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2/19 East Coast Winter Storm Threat


OKpowdah

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May be a case of dumfounding pingers south of the Pike.

In all seriousness though the threat is there. Would like to see the GEFS start picking up on it... and some of the other globals.

yeah agree there.

both the 00z and 06z runs had a few members really amped up like that while all the rest were more like the majority of the op models.

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There are differences here that are important comparing the 00z to 12z run...

Namely, the interaction between the northern stream/SPV fragmentation and the southern stream, which houses the initial Miller A type low.

Last night's run had better SPV involvement and subsume scenario. There is some quasi tendency for that to happen on the 12z run but not as prodigiously.

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Cool what did you see?

s/w diving into the PacNW is more amplified (and digs more SW in the flow)

the PV lobe in Saskatchewan is more amplified to the west, and lags a little more (better timing for future phasing)

The vortex in formation in southern Canada is more perturbed and stretched toward two lobes, rather than rounded and symmetric ... allows ridging to build in the OV ahead of the collection of converging s/w's, helping to amplify the system

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GGEM is coming around to the idea to some extent. It's got more energy now coming into the dakotas in the top part of the trough...missing the s/w in the upper texas area so it's not going to pull this all together I don't think but IMO it's going that way to a lesser extent (much). As a result it comes apart at about 60-72 hours from the GFS.

Hard to go against the GGEM.

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s/w diving into the PacNW is more amplified (and digs more SW in the flow)

the PV lobe in Saskatchewan is more amplified to the west, and lags a little more (better timing for future phasing)

The vortex in formation in southern Canada is more perturbed and stretched toward two lobes, rather than rounded and symmetric ... allows ridging to build in the OV ahead of the collection of converging s/w's, helping to amplify the system

Nice, going to be interesting what the rest of the 12 Z suite does with all the moving parts, Geezus can DT get any worse, he and JB are god awful.

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Also, look upstream at the 500mb vorticity around hour 36 to Oregon. There is a small but important intermediate stream S/W tucked in there; that is what really initiates the N stream over Manatoba to really come down... That stream interaction gets the timing ball rolling so to speak, such that when the southern stream then kicks out of the SW the result was (for the first time this year) a constructive wave interference scheme nearing the OV.

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Also, look upstream at the 500mb vorticity around hour 36 to Oregon. There is a small but important intermediate stream S/W tucked in there; that is what really initiates the N stream over Manatoba to really come down... That stream interaction gets the timing ball rolling so to speak, such that when the southern stream then kicks out of the SW the result was (for the first time this year) a constructive wave interference scheme nearing the OV.

GGEM not buying those features. Without them the northern energy gets way ahead and it's flat as heck.

It's not terribly far off though..but the 12z GFS is going to be the extreme left solution.

GGEM is going to be terrible I think.

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As I said, subtle shifts make significant difference. We CAN tell what this is doing by 00z 2/17 (hr36)

The GFS isn't making any wild and crazy changes (as some like DT might imply). These are minor tweaks in the short term that have large ramifications in the longer term.

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As I said, subtle shifts make significant difference. We CAN tell what this is doing by 00z 2/17 (hr36)

The GFS isn't making any wild and crazy changes (as some like DT might imply). These are minor tweaks in the short term that have large ramifications in the longer term.

GGEM/GFS differ very early...well within their wheelhouses on specific features which propogate forward. Very bizzare

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As I said, subtle shifts make significant difference. We CAN tell what this is doing by 00z 2/17 (hr36)

The GFS isn't making any wild and crazy changes (as some like DT might imply). These are minor tweaks in the short term that have large ramifications in the longer term.

Yeah it's not like random shortwaves are showing up on the progs. You make small adjustments up in NW Canada and then have 4+ days to roll it forward and see what happens...of course you can have wild changes. An easy adjustment could make this go ENE of HSE too.

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