 Activity was not as great as expected on April 6 , with only 13 tornadoes confirmed , mostly in Kansas . Several of the tornadoes were damaging , but no fatalities and only a few injuries were reported . The reason for the relatively modest activity was due to the more stable than expected air mass that day over the region , with lower <unk> and less wind shear despite the absence of a cap which would have otherwise allowed a massive outbreak . , 
