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Feb 1/2 Obs


nj2va

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The cluster in WVA is a little caution flag but obviously the overwhelming majority hit us good. Looks like MD is ground zero for both mean precip and mean snowfall.

I meant MD/NOVA is ground zero.

Are their any big ones Bob? I can't shake the notion that this might end up as a pretty big storm.

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Ian do you have a list of the top analogs to this pattern? I believe I saw you make mention of them earlier.

Euro ensemble not out yet but these are 12z/500mb NH

 

Euro

 

6jLOo7Z.jpg

 

GFS

 

4pmZ15W.jpg

 

GFS ENS

 

pvO6hu0.jpg

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Are their any big ones Bob? I can't shake the notion that this might end up as a pretty big storm.

There's 12" ones in there. Can't really tell what the biggest is. Half have 6" or more fore many of us. Mean is 5-6" which is pretty good considering mean precip is .50-.60. Guess not many rainers in there.

You'll be glad to know there's like only 1-2 unacceptable south solutions.

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Euro ensemble not out yet but these are 12z/500mb NH

Euro

6jLOo7Z.jpg

GFS

4pmZ15W.jpg

GFS ENS

pvO6hu0.jpg

Thanks. I saw that list and took a deep breath when I saw the year at the top. I was wrong, but I thought pd 2 might make the list. At least at 5h across the U.S. it's similar, but I don't have maps that show more of the NA continent and the Atlantic. I'm sure they exist, but I won't look for them.

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There's 12" ones in there. Can't really tell what the biggest is. Half have 6" or more fore many of us. Mean is 5-6" which is pretty good considering mean precip is .50-.60. Guess not many rainers in there.

You'll be glad to know there's like only 1-2 unacceptable south solutions.

Thanks Bob

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Unlike the last storm, where we had major models split on the impact, sure seems like we have pretty good agreement for this storm. Heck, even saw that the NAV-G is on board.

 

Yeah. We have to feel pretty good about where the models are right now. But they can always agree later on a worse result for our area. I think its a givin we see some snow at this point. But how much is way up in the air.

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I doubt it, because the weatherbell maps (which we all know are 10:1) show our area getting about 9", while the Eurowx maps give us 11.5.

 

It would make sense if Eurowx accounted for ratios.

 

Thanks, that makes sense.

 

Re: the EuroWx map snow ratios... DT posted something saying that those maps use the 'Evan Kuchera algorithm'. Can someone explain how that differs from, say, WxBell ratios? Thanks in advance.

 

I believe EuroWX uses a 10:1 ratio.  So if the model says you'd get the equivalent of 1" of rain, it will convert that to 10" of snow.  I don't know what the Evan Kuchera algorithm is, but it probably takes into account factors like the ones HM discusses above.  InstantWeatherMaps.com uses that algorithm as well.  (http://www.instantweathermaps.com/faq.php)

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