When you toss a stone or pebble into University Lakes it changes the relative calm waters into a ripple with a series of waves extending outward from the pebble drop. This same scenario often occurs in the atmosphere when a cold front, similar to the one moving through the area this morning, replicates the pebble by hitting a pocket of stationary air. Once this occurs with incredible force the ripple-reaction creates a series of gusty wind waves that ultimately hit the ground. These are called gravitational waves or gravity waves. They traditionally last about fifteen to twenty minutes and depending upon your location they strike the ground with incredible force. Gravity waves can eject wind gust in excess of 60 miles-per-hour with a punch of strong showers and thundershowers occurring thereafter. As of this writing we are not expecting straight-line winds, micro-bursts or gravity waves with this episode of thundershowers.