Hail is a form of solid precipitation. It is distinct from ice pellets (American sleet), though the two are often confused. It consists of balls or irregular lumps of ice, each of which is called a hailstone. Ice pellets (American sleet) fall generally in cold weather while hail growth is greatly inhibited during cold surface temperatures.
Unlike other forms of water ice such as graupel, which is made of rime, and ice pellets, which are smaller and translucent, hailstones usually measure between 5 millimetres (0.2 in) and 15 centimetres (6 in) in diameter. The METAR reporting code for hail 5 mm (0.20 in) or greater is GR, while smaller hailstones and graupel are coded GS.
Hail is possible within most thunderstorms as it is produced by cumulonimbus, and within 2 nautical miles (3.7 km) of the parent storm. Hail formation requires environments of strong, upward motion of air with the parent thunderstorm (similar to tornadoes) and lowered heights of the freezing level. In the mid-latitudes, hail forms near the interiors of continents, while in the tropics, it tends to be confined to high elevations.
There are methods available to detect hail-producing thunderstorms using weather satellites and weather radar imagery. 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. 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.
Balls or pieces of ice falling as precipitation, often in connection with a thunderstorm.
Said of the weather when hail is falling.
“They say it’s going to hail tomorrow.”
To send or release hail.
“The cloud would hail down furiously within a few minutes.”
To pour down in rapid succession.
to greet; give salutation to; salute.
To name; to designate; to call.
“He was hailed as a hero.”
to call out loudly in order to gain the attention of
“Hail a taxi.”
Healthy, whole, safe.
An exclamation of respectful or reverent salutation, or, occasionally, of familiar greeting.
Pellets of ice made of mostly frozen raindrops or refrozen melted snowflakes.
A mixture of rain and snow.
A smooth coating of ice formed on ground or other objects by freezing rain.
Part of a mortar extending from the chamber to the trunnions.
To be in a state in which sleet is falling.
“I won’t bother going out until it’s stopped sleeting.”