Southern California Weather Force has issued a Long Range Weather Watch effective August 10th through August 25, 2025 with the increased monsoon flow.
Tropical activity will be on the increase during the watch period. Southern California Weather Force’s Long Range Storm Risk Model is showing notable levels of storm activity, a first for this season across half of the state. Storm activity looks to be linked with the heatwave this week, which is known as a monsoon heat-blast. These usually happen when a ridge of high pressure builds in, the nominal four corners ridge. Given the long range model, it looks as if moisture will be entrained inside the ridge, bringing storms off the mountains and desert areas, and even sometimes through areas Los Angeles eastward for Orange County, San Diego County, Imperial County, Inland Empire, and the High Desert …
This type of pattern is usually when storms off the mountains bring heavy rain to the valleys of San Diego and the entire Inland Empire zones, especially along the Elsinore Convergence Zone …
Raiden Storm
Master General Meteorologist