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12/19-12/20 threat


CoastalWx

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Some fookin analysis instead of whining would be sweet.

We finally got the shortwave to travel north but big problems with its association to the PV!

Analysis wise, it is actually what everyone was complaining about earlier with the ECM and its S/W bias. In this case, the GFS also suggests that southern stream shortwave "disentegrates". In other words, there is almost no cold air aloft left with that upper level wave and all that is left is a kink in the upper level height field. Phasing doesn't matter and it can't incite low level cyclogenesis.

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Analysis wise, it is actually what everyone was complaining about earlier with the ECM and its S/W bias. In this case, the GFS also suggests that southern stream shortwave "disentegrates". In other words, there is almost no cold air aloft left with that upper level wave and all that is left is a kink in the upper level height field. Phasing doesn't matter and it can't incite low level cyclogenesis.

Nice post. Makes perfect sense. I still want to vomit and am an old man in tears because it won't snow but thanks.

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Nice post. Makes perfect sense. I still want to vomit and am an old man in tears because it won't snow but thanks.

It will snow here.

The 00z Ukie at 72h looks pretty good to me too and that model was way out to sea at 12z...so I'm hoping there was some sort of burp on the 00z GFS.

Ukie is one of the better models out there, imo more respectable then the current GFS? Would you agree? The GFS consistency recently has been laughable. EURO consistent obviously but if these other foreigners come around west tonight its hard to imagine the EURO won't... GEM should be interesting.

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Nice post. Makes perfect sense. I still want to vomit and am an old man in tears because it won't snow but thanks.

Here is a better comparison. Note the thermal difference aloft...at 500 hpa here. GFS 2 days ago compared to tonight.

Tonight:

post-999-0-95796700-1292474804.png

2 days ago at the same forecast hour:

post-999-0-60741500-1292474796.png

The difference seems small, but in this case the upper level cold front has vanished and the wave is essentially no longer a baroclinic wave.

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The northern stream isn't doing us any favors either at 00z...I'll say that much. We've had some stronger tendencies with the PV.

Now that the models are keying in on a totally non-baroclinic southern stream wave, I would be surprised if any models show development, including the UK or ECM unless something else incites southern cyclogenesis. The Pacific NW wave the models had last night doesn't seem strong enough without the southern stream anomaly.

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