Tracking the Weather
Air masses collide
Lightning heats air quickly
Warm air hits the ground
A warm front forms
When a cold air mass pushes under a warm air mass
When a warm air mass pushes under a cold air mass
When two cold air masses collide
When the boundary between two air masses stops moving
Over dry land
Over cold ocean waters
Over warm lakes and streams
Over warm ocean waters
Front
Hurricane
Thunderstorm
Tornado
Cold
Thunderstorm
Tornado
Warm
Front
Hurricane
Air mass
Tornado
Cold front
Hurricane
Tornado
Warm front
Front
Hurricane
Thunderstorm
Tornado
Air mass
Hurricane
Thunderstorm
Tornado
Air masses
Hurricanes
Thunderstorms
Tornadoes