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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 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.
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]
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 ...
Issued for severe surface weather (including surface winds greater than or equal to 50 knots (93 km/h; 58 mph), hail at the surface greater than or equal to 3 ⁄ 4 inch (19 mm) in diameter, or tornadoes); embedded thunderstorms; line of thunderstorms; thunderstorms greater than or equal to VIP level 4 affecting 40% or more of an area at least ...
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
Cumulonimbus are a notable hazard to aviation due most importantly to potent wind currents but also reduced visibility and lightning, as well as icing and hail if flying inside the cloud. Within and in the vicinity of thunderstorms there is significant turbulence and clear-air turbulence (particularly downwind ), respectively.