Severe storm potential is building across parts of western and northwestern Iowa today. A cluster of showers and storms is lifting through eastern Nebraska and will cross into northwestern Iowa this afternoon. The atmosphere out ahead of this area of rain will destabilize today allow for more storms to form along and south of this area of disturbed weather. Strong heating is expected in parts of western and central Iowa to help fuel the storms. The dewpoints are rising to the 60s and 70s with more muggy conditions in place.
The storms look to be very isolated and in the western stretches of the state. There could be some large hail and damaging winds with the storms, as well as an isolated tornado threat.
Storms are not expected in the Des Moines Metro area until after 9 PM and through midnight. As the storms move through, they will be more linear in nature with more of a damaging wind risk.
The storms will produce heavy rain in a short amount of time. 1 to 2” of rain is expected with some locally higher amounts. Flash flooding may occur quickly with some of the storms.
The rain should be through and in far southeast Iowa by the morning drive time to work and school on Wednesday. However, more storms may redevelop along the cold front in southern Iowa by the end of the day on Wednesday. Cooler air returns with the 70s on Thursday and Friday.