Hot temperatures and choking humidity levels will make for a dangerous couple of days across a good portion of the United States this weekend as summer reminds us it’s far from over. Widespread highs in the upper 90s and heat indices up to 110°F are likely from the Plains to the coast.

Out of the comfort and into the fire went the central United States this week as the latest NotReallyAPolarVortex left in a hurry. Temperatures themselves are hot enough — topping 105°F in places — but as the old phrase goes, it's not the heat that gets you, it's the humidity. On days like today, the heat index is crucial.