Arizona Weather Update: Air Quality and Flood Risks Increase
August 11, 2026 — Several weather-related concerns are affecting Arizona, ranging from an Air Quality Alert across Maricopa County and the Phoenix metropolitan area to a broad Flood Watch covering portions of Southeast Arizona. A Flood Advisory is also in effect near Brawley Wash in north-central Pima County, while a power outage is being reported in Graham County.
With Arizona’s monsoon season capable of producing sudden downpours, thunderstorms and rapid runoff, residents should remain alert to changing conditions.
Air Quality Alert Covers Maricopa County and Phoenix Metro
An Air Quality Alert is affecting Maricopa County, including the Phoenix Metro Area, through Tuesday.
Poor air quality can become more noticeable during periods of stagnant weather, increased dust, smoke or other airborne pollutants. People who are sensitive to air pollution may want to limit prolonged outdoor exposure when conditions deteriorate.
Residents in the Phoenix area should monitor local air-quality information and be prepared for conditions to change throughout the day.
What Residents Can Do
Consider reducing strenuous outdoor activity if air quality worsens. Keeping indoor air clean by closing windows and limiting the introduction of outdoor pollutants can also help.
Drivers should use additional caution if dust or haze reduces visibility.
Flood Watch Expands Across Southeast Arizona
A significant Flood Watch is affecting portions of Southeast Arizona, where thunderstorms and heavy monsoon rainfall could produce flooding.
The watch includes several mountain ranges, valleys and populated areas, including:
- Catalina and Rincon Mountains
- Chiricahua Mountains
- Dragoon, Mule, Huachuca and Santa Rita Mountains
- Eastern Cochise County below 5,000 feet
- Galiuro and Pinaleno Mountains
- Tucson Metro Area
- Upper Gila River Valley
- Upper San Pedro River Valley
- Upper Santa Cruz River Valley and Altar Valley
Why Southeast Arizona Is Vulnerable
Monsoon thunderstorms can drop large amounts of rain over a relatively short period. Mountain terrain can funnel runoff into washes, creeks and low-lying areas, creating dangerous conditions downstream even when rainfall at a particular location appears limited.
Urban areas such as Tucson can also experience rapid runoff when heavy rain overwhelms drainage systems.
Tucson Metro Area Faces Flooding Potential
The Tucson Metro Area is included in the Flood Watch, making it important for residents to keep an eye on developing thunderstorms.
Heavy rainfall can quickly create water-covered roadways, especially in areas near washes and drainage channels.
Never drive through a flooded roadway. Water depth can be difficult to judge, and moving water can sweep vehicles away.
Flood Advisory Issued for Brawley Wash
A Flood Advisory is affecting the Brawley Wash in north-central Pima County.
Residents near the wash and surrounding drainage areas should remain alert for rising water and runoff. Even when an advisory is less serious than a warning, conditions can change quickly during monsoon storms.
Avoid walking, biking or driving through flowing water.
Graham County Power Outage Adds Another Concern
A power outage is being reported in Graham County, adding another issue for residents in the region.
During active weather, outages can become more difficult to manage if thunderstorms, strong winds or heavy rainfall affect infrastructure.
Residents experiencing an outage should use caution around downed power lines and report hazards to the appropriate utility provider. Never approach or touch a downed electrical line.
Monsoon Storms Can Change Conditions Quickly
Arizona’s summer monsoon pattern can produce highly localized weather. One neighborhood may receive heavy rainfall while another location nearby receives very little.
That makes radar monitoring especially important during periods of active thunderstorms.
Watch for:
- Rapidly darkening skies
- Heavy rainfall
- Lightning
- Strong wind gusts
- Blowing dust
- Rising water in washes
- Water covering roads
- Sudden changes in visibility
Arizona Residents Should Stay Weather-Ready
The combination of an Air Quality Alert in the Phoenix area, a broad Flood Watch across Southeast Arizona and a Flood Advisory near Brawley Wash means residents should stay informed throughout the day.
Those traveling through mountain areas, washes or low-water crossings should be particularly cautious because rainfall upstream can cause water levels to rise rapidly.
Stay Connected With Radar Watch HQ
Radar Watch HQ continues to track developing weather threats across Arizona and nationwide. Follow the latest weather alerts, radar developments and severe-weather updates so you can make informed decisions as conditions change.
Stay weather-aware, stay prepared and never underestimate rapidly changing monsoon conditions.
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Radar Watch HQ Top 5 Essential Emergency Preparedness Picks
Whether you’re preparing for severe thunderstorms, flash flooding, hurricanes, wildfires, or extended power outages, these five emergency essentials can help keep your household safer when severe weather strikes.
A portable power station provides reliable backup electricity during outages, allowing you to power phones, medical devices, laptops, lights, small appliances, and communication equipment without fuel.
Best for:
- Extended power outages
- Severe thunderstorms
- Hurricanes
- Winter storms
- Wildfires
2. Flood Protection Barriers & Sandless Flood Bags
Flood barriers help divert or absorb water before it enters garages, doorways, and low-lying areas. They deploy quickly and can help reduce property damage during flash flooding.
Best for:
- Flash Flood Warnings
- Heavy rainfall
- River flooding
- Coastal flooding
3. Rechargeable LED Flashlights
Bright, dependable flashlights are essential when the power goes out. Rechargeable or solar-powered models provide long-lasting illumination for navigating safely indoors and outdoors.
Best for:
- Overnight power outages
- Emergency evacuations
- Storm damage inspections
Keep phones, tablets, weather radios, and USB-powered devices charged when the electrical grid is unavailable. A solar power bank offers an additional charging option during prolonged emergencies.
Best for:
- Communication during outages
- Emergency weather alerts
- Travel and evacuation
A NOAA Weather Radio delivers official weather alerts directly from the National Weather Service, even when cellular networks or internet service are unavailable. It remains one of the most dependable ways to receive life-saving warnings.
Best for:
- Tornado warnings
- Severe thunderstorm warnings
- Flash flood warnings
- Hurricane alerts
- Winter storm emergencies
Why Radar Watch HQ Recommends These Essentials
At Radar Watch HQ, preparedness is just as important as staying informed. These five emergency essentials can help you stay connected, protect your property, and safely navigate severe weather events. Having supplies ready before storms arrive allows you to respond quickly when warnings are issued and conditions begin to deteriorate.
