Heat Warning Expires Tonight, Monsoon Moisture Arrives This Weekend
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The Extreme Heat Warning for San Diego County's deserts and mountains — in effect since July 7th, with lower-desert highs near 115 degrees — expires tonight at 8:00 p.m. PDT. Inland valleys remain in the 90s through today before some cooling this weekend. At the coast, Friday's high reaches 74 with a low of 64; the marine layer is expected to clear by mid-morning. Air quality remains poor, and health officials advise anyone with asthma, heart conditions, or age-related vulnerability to limit outdoor exposure.
The larger weekend weather story is monsoonal moisture moving into the region. Humidity increases countywide Saturday and Sunday, with the highest probability of thunderstorms arriving Monday afternoon in the mountains and deserts and storm chances extending through midweek. Flash flooding and lightning risk are elevated for backcountry areas. Even coastal zones will feel the humidity shift in what forecasters describe as the classic San Diego summer monsoon pattern.
Beach-goers should note that astronomical high tides of 7.0 to 7.2 feet are forecast July 12th through 14th. Combined with a south swell generating 4-to-6-foot surf, coastal flooding is possible in low-lying beach areas and parking lots during evening high tides Saturday and Sunday.
Looking ahead on the calendar: Del Mar's summer racing season opens July 17th and runs through November 29th. On July 14th, Mason Miller takes the mound at the All-Star Game in Philadelphia — and the stories carrying forward from this week include Larry Millete's sentencing date once set, the closing public comment window on SANDAG's SB 79 map, the San Ysidro School District's fiscal picture before August, unresolved county inspection rights at the now-federally owned Otay Mesa facility, and the Santee November ballot campaign around a proposed 1 percent sales tax measure.