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12-29 Storm Threat and Obs


UlsterCountySnowZ

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Looks like a quick hitter as the developing low center swings around the parent low.  I suppose the evolution could change if the secondary mid-level center developed much sooner, but a drastic change is probably unlikely.  But it is starting to look like there could be a short period of moderate or heavy precipitation.  I'll be down in southern Dutchess for this one.  I think surface temperatures in the lower elevations could limit snow.  It's exciting to at least have something to track.

Further northeast and elevated is probably best this time around.

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The JMA is impressive.  It develops the mid levels really early and the surface low starts deepening rapidly in the mid-atlantic.  It looks like it would bring significant precip to the whole area (snow in the NW burbs) with comparatively mature wraparound circulation axis right through the lower and mid-HV.

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The JMA is the only model that gets the mid-levels going fast enough to impact the area with wraparound precip.  The Euro is close but mostly just a little late.  The JMA has a mature 700mb circulation as the bombing low passes NYC's latitude.  The JMA is probably too optimistic with respect to the mid-levels, but it's exactly what we'd want to see (save for some boundary layer problems early on).  And most guidance seems to be trending in this direction.

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