Monsoons

Monsoons are seasonal weather patterns that bring prolonged heavy rains, flooding, and severe thunderstorms. While most strongly associated with South Asia, parts of the United States—particularly the Southwest (Arizona, New Mexico, Nevada, Colorado, and Utah)—experience a North American Monsoon from mid-summer through early fall.

Monsoons can replenish reservoirs and aquifers, but they also carry risks: flash flooding, landslides, lightning, power outages, and dangerous driving conditions. In desert regions, intense rainfall can overwhelm dry riverbeds (arroyos), turning them into sudden torrents. Monsoons may also worsen dust storms (haboobs) as storm outflows collide with dry ground.

Preparedness Actions

Before a Monsoon Season

  • Enroll in local emergency alert systems and monitor National Weather Service (NWS) seasonal outlooks.

  • Prepare for flash flooding by keeping sandbags and barriers available, especially if living in flood-prone zones.

  • Inspect roofs, gutters, and storm drains to ensure proper drainage.

  • Avoid building or camping in low-lying washes or near steep slopes.

  • Maintain a 3–7 day emergency kit with food, water, flashlights, and first aid.

  • Develop an evacuation plan for family and pets in case of severe flooding or lightning-caused fires.

During a Monsoon Storm

  • Stay indoors and away from windows when lightning is present.

  • If driving: “Turn Around, Don’t Drown”—never drive into flooded roads or washes. Just 6 inches of water can stall a car; 12–18 inches can sweep vehicles away.

  • Disconnect electronics to protect against lightning surges.

  • Avoid using corded electronics or plumbing fixtures during lightning storms.

  • Stay alert for possible dust storms (haboobs) generated by thunderstorm outflows.

After a Monsoon Storm

  • Avoid floodwaters, which may be contaminated with chemicals, sewage, or debris.

  • Report downed power lines or blocked roads to local authorities.

  • Clean and dry any flooded areas promptly to prevent mold growth.

  • Check for structural damage to roofs, fences, and outdoor equipment.

Recovery Guidance

  • File insurance claims promptly for water damage, roof leaks, or flood losses.

  • Seek medical care for respiratory issues caused by mold exposure.

  • Participate in community cleanup efforts but wear protective clothing and masks.

  • Document damage with photos and receipts for FEMA or local aid programs.

Key Resources

National Weather Service – Monsoon Safety
Official preparedness and safety information for the U.S. monsoon season.
weather.gov/safety/monsoon

Arizona Department of Emergency and Military Affairs (DEMA)
Provides state-specific monsoon readiness tips, including flash flood preparation and public alert systems.
azdema.gov

FEMA – Flood Safety and Preparedness
Federal-level resource for flood response and recovery during monsoons.
fema.gov/floods

Recommended Apps

FEMA App – Offers wireless emergency alerts, disaster checklists, and shelter locations.
fema.gov/mobile-app

MyRadar – Real-time radar with thunderstorm, lightning, and flash flood overlays.
myradar.com

AccuWeather – Provides hyper-local forecasts and monsoon-specific alerts.
accuweather.com

IQAir AirVisual – Tracks air quality, useful during dust storms triggered by monsoon outflows.
iqair.com/world-air-quality