Extratropical Cyclones Forming East of the Rocky Mountains

Online 10.4: Cutoff Lows Midwest Radar During a Cutoff Low: A cutoff low developed over the Iowa/Wisconsin/Illinois border in late May 2001. Radar imagery of the Midwest shows the diurnal nature of thunderstorms that develop in association with the cutoff low. During afternoon hours, short lived lines of weak thundershowers surround the low. Several of these weak thundershowers produced weak cold air funnels.