Extreme Heat
A period of abnormally hot and dangerous temperatures, with or without high humidities, that can result in negative impacts to people, animals, and infrastructure.
Extreme Heat Warning
This product is issued by the National Weather Service when extremely dangerous heat is expected or occurring. The criteria for this warning varies from place to place.
Extreme Heat Watch
This product is issued when conditions are favorable for an extreme heat event but its occurrence, location, and/or timing is still uncertain.
Ground Heat Flux
The flux of heat from the ground to the earth's surface; a component of the surface energy budget.
Heat Advisory
This product is issued for dangerous heat conditions that are not expected to reach warning criteria.
Heat Cramps
Painful, involuntary muscle spasms that can occur due to the overheating of the body during prolonged exertion and excessive sweating. Heat cramps may be the first sign of heat-related illness and can lead to heat exhaustion or stroke.
Heat Exhaustion
A heat-related illness characterized by the body's inability to effectively cool itself, typically occurring in high ambient temperatures or during intense physical exertion. It is characterized by headache, nausea, dizziness, weakness, irritability, thirst, and/or heavy sweating.
Heat Index
The 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 Lightning
Lightning that occurs at a distance such that thunder is no longer audible.
Heat Stroke
A serious heat-related illness where the body can no longer control its temperature: the body's temperature rises rapidly, the sweating mechanism fails, and the body is unable to cool down. When heat stroke occurs, the body temperature can rise to 106°F or higher within 10 to 15 minutes. Heat stroke can cause permanent disability or death if the person does not receive emergency treatment.
Heat Wave
A 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.
HeatRisk
A color-numeric-based index that uses weather, climate, and Centers for Disease Control and Prevention (CDC) heat-health data to place the upcoming temperature forecast into climatological context and identify potentially dangerous heat that will lead to increased heat-related impacts.
Latent Heat
Heat absorbed or released during a change of phase at constant temperature and pressure.
Latent Heat Flux
The 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 Flux
The 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 Island
The increased air temperatures in urban areas in contrast to cooler surrounding rural areas.

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