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December 18-20 Talking Points - Part 2


am19psu

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If a met could chime in...is there time for this to improve for our area? It has come 300 miles further west in one run from both the euro and gfs.......

There is plenty of time. If there is a bit more ridging out in front on this run, the shortwave rides up a bit farther inland, PHL and NYC would get clobbered.

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What is it going to take or what do we need to see on the models to pull this thing in closer so that PHL sees some plowable?

Now that the systems are on land all the models will be better able to understand whats going to happen. There should be consensus by Oz.

Rossi

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It looks like the 2 pieces of vorticity in question, including the one that dives down the back side of our "southern stream shortwave" and energizes this thing at the last minute, initialized offshore stil.

I must say the biggest surprise in a long time was waking up and seeing the 00z euro bring the big storm back just offshore. I really couldn't believe my eyes after all the consecutive runs and every other model seemingly bowing down and shifting east towards it. As usual though, it just seems like a step/run ahead.

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Not for nothing here but if the Euro keeps coming west along with the GFS then I'd consider that a big win for the GFS overall. It would have consistently in the mid-range showed this exact scenario while the Euro was consistently OTS......only over the prior 24 hours did the GFS blip and back off and it was the Euro that came around to the original GFS ideas.

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One bit of optimism in this situation is that in recent experience when models lose a storm and then bring it back the trend often doesn't stop there, some may call this anecdotal which is fine but I doubt the trend stops here, I'd say NYC for sure and poss PHL can still get a SECS out of this. The models have been so inconsistent it is mind boggling, so in all honestly who the hell knows what'll eventually transpire.

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I said this earlier and I'll say it again but even if the evolution here looks like its Miller A that precip maps screams Miller B. I mean it just sucks for PHL but look at that huge dry slot further west for folks in DC.

We just need some more westward trending from here to really be in great shape.

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Exact opposite for us on what we saw 2/6 earlier in the year. In that storm our area was at the far north end of the precip but we ended up with 2 feet. I can only pray for that to happen again and have this all shift 100 miles further west to get us in the good stuff.

Only 100 miles off at 84 hour. Gives us a shot.

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Who cares what the models indicate verbatim right now, it's the trends that count, and at 78-84 hours, we're hardly done trending. As I said yesterday I wouldn't be surprised to see us back in the game for a significant to major snowfall. Rest of today's runs should be interesting. Clearly w/ the latest data models are sensing a stronger southern stream short wave and also pumping the heights more immediately ahead of it. As a result we see the negatively tilted trough and the GFS suggests we close off at H5 somewhere east of NJ. If this occurs a bit faster, like the close off it was demonstrating near the Delmarva a few days ago, anyone along the I-95 is back in the game for big snows.

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