Today and tonight: Hot and humid conditions are expected to persist today, mainly across the southern half of the state with highest heat index values of 100 to 105.

Thunderstorms are also expected today into tonight, moving generally from north to south across the state. There is a marginal risk of severe thunderstorms across much of central Iowa with the main concern from strong to damaging thunderstorm winds. Locally heavy rainfall is also possible.

Monday through Saturday: Some isolated thunderstorms are expected late in the work week across Iowa. The severe threat appears low at this time.