PHOENIX — After destructive storms moved through the region Sunday night, Phoenix recorded a slight cooldown Monday with a high of 108 degrees, but forecasters warn the monsoon pattern remains active and could produce more hazardous conditions this week.
Short-term outlook: outflow boundaries and dust concerns
Showers and thunderstorms that tracked across Arizona’s high country during Monday afternoon and evening left the Valley quieter for much of the day. However, weather models and local forecasts point to renewed storm activity originating in far southern Arizona and moving northward.
National and local forecasters say outflow boundaries — gust fronts of cooler air generated by intense southern storms — may evolve into dust storms as they push through parts of Pinal and Maricopa counties. There is also a chance those boundaries could collide over Phoenix, producing another round of strong or severe storms tonight.
- Timing: scattered showers and thunderstorms expected to persist overnight across much of Arizona.
- Primary threats: flash flooding, large hail and damaging winds in stronger cells.
- Secondary risk: outflow-driven dust storms in Pinal and Maricopa counties, which can reduce visibility quickly on area highways.
What to expect Tuesday through the weekend
Forecasters say Tuesday morning could bring lingering showers in the western half of Arizona, but skies are expected to clear by late morning. Phoenix should see a mainly dry day Tuesday, with only a low chance for isolated evening storms. Meanwhile, the high country will remain prone to afternoon and evening thunderstorms.
Looking beyond midweek, Wednesday and Thursday are forecast to be cloudier and cooler, with shower and thunderstorm chances during daytime and evening hours. Drier conditions are expected statewide by Saturday and Sunday.
| Day | Phoenix outlook |
|---|---|
| Monday | High about 108°F; quieter after weekend storms |
| Tuesday | Lingering western showers morning; mainly dry in Phoenix |
| Wed–Thu | Cloudier, cooler; afternoon/evening shower chances |
| Sat–Sun | Drier statewide |
Public safety and heat guidance
Emergency responders and meteorologists emphasize that storm hazards — particularly flash flooding and wind-driven debris — can be as dangerous as heat in this season. The Scottsdale Fire Department provided heat safety definitions and first-response steps to help residents differentiate and respond to heat emergencies. Key signs of heat-related illness include heat cramps and exhaustion; the department highlighted life-threatening heat stroke symptoms.
"Heat Stroke: Elevated temp. +103degrees, confusion/irrational behavior, dry/hot skin, rapid shallow breathing, rapid weak pulse (shock), seizures, unconscious"
Advice shared with the public includes moving an affected person into shade or a cool spot, applying cool, wet cloths to the neck, groin, armpits and head, using a fan and providing small sips of water if the person is alert. For muscle cramps, rest and hydration are recommended.
Motorists should be especially cautious if dust or blowing debris reduce visibility. Drivers encountering a dust storm should pull off the road, turn off headlights and hazards, and wait until visibility improves. Those with outdoor plans should monitor conditions through local forecasts and weather apps.
Residents can check updated conditions and live radar through local television weather pages and mobile weather applications to track the timing and strength of incoming storms. With the monsoon remaining active, forecasters urge vigilance through the week as conditions can change rapidly.
