Strong to severe thunderstorms associated with a threat for large hail, wind damage and a few tornadoes are expected to develop across the northern Plains, Upper Mississippi Valley and Mid Missouri Valley on Tuesday afternoon and evening.
Storms are forecast to develop across the Dakotas after 5pm Tuesday, and will line out. This line of storms will begin to enter northwest Iowa after 10pm Tuesday. At this time, it appears that the southern extent of this line will be weakening as it enters into northwest Iowa, which is why the Storm Prediction Center (SPC) has placed this area under a marginal risk. Storms that are severe will only pose a hail and damaging wind threat.
The severe threat will then shift to the east on Wednesday to northeast Iowa. Once again, this threat appears to be low due to storms and cloud cover remaining over the state Wednesday morning. These clouds and storms should prevent the atmosphere from becoming unstable, so this is why only a marginal risk of severe weather exists Wednesday afternoon.
Check back to IowaChase.com for the latest updates regarding this severe weather threat.