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Jan 31st - 33rd Storm Obs and Disco like it's 1979


Bob Chill
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Seeing a few mets saying NWS and others are getting too jumpy with their changes in forecasts. Miller b’s do come with one thing - the element of surprise. There’s 0 way to know or model where this CCB sets up or how quickly the coastal gets going. We’re going to have to be patient. Still Have a good feeling about the area from I-70 north and north east come tomorrow. 

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4 minutes ago, ErinInTheSky said:

I find it hilarious that models are STILL, like 18 hours away, whiffing on how much snow we will get.

Are Miller Bs that bad for us and they mess with models that hard?

Miller Bs are just complicated. Climatologically, they’re not the MOST successful for DC, but that’s neither here nor there. IMO Miller Bs have too many points of variance to be modeled as accurately as something like a clipper or a Miller A. (Although those do bust sometimes) 

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1 hour ago, Bob Chill said:

I'm def busting your chops but only because it's going down the bad way. I read a fraction of the analysis posts last week but on Tues I was surprised how different you and I were thinkng when I tuned in to lurk. I kept looking at the setup and thinking congrats pa/nj/nyc and consoling my yard's feelings. I remember looking at a euro run (dont remember what day) and there was literally no snow in the areas I figured the jackpot was headed for. It intrigued me very much but at the same time I was still pretty sure that the crush zone would gravitate to where it always does. 

Your analysis is always sound and solid like 100% of the time. I just didnt believe for a second that NMD/PA/NJ were going to get fringed. Opposing forces always seem to let up in the short range. I was really hoping we'd get to the short range with CPA still north of the super heavies that pump eastward off the ocean NW of the low center. The second the drift towards that idea started I dropped the idea of 12+ for my yard and set the win bar at 6" (ignoring my mental hard drove of memories). 6" is a solid # for any nina hybrid in DC metro. Especially when the multi year struggle is real. It just another example of how climo is often more powerful than NWP supercomputers

It’s funny you say this, I actually felt very similar 4-5 days ago. You articulate one of my concerns very well — which was the typical Jackpot spots were underperforming and that the variance between model runs wasn’t waffling in a way that screamed dc-nova-md banding. I personally thought the manner in which the transfer happens and the low positioned itself seemed to lend itself to later (hence more NW) development and the ccb would be to our NW/NE. 

However, it’s touch and go around these parts now. If you naysay snow too much around here you get axed. Is what it is. But I like the ridge building my out west through the period and recycling of some of our blocking to the north. Our cold source is much better than 4-6 weeks ago. I say we definitely see some good model runs coming in the intermediate, perhaps

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2 minutes ago, frd said:

North Central NJ on that image from the ICON is a snow magnet when it comes to Miller Bs.  Wasn't that a hot spot for Boxing Day too ?  

I grew up right over the border in Rockland county NY. 10 mins north of Bergen County NJ. NNJ into the lower Hudson valley into SW CT and coastal RI / MA always jack on these storms. Always. Someone in the higher elevations of NWNJ will see 30” I bet 

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6 minutes ago, frd said:

North Central NJ on that image from the ICON is a snow magnet when it comes to Miller Bs.  Wasn't that a hot spot for Boxing Day too ?  

I’m not up on my history since I haven’t been tracking snow for that long, but I do know where to find the answer! It appears you are correct.

64C1824D-1940-455C-8481-0C7C0B8D2BFB.png

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6 minutes ago, frd said:

North Central NJ on that image from the ICON is a snow magnet when it comes to Miller Bs.  Wasn't that a hot spot for Boxing Day too ?  

Remember December 30, 2000? DC was supposed to get 4 - 8 inches from that storm. We got CLEAR SKIES, while Northwestern NJ got bombed with 25 inches.

 

Here in Vienna, VA, the moderate snow stopped around 9 a.m., and it's been nothing but light or very light snow since.

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Mount Holly, some cool wording. They always do an exceptional job in the AFD.

 

In response to the the deepening surface low and increasing cold air
advection, the wintry mix along I-95 will quickly change back over
to snow Monday morning, and the rain/snow line will push back toward
the coast throughout the day. The strongest winds and heaviest snow
rates are not forecast to align (strongest winds likely occurring in
rain and mixing), therefore precluding the need for a Blizzard
Warning. A change over to all snow is expected on the back side of
the storm, even all the way to the coast, as the system begins
departing into Monday night.

The exact placement and strength of the low will dictate exactly
where the heaviest snow falls. The complexity of this system lies in
details of the system transitioning from an overruning precip regime
to a mesoscale banding (frontogenetic forcing) and wrap-around
precip regime early Monday. The latest 12Z guidance suite has
continued trending the f-gen banding potential a bit northward,
which suggests the greatest potential for this to occur across
portions of northern New Jersey (north of I-195) and eastern
Pennsylvania (Lehigh Valley and east/north). West of the f-gen
forcing, some guidance suggests that a dry-slot will advect in
around daybreak west of the Philly metro. The storm total snowfall
forecast was updated to reflect these features and the mixing
farther south/west. Generally 6-12" is forecast for around the
Philly metro with less south/east and more to the north. The axis of
f-gen can certainly change over the coming forecast updates. Snow
totals in the banding may exceed the broadbrush ~18-24" storm total
snowfall locally that is currently forecast in these areas.
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Just now, kgottwald said:

Remember December 30, 2000? DC was supposed to get 4 - 8 inches from that storm. We got CLEAR SKIES, while Northwestern NJ got bombed with 25 inches.

 

Here in Vienna, VA, the moderate snow stopped around 9 a.m., and it's been nothing but light or very light snow since.

Very much so, The snow area missed  me by miles. A crazy gradient from West to East.  To say the least I was bummed. 

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Just now, Crazy4Wx said:

Game time off the coast of NC...let’s see what she does.

Yup. Lots of thunderstorms off the coastline. Last frame of the radar loop you can begin to see a little filling in NoVa and bridging of the two main areas of low pressure. It’s going to be wicked close. 

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