DISCUSSION: As a complex series of weak low-pressure systems continue to slowly sliding east and northeast with time, showers and embedded thunderstorms will continue to impacting parts of the Southwestern United States this evening and during the overnight hours. The main culprit for these widespread pockets of showers and storms is the result of the onset of the North American monsoon which is primarily an early Summer to mid/late Fall-time atmospheric phenomena. The North American monsoon is the result of the stronger surges of deeper/moisture-laden air off of both the Eastern Pacific Ocean as well as the Gulf of California (located between the Southwestern United States and the Baja Peninsula of Southern California and Northern Mexico). If you live across Southeastern Arizona as well as surronding areas, expect these rainy conditions to persist for the next 12 to hours periodically! To learn more about other high-impact weather from across North America, be sure to click here!