MASON CITY, Iowa (KIMT) -- Many KIMT News 3 viewers sent in fantastic photos of the mammatus clouds Monday evening. These were formed by sinking air at the base of strong to severe storms that rolled through North Iowa.

Jasmine Leef captured this great image in Mason City:

Steve Meyer in Mason City:

Hunter in Osage:

Tina Dyre in Mason City:

JR Davis in Mason City:

Anonymous viewer in Mason City:

Melissa Schuchard in Clear Lake:

Brad in Clear Lake:

If you have any photos of Monday's mammatus clouds, send them in to weather@kimt.com .

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