Heavy rainfall and severe weather have impacted parts of Texas and Louisiana as Tropical Depression Imelda moves onshore. As the remnant low pressure system becomes caught in the flow of the jet stream, it will pull quite a bit of Gulf moisture northward into the lower Great Lakes.
Isolated showers and thunderstorms will be possible both Thursday and Friday, but heavy rainfall will be possible Saturday and Sunday across Iowa, Illinois and Indiana. It’s yet to be seen where exactly the heavy rain will set up, but where it does rainfall totals could add up to another couple inches. This next system comes after over 7 inches of rain have fallen over northern Illinois and southern Wisconsin just within the past week and a half. The long range outlook through the end of the month features temperatures remaining above average, but also the possibility for above average precipitation.
So far, the month of September is the 4th wettest September on record (this is through the 18th). The wettest September on record was September 1961 when 10.68 inches fell.