Rare September rain slated for Southern California, with some under flood watch

Things to Do in L.A. Tap to enable a layout that focuses on the article. Commuters wait for a train against dark skies at the MTA's Expo/Bundy station in Culver City on Thursday. An unseasonable shift in weather is bringing the chance of showers and thunderstorms across Southern California, prompting some concerns about flooding as temperatures also drop well below average for mid-September. In much of the Los Angeles area, the system is expected to bring only light rain or drizzling Thursday and Friday, but there is a possibility for pockets of thunderstorms that could bring heavier rain. The greatest chance for thunderstorms is in the mountains, including along the Interstate 5 corridor and across the San Gabriels, according to Bryan Lewis, a National Weather Service meteorologist in Oxnard. "We're looking at mostly less than a tenth of an inch, maybe up to a quarter of an inch in the mountains," Lewis said.