Wx Talk Webinar #62


 



Webinar #62 - Thursday, September 20, 2018

Graupel and Hail -- What they are, how they form, and how they fall
Andy Heymsfield
NCAR
Boulder, Colorado


(Biography)

Andy will provide an overview of where these particles are most prevalent geographically. He will then discuss the basic physical properties of graupel (small hail) and hail, including their mass and sizes. Next will discuss field programs that have been mounted to characterize hail properties, from in-situ aircraft measurements and at the ground. This will lead into a discussion of how hail forms and attempts in the past to reduce hailfall. Also discussed will be how damage from hail has been tested in the laboratory and at the ground. Finally, Andy will conclude by discussing how fast these particles fall and with what energy they impact the ground (kinetic energy).

Where the Hail Does (It) Occur and How the Hail Does (It) Happen
Overview of Hail Occurrence
Basic Characteristics of Hail and Graupel
How Hail is Observed
Hail Suppression Experiments
Aircraft measurements inside of hailstorms
How Hail Forms
Hail Impact Testing
Hail Terminal Velocities and Kinetic Energies




View the Webinar by clicking here: Andy's Webinar


View Andy's presentation slides  (coming soon)


Resources:

Storm Surge Overview:  https://www.nhc.noaa.gov/surge/
Frequently Asked Questions:  https://www.nhc.noaa.gov/surge/faq.php
Storm Surge Unit Team:  https://www.nhc.noaa.gov/surge/ssu.php

And for the GIS users in the audience, here is our database of archived NHC Data in GIS Format, including Storm Surge Products:  https://www.nhc.noaa.gov/gis/