September 29, 2016 – For the USDM 7-day period ending on September 27, a low pressure system produced above-normal precipitation in the western High Plains southwestward into the much of the Mountain West. The frontal boundary that was associated with the low produced copious amounts of rainfall for the Southern Plains stretching northward into Upper Midwest. Parts of the Mid-Atlantic also saw above-normal precipitation for the period. Drier-than-normal conditions existed for much of the country east of the Mississippi, especially for the Ohio Valley.