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Thursday's storm ...Rain, snow, ice, wind (part 2)


OKpowdah

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I'm not impressed with Friday yet. I think that belongs to upstate NY toward YUL. Maybe there's some GS/PL or FZRA/RA or even a rumbler.

Yeah I'm not too excited either.

I think it looks a bit too warm for many of us. The best will be in higher elevations in the Greens where QG forcing and oragraphic lift coincides.

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Big differences between the 18Z runs of the NAM and GFS with regard to precipitation type here in the Berks. NAM has me over to a rain, sleet mix by 9Z, GFS still has me ripping snow at 12Z with an isothermal atmosphere below 800 mb. If GFS is right we may get several inches of snow before changeover. On the other hand, if NAM is right, I'll be lucky to get 5 weenie flakes. I'm favoring a blend of the two models, but putting more weight on the warmer NAM solution. I actually hope I'm wrong though.

post-48-0-10752000-1326321149.png

post-48-0-84350200-1326321156.png

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I'm starting to wonder if the models might be blowing it on a potential near warning ice storm scenario amid these Advisory cut outs.

1) Regional temps are sliding back toward 0C, while DPs range from 21-29F across all sites and unofficial 'tweeners. Wet bulb temperatures are probably closer to 29 than 33F this time, due to the fact that pressures are unbalanced on the high side N of the region (due to pp anomaly associated with polar high). This sort of scenario is always under anticipated.

2) The lowest grid is likely not accurately handled regardless of model type when we input saturation into that - ageostrophic flow is likely too weak amid the guidance types once this air mass saturates. Even if not very observed, with higher pp N, it is going to be very difficult to erode out the llv cold. The way that works is, cold dense saturated, homogenous lower boundary layer air mass will flow from meso high toward meso low in the lowest 50 mb of the atmosphere, and this will set up below the inversion at ~ 100mb up. Above that, baroclinic events transpire as though the column on the bottom were not there.

If there were not high up there I'd say we get 32-33F along Rt 2 with temps apprroaching 50S of the Pike by mid way through the event. But given to the observation that BL resistence is stacked heading N and set up nearly ideally for ageostrophic drain, I am wondering if we 're missing the boat on this.

Hard to think outside the box sometimes with all these pretty model graphics to digest every 3 to 6 hours.

If you were in the hot seat, would you forecast warning criteria ice? You seem to allude sometimes that you are the only one that thinks outside the box but what would you actually forecast as opposed to pure speculation?

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If you were in the hot seat, would you forecast warning criteria ice? You seem to allude sometimes that you are the only one that thinks outside the box but what would you actually forecast as opposed to pure speculation?

I don't see how anything I wrote "alludes" to my being the "only one" who thinks outside the box.

It's like you just inserted that -

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I don't see how anything I wrote "alludes" to my being the "only one" who thinks outside the box.

It's like you just inserted that -

Sorry misinterpreted that. Thought you were saying we couldn't think outside the box with the constant 3-6 hour model data. I just agree with Capecodwx that it has been discussed over the past 18 pages.

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