Hailstones can grow to 15 cm (6 in) and weigh more than 0.5 kg (1.1 lb). An ice crystal with a diameter of >5 mm (0.20 in) is considered a hailstone. Severe weather warnings are issued for hail when the stones reach a damaging size, as it can cause serious damage to human-made structures, and, most commonly, farmers' crops.Īny thunderstorm which produces hail that reaches the ground is known as a hailstorm. Hailstones generally fall at higher speeds as they grow in size, though complicating factors such as melting, friction with air, wind, and interaction with rain and other hailstones can slow their descent through Earth's atmosphere. There are methods available to detect hail-producing thunderstorms using weather satellites and weather radar imagery.
In the mid-latitudes, hail forms near the interiors of continents, while, in the tropics, it tends to be confined to high elevations. Hail formation requires environments of strong, upward motion of air within the parent thunderstorm (similar to tornadoes) and lowered heights of the freezing level. Hail is possible within most thunderstorms (as it is produced by cumulonimbus), as well as within 2 nmi (3.7 km) of the parent storm.
#STRIKE DEFINITION IN ENGLISH CODE#
The METAR reporting code for hail 5 mm (0.20 in) or greater is GR, while smaller hailstones and graupel are coded GS. Unlike other forms of water ice precipitation, such as graupel (which is made of rime ice), ice pellets (which are smaller and translucent), and snow (which consists of tiny, delicately crystalline flakes or needles), hailstones usually measure between 5 mm (0.2 in) and 15 cm (6 in) in diameter. Ice pellets generally fall in cold weather, while hail growth is greatly inhibited during low surface temperatures. It consists of balls or irregular lumps of ice, each of which is called a hailstone. It is distinct from ice pellets (American English "sleet"), though the two are often confused.
Demonstrators will attempt to surround the police, strike up conversations and present them with letters.I recalled he had struck up an intimate conversation with her in the lobby after breakfast.The orchestra struck up a polonaise, the lights strung on trees glistened in the garden, the tables groaned with food.Peggy and James strike up a friendship.Alone and friendless, she had struck up a casual friendship with Dermot as he showed her Dublin.→ strike → See Verb table Examples from the Corpus strike up 2 strike up (something) APM to begin playing a piece of music The band struck up a tango. From Longman Dictionary of Contemporary English strike up phrasal verb 1 strike up a friendship/relationship/conversation etc FRIENDLY to start to become friendly with someone, to start talking to them, etc I struck up a conversation with the girl sitting next to me.
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