monday for Coachella Valley- San Diego County Deserts-San Gorgonio Pass near Banning.

PZ...None.