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A period of weather characterized by excessively high temperatures, which may or may not be accompanied by high humidity or by drought. Very hot weather is often only referred to as a heat wave if the temperature is abnormal relative to the typical climate for a given location during a given season. Contrast cold wave. heavy snow warning
A high pressure system in the upper atmosphere traps heat near the ground, forming a heat wave (for North America in this example). 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.
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
Extreme weather describes unusual weather events that are at the extremes of the historical distribution for a given area. [2]: 2908 The IPCC Sixth Assessment Report defines an extreme weather event as follows: "An event that is rare at a particular place and time of year. Definitions of 'rare' vary, but an extreme weather event would normally ...
Severe weather is one type of extreme weather, which includes unexpected, unusual, severe, or unseasonal weather and is by definition rare for that location or time of the year. [5] Due to the effects of climate change , the frequency and intensity of some of the extreme weather events are increasing, for example, heatwaves and droughts .
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Although 14 August was the final day of the extremely hot weather, temperatures remained above the seasonal average into the following day. On 15 August, heavy rain and thunderstorms moved across the UK. The Met Office issued three days of weather alerts for 15, 16 and 17 August, warning of a risk of flash flooding in some areas. [72]
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