LAS VEGAS (AP) — A powerful storm is being blamed for three deaths in California and one in Arizona. Forecasters said parts of both states could see more bad weather today. Winter storm warnings were posted for the mountains and the Antelope Valley foothills northeast of Los Angeles. And a flood watch was in effect in the Phoenix area, where several miles of the Loop 303 freeway in the western suburbs were closed due to flooding. The system iss expected to head east and reach the Atlantic coast by the middle of next week, but not before hitting the Southwest again with rain, snow and wind, forecasters said.