The top pic. (from Todd and Brad Reed) shows a meteotsunami at Lake Michigan on April 13, 1918. A line of thunderstorms with strong winds pushed the water of the lake toward the Michigan shore, causing the water level to rise several feet, rising to cover the breakwater. The rising water level can cause rivers that empty into the lake to flow backwards.
We usually associate tsunamis with earthquakes, but a line of strong storms can produce the same effect (usually on a smaller scale). On Thursday, a line of strong to severe storms moved across the Florida Peninsula. It produced 4 tornadoes and general wind gusts of 40-60 mph along with 2-4″ rains. The storm pushed the water toward shore and produced this meteotsunami at Captiva/Sanibel Island near Fort Myers. You can see the water came in quickly and didn’t retreat like a normal wave would do.