textproduct: San Diego

SYNOPSIS

Drying and gradual cooling is expected through the weekend with HeatRisk for most areas below Moderate by the end of the weekend. Patchy night and morning coastal low clouds will increase in coverage and spread locally into the western valleys at times for the weekend into early next week. High pressure to the east is expected to bring a warming trend for the latter half of next week.

SHORT TERM (Today through Sunday)

High pressure over southern California will weaken as a low pressure system moves southward off the British Columbia coast today and inland through the Pacific Northwest on Saturday. This will strengthen the onshore flow across southern California with drier southwest flow aloft. Cooling began to spread inland on Thursday and that will continue through the weekend. High temperatures will be a few degrees cooler for most areas for today and again on Saturday with a little greater cooling for the valleys of around 5 degrees on Sunday.

High temperatures for today will still be 5 to locally 10 degrees above average with high temperatures ranging from the upper 70s to mid 80s near the coast to the 90s for the Inland Empire with 106 to 110 for the lower deserts. While not quite as hot as recent days, Moderate HeatRisk will continue for the valleys and inland coastal areas and a Heat Advisory has been issued for these areas through 8 PM today.

For Sunday, high temperatures near the coast will be near average with the lower deserts a few degrees above average with the valleys around 5 degrees below average. High temperatures on Sunday will range from the mid to upper 70s near the coast to the upper 80s and lower 90s for the Inland Empire with 102 to 106 for the lower deserts.

Low temperatures will cool as the atmosphere cools and inland areas dry with low temperatures on Sunday still a few degrees above average for the coast into the valleys and around 5 degrees above average for the mountains and deserts. Low temperatures on Sunday for the coast and valleys will be mostly in the 60s with a few of the cooler protected valleys in the mid 50s.

With drying of mid and higher level moisture, patchy night and morning coastal low clouds will increase in coverage and spread locally into the far western valleys at times over the weekend as the marine layer slowly deepens.

LONG TERM (Monday through Thursday)

Low pressure near the California will weaken early next week. High pressure to the east may begin to expand across the area for the latter half of next week. Temperatures will continue to cool for early next week with Tuesday high temperatures ranging from the 70s near the coast to the 80s for the Inland Empire with the lower deserts around 100. This will be followed by a warming trend for Wednesday through Friday of next week, but with increase spread in just how much warming may occur. The NBM 50th percentile would warm temperatures to around average for Friday of next week with high temperatures for next Friday ranging from the mid 70s to lower 80s near the coast to the upper 80s and lower 90s for the Inland Empire with 100 to 104 for the lower deserts. Dry weather is expected to continue for Monday through Thursday of next week.

AVIATION

110530Z...Coast...Patchy low clouds and fog will gradually develop overnight with bases around 600-900 feet MSL and vis 1-5SM, lowest on coastal mesas. Cigs most likely 10-16Z, and around KSAN. Low clouds to return after 02Z Friday eve with more uniform and expansive coverage. Bases around 900-1200 feet MSL.

Otherwise, SCT clouds above 15 kft and VFR conditions through Friday with cumulus clouds around 10 kft over mountains 19-00Z.

MARINE

No hazardous marine conditions are expected through Tuesday.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

CA...Heat Advisory until 8 PM PDT this evening for Orange County Inland Areas-San Bernardino and Riverside County Valleys- The Inland Empire-San Diego County Coastal Areas-San Diego County Valleys.

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

PZ...None.