Damaging-wind severe storms and flash-flood risk target Upper Midwest
Damaging wind is the main threat tonight across parts of the Upper Midwest and Great Lakes, with isolated tornadoes and hail possible—and flash-flood risk where storms train.
What forecasters are watching
Forecasters are tracking a multi-round severe-storm pattern that starts tonight and carries into Thursday, with the strongest emphasis centered on the Upper Midwest into the Upper Great Lakes. The Storm Prediction Center’s Day 1 outlook puts an Enhanced Risk over portions of that corridor, with the follow-on threat expanding on Day 2 into additional parts of the Upper Great Lakes and Midwest—and with some potential signals reaching farther toward parts of the Northeast.
Main hazards: damaging wind first
The most widespread, higher-confidence hazard tonight is damaging wind. SPC also notes that a few tornadoes remain possible in the strongest storms, along with isolated large to very large hail.
On Thursday, SPC’s Day 2 outlook continues to focus on severe storms that could form in clusters or a more organized system, again keeping damaging wind and large hail as the leading concerns. The tornado risk is described as possible but narrower than the wind/hail threat, and how far the Northeast signal extends depends on storm track and timing.
Where flooding could develop: training storms
Separate from the severe-wind risk is a rainfall problem. The Weather Prediction Center maintains a Slight Risk of excessive rainfall for parts of the Upper Midwest on Day 2, tied to the potential for storms to train along a boundary—meaning repeated rounds could drop heavy rain over the same areas.
WPC’s discussion also flags that if the setup holds, another heavy-convection round could create multi-day impacts across parts of northern Iowa, southeast Minnesota and west-central Wisconsin. WPC emphasizes that the exact placement of the heaviest rain still carries uncertainty.
What to do before storms arrive
This is an outlook, not a warning—so conditions can change. If you live or work in the higher-risk corridor, set up multiple ways to get alerts (NOAA Weather Radio and wireless alerts), and check the difference between a watch (conditions favorable) and a warning (take action now).
For anyone driving through storm-prone areas, treat flooded roads as a real risk: NWS flood-safety guidance advises against driving through water of unknown depth, because fast-moving water can sweep vehicles away.
What to watch next
As the system evolves, focus on updated SPC/WPC outlooks and the appearance of any watches or warnings. The headline concerns remain damaging wind tonight, with isolated tornadoes and large hail in the stronger storms, plus localized flash flooding where storms repeatedly dump rain on the same areas.
Sources
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