DES MOINES, Iowa (AP) – It’s the first day of fall, but residents in Iowa and Nebraska shouldn’t break out those sweaters and boots just yet. The National Weather Service has issued a heat advisory for most of Iowa, covering most of the eastern two-thirds of the state. The advisory is in effect until 7 p.m. today (Friday). Forecasters say high temperatures climbing into the 90s mixed with high humidity will push the heat index to around 100 degrees in some places.

The weather service has also issued a hazardous weather outlook for Nebraska and western Iowa, where the heat index is expected to climb to the upper 90s. The service says a cold front is expected to move into the region early next week and will bring more seasonal temperatures.