Central Iowa is currently facing severe weather conditions, with a severe thunderstorm warning and flash flood alerts in effect across multiple counties. The National Weather Service (NWS) issued a severe thunderstorm warning at 5:50 p.m. on September 8, 2026, affecting Boone, Jasper, Marshall, Polk, and Story counties.
Why it matters: Severe thunderstorms pose a threat to safety and infrastructure, with warnings indicating potential for damaging winds and heavy rainfall.
The NWS warned of winds up to 70 mph and hail as large as 0.75 inches.
Residents are advised to seek shelter in an interior room on the lowest floor of their homes.
Flash flooding is occurring in urban areas and low-lying regions, complicating travel and safety.
Driving the news: The severe thunderstorm warning was prompted by radar indications of dangerous weather patterns moving through the area.
A severe thunderstorm was located over Alleman, approximately 7 miles north of Ankeny, moving east at 40 mph.
Locations impacted include Des Moines, Ames, West Des Moines, and surrounding cities.
The storm is expected to bring additional rainfall amounts of 1 to 2 inches, exacerbating flooding risks.
State of play: As the storms progress, flash flood warnings have been issued, highlighting the immediate danger to residents.
The flash flood warning for Polk and eastern Dallas counties is in effect until 12:30 a.m. on September 9.
Reports indicate that between 1 and 2 inches of rain have already fallen, with more expected.
Flash flooding has impacted highways and streets, making travel hazardous in affected areas.
The big picture: The severe weather system has led to widespread power outages and damage across central Iowa.
About 13,000 MidAmerican Energy customers lost power shortly after 8 p.m. due to downed trees and power lines.
Damage to roofs, siding, trees, and mobile homes is anticipated as storms continue to move through the region.
Local authorities are urging residents to stay indoors and avoid unnecessary travel until the storm passes.
What they're saying: Meteorologists and local officials are emphasizing safety during this severe weather event.
The NWS stated, "For your protection, move to an interior room on the lowest floor of a building." This advice is aimed at minimizing risk during the storm.
Local emergency services are monitoring the situation closely, ready to respond to any emergencies related to the severe weather.
Residents are reminded, "When thunder roars, go indoors," highlighting the dangers of lightning associated with thunderstorms.
By the numbers: The severity of the storm can be quantified by key weather indicators.
Wind gusts are reported at up to 70 mph, posing risks of structural damage.
Hail sizes of up to 0.75 inches can cause damage to vehicles and property.
Flash flooding has already impacted urban areas, with water covering local streets.
Between the lines: The current storm system is part of a larger pattern affecting the Midwest.
Heavy rainfall and severe storms are expected to persist through the night, impacting travel and safety.
Residents in flood-prone areas are advised to prepare for potential evacuations if conditions worsen.
Authorities will continue to monitor the situation and provide updates as necessary.
What's next: Weather forecasts indicate continued storm activity through the week.
Storm chances are expected to return Friday night through Monday night, with the potential for additional heavy rainfall.
Residents should remain vigilant and stay informed about weather updates and alerts from the NWS.
As conditions improve, drier air is forecasted to move in, providing some relief from humidity by Thursday.
As the severe weather continues to impact central Iowa, residents are urged to stay safe, heed warnings, and prepare for possible flash flooding. Local authorities are working diligently to address power outages and assess damage as the storm progresses.