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At the end of April, over 100 tornadoes swept through the US in just one week, cropping up in unexpected areas. But why?

United statesPacific oceanJana houserNational centers for environmental informationEnvironmental research lettershasOhio state universityStorm prediction centerDepartment of geographyNational weather serviceAmerican meteorological societyNational severe storms laboratoryNational centersEnvironmental informationStorm predictionSevere storms laboratoryTornado alley