The gap between the quality of Channel Sux and that of KETVNewswatch7 is never more apparent than in the midst of a tornado warning like the one issued for Omaha on Monday afternoon.On Channel 7, chief guesser Bill Randby switched calmly between the station's clearly superior radar and its several live cams. Particularly helpful were shots from the 88th and I-80 unit, one at 90th and Dodge, and,