Playing a critical role in the initiation of the event is a convergence zone that separates strong westerly flow over the western Great Salt Lake from weak or easterly flow over Antelope Island and the northern Wasatch Front. This convergence zone shows up very well in the surface plot below and extends from just southwest of Promontory Point into the Salt Lake Valley.
I'm still thinking the lake effect will weaken and become more widely scattered with time (see previous post), but if I'm wrong, I won't complain.
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