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And we're off - first threat for a few mangled flakes


earthlight

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43 deg. up here at KSWF.

Yeah it's getting cold up here. Dropping into the low 40s up in the Valley. Valleys not much warmer than ridge towns. Monticello 41, Poughkeepsie 42. Binghampton 39, Pittsfield 38, Albany 38. More of a north/south gradient. And it's mid-day. Probably some snow now in the Catskills. Adirondack high peaks dropping through the 20s. Mt Washington in the teens. Chilly airmass moving in right before a possible coastal storm!

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Looking at the skew t and text output, this is not supported till the very end, but hey, I'm hopeful.

It wouldn't be snow at the temps indicated, but the warm layer at the ground must be very thin. The large GFS grid size might not take into account cooling like the Euro may. In CAD situations, the GFS is always the least preferable model to use. It could very easily really be 35 or 34F, and the large GFS grids might not see it or "smooth" it out.

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Yeah it's getting cold up here. Dropping into the low 40s up in the Valley. Valleys not much warmer than ridge towns. Monticello 41, Poughkeepsie 42. Binghampton 39, Pittsfield 38, Albany 38. More of a north/south gradient. And it's mid-day. Probably some snow now in the Catskills. Adirondack high peaks dropping through the 20s. Mt Washington in the teens. Chilly airmass moving in right before a possible coastal storm!

Yeah down to 40* here..

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Game on, boys.

It looks like every GFS ensemble member is west and probably wetter than the operational. And the majority of them show nearly perfect tracks. HPC progs are going to show a high probability of 1" snow for the PHL and NYC immediate NW burbs. And the individual offices will have to take notice. Below 1000ft, snowfall accumulations could double every 200ft (.5, 1, 2, 4, 8). If the GFS/UK/Euro are correct, many towns from SEPa to EMa would break their pre-December snowfall records.

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It looks like every GFS ensemble member is west and probably wetter than the operational. And the majority of them show nearly perfect tracks. HPC progs are going to show a high probability of 1" snow for the PHL and NYC immediate NW burbs. And the individual offices will have to take notice. Below 1000ft, snowfall accumulations could double every 200ft (.5, 1, 2, 4, 8). If the GFS/UK/Euro are correct, many towns from SEPa to EMa would break their pre-December snowfall records.

you really think 200 feet will make that much a difference? i thought 500 feet was usually where the significant differences started

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Not surprised the ptype would be listed as snow with those low 1000-500mb thickness values. 530s!! And I don't doubt that it would be mostly wet snow/mix. But surface temps are really warm. Even the minimum values. Huge parachute flakes would accumulate at 36F. But Yonkers or Patterson, NJ could fair so much better than Manhattan.

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