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The heat index (HI) is an index that combines air temperature and relative humidity, in shaded areas, to posit a human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. For example, when the temperature is 32 °C (90 °F) with 70% relative humidity, the heat index is 41 °C (106 °F ...
PHOENIX - The National Weather Service says parts of the state, including Phoenix, can expect record-breaking heat in the days ahead.. The high was 109°F on Thursday. Temps are expected to be 110 ...
Excessive heat watch (NPW) – Conditions are favorable for an excessive heat event with extreme Heat Index values during the day, combined with nighttime low temperatures of 80 °F (27 °C) or higher that limit perspiration recovery, are forecast to occur to meet or exceed local Excessive Heat Warning criteria in the next 24 to 72 hours.
New Hanover, Brunswick and Pender counties can expect heat index values up to 106 degrees between 11 a.m. and 8 p.m. on Wednesday, according to the National Weather Service heat advisory.
Dimension. Index calculated to be similar to a temperature. Apparent temperature, also known as " feels like ", [1][2] is the temperature equivalent perceived by humans, caused by the combined effects of air temperature, relative humidity and wind speed. The measure is most commonly applied to the perceived outdoor temperature.
An Excessive Heat Warning is issued if the heat index, which factors in humidity, is forecast to reach 105°F or higher for at least two consecutive days, with nighttime temperatures remaining ...
In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes. [14]