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LAKE EFFECT SNOW QUESTIONS

METEOROLOGIST JEFF HABY

Is wind directional change with height less than 30 from surface to 850 millibars and less than 60 from the surface to 700 millibars? Question#1
Is the average lake water temperature greater than 13 C more than the 850 mb temperature AND is lake unfrozen? Question#2
Is the height of the inversion (depth of arctic air) above the 700 millibar level? Question#3
Is the average PBL windspeed between 10 mph and 45 mph? Question#4
Is the fetch of wind over the lake greater than 100 kilometers? Question#5
Does significant orographic lifting occur downwind from the lake? Question#6
Is the average PBL temperature below freezing Question#7


The more questions that are answered YES, the greater the likelihood for heavy lake effect snow.