The eggs just stay in a depression waiting for water. The eggs are very durable and will last several months without hatching. The problem worsens when construction is going on in an area, as this produces many suitable breeding sites. Mosquitoes are also a problem on farms where water pools from animal hooves, equipment, etc. Roadside ruts and depressions in the lawn and garden and depressions where the landscape is being graded can also be mosquito breeding grounds.
Hurricanes lead to the upheaval of trees and holes in trees.
Earth-gouging by heavy equipment to clean up hurricane debris leaves many ruts which are then excellent breeding sites. In cemeteries the flower vases collect water. Look for old tires or tire dumps - they are favorite breeding places. Habitat modification as mentioned above. Eliminate puddling around the house.