Before that, however, we have to deal with Wednesday, a day with a warm front hovering over our area. Readings should reach into the lower 80s in much of the area. There will be a pretty good chance of showers or thunderstorms spreading from the west in late afternoon and continuing overnight, as the warm front slowly works its way north to the Illinois-Wisconsin border by Thursday morning.

Source: Los Angeles Times September 19, 2018 00:22 UTC