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A heat wave or heatwave, sometimes described as extreme heat, is a period of abnormally hot weather [1]: 2911 generally considered to be at least five consecutive days. A heat wave is usually measured relative to the usual climate in the area and to normal temperatures for the season. [2]
An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time.
The main types of extreme weather include heat waves, cold waves and heavy precipitation or storm events, such as tropical cyclones. The effects of extreme weather events are economic costs, loss of human lives, droughts, floods, landslides. Severe weather is a particular type of extreme weather which poses risks to life and property.
Extreme caution: When the heat index is 90-103 degrees, the body may feel heat stroke, heat cramps and heat exhaustion with prolonged exposure and physical activity.
Find out how extreme heat can negatively affect diabetics, and how to stay safe in the summer. Managing diabetes is even harder when temperatures and humidity are rising. Find out how extreme heat ...
A heat dome is a weather phenomenon consisting of extreme heat that is caused when the atmosphere traps hot air as if bounded by a lid or cap. Heat domes happen when strong high pressure atmospheric conditions remain stationary for an unusual amount of time, preventing convection and precipitation and keeping hot air "trapped" within a region.
Extreme heat is a global issue too. High temperatures are taking a toll abroad, prompting health alerts in a number of countries and causing hundreds of fatalities in Saudi Arabia.
This extreme heat has also resulted in a 'flash' drought across southern and central areas of the country and has sparked several massive wildfires due to periodic high winds. [44] In late June 2013, an intense heat wave struck the Southwestern United States. Various places in Southern California reached up to 50 °C (122 °F). [45]