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About Hail...


Cheyenne, Wyoming is the most hail-prone city in the US, receiving an average of 9 to 10 hailstorms per season.

The area where Colorado, Nebraska, and Wyoming meet is called Hail Alley, with storms occuring from March through October, but mostly from May to September.

The largest hailstone on record in the US fell in Vivian, SD on July 23rd, 2010 measuring 8" in diameter and weighing 1.93 lbs.

About Hail...



is most often between .2" and 5.9",

is produced by cumulonimbi clouds, usually at the leading edge of a severe storm system,

can occur up to 2 miles from it's parent storm,

is covered by National Weather Service warnings when it reaches an inch or more in diameter,

is most common in the interior of continents and within the mid latitudes.

and is more common around mountain ranges due to updrafts from mountains forcing horizontal winds upward.

About Hail...

How is Hail Formed?

Hail is formed when supercooled waterdroplets freeze on condensation nuclei.  The baby hailstone is then carried up with the storm's updrafts until the updrafts diminish and it falls again.  This pattern repeats and the hailstone continues to collect layers and layers of ice in layers.  Soon it becomes too large for the updrafts to lift and it falls to earth as hail.  The winds within the storm can reach 110 mph.   The larger hailstones appear like balls or clumps of ice and can look like a bunch of small hailstones frozen together.  

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