How Does Hail Form? - Central Region Headquarters - NOAA - crh noaa 2025

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  1. Click ‘Get Form’ to open it in the editor.
  2. Begin by reviewing the introduction section, which explains the formation of hail. This will provide context for filling out any related fields.
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Hail formation starts with thunderstorms. The first two things that must be present are strong updrafts of warm air and downdrafts of cold air. These strong currents of air are typical in Cumulonimbus clouds. These clouds are the massive anvil or mushroom shaped clouds you see during thunderstorms.
Heres a look at a watered down explanation; water droplets are carried up the updraft and cool down once they pass the freezing line in thunderstorms. While staying in the updraft, the hailstones get bigger and bigger over time. Once theyre too heavy to stay in the thunderstorms updraft, the hailstones will fall.
Note: To be considered severe, hail stones must be at least 1 inch in diameter. Small Hail - Hail less than 1 inch in diameter (from the size of peas to nickels). Large Hail - Hail from 1 inch to 1 3/4 inch in diameter (from the size of quarters to golf balls) causing minor damage.
Hail forms inside of cumulonimbus clouds (cumulonimbus clouds are anvil shaped and usually thunderstorm-producing clouds) when there is a strong updraft to carry graupel pellets back up into the cloud. [Graupel is simply frozen raindrops, similar to sleet].
The days that have hail also have relatively warm air temperatures (mostly in the 50-90F range, which is above the melting/freezing point of water) and relative humidity in the range of 37-96 percent.
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Hail can be detected using radar. On Doppler radar, hail generally sends a return signal that looks like extremely heavy rainfall. Dual-polarization radar technology, used by the NWS, can help tell the difference between hail, ice pellets and rain, and even determine hail size.

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