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January 19-20th Winter Storm Threat


Rjay

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  On 1/16/2019 at 4:21 PM, NEG NAO said:

so if they are garbage - what actually ppens in your opinion ?

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So a lot of what the GGEM is showing as plain rain over interior NJ and the Hudson Valley is actually freezing rain. It's a solid front end dump of 3-6, 4-8" before the warming takes over aloft. But the surface cold hangs strong. It's a thump to freezing rain, possibly changing back to snow as the system pulls away late Sunday.

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  On 1/16/2019 at 4:23 PM, NJwx85 said:

So a lot of what the GGEM is showing as plain rain over interior NJ and the Hudson Valley is actually freezing rain. It's a solid front end dump of 3-6, 4-8" before the warming takes over aloft. But the surface cold hangs strong. It's a thump to freezing rain, possibly changing back to snow as the system pulls away late Sunday.

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I would say that analyses stays on the table - as a possible outcome

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One key thing to keep in mind if it looks like a heavy freezing rain scenario.  The one partial saving grace in this scenario would be if we get a front end thump of several inches of snow everywhere before a change to ZR, such that freezing rain falling into a snowpack would simply be absorbed and wouldn’t coat all sub-32F surfaces with ice.  In this scenario, it may sound odd, but it would probably be better to now shovel/plow, if possible (which is likely a non-starter for roads, lol, but that'll absolutely be what I do with my sidewalk and driveway), so that any ZR falls into the snowpack.  Having the rain falling into the snowpack will lead to a slushy mess that probably freezes slowly (remember freezing adds a little heat to the surroundings) and not as a pure ice glaze.  So root for snow before freezing rain.   Trees and powerlines could still be vulnerable, especially as the snow may not stick well to them.   

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