Full Breakdown
Phoenix Faces Severe Thunderstorm Warnings Amid Monsoon Season
9/19/2025, 8:54:13 PM
Severe Thunderstorm Warnings Issued
The National Weather Service (NWS) has issued a severe thunderstorm warning for Maricopa County, effective until 8:15 p.m. on September 19, 2025. The warning indicates potential wind gusts of up to 60 mph and the possibility of quarter-sized hail. Rainfall has already been recorded in areas such as Peoria and Glendale, with approximately 0.04 inches noted prior to 8 p.m. The storm initially developed south of Buckeye, with predictions of storm activity beginning as early as Wednesday night. Mark O’Malley, a meteorologist with the NWS, emphasized that the chances for precipitation were significantly higher on Thursday and Friday, as the region has experienced one of its driest monsoon seasons in recent history, accumulating only 0.68 inches of rain thus far.
Impact of Tropical Storm Mario
Moisture from the remnants of Tropical Storm Mario is contributing to the increased chances of rain across Arizona. This tropical moisture surge is expected to enhance storm activity through September 19, with rain chances in Phoenix ranging from 40% to 60% during this period. Areas in western Arizona and southeast California are anticipated to experience the heaviest rainfall first. The influx of moisture has raised humidity levels to 150% to 200% above normal, creating conditions conducive to heavy downpours and localized flash flooding.
Rainfall Totals and Flooding Risks
As of September 19, rainfall totals have varied significantly across the Valley. Areas such as Gold Mountain received 1.81 inches, while Carefree recorded 1.34 inches. The NWS has issued flash flood warnings for various regions, including Tucson, where 1 to 2 inches of rain have already fallen, leading to life-threatening flash flooding conditions. Residents are advised to avoid flooded roadways and seek higher ground if necessary.
Official Statements & Responses
Meteorologist Matt Salerno noted, “We’re going to see increasing moisture starting in the middle of the week. It’s going to feel muggy outside again. We’ll start to see rain chances increase.” He also expressed hope for a substantial amount of rain to help alleviate the dry conditions, although it appears that Phoenix will still finish the monsoon season below normal levels.
Criticism & Opposition
Despite the potential for beneficial rainfall, some residents express concern over the unpredictability of monsoon storms and the associated risks of flash flooding. Lisa Blyler, from the Maricopa County Flood Control District, highlighted the challenges posed by the ground's inability to absorb rain during this time of year, stating, “The ground this time of the year is like concrete; it can’t soak up any rain, so it just shoots right off.”
What's Next
As the week progresses, the NWS anticipates a drying trend over the weekend, with storm chances tapering off. However, additional disturbances may bring isolated thunderstorms into early next week, followed by a return to hotter conditions, with temperatures expected to rise back into the low 100s by Tuesday. Residents are encouraged to stay informed about weather updates and prepare for potential flooding as the monsoon season continues.
