Prediction of hail
Note: hail rolled narrow (only a few kilometers), but wide (more than 100 km) strip of only a pile of rain-clouds with strong vertical development, hail usually occurs during thunderstorms.
Over the Clouds
Especially if a large cumulus cloud with a strong vertical development becomes "anvil" or "mushroom" (that is expanding with height), while throwing vane cirrus and / or cirrostratus clouds (a kind of "brush" over the "anvil") — possibly hail. Moreover, the probability of hail is higher, the higher the altitude clouds.
Movement of high clouds, deviating to the left in relation to the movement of the lower — a sign of approaching cold front, usually brings with it heavy rain, followed by an hour of hail and / or thunderstorms. After the passage of the front wind at ground level also turns to the left, and then sometimes followed by a brief clarification.
If the edges of thunderstorm clouds (cumulus clouds with strong vertical development) noticeable characteristic white stripes, and behind them — scattered clouds ashen — expect hail.
If, due to raise the wind, thunder cloud will spread, changing the vertical development of the horizontal — breathe easy. The threat of hail (and probably rain) over.
If you go during the storm of noise large dark clouds — will hail, and the same thing, if the clouds are dark blue, and among them are white.