It is important to understand how hail forms and how it is modified by convective processes in the atmosphere. Several meteorological instability parameters affect the size of hail. Potential energy in the atmosphere, wind shear, cloud base levels all have an influence on how a hail stone forms. In this project, fifty thunderstorms that have developed in Kansas, Oklahoma, and Nebraska over the past eight years are investigated. The thunderstorms are classified by the measured hail size. Half of the thunderstorms have large hail with a diameter of one inch or greater and the small hail events have hail less then one inch. After the severe thunderstorms have been chosen, five parameters (CAPE, updraft velocity, Lifting Condensation Level, SWEAT value, and the Equilibrium Level) are evaluated for their influence on hail by using a two sample t test, confidence limits, and khi squared.
|Presenter:||Kristin Bremer (Undergraduate Student)|
|Time:||10:45 am Session II|
American Democracy Project Lecture: Janet Poppendieck
5 pm - 5:45 pm