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April 12 wintry event.


CoastalWx

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Temps may actually rise later this evening or at night tonight when the low scoots by and the wind comes around.  This system was front side cold loaded from that push that came south late yesterday. But current sfc obs showing mid 40 to low 50s common throughout the OV and that air is getting wrapped into the back side as the low escapes.

 

In an way ... if I am to understand these "SW flow events" this is a cold rain/sleet version of that -- although a bit more commitment to secondary may eventually pull this underneath, but that's after the shut-off this evening.   And, likewise, it is not uncommon on the backside of those types of system to have a markedly warmer day.   

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The snow obs are all in the back third of the precip...so I think Scooter and I's explanation of most of the lift being below 850mb explains it well. There were some very cold temps in that 900mb range...enough to produce ice crystals.

 

It was actually decent flakes for about 15 minutes (around 1pm) even in downtown Greenfield which is only at about 250'. 

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