The National Weather Service in Des Moines says scattered thunderstorms are possible today over far southern and western Iowa. The focus for thunderstorms will shift to northern Iowa overnight before ending on Friday. Saturday will be mostly sunny and warm ahead of a system that will impact the state Sunday and Monday. Strong to severe thunderstorms are expected to develop Sunday afternoon into Monday. Large hail, damaging winds and even a few tornadoes will be possible with this activity. Wednesday set the Iowa tornado free consecutive day streak with 356 straight days.