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The January 5/6 Thing


stormtracker
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3 minutes ago, Weather Will said:

WB 21Z NBM, I know it is a blend of other previous runs....

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Just in case anyone was wondering, the purpose for the NBM. As we know, most model suites have their ensembles at lower resolution. NBM was conceived to take operational models for the most part and use them as an ensemble suite. It makes sense since the operationals have the highest resolution. This was told to me on Phillywx by Rainshadow, who retired from NWS Philly a few years ago.

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Just in case anyone was wondering, the purpose for the NBM. As we know, most model suites have their ensembles at lower resolution. NBM was conceived to take operational models for the most part and use them as an ensemble suite. It makes sense since the operationals have the highest resolution. This was told to me on Phillywx by Rainshadow, who retired from NWS Philly a few years ago.

I know many tend to hug the snowiest for their backyard, but a blend of all of the major OPs makes total sense for actual forecasting purposes. If GFS / NAM also go south tonight and euro holds serve, that’s when I’ll be a smidge worried for Baltimore & north. And by “worried” I mean 4-6” instead of 8-12”
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6 minutes ago, psuhoffman said:

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Isn’t it usually said the euro doesn’t usually make big jumps just small gradual ones? but if it keep doing that for the next 4 runs dc would be in the heaviest and we’d be right in the north edge of the bigs. 

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15 minutes ago, mitchnick said:

Just in case anyone was wondering, the purpose for the NBM. As we know, most model suites have their ensembles at lower resolution. NBM was conceived to take operational models for the most part and use them as an ensemble suite. It makes sense since the operationals have the highest resolution. This was told to me on Phillywx by Rainshadow, who retired from NWS Philly a few years ago.

The NBM is a very useful tool for forecasting when you know how to interpret it and understand its biases. I've been keeping an eye on it and it's been pretty great with handling the swings and limiting the crazy max/min variance from run to run the past few days. It'll be interesting once the CAMs start getting incorporated. That will be a useful way to seeing some of the proposed banding being forecast. 

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3 minutes ago, osfan24 said:

Trash. Like the NAM on steroids. Not sure it’s ever been right. Always has insanely high qpf.

Here's :beer:to an 80 mile shift north over the next couple of days to be in the jackpot or for the storm to stay where its at, whichever comes first!  Enjoy this one you southerners in the Mid Atlantic!  Hopefully, we can squeeze out a couple of inches and be happy here in PA!

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