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Last Updated on Sunday, 10 January 2010 00:50 Written by Roger Hill

2002

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>My last day out would be one of my favorite on this trip. A boundary was present from overnight convection across northern South Dakota into North Dakota. I decided to play where the winds were backed and the approaching short wave would intersect the boundary. By 2 PM a supercell rapidly developed along this boundary near Buffalo, South Dakota. This storm became a monster supercell and produced copious amounts of baseball sized hail and a small tornado just northwest of Reva, South Dakota. Then the first cell died as it crossed the boundary into North Dakota, and a second very nice HP supercell developed back over Buffalo. Check out the pics below.

Explosive convection as supercell develops.	Updraft is dumping golf ball size hail.
Shelf cloud tries to form.	TORNADO!!! Northwest of Reva for 3 minutes.
What a striated, rotating beast!!!!	Tail cloud forms as storm tries to become tornadic again.
Vault area is full of baseball sized hail.	I encounter much golf ball sized hail.
Second supercell forms. Awesome vault!	Updraft is rotating.
Close up of the updraft	Storm lines out and produces beautiful shelf cloud.