Excessive HeatExcessive heat occurs from a combination of high temperatures (significantly above normal) and high humidities. At certain levels, the human body cannot maintain proper internal temperatures and may experience heat stroke. The "Heat Index" is a measure of the effect of the combined elements on the body.Excessive Heat OutlookThis CPC product, a combination of temperature and humidity over a certain number of days, is designed to provide an indication of areas of the country where people and animals may need to take precautions against the heat during May to November.Excessive Heat WarningIssued within 12 hours of the onset of the following criteria: heat index of at least 105°F for more than 3 hours per day for 2 consecutive days, or heat index more than 115°F for any period of time.Excessive Heat WatchIssued by the National Weather Service when heat indices in excess of 105ºF (41ºC) during the day combined with nighttime low
temperatures of 80ºF (27ºC) or higher are forecast to occur for two consecutive days.Ground Heat FluxThe flux of heat from the ground to the earth's surface; a component of the surface energy budget.Heat AdvisoryIssued within 12 hours of the onset of the following conditions: heat index of at least 105°F but less than 115°F for less than 3 hours per day, or nighttime lows above 80°F for 2 consecutive days.Heat ExhaustionA mild form of heat stroke, characterized by faintness, dizziness, and heavy sweating.Heat IndexThe Heat Index (HI) or the "Apparent Temperature" is an accurate measure of how hot it really feels when the Relative Humidity (RH) is added to the actual air temperature.Heat LightningLightning that occurs at a distance such that thunder is no longer audible.Heat StrokeA condition resulting from excessive exposure to intense heat, characterized by high fever, collapse, and sometimes convulsions or coma.Heat WaveA period of abnormally and uncomfortably hot and unusually humid weather. Typically a heat wave lasts two or more days.Heating Degree Days(abbrev. HDD) A form of degree day used to estimate energy requirements for heating. Typically, heating degree days are calculated as how much colder the mean temperature at a location is than 65°F on a given day. For example, if a location experiences a mean temperature of 55°F on a certain day, there were 10 HDD (Heating Degree Days) that day because 65 - 55 = 10.Latent HeatHeat absorbed or released during a change of phase at constant temperature and pressure.Latent Heat FluxThe flux of heat from the earth's surface to the atmosphere that is associated with evaporation or condensation of water vapor at the surface; a component of the surface energy budget.
Sensible Heat FluxThe flux of heat from the earth's surface to the atmosphere that is not associated with phase changes of water; a component of the surface energy budget.Urban Heat IslandThe increased air temperatures in urban areas in contrast to cooler surrounding rural areas.
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