Moisture from Iselle, a former tropical storm, will leak into the Bay Area on Thursday, raising the chances for rare August rain showers.
The National Weather Service pegs the chance that measurable rain falls in the area on Thursday at 15%. So, it’s more likely that the influx of tropical air will fill the sky with a mixture of puffy and wispy clouds, setting the stage for a colorful sunset but also ruining visibility for the partial lunar eclipse set to peak between 7 and 10 p.m.
The clouds will reach the South Bay first, in the form of a mix of puffy cumulus and wispy high level variations. There is some forecast model disagreement on how quickly and how far north the cloud cover makes it on Thursday. The outcome will impact temperatures, but it looks like another warm day, with temperatures in San Francisco and around the bay that should peak in the 70s and the interior North Bay and East Bay heating up into the 90s. The air will likely feel a bit more muggy as well.
Iselle isn’t particularly close to California, centered about 1,000 miles away and continuing to move west. But an upper level storm system digging southward along the California coast will scoop up a sliver of tropical moisture from the storm system and send it toward the California coast on Thursday morning, with clouds and moisture continuing to flow into the state and spreading for the rest of Thursday and into Friday morning…