How does hail originate?

So that hail can originate different conditions must exist:

  • Storm clouds or a thunderstorm cell
  • Some crystallization cores (From it there originate the hailstones, because the water freezes in them)
  • Enough water (hailstones need "food" to grow)
  • Strong upward winds (are responsible for the growth of hailstones)

If the abovementioned factors apply, one can fancy the hail education about so:

We have a storm cloud in which the so-called crystallization cores are to be found. In the storm cloud dominate according to layer, different temperatures; moreover, enough water must exist, so that within short time enough water can freeze in the crystallization cores. So that the hailstones will be able to grow, nevertheless, upward winds are needed. The hailstones are carried by the upward winds over and over again by different temperature areas of the storm cloud. By constant warming up and then again cooling, more and more water can be collected in the crystallization cores or rather freeze. At sometime the hailstone is too hard around is to be carried by the upward wind again upwards and it falls to ground!

We have Hail!!!

Size and rate of fall

The size and rate of fall of hailstones strongly varies, because it dependents strongly on the size of the hailstone. Thus a hailstone with 10 mm of diameter and a weight of 0.5 g falls with approx.  50 km/h to ground, while a hailstone with a diameter of 80 mm and a weight of approx. 220 g falls with approx. 135 km/h to ground!!!

Damages to vehicles originate from a hailstone of approx. 2 cm of diameter.

How often do we have hail?

In the last both decades number of the hail days has had an increase about 600%. Researchers suppose that this huge increase goes on account of the climate change!