I remember the first time I heard the word “derecho” . It was the great lakes derecho of 1995. It was so bad it has its own page on wikipedia. It caused a seiche wave on Lake Huron. Imagine you have a bowl full of water. And somehow that bowl gets jostled. The water sloshes back and forth. Now imagine that bowl is the size of lake Huron. That’s a seiche wave. there was a vacant lot next to my parents lake house. A 20 foot boat ended up adjacent to their front yard. they ended hauling it out with a crane From the road. I was there that day. Scariest thing I ever saw.
CC
OK, it’s NOAA, but this is really impressive graphics and time lapse radar at this link: http://www.spc.noaa.gov/misc/AbtDerechos/casepages/jun292012page.htm
THAT'S the one I was thinking of. I couldn't recall the year exactly, but do remember about how old the kids were.