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The March 6 Storm- The (last) Great White Hope


stormtracker

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eh....no....nobody from DC north is going to be too happy with this run...on to tomorrow

How bleak are the numbers this run?

This is definitely more of a concern than it coming too north for you, I think. This is a pretty ridiculous blocking setup...nothing like 2009-2011 of course....but still ridiculous. Usually these events don't come at the point when the block is coming west and then south. They come once that period is over and it is lifting out as the coastal low takes over as the new "low anomaly" on the height charts.

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How bleak are the numbers this run?

This is definitely more of a concern than it coming too north for you, I think. This is a pretty ridiculous blocking setup...nothing like 2009-2011 of course....but still ridiculous. Usually these events don't come at the point when the block is coming west and then south. They come once that period is over and it is lifting out as the coastal low takes over as the new "low anomaly" on the height charts.

 

it is just a sharp cutoff...I;d say most of DC metro is 0.6 to 0.8

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it is just a sharp cutoff...I;d say most of DC metro is 0.6 to 0.8

.6 qpf on the low end total would be a great multiplier for the current season snowfall and would still slash that 2 inch drought.

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it is just a sharp cutoff...I;d say most of DC metro is 0.6 to 0.8

Okay, thanks. I wonder if the occluding/redeveloping process with this thing is going to cause big headaches with the cutoff/edge of the spiraling comma. The exact timing of when it occludes and when it reforms, possibly more than once, is going to have a big impact on the way the precip is distributed.

The beautiful thing about the VA-MD corridor is its ability to squeeze out more moisture because of orographic processes. If isentropic lift / moisture advection etc. gets disrupted due to some crappy timing with occluding/reforming, that could kind of take the strength of the bands down as they are coming through. I have no idea...just speculating.

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Ill admit the euro just took the wind out of my sails a bit. I was not expecting it to go south but I will wait for ensembles to see if it was a blip or a huge red flag. Hearing it got suppressed mainly south of dc worries me because I think the northern edge of sig snow is either going to make it close to Philly or it gets suppressed south of dc. That's usually how these go.

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I can see between now and tuesday people saying "the north trend can stop now." We are in a good spot wrt being in the northern qpf max.

thing is, we're still at 72hrs+ so this ain't set in stone any any stretch

I guess that means it could go even further south but I don't think so

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How bleak are the numbers this run?

This is definitely more of a concern than it coming too north for you, I think. This is a pretty ridiculous blocking setup...nothing like 2009-2011 of course....but still ridiculous. Usually these events don't come at the point when the block is coming west and then south. They come once that period is over and it is lifting out as the coastal low takes over as the new "low anomaly" on the height charts.

 

 

Yeah, I really don't see this one coming north. The block is really oriented very much to the west. Several days ago, the suppressed solutions had the block oriented in this fashion where it was "pointing" towards the Midwest, meaning the downstream confluence and ULL features were very close to the coast, and thus a suppressive pattern. 

 

The runs that came north made a drastic shift with the orientation of the block, as it was oriented a lot more eastward. It was then "pointing" towards the Atlantic, and actually bridging with the height rises out ahead of our bowling ball, leading to large height rises, and the storm climbing the coast. Additionally, this meant that the downstream confluence was also further east.

 

Now, we are back to the original solutions with respect to the blocking: oriented well to the west, not bridging with the SE ridge, and the ULL/confluence is very close to the coast. Thus, the consistently suppressed solutions. 

 

The models appear to be pretty locked in with respect to the orientation and strength of the block, and it's hard to imagine that they are all significantly wrong with the strength and orientation of such a large blocking feature within a relatively small lead time. 

 

I definitely do think there is room for this to trend to the very high precipitation amounts for the DC area. But I'd be shocked if DC were too far south. 

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Okay, thanks. I wonder if the occluding/redeveloping process with this thing is going to cause big headaches with the cutoff/edge of the spiraling comma. The exact timing of when it occludes and when it reforms, possibly more than once, is going to have a big impact on the way the precip is distributed.

The beautiful thing about the VA-MD corridor is its ability to squeeze out more moisture because of orographic processes. If isentropic lift / moisture advection etc. gets disrupted due to some crappy timing with occluding/reforming, that could kind of take the strength of the bands down as they are coming through. I have no idea...just speculating.

 

you wont hear me saying this often but I want the primary to hold on as long as possible...I'd really like the ULL to pull itself up by the bootstraps and wedge itself into SW VA....the GEFS was closest to doing this..it must have some amplified members...

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thing is, we're still at 72hrs+ so this ain't set in stone any any stretch

I guess that means it could go even further south but I don't think so

Im basing my assumption purely on experience. Blocks typically are not as entrenched as modeled 4-5 days out. That means everything wrt 100 mile shifts north. I hope im right.....bc i havent seen many be stronger and force systems south.

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Yeah, I really don't see this one coming north. The block is really oriented very much to the west. Several days ago, the suppressed solutions had the block oriented in this fashion where it was "pointing" towards the Midwest, meaning the downstream confluence and ULL features were very close to the coast, and thus a suppressive pattern. 

 

The runs that came north made a drastic shift with the orientation of the block, as it was oriented a lot more eastward. It was then "pointing" towards the Atlantic, and actually bridging with the height rises out ahead of our bowling ball, leading to large height rises, and the storm climbing the coast. Additionally, this meant that the downstream confluence was also further east.

 

Now, we are back to the original solutions with respect to the blocking: oriented well to the west, not bridging with the SE ridge, and the ULL/confluence is very close to the coast. Thus, the consistently suppressed solutions. 

 

The models appear to be pretty locked in with respect to the orientation and strength of the block, and it's hard to imagine that they are all significantly wrong with the strength and orientation of such a large blocking feature within a relatively small lead time. 

 

I definitely do think there is room for this to trend to the very high precipitation amounts for the DC area. But I'd be shocked if DC were too far south. 

Yep, exactly. There is just waaaay too much blocking for some massive northward shift. The ECMWF tonight is so strong that it actually shaves the NE edge of the precip shield. I agree that a gradual northward shift is possible, in a realistic fashion, that could put the DC-PHL corridor back into the significant precip shield. But I think with either solution, nothing is going to stop that beautiful VA upslope. That area, as usual, is primed in these setups.

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