Pancake Stack shelf just west Lake Oahe just as the sun fades into the Dakota skies. We measured and reported a high peak wind gust of 61MPH with the gust front on this storm as it overtook our location.
TCU trying to organize and GO! on the South Dakota/Nebraska line near Valentine.
Storms rapidly getting organized over the open county of Ziebach County South Dakota.
Finally
one of the cells attempts to do it as it interacts with a occluded
frontal boundary draped over Ziebach and Meade counties. This wall cloud
had visible rotation for a time shown here near Cherry Creek South
Dakota 5/18.
Darkening skies over the Badlands of South Dakota near Wall.
The Badlands greening up!
Well
developed wall cloud along along the Minnesota/Iowa border south of
Kiester MN. This wall cloud had fair rotation before the inflow became
quickly cut off east of Kiester.
Storms rapidly getting organized over the open county of Ziebach County South Dakota.
Nice Mammatus clouds greeted us on arrival, just North of Murdo in Jones County South Dakota.
Late evening severe warned storm rolling over the endless grasslands of central Stanley County in western South Dakota.
Shelf
cloud getting better organized as the storm approaches the Missouri
River and Lake Oahe northwest of the city of Pierre in Stanley County.
Shelf cloud getting better organized as the storm approaches the Missouri River and Lake Oahe northwest of the city of Pierre in Stanley County.