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. In all cases, the hail falls when the thunderstorm's updraft can no longer support the weight of the ice. 6 hours ago &0183 &32 The Met Office has issued a yellow weather thunderstorm alert for much of the UK, warning that driving conditions will likely be affected by spray, standing water or hail. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Hail. The stronger the updraft the larger the hailstone can grow. Due to changes in the data collection and processing procedures over time, there are unique periods of record available depending on the event type. 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 database currently contains data from January 1950 to January 2023, as entered by NOAA's National Weather Service (NWS). 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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