An Extreme Heat Warning is in effect right now for Atchison and Boone counties in Missouri, running from 1:03 PM CDT through 8:00 PM CDT on September 5, 2026. The warning was issued jointly by the National Weather Service Kansas City/Pleasant Hill MO and NWS St. Louis MO. If you are in either of those counties, this alert applies to you for the remainder of this afternoon and evening.
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What NWS Is Telling Residents to Do Right Now
The National Weather Service is direct in its guidance for the duration of this warning. Drink plenty of fluids, stay in an air-conditioned room, and stay out of the sun. Those three steps, taken together, form the core defense against heat-related illness during an Extreme Heat Warning. If you do not have air conditioning at home, this is the window of hours when locating a cooling center, library, or other air-conditioned public space matters most.
The official alert also calls on residents to check up on relatives and neighbors. Elderly residents, people with chronic health conditions, and those who live alone are at elevated risk during extreme heat events and may not reach out on their own. A brief phone call or a knock on the door between now and 8:00 PM CDT can make a measurable difference.
On vehicles: the National Weather Service is unambiguous. Do not leave young children or pets in unattended vehicles. Car interiors reach lethal temperatures in a matter of minutes, even with a window cracked, even on a day that feels manageable outside. If you are making stops this afternoon, children and pets come with you, every time, with no exceptions.
There is no gray area in the warning language. The word “extreme” in this alert classification exists precisely because the health risk is not theoretical. The guidance above is not precautionary boilerplate; it reflects the conditions NWS has determined are present in Atchison and Boone counties right now.
Connecting This to Broader Preparedness
Heat warnings like this one tend to catch people off guard because they do not carry the visible drama of a tornado or a flood. There is no wall of water, no rotating cloud. The danger accumulates quietly, which is exactly why a structured, household-level response matters. At USRiskRadar, our evergreen guidance on heat preparedness emphasizes building the habit of checking on your immediate network, whether that is a neighbor, an elderly parent, or a family member without reliable air conditioning, before conditions become critical. The window between a warning issuance and its expiration, in this case roughly seven hours, is the practical timeframe you have to act. Use the hours between now and 8:00 PM CDT on September 5 to confirm that everyone in your immediate circle is accounted for, cooled down, and hydrated. That is the response this warning is asking for, and it is the one that prevents emergency calls later in the evening.
For the fundamentals that apply beyond this specific alert, see our Extreme Heat Preparedness guide.
Source: National Weather Service (NWS Kansas City/Pleasant Hill MO, NWS St Louis MO). Active alert data retrieved 2026-09-05 22:01 UTC via api.weather.gov.
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