It’s the heat AND the humidity. Heat warnings are in place as above normal temperatures and very high dew points combine to produce a very dangerous situation across Iowa. Conditions are not very favorable this week for outdoor activities.
This heat wave likely won’t break until the end of the week, meaning anyone working or venturing outside this week should prepare to take plenty of fluids, sunscreen and take every reasonable precaution to keep cool. It’s been a while since Iowa has seen such a long duration heat wave such as this.
The cause of all this heat is an especially strong bubble of high pressure producing a dome over the state. This dome not only locks in the heat and humidity but also prevents any organized thunderstorms from developing. This pattern is not expected to break down for a while so it’s too soon to say what may happen once it does. In the meantime I can’t stress enough how important it is for people to take this situation seriously if you plan on spending an extended amount of time outdoors in the coming days.