![]() ![]() HeatRisk provides a quick view of potentially impactful heat conditions over the upcoming seven days based on how much above normal high and low temperatures are, the duration of unusual heat, and humidity (as represented by overnight low temperatures). Level 4 (Magenta): Extreme Risk for entire population due to long duration heat, with little to no relief overnight. Level 3 (Red): Major Risk for much of the population, especially those who are heat sensitive and those without effective cooling and/or adequate hydration. Level 2 (Orange): Moderate Risk for those who are sensitive to heat, especially those without effective cooling and/or adequate hydration. Level 1 (Yellow): Minor Risk for those extremely sensitive to heat, especially those without effective cooling and/or adequate hydration. In order to better address heat risk and allow you to prepare for upcoming heat events, the NWS developed the experimental HeatRisk product. Hence, there is not one single, constant temperature used to determine when an alert will be issued. For example, a temperature of 105 ☏ in May will seem hot, whereas the same temperature in June or July will not seem as hot because our bodies have acclimated to the heat. Research also shows that our bodies have a greater ability to tolerate heat as the summer wears on, known as acclimation. Note the general connection between high/very high HeatRisk levels and alerts.Ĭollaborative research with the Centers for Disease Control and Prevention (CDC) shows that heat-associated deaths in Arizona can occur with temperatures in the mid 80s and hotter. Displayed alerts include Excessive Heat Watches (maroon), Excessive Heat Warnings (magenta), and Heat Advisories (orange). ![]() When the NWS issues an alert, it should serve as a signal that on that day it is not "business as usual."Ĭomparative example of HeatRisk (left) and NWS heat alerts (right) during a significant heat event in June 2017. ![]() These alerts are intended to raise awareness and prevent heat illness and death from occurring and mitigate financial impacts. During Arizona's hottest months, the NWS issues alerts to notify the public when unusually hot weather is expected. Heat is the deadliest weather in Arizona. Weather-related deaths in Arizona by weather type, 2010-2020. ![]()
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