Sept. 18 Severe Weather

Although no watches were issued tonight there have been several damaging wind reports within two lines of thunderstorms that developed in the state. The first line developed in areas of eastern Iowa and moved to the northeast, leaving a trail of reports from Poweshiek county through the northeast corner of the state. Reports range from the minimum severe level of 60 mph up to a 79 mph wind reports; those storms currently have moved out of the state.

A second line of storms developed along the cold front in western Iowa and eastern Nebraska this afternoon and have since gained strength and organization. A portion of this line has been able to maintain severe levels from it entering the state in Harrison county and current severe warnings for Story & Polk counties. These storms do however show signs of weakening as instability is on the decrease and it is entering an area where storms have already been through. Expect mainly heavy rains and some frequent lightning, along with gusty winds up to 40-50 mph with the strongest portion of the storms. They should hold together to make it through a majority of the state overnight, expect clearing by sunrise as far as showers go. Some cloud cover may be maintained in eastern Iowa, but cleared by Noon.