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NYC/PHL Jan 18-19 Potential Threat Thread


am19psu

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yea... I'm not quite understanding why the 32 line on the surface temps is so far north with this set-up.. With a coastal well east of the area, I would expect a surface wind off the land and would not expect a freezing rain/sleet situation that it depicting in the CCB part of the storm. I would think temps of 32-35 with wet snow for most n&w burbs

Looks like the second round gets the NW burbs! Why do the 850s spike so much with the first low pressure system? Seems odd..

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It seems the low west of the coastal storm is the main culprit and could be the big screw up in what could've been another snow event. I just hope it trends weaker or is further to the west. If the low to the west is weaker or further west, then I see no reason why the coastal can't tap in the cold air around it and give us snow.

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My area (N-Central NJ) has an expected high of 26 on Monday and with a system looking more like a coastal than a cutter I would be shocked to see regular rain..A snow/sleet/Freezing Rain situation will make traveling awful Tues Morning.. Than another storm chance Fri-Sat not bad at all..This winter is starting to look like it could be epic..

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It seems the low west of the coastal storm is the main culprit and could be the big screw up in what could've been another snow event. I just hope it trends weaker or is further to the west. If the low to the west is weaker or further west, then I see no reason why the coastal can't tap in the cold air around it and give us snow.

This is becoming really interesting.If this depiction is right on the GFS, I would think the surface temps and 850's would be a little colder near the coast, due to the storm bombing out near the BM and the snowpack.

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cant win, first we miss snow mid week for being too warm, then we miss snow for being too cold

Still plenty of time and potential the euro has been consistent with this threat. The peak of the cold does indeed look to be Fri - Sun (1/21 - 1/23). Beyond there cold holds and all it will take is a clipper to bomb out ....

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The 12z GFS depiction portrays two areas of LP, which will have a large impact on the forecast for our area. What has become more and more apparent with time is that models continue to show some resemblance of blocking upstream, which allows for confluence to remain over the area for longer. This area of HP prevents the primary low in the OV from cutting like originally anticipated and instead stalls its northward progress, and as the GFS shows almost pushes it E under the HP. The current depiction stills allows enough northward progress so that hghts ahead of the primary rise on the east coast associated with WAA. That is the reason why even with the GFS having a good coastal track it remains a bit warm, as some have asked. The primary steals the show essentially. What we need to see progressing forward for this solution to become more favorable is increased confluence remaining over the region in association with the psuedo 50/50 which prevents the primary progression N. I see a few possible outcomes. The primary is squashed and phases into the secondary allowing the cold air to flow into the region with secondary cycologenisis. Another outcome would be the LP in the SE US simply moves OTS and the LP over the OV moves into the area in a clippper like fashion with a fresh blast of cooler air, but no connection between the two systems occurs. Or third, models are overestimating the blocking and confluence and the primary cuts allowing for significant WAA and a nice soaking.

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The 12z GFS depiction portrays two areas of LP, which will have a large impact on the forecast for our area. What has become more and more apparent with time is that models continue to show some resemblance of blocking upstream, which allows for confluence to remain over the area for longer. This area of HP prevents the primary low in the OV from cutting like originally anticipated and instead stalls its northward progress, and as the GFS shows almost pushes it E under the HP. The current depiction stills allows enough northward progress so that hghts ahead of the primary rise on the east coast associated with WAA. That is the reason why even with the GFS having a good coastal track it remains a bit warm, as some have asked. The primary steals the show essentially. What we need to see progressing forward for this solution to become more favorable is increased confluence remaining over the region in association with the psuedo 50/50 which prevents the primary progression N. I see a few possible outcomes. The primary is squashed and phases into the secondary allowing the cold air to flow into the region with secondary cycologenisis. Another outcome would be the LP in the SE US simply moves OTS and the LP over the OV moves into the area in a clippper like fashion with a fresh blast of cooler air, but no connection between the two systems occurs. Or third, models are overestimating the blocking and confluence and the primary cuts allowing for significant WAA and a nice soaking.

good summary.. My approach to the last option is basically "I dare you to cut the lakes and soak us". I'd be surprised if it did and would be willing to take a chance that there is zero percent chance of this happenng. I almost look at this similarly to those blocky patterns we sometimes get in the spring where we get stuck in a fog bowl for like 5 days and the models keep predicting a break, but it never actually happens... so then you basically foreast a persistant pattern until it actually ends up breaking for real. Given the current pattern, I'll live and die by the sword and say there is no way this cuts and we get a soaking rain with temps in the 40's.

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good summary.. My approach to the last option is basically "I dare you to cut the lakes and soak us". I'd be surprised if it did and would be willing to take a chance that there is zero percent chance of this happenng. I almost look at this similarly to those blocky patterns we sometimes get in the spring where we get stuck in a fog bowl for like 5 days and the models keep predicting a break, but it never actually happens... so then you basically foreast a persistant pattern until it actually ends up breaking for real. Given the current pattern, I'll live and die by the sword and say there is no way this cuts and we get a soaking rain with temps in the 40's.

... and if I'm completely wrong it's ok.. I'll take it in the chin :thumbsup: , but given the wide array of potential solution, I will go with one and stick it out

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good summary.. My approach to the last option is basically "I dare you to cut the lakes and soak us". I'd be surprised if it did and would be willing to take a chance that there is zero percent chance of this happenng. I almost look at this similarly to those blocky patterns we sometimes get in the spring where we get stuck in a fog bowl for like 5 days and the models keep predicting a break, but it never actually happens... so then you basically foreast a persistant pattern until it actually ends up breaking for real. Given the current pattern, I'll live and die by the sword and say there is no way this cuts and we get a soaking rain with temps in the 40's.

I am pretty much in agreement with you. If the 500mb ends up as depicted by current modeling, it would defy laws for this primary to cut. The difference maker in my opinion is however that the primary could still achieve enough northward advancement to allow enough WAA and rising hghts ahead of it that it becomes to warm for the secondary. If you look at the GFS it has this large strung out primary that has moisture stretching a great distance from S to N, simply because it doesn't know where to send the energy. It will more likely be one consolidated LP, and if it is able to slide S and E under the confluence then it brings in colder air as it hooks up with the LP in the SE US. Problem right now is they remain two seperate distinct LPs.

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