There still remains high uncertainty for the midweek storm system. As of now, the greatest impacts are progged for Tuesday evening through Thursday morning for the southern Colorado plains. An upper-level trough is on track to move in from the west and combine with the remnants of Hurricane Polo from the Pacific. This will bring prolonged rainfall chances to Colorado through Thursday. Modeling is split between two scenarios- a southern track and a northern track of the upper level low. A southern track would keep the heaviest rainfall confined to far southern portions of our area and into SE Colorado. A northern track would bring the axis of heavier rainfall over a larger portion of our area. There is slowly increasing confidence for heavy rainfall and isolated instances of flooding across our southeastern forecast area. Note that any subtle shifts in the upper level low track will lead to large differences in rainfall totals. Regardless of which scenario plays out, we expect a sharp cutoff in rainfall somewhere across our area or just to the south.