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Jan 11-12 Model/Forecasting Discussion


Ji

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snapback.pngchris87, on 08 January 2011 - 01:16 PM, said:

If people only knew some of the assumptions that are made in cloud microphysics schemes used in models, you would understand why QPF forecasts aren't very good.

Not to fault researchers (believe me)...it just is a really hard process to parameterize and too computationally expensive to do explicitly.

This! I'm constantly amazed the models score/verify as well as they do.

Hey, both, check your PM's on Monday. I'll send you the draft exoscale computing roadmap that looks to mitigate the computational challenges chris87 references. It's for the eventual replacement for stratus and cirrus (so a ways off) and looks to solve the challenges on the h/w and s/w side.

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what airport code are you using for westmister? I use municipal apt dmw and it gives me .46

that's the station code I used, but I sometimes didn't include the .01 or .02 that were clearly flurries after the storm was over if it seemed apparent based on RH of 850 and 700mb, that's all

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its funny...mildews play by play made it sound like we were going to get screwed and the qpf held or got better in some areas(DCA)

we're still 3-4 days out.. what are the odds any of these qpf numbers will be within .1?

more important is the track the euro keeps spitting out is almost exactly the same run to run. though im still nervous with where it blows up... that could easily be an issue here with getting the highest qpf overhead.

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i dont think that's fully accurate even if some stations have more. it's pretty much the same but the qpf shield is slightly east here on the whole, slightly west down south in va though. run to run it's basically the same output.looking at hundredths of qpf is useless imo.

In general the guidance seems to support a 2-4 or 3-5 inch 1st guess. I suspect that the gfs will trend towards the euro but this year, the models have tended to flop around even at this time range.

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Looks like Euro has the front type system coming through around Day 8 based on Day 7 maps off Plymouth

Day 7 is cold enough, but don't know about Day 8

http://vortex.plymouth.edu/cgi-bin/gen_grbcalc2.cgi?re=us&id=&zoom=.6&ti=0≥=1024x768&mo=ecmwf≤=850&va=temp&in=5&pl=cf&ft=7day&cu=latest&overlay=no&mo=≤=&va=&in=&pl=ln&ft=h24&cu=latest

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