This past week, a slow-moving, upper-level system moving through the central U.S. triggered several days of severe weather. The system caused numerous tornadoes, as well as heavy rains and flooding from the Deep South up through the middle Mississippi River Valley and into the Ohio River valley. The situation began when an upper-level area of low pressure situated over the northeast Pacific pivoted down into the central Rockies, creating a deep trough of low pressure aloft that extended down into the northern Baja. This channeled strong jet stream winds from south of the Four Corners region up