Severe Storms risk in Arizona

Monsoon season in Maricopa County

Your roofer calls after a July storm and says the shingles on the west side are gone. That's when Arizona homeowners start asking about severe storms. In Arizona, the risk isn't hurricanes or blizzards. It's the monsoon — a summer pattern that runs roughly July through September. Storms build over the Mogollon Rim and roll into Phoenix, Tucson, Yuma, and the high country around Flagstaff and Prescott. The National Weather Service calls it the North American Monsoon. You'll hear locals just say monsoon.

What makes Arizona different is the ground. It's hard, dry, and often sloped. Rain from a severe thunderstorm doesn't soak in. It runs off. That's why you see flash floods in Maricopa, Pinal, Pima, and Yavapai counties, especially in washes and near the Salt and Gila rivers. A storm that drops two inches in an hour can turn a dry wash into a wall of water. Hail is the other big one. Quarter-size hail is common. It bruises roofs, dents cars, and shreds patio screens.

Statewide, we rate severe storms a 3 out of 5. It's not the worst in the country, but it's not nothing. The Arizona Department of Emergency and Military Affairs (DEMA) is the state agency that coordinates response when storms get bad.

What actually happens to a house

Hail is the quiet destroyer. It knocks granules off asphalt shingles. You won't see it from the ground, but the shingle ages fast after that. Wind peels off ridge caps, tears screens, and blows down fences. Microbursts — sudden downdrafts — can top 60 mph and push in garage doors or lift a patio roof. Lightning starts house fires. In rural parts of Cochise, Navajo, or Apache counties, a strike can start a brush fire that threatens your home.

Flash flooding is the one that gets into the house. Water seeps into crawl spaces, garages, and ground-floor rooms. It doesn't need to be deep. An inch of water can ruin drywall, flooring, and electrical outlets. After the storm, you might see a ceiling stain weeks later. That's water that got under the shingles and into the attic. If you wait, you get mold and rot.

If you only do three things

If you only do three things: get a roof inspection before June, check your wind/hail deductible, and buy flood insurance if you're anywhere near a wash. Here's the short version.

1. Roof inspection. Before monsoon season. Look for missing shingles, cracked flashing, and loose tiles. A few hundred dollars for a pro inspection beats a five-figure replacement after a hailstorm.
2. Read your policy. Wind and hail are usually covered. But many Arizona policies have a separate wind/hail deductible — often 1% or 2% of your dwelling coverage. If your home is insured for $400,000, that's $4,000 to $8,000 out of pocket before insurance pays a dime. Check your declarations page.
3. Flood insurance. Flood is not covered by homeowners insurance. Not in Arizona. Not anywhere. You need an NFIP policy or a private flood policy. There's usually a 30-day waiting period. So if you're buying a house in a flood zone, don't wait until closing.

My opinionated take: do the flood policy first. It's the gap that can wipe you out. Wind damage is annoying. Flood damage is life-changing.

Questions we get

Does homeowners insurance in Arizona cover monsoon damage?

Usually yes for wind and hail, if you have a standard policy. But flood damage from a monsoon is excluded. If rain comes through a hole in your roof, that's often covered under the wind claim. If water rises from the street or a wash, that's flood — and you need a separate policy for it.

How do I find out if my Arizona house is in a flood zone?

Check FEMA's flood maps. Your county or city may also have local floodplain maps. Lenders require flood insurance if you're in a high-risk zone (A or AE). But a good share of flood claims come from areas not labeled high-risk. So even if you're not required to buy it, it's worth a look.

What's the difference between a severe thunderstorm watch and warning in Arizona?

A watch means conditions are right for severe storms in your area. Stay aware. A warning means one is happening or imminent. Take shelter now. In Arizona, warnings often pop up fast in the afternoon. Don't wait for the sky to turn black.

Where to verify this

We're not a government agency. We're editors. For official info, go straight to these sources.

• Arizona Department of Emergency and Military Affairs — state emergency coordination and preparedness.
• NOAA Storm Prediction Center — outlooks and watches for severe storms.
• NWS Thunderstorm Safety — what to do before, during, and after.
• Ready.gov – Thunderstorms — checklists for homeowners and families.

If you're buying a house in Arizona, ask for the flood zone determination and a CLUE report. That's the first step. Then call your insurance agent and ask two questions: what's my wind/hail deductible, and does this policy exclude flood? Write down the answers.