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A definition based on the Heat Wave Duration Index is that a heat wave occurs when the daily maximum temperature of more than five consecutive days exceeds the average maximum temperature by 5 °C (9 °F), the normal period being 1961–1990. [9] The same definition is used by the World Meteorological Organization. [10]
Also actiniform. Describing a collection of low-lying, radially structured clouds with distinct shapes (resembling leaves or wheels in satellite imagery), and typically organized in extensive mesoscale fields over marine environments. They are closely related to and sometimes considered a variant of stratocumulus clouds. actinometer A scientific instrument used to measure the heating power of ...
An example of weather alerts on a national map from the National Weather Service The NWS divides severe weather alerts into several types of hazardous/hydrologic events: Severe local storms – Short-fused, small-scale hazardous weather or hydrologic events produced by thunderstorms (including large hail , damaging winds , tornadoes , and flash ...
Stifling heat blanketed tens of millions of people in United States on Tuesday, forcing people and even zoo animals to find ways to cool down as summer arrives in what promises to be a sweltering ...
Hundreds more people were evacuated from their homes as wildfires blistered land in France, Spain and Portugal on Friday, and officials in Europe issued health warnings for the heatwave in coming ...
A record-breaking heat wave is about to send temperatures soaring from California to the Gulf of Mexico, posing health risks and straining power grids for days to come. (Sergio Flores / Bloomberg ...
A tornado is an example of an extreme weather event. This tornado struck Anadarko, Oklahoma during a tornado outbreak in 1999.. Extreme weather includes unexpected, unusual, severe, or unseasonal weather; weather at the extremes of the historical distribution—the range that has been seen in the past.
A brutal heat wave scorched a large swath of the U.S. on Wednesday, with millions from the Midwest to the Northeast enduring sweltering temperatures during the Juneteenth holiday.