DISCUSSION: As strong fired across parts of central and south-central Europe during the day on Sunday, there was a substantial threat for severe weather to unfold. Due to the presence of warm temperatures, a high concentration of low/mid-level moisture, and strong convective instability, there was a very conducive regional atmospheric environment for deep convective storms. As these storms formed and intensified substantially, the increased strength of core updrafts facilitated ice particles to remain suspended within the storms for a longer period of time. Hence, as the ice particles remain suspended for a longer period of time, this allowed to grow in size to the point at which they were too heavy to remain suspended within the most intense part of the thunderstorm. Thus, the end-result was a large quantity of relatively large hail stones (i.e., hailstones with diameters of greater than 1") falling to the ground.
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©2017 Meteorologist Jordan Rabinowitz