Georgia's peak severe thunderstorm season is March, April and May. How strong does the updraft need to be for the various sizes of hail? The table (right) (above) provides the approximate speed for each size. When a thunderstorm reaches 'severe' limits, it has intensified to the point that it will produce wind gusts of at least 58 mph and/or hail 1 inch in diameter (about the size of a quarter) or larger. In all cases, the hail falls when the thunderstorm's updraft can no longer support the weight of the ice. Weather Underground, also called Weather Underground Organization, formerly Weatherman, militant group of young white Americans formed in 1969 that grew out of the anti-Vietnam War movement. The stronger the updraft the larger the hailstone can grow. However, the sustained updraft in supercell thunderstorms support large hail formation by repeatedly lifting the hailstones into the very cold air at the top of the thunderstorm cloud. The reason is that the mature stage in the life cycle of the multi-cell is relatively short which decreases the time for growth. Multi-cell thunderstorms produce many hail storms but usually not the largest hailstones.
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