Excessive rainfall and isolated flash flooding is possible on Friday across the Desert Southwest.

The potential for excessive rainfall will shift eastward into the Desert Southwest as an upper level trough slowly moves eastward. In addition, a cold front will be pushing southwestward across the Four Corners region and the interaction between the upper level trough and surface front will provide the focus for heavy rainfall. A north to south line of showers and heavy thunderstorms is expected to develop across eastern Arizona where rainfall totals of 0.50-1 inch can be expected with locally higher amounts in excess of 2 inches possible.

Elsewhere, a surface low pressure will track through the northeastern states and bring widespread showers and thunderstorms along a front. Widespread rainfall in excess of a quarter inch is possible.