Basically, the breezes form as the land heats during the day, resulting in a relative lowering of surface pressure over the land compared to the adjacent water surfaces. Wind then blows from the water to the land at lower levels, and from the land to water aloft, creating a three dimensional circulation pattern. Outflow boundaries are created from thunderstorm downdrafts and also often look semi-circular. When two or more boundaries interact, even greater convergence occurs, and when two or more boundaries collide, convergence is maximized. Colliding boundaries often result in strong to severe thunderstorm formation.
Boundaries often collide over the central Florida peninsula, due to our unique geography.
If the large scale winds are generally light, sea breeze boundaries form along both the west coast and east coast and move inland during the day. Then, during the late afternoon or evening, the two boundaries collide, and result in rapid thunderstorm intensification. On a typical summer day, meteorologists watch and attempt to forecast the movement and interaction of hundreds of boundaries across central Florida. Even with plenty of boundaries present, thunderstorms will not form if moisture is lacking. Meteorologists continually assess moisture variables to determine whether thunderstorms will be isolated, scattered, numerous, or widespread in coverage on a given day.