PELHAM, Ala.—Terrified drivers climbed out of swamped cars and muddy floodwater flowed through neighborhoods after a stalled weather front drenched Alabama for hours, leaving entire communities underwater Thursday and killing at least two people with still more drenching storms to come. Dozens of people had to be rescued Wednesday night in central Alabama, where the National Weather Service said as much as 13 inches of rain fell, and a south Alabama town temporarily lost its main grocery store when a creek came through the doors of the Piggly Wiggly. Near the coast, heavy rains caused sewage to bubble out of underground pipes. The forecast called for more deluges in areas including metro Birmingham, which was under a flash flood watch, and meteorologists predicted another wet day for most of the state, along with parts of Florida, Georgia, and Tennessee. As much as 5 more inches of rain was possible through …