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December 2017 Mid-Long Range Disco 2


WxUSAF

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  On 12/20/2017 at 7:47 PM, mitchnick said:

see, I guess that's my problem with the ensembles....an inch and a half is not a strong signal to me at all

 

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It’s actually 4”+ if you go through the 31st (total for the time period).  Considering its basically nothing through the 25th, that’s a good signal for next week.  

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  On 12/20/2017 at 7:47 PM, mitchnick said:

see, I guess that's my problem with the ensembles....an inch and a half is not a strong signal to me at all

 

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It's probably just that not all members show initial cold or don't show the cold air winning. Also why it shows 3-4" of snow in New England

5a3abec62c4e5_eps_tsnow_24m_ma_41(1).thumb.png.b9439736dc9062a9af537b5e80dc283f.png

Also, that's just 24 hours. It adds 3.5" to the snowfall mean for DC

eps_tsnow_m_washdc_34.thumb.png.7b7c53210d8ca9863fb4c0169bafd145.png

To

eps_tsnow_m_washdc_42.thumb.png.37983a6c3464c000726dca0a5551dd93.png

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  On 12/20/2017 at 7:52 PM, Amped said:

Look at the pattern, not the maps 8 days out.  Models will botch the snowfall somewhere 24hrs out we don't need day 7-10 maps.

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Agreed. One of the worst things to be put out for weather models are snow maps. I wish we could turn the clock back a few years to when they didn't exist. To make it even worse than it already is....the algorithms on some (wxbell in particular) are flawed and dumb. 

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Decent pattern, will need to be watched.  The highs are a little far north but not too bad.

The improvement over yesterday is less troffing in the southwest.    A flat flow is kind of like a seesaw and any troff that digs across the southwest can pump up the southeast ridge.  There's only so much of it the 50/50 low can stop.

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Another way to view the ensembles.  This is just for DC, but it gives you a sense of the spread in timing that's still on the table past the 25th.  It's a pattern with good potential, but also a lot of chances for rain.  Of course areas north and west would do better with snow.

71whdRs.png

mbwExjX.png

 

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