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Any thunderstorm which produces hail that reaches the ground is known as a hailstorm. [5] An ice crystal with a diameter of >5 mm (0.20 in) is considered a hailstone . [ 4 ] Hailstones can grow to 15 cm (6 in) and weigh more than 0.5 kg (1.1 lb).
Severe is defined as hail 1 to 2 inches (25 to 51 mm) diameter, winds 58 to 75 miles per hour (93 to 121 km/h), or a tornado. [11] Significant severe is defined as hail 2 inches (51 mm) in diameter or larger, winds 75 mph (65 knots, 120 km/h) or more, or a tornado of strength EF2 or stronger. [1] [12]
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.
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 ...
Any thunderstorm that produces hail that reaches the ground is known as a hailstorm. [61] Thunderclouds that are capable of producing hailstones are often seen obtaining green coloration. Hail is more common along mountain ranges because mountains force horizontal winds upwards (known as orographic lifting ), thereby intensifying the updrafts ...
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The 1490 Qingyang event may have been due to a large comet breaking up in the atmosphere, or a hail storm. Sources generally considered reliable say more than 10,000 killed, but the official History of Ming does not give a number of casualties. [60] [61] [62] 30 April 1888 Moradabad (Uttar Pradesh), Northern India
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