Instability - Used to look at temperature difference between the lake and 850 mb temperature being 13 degrees Celsius or greater to develop LES bands. Nakaya Diagram show snow crystal type as a function of temperature and supersaturation.
Yellow area denotes most favored area for dendritic growth, graupel and riming.
Graupel forms in regions of rapid ascent. Dendrites form near -15 degrees Celsius. This illustartes the importance of starting with a relatively high RH in the PBL to achieve riming. For Lake Ontario the fetch is not maximized and the angle of the wind with respect to the major axis of the lake is greater than 30 degrees, therefore multiple bands occur. 10 Fetch 2 - Imagine a trough moves in from the west, changing the wind direction to westerlies starting in the west.