SIOUX CITY, Iowa – First Alert Weather Days are in effect for Thursday and Friday across Siouxland, with strong to severe storms and the potential for flash flooding expected to impact much of the region.
Thursday: Storms possible by evening, flooding concerns grow
We kicked off the day with a quick-moving line of thunderstorms that passed through the region early this morning. Conditions have since quieted down, but we’re keeping an eye on the potential for new storm development later this afternoon, especially across western Siouxland.
Temperatures will once again climb into the upper 80s to low 90s, with southeast winds ranging between 15 and 25 miles per hour. While most of the afternoon looks quiet, the weather is expected to turn much more active as we head into the evening hours.
The Storm Prediction Center has placed much of Siouxland under an Enhanced Risk (Level 3 out of 5) for severe weather from 5 p.m. to midnight. Forecasters are warning of the potential for wind gusts up to 70 mph, golf ball-sized hail, and even an isolated tornado. Alongside these severe threats, heavy downpours are expected, with some areas potentially picking up 2 to 3 inches of rain in just a few hours.
A Flood Watch remains in effect for parts of the region through 7 a.m. Friday, with street and urban flooding a growing concern.
Thursday night: Storms linger, gusty winds likely
As we move into the evening and overnight hours, the risk of strong to severe thunderstorms remains. The most active period is expected during the early nighttime, though scattered storms may persist into the overnight.
Low temperatures will fall into the mid to upper 60s, with southwest winds continuing at 15 to 25 mph. Gusts could become stronger in and around any storm cells.
Friday: Brief lull before more severe storms possible
Friday may start off calm, but don’t let your guard down. Highs will be in the 80s, and while the first half of the day looks relatively quiet, conditions are expected to shift again by the afternoon and evening.
As of Thursday morning, the Storm Prediction Center has issued a Marginal Risk for severe weather across the region, with threats including gusty winds, large hail, and heavy rainfall. On top of that, most of Siouxland is under a Slight Risk for Excessive Rainfall, which could mean renewed flooding issues, especially in low-lying or poorly drained areas.
Looking ahead: A calmer weekend, summer heat returns
After a stormy end to the week, Saturday is shaping up to be a standout. Forecasts call for lower humidity and highs in the low to mid-80s, offering a refreshing break from the active weather pattern.
But the relief will be short-lived. Both heat and humidity are expected to return on Sunday, with another weather system potentially developing by the middle of next week.
Stay with KTIV and the First Alert Weather Team for the latest updates as this active pattern continues to unfold.
