DES MOINES — A relentless line of training storms has parked itself over a stretch of the Midwest running from Omaha through Des Moines and into Dubuque, dropping over three inches of rain in some spots overnight and threatening another 0.5 to 1-plus inches before the system finally clears Tuesday afternoon.
Radar Shows a Corridor That Won’t Quit
As of 1:10 a.m. CDT Tuesday, radar depicted an almost unbroken band of heavy-to-intense rainfall stretching diagonally across the region, with the most intense cores — shown in deep orange and red on radar — clustered directly over Omaha, Des Moines and Cedar Rapids, and a second concentrated pocket sitting over Dubuque and just north of Davenport. Between those two hot spots, a nearly continuous swath of moderate-to-heavy rain connected the corridor from the Nebraska-Iowa border all the way to the Iowa-Illinois line.
What made the setup especially dangerous wasn’t just the intensity of individual cells — it was that new storms kept forming and moving over the exact same stretch of ground repeatedly, a pattern known as training, where one storm after another rides the same track like train cars on rails. That repetition is why rainfall totals climbed so fast overnight even though no single storm was anything unusual on its own.
Three Inches Down, More Still Expected
By the overnight hours, some areas had already recorded more than three inches of rain, a significant total for a single overnight period and enough on its own to raise flooding concerns across low-lying and flood-prone terrain. Forecasters warned the threat wasn’t over, with an additional 0.5 to 1-plus inches possible in the hardest-hit corridor before the system finally pushes out and rain tapers off Tuesday afternoon…