A linear complicated of strong-to-severe thunderstorms is about to roll throughout Iowa tonight, with the Storm Prediction Middle putting a lot of the state underneath an Enhanced (Degree 3 of 5) threat for damaging winds, giant hail, and tornadoes. The risk begins late this afternoon, Friday Could 15, 2026, and continues by the in a single day hours. The Climate Prediction Middle is individually flagging a 50 p.c probability of rainfall exceeding 2 inches throughout a lot of Iowa.
Peak Driving Hazard Window
Late night into the predawn hours, roughly 9 PM to three AM CDT, appears to be like just like the worst window for I-80 east-west visitors, with the linear complicated aligning alongside a virtually stationary entrance and the rear-inflow jet driving the very best damaging-wind potential.
What to Count on
- Energetic window: Late this afternoon by early Saturday morning throughout Iowa
- Categorical threat: SPC Enhanced (Degree 3 of 5) throughout a lot of Iowa, with Slight threat extending south to the Oklahoma and Texas Panhandles
- Headline threats: Damaging straight-line winds, giant hail, and a twister risk alongside the nice and cozy aspect of the entrance
- Rainfall: 50 p.c probability of greater than 2 inches throughout a lot of Iowa, with remoted flash flood threat in northern Iowa per HRRR neighborhood chances
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The setup is a virtually stationary entrance draped throughout the midsection of the nation, with the nice and cozy sector forward of it loaded with Gulf moisture. As the road organizes after sundown, anticipate a fast-moving QLCS (quasi-linear convective system) sweeping west to east throughout I-80.
Highway Situations
I-80 traverses the complete state, so the publicity listing is large. Council Bluffs, Des Moines, Iowa Metropolis, and Davenport will all see the road cross in a single day, with I-35 by the Des Moines metro and I-380 between Cedar Rapids and Iowa Metropolis additionally within the path. Hydroplaning is the first threat in the course of the heaviest bands, and remoted city flash flooding is feasible in northern Iowa. Examine 511ia.org for stay circumstances.
Extreme Storm Driving Ideas
A QLCS with embedded supercells is a tire-and-visibility downside. Verify tread depth at or above 4/32 inch and inflate to door-jamb spec; underinflated tires hydroplane at decrease speeds. Sluggish nicely beneath the posted restrict in the course of the heaviest cells, double your following distance, and activate headlights any time wipers are working (Iowa legislation). If a twister warning fires when you are driving, depart the car for a sturdy construction or low floor, not an overpass. For extra, see Autoblog’s hail injury and extreme storm car prep and hydroplaning prevention guides, plus the NWS extreme climate security web page.
Timing
The Iowa Enhanced threat runs by tonight into Saturday morning. SPC has the subsequent spherical flagged for Saturday night time into Sunday morning throughout the northern Plains, and WPC’s medium-range outlook requires “a number of rounds of heavy rain and extreme storms” throughout the Plains by subsequent week, anchored by the identical stationary entrance sample. NWS Des Moines and NWS Quad Cities each have extreme climate banners up by early subsequent week. We’ll replace this text as circumstances evolve.
