At about 6:00 PM CST (23:00 UTC) a sea-level cyclone and occluded front were located over North Dakota.
[1] Lifted Indices (LI) at the time CDT were also low, and thunderstorms were starting to develop in the Eastern Dakotas.
[1][2] Ten minutes later at 12:05 PM CST (0450 UTC) another tornado, rated an F0, was reported near Roseau, Minnesota.
[1] During the early morning hours of August 9 Duluth radar indicated multicellular convection near the Littlefork, Minnesota area that was associated with an outflow boundary from the earlier Dakota storms.
[1] At 1:35 AM CST (0735 UTC) a deadly F0 tornado touched down unexpectedly near Littlefork, in association with the multicellular thunderstorm.