Rare Pictures of a Bow Echo 7-10-08 in Mokena, Il

[GINGERALER]

Tom Skilling said this was a Derecho cloud.

[StormChaseChicago]

Yes this is a shelf cloud. A shelf cloud is formed from the outflow winds of a strong thunderstorm. They do occur frequently in derecho situations, since derechos are usually fast moving, and contain reasonably strong outflow winds. I would have to see a radar image of this event to prove it was a derecho, since a derecho is a large line of thunderstorms that have bowed out in the middle. These are also sometimes called bow echos.

[lectricshock76]

Mymieke is right thts a shelf cloud, Choirfreak, NEVER let him live tht down. Anytime u can get pics of weather, GET IT!!!.

[Contreras12349]

I remember when tath happened

[Mymieke]

or a bow echo

[Mymieke]

that's a shelf cloud on the leading edge of a mesocyclone not a derecho

[choirfreak26]

We were at a baseball game in Crestwood and we saw that thing coming our way. I asked my dad if I could take a picture with his phone and he told me "No way!" He's still not hearing the end of that one ;)