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Jan 11-12 Model/Forecasting Discussion


Ji

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Oops I worded that bad. The mass qpf and diabatic heat release through the atmosphere weakens that southern migratory wave so the GFS can capture it and phase the low/mid level circulation before tracking up the coast. That is what you want, but that will depend on the cutoff taking that really far S track. If that southern PV is too fast and not captured, this storm is OTS like 18Z. If it is too weak and dumps too much qpf, there is nothing to phase and this prolly heads OTS. This is going to be interesting to see how the models handle this event the next few days. I bet it won't be very good though.

so there's no middle ground in your eyes? ots or phased storm? i guess the pattern argues for that.. i still believe in the nw trend to some degree i guess which is what i would think watching previous runs to this.

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i've said it seemed like a 2-4/3-6 inch storm.. if things kept as they were that's where i'd go if it wasnt still at this range (but it's getting closer obviously). if the other globals follow up it could be real.. with the performance of late i dont expect this to lock in from here and look this good/better through the end like we saw in 09-10

I am 35 and have lived in Baltimore my whole life and i highly doubt that we will ever see another 09-10 for the rest of my life here. That said i would gladly take 3-6 with the screwzone we have been in this winter so far.

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so there's no middle ground in your eyes? ots or phased storm? i guess the pattern argues for that.. i still believe in the nw trend to some degree i guess which is what i would think watching previous runs to this.

There is little wiggle room mainly because of that southern wave. If you look at a fast solution...the southern wave negatively influences advection patterns and the upper level height field can't respond with upstream ridging ahead of the trough. It has to phase. I guess a slower solution with that southern wave would work too though if the trough could phase the southern wave before it craps out. If it is too slow it will sit there and dump qpf and rot away.

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No wait for the the real polar vortex to drop into Canada and pull everything north.

gfs_500_240s.gif

My point was missed, all i'm trying to say is that you cannot throw a run out based on climatology of strong la ninas. We are not in a typical pattern of a strong la nina.

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There is little wiggle room mainly because of that southern wave. If you look at a fast solution...the southern wave negatively influences advection patterns and the upper level height field can't respond with upstream ridging ahead of the trough. It has to phase. I guess a slower solution with that southern wave would work too though if the trough could phase the southern wave before it craps out. If it is too slow it will sit there and dump qpf and rot away.

So it is not a thread the needle scenario but it is close?. Oh well i guess i could always look at pictures of my 90 + inches from last winter.

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There is little wiggle room mainly because of that southern wave. If you look at a fast solution...the southern wave negatively influences advection patterns and the upper level height field can't respond with upstream ridging ahead of the trough. It has to phase. I guess a slower solution with that southern wave would work too though if the trough could phase the southern wave before it craps out. If it is too slow it will sit there and dump qpf and rot away.

ok thanks.. maybe i need to scale back from 2-4 to 0 :scooter:

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Oops I worded that bad. The mass qpf and diabatic heat release through the atmosphere weakens that southern migratory wave and slows it down so the GFS can capture it and phase the low/mid level circulation before tracking up the coast. That is what you want, but that will depend on the cutoff taking that really far S track. If that southern PV is too fast and not captured, this storm is OTS like 18Z. If it is too weak and dumps too much qpf, there is nothing to phase and this prolly heads OTS. This is going to be interesting to see how the models handle this event the next few days. I bet it won't be very good though.

That southern SW is essentially just creates a surface front and pulls up warm humid air. The southern upper energy usually shears out Northeast of the surface low during a phase like it does on this run.

Scroll 90-114

http://www.meteo.psu...avnloopnew.html

.

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