PHOENIX (3TV/CBS 5) – It’s a First Alert Weather Day as a strong winter storm moves into Arizona. Expect desert rain, mountain snow, strong winds and cooler temperatures. An atmospheric river event transitions out of California and into Arizona throughout the day. Rain chances begin in Western Arizona this morning, spreading east across the state this afternoon and evening. Southwestern Arizona is under a Flood Watch starting this morning and continuing into this evening, while the Valley metro area is under the same Flood Watch from this afternoon through Wednesday evening. Wednesday is also a First Alert weather day.