Heat, severe storms and heavy rain expected across Iowa this week

DES MOINES, Iowa — Iowans are facing a stretch of active weather this week, with dangerous heat Tuesday followed by multiple chances for severe thunderstorms and heavy rainfall through Thursday, according to the National Weather Service in Des Moines.

A Heat Advisory is in effect Tuesday from 1 to 9 p.m. for much of Iowa. Forecasters say afternoon temperatures will climb into the low to mid-90s, with heat index values reaching 100 to 105 degrees in some areas.

The National Weather Service is urging people to drink plenty of water, take breaks in air conditioning or shade, and never leave children or pets unattended in vehicles.

Thunderstorm chances increase Tuesday night into early Wednesday, especially across western and northwest Iowa. The National Weather Service says there is a conditional risk for severe storms, with the highest chances in northwest and western Iowa. Storms may struggle to develop at first due to warm air aloft, but storms in the region are more likely overnight.

The primary threats Tuesday night include damaging winds and large hail. The greatest window for storms is expected between 10 p.m. Tuesday and 4 a.m. Wednesday.

Additional severe weather is possible Wednesday afternoon and evening. An Enhanced Risk for severe storms is in place for parts of Iowa, with the highest local risk mainly in northeast Iowa. Forecasters say numerous severe storms are possible after 3 p.m. Wednesday, with hazards including damaging winds, large hail, heavy rain and the possibility of tornadoes.

Another round of severe storms is possible Thursday afternoon and evening. The National Weather Service says southeast Iowa currently has the highest risk Thursday, with all severe weather hazards possible.

Heavy rainfall and flash flooding will also be concerns during the middle and latter part of the week. Showers and storms are likely Wednesday night, with locally heavy rainfall amounts over 2 inches possible. Rain and storms may continue much of Thursday, with thunderstorm activity increasing during the afternoon.

The flash flooding threat is highest in southern Iowa, where soils are more saturated. Forecasters warn that urban ponding, rising streams and flash flooding are all possible.

Residents are encouraged to have multiple ways to receive weather warnings, know where to take shelter indoors, and stay weather aware if they have outdoor plans. Drivers should never attempt to cross flooded roads.