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This Concept Map, created with IHMC CmapTools, has information related to: Mississippi Valley Effects, Mississippi River Valley (effects on regional weather) extends to Gulf Coast Region, Deep upper-level trough is typically followed by Cold arctic air masses, Weather that is more severe because of greater contrast between Maritime air masses, Gently rolling plains represent a Minimal friction layer, Polar air masses lead to Weather that is more severe, Polar air masses including Cold polar air masses, Minimal friction layer permits ingress of High and low pressure systems, Mississippi River Valley (effects on regional weather) extends from Great Plains, Cold arctic air masses most likely to cause Freezing temperatures, Deep upper-level trough forces the polar jet toward "Four Corners" region, Minimal friction layer permits ingress of Maritime air masses, Minimal friction layer permits ingress of Polar air masses, Weather that is more severe because of greater contrast between Polar air masses, Frontal systems involve Deep upper-level trough, Polar air masses more likely to ingress in Winter, Spring and Fall, Diffused and modified in mid-latitudes by Maritime air masses, Minimal friction layer permits ingress of Cold arctic air masses, Cold polar air masses more likely to ingress in Winter, Mississippi River Valley (effects on regional weather) is comprised of Gently rolling plains, Polar air masses are Diffused and modified in mid-latitudes