Regional Weather
Monsoon Weather Safety Guide: Flash Floods, Dust, Lightning, and Sudden Wind
A guide to monsoon-season hazards, including flash flooding, dust storms, dry lightning, sudden gusts, and rapidly changing desert weather.
Quick answer: Monsoon weather can bring bursts of heavy rain, lightning, dust, and strong wind to places that may be dry only minutes earlier.
Flash flooding
Desert washes, slot canyons, underpasses, and low roads can flood even when rain falls miles away.
Water can move quickly through channels that were dry before the storm.
Dust and wind
Thunderstorm outflow can lift dust walls and produce sudden crosswinds.
Visibility can collapse on highways before rain arrives.
Planning
Check radar, alerts, and local flood warnings before hiking, driving, or camping in monsoon regions.
Have a higher-ground plan and avoid entering flooded washes.