As San Diego braces for a heat surge, the National Weather Service (NWS) San Diego forecast predicts a temperature spike. Highs today are set to reach 5 to 10 degrees above the norm, especially searing in inland areas. While coastal residents might enjoy the upper 70s to borderline 90s, inland valleys are prepping for low 100s, and low desert areas might endure scorching 110 to 114 degrees. The NWS also cautions that an Excessive Heat Warning remains firmly in place for the low deserts.
Come Monday, a minor respite is on the horizon, though temperatures will still linger above average. The NWS warns of a "prolonged heat wave" starting Tuesday, intensifying as the week progresses. High pressure from the east is expected to exacerbate the swelter, culminating in potentially the week's hottest day on Friday. Radiating merely a 10 percent chance of showers and thunderstorms, the southern regions of San Diego could see some light showers today, albeit chances are petering out.
The Area Forecast Discussion released by the NWS details how an approaching upper trough offers brief cooling. However, the upper level high off the West Coast will gradually shift and intensify. This atmospheric shuffling means a day-by-day incremental roast, with an unsettling 22 percent chance that Palm Springs could hit a blistering 120 degrees by week's end.
Low clouds in the night and morning, along with the faithful marine layer, will try to keep coastal and some valley areas moderately cooler. The Excessive Heat Watch is extended to include the high deserts from Tuesday through Friday. Amidst the relentless heat, the marine layer's persistence and daily onshore flows are vital in tempering the coastal blaze. Regarding aviation, coastal regions should anticipate low clouds returning after 06Z Monday with less coverage.
Boaters and marine enthusiasts have good news. No perilous marine conditions are expected through Thursday. To provide reports or for more information, the NWS Skywarn program does not currently seek activation, yet weather spotters are urged to report notable weather conditions as they develop.
