Monsoon Surge Brings 50% Storm Risk to Phoenix on First Alert Day

Arizona forecasters say monsoon activity is ramping up across the Phoenix metropolitan area, prompting a First Alert Day for Monday. The National Weather Service in Flagstaff and local TV meteorologists report isolated thunderstorms already developing around the Valley, with radar detecting pockets of intense lightning southwest of the city during the morning commute. Storm coverage is expected to increase through the afternoon and evening, with a 50% chance of thunderstorms capable of producing gusty winds, blowing dust and brief but heavy downpours. Daytime temperatures are trending lower but will still reach about 104°F before clouds and rain move in. Officials advise motorists to be prepared for rapidly changing conditions, including sudden dust reductions in visibility, and to secure outdoor items that could become projectiles in strong outflow winds. The current active pattern is forecast to persist through the week, offering additional opportunities for scattered rainfall across central Arizona.