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Organized severe weather occurs under the same conditions that generate ordinary thunderstorms: atmospheric moisture, lift (often from thermals), and instability. [9] A wide variety of conditions cause severe weather. Several factors can convert thunderstorms into severe weather.
A severe thunderstorm warning is issued if a thunderstorm becomes severe, or will soon turn severe. In Canada, a rainfall rate greater than 50 millimetres (2 in) in one hour, or 75 millimetres (3 in) in three hours, is also used to indicate severe thunderstorms. [38] Severe thunderstorms can occur from any type of storm cell. However, multicell ...
Severe thunderstorms can and occasionally do produce tornadoes without warning. [2] While not all severe thunderstorms produce tornadoes, they can produce serious straight line wind damage as severe as a lower-category tornado or hurricane, and can actually cover a much wider area than that exceeded by a tornado's comparatively narrow path ...
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.
This process cause thunderstorm formation (and decay) to last for several hours or even over multiple days. Cumulonimbus clouds can also occur as dangerous winter storms called "thundersnow" which are associated with particularly intense snowfall rates and with blizzard conditions when accompanied by strong winds that further reduce visibility.
Oftentimes, this setup produces severe thunderstorms along the northern edges of the heat." In 2023, AccuWeather unveiled its new heat wave index to help convey the danger of heat waves, including ...
The most significant storms are possible starting in the afternoon in parts of the southern and central Plains, where a Level 3 of 5 risk of severe thunderstorms is in place.
A derecho (/ ˈ d ɛ r ə tʃ oʊ /, from Spanish: derecho [deˈɾetʃo], 'straight') [1] is a widespread, long-lived, straight-line wind storm that is associated with a fast-moving group of severe thunderstorms known as a mesoscale convective system. [2] Derechos cause hurricane-force winds, heavy rains, and flash floods.