such as air temperature, humidity, solar exposure, and wind speed. (3) Heat event The term heat event means an occurrence of extreme heat that may have heat-health implications. (4) Heat-health The term heat-health means mental and physical health effects to humans from heat or the risk of such effects. (5) Planning The term planning means activities performed across time scales (including days, weeks, months, years, and decades) with scenario-based, probabilistic or deterministic information to identify and take actions to proactively mitigate heat-health risks from increased frequency, duration, and intensity of heat waves and increased ambient temperature. (6) Preparedness The term preparedness means activities performed across time scales (including days, weeks, months, years, and decades) with probabilistic or deterministic information to manage risk in advance of a heat event and increased ambient temperature. (7) Tribal government The term Tribal government means the recognized governing body of any Indian or Alaska Native tribe, band, nation, pueblo, village, community, component band, or component reservation, individually identified (including parenthetically) in the list published most recently as of the date of enactment of this Act pursuant to section 104 of the Federally Recognized Indian Tribe List Act of 1994 ( 25 U.S.C. 5131 ). (8) Vulnerable populations The term vulnerable populations means populations that face health, financial, educational, or housing disparities that would render them more susceptible to the negative impacts of extreme heat. 612. Study on extreme heat information and response (a) Study (1) In general Not later than 120 days after the date of the enactment of this Act, the Under Secretary of Commerce for Oceans and Atmosphere, in consultation with representatives from the Department of Health and Human Services as the Secretary of Health and Human Services considers appropriate, shall seek to enter into an agreement with the National Academies of Sciences, Engineering, and