Scattered showers and thunderstorms across northwest Iowa this afternoon, will bring the increased potential for flash flooding later this evening. After scattered thunderstorm development overnight which brought some spotty areas of southwest Minnesota from one to six inches of rainfall, additional and more widespread thunderstorms are expected to develop this afternoon and evening, tracking over a similar location tonight. Rainfall will average an additional 1 to 3 inches, with some locations getting locally heavier amounts as storms track over the same areas.
Rainfall rate of 1 to 2 inches per hour will be possible with stronger storms, and would be capable of producing flash flooding in urban areas, as well as small stream and other poor drainage locations. This flash flood watch will be in effect through Monday morning.
A flash flood watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. If you encounter a flooded road, turn around.