Snowsqualls are a form of severe convection where cold air is directed over warm open water. The intake of heat and moisture from the water surface fuels parallel bands of cumulus convection. Typically the cumulus towers get up to 12000 feet above the ground but can reach even to 25000 producing thundersnow with a thunderstorm. The distance between these bands is determined by the height of the capping layer.
There is much to know about forecasting snowsqualls as they are influenced by upslope, downslope, friction, shoreline shape, frictional convergence, atmospheric lift and even daytime heating. If you know the wind direction and the temperatures involved a meteorologist can give a really accurate long range prediction of the snowsqualls owing mainly yo the fact that the geography of the lake and the land does not change. If that geography does change though we have much bigger problems beside snowfall rates of 10 to 20 cm an hour. Snowsqualls will remain locked in until something changes - most typically the wind direction.
Driving in snowsqualls is dangerous beyond belief. One minute you can be driving safely along with blue skies and great visibility and the next you will not be able to see the hood of your car. Penetrating the side wall of a snowsquall like the one in the above picture might sound like an exciting thing to do but think again. Not everyone slows downs or stops at the same rate and collisions are a certainly. Simply do not drive into a snowsquall. Get off the road and find a safe location.
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