August 22-28, 2001:

The August 22-28 period was quite wet in some of the previously dry regions of the Midwest. Central Illinois, southern Wisconsin, and much of Lower Michigan received several inches of rain (Figure 13) and were well above normal for the week (Figure 14). At the same time, temperature conditions were somewhat above normal, by several degrees in most areas to more than 5°F in areas that missed the rain (Figure 15). Early in the week, a warm front brought heavy rain to the southeastern Great Lakes area, and then faded south to form a stationary front across from Missouri to Ohio. Very heavy rain fell from the 22nd to the 24th at various locations along and north of the boundary, with the area where Iowa, Illinois, and Missouri meet receiving up to 8-10 inches of rain (Figure 16, NWS). The storms along this stationary boundary caused considerable crop damage, not only in places receiving excessive rain, but in locations impacted by severe weather. In addition, widespread fog developed north of the boundary for several days. The warm front returned north on the 25th and 26th, bringing more rain to the central and northeastern Midwest. Finally, at the end of the period, a cold front swept down from the northwest, cooling conditions somewhat and drying out the region.