Severe Storms
Gust Front Explained: The Wind Boundary Ahead of a Thunderstorm
What a gust front is, why wind can arrive before rain, and how gust fronts create dust, shelf clouds, and sudden travel hazards.
Quick answer: A gust front is the leading edge of rain-cooled air spreading out from a thunderstorm.
Outflow air
Thunderstorm downdrafts bring air down to the surface. That air spreads outward as outflow.
The leading edge can feel like a sudden cool gust or wind shift.
Cloud and dust signs
Gust fronts can create shelf clouds, blowing dust, and sharp temperature drops.
They can arrive before the main rain and lightning.
Hazards
Gust fronts can knock down branches, flip loose objects, and create crosswinds.
Secure outdoor items before storms arrive.