1. Supplemental Slide Set
USPS® Weather Course
Hail
Supplemental Slide Set
Hail

2. Hail Storm Hail Storm Calgary, Alberta Canada Hail Storm
Hail storm in Calgary.
Copyright Abi Howe, American Geological Institute. Reprinted with permission.

3. Large Hail in Severe Thunderstorm
Large hail collects on streets and grass during severe thunderstorm.
Larger storms appear to be nearly 2 to 3 inches in diameter.
Copyright National Oceanic and Atmospheric Administration.

4. Aggregate Hailstone Aggregate Hailstone
Aggregate hailstone - large hailstone with smaller stones visible.
Ruler shows radiusof this remarkable hailstone - diameter is approximately 6 inches. - the size of a grapefruit.
Copyright National Oceanic and Atmospheric Administration.

5. Softball Sized Hailstone
Large hailstone with diameter of approximately 4” (softball size).
Smaller stones are collected together to form this large stone.
Copyright National Oceanic and Atmospheric Administration.

6. Hailstones Hailstones Golf ball sized hail.
Photo taken April 9, 1978 near Roosevelt, Oklahoma.
Copyright National Oceanic and Atmospheric Administration.

7. Baseball Sized Hail Baseball Sized Hail From Project Vortex - Probe 5.
Baseball sized hail from severe thunderstorm.
Photo taken June 8, 1995, somewhere in Texas.
Copyright National Oceanic and Atmospheric Administration.