Looking at a gorgeous weekend out there with near-normal temperatures and dry conditions for our last day of spring, summer officially arrives tomorrow at 1:24 AM. Expect mostly clear skies this evening light winds as lows cool to the 40s. Little change for Father's Day with highs in the 70s, west winds 5-15 mph during the afternoon. High pressure will strengthen across the region next week, leading to our first summer heatwave of the season as temperatures reach the mid-80s. This ridge may also set up over Arizona, which puts SoCal in a semi-favorable position for a southerly flow, drawing monsoon moisture into the area. This may lead to some afternoon clouds with a few thundershowers possible around Wednesday through Friday. Temperatures will remain above average through next weekend, with drier conditions returning as a southwest flow aloft develops.