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February 2024 mid/ long range


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5 minutes ago, Carvers Gap said:

It rarely fails us....thunder in the mountains.  Just a wild rule that is probably more accurate than most weather models.  Congratulations to everyone seeing snow. Pics or it didn't happen!  LOL.

Yeah, pretty good boomers with that line that moved through around 9:30 here. Wind damage as well with Trees downed. 

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7 hours ago, jaxjagman said:

That was a nice little storm,some intense snow with flakes over a half dollar and thundersnow,to bad it's already about to end 

Yeah, it was fun while it lasted. Wish I could have heard that thundersnow given it occurred on the west side of town. 

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GTH Outlook Discussion
Last Updated - 02/13/24
Valid - 02/21/24 - 03/05/24
Since earlier this month, RMM observations show a westward retreat of the MJO signal over the western Pacific, followed by the resumption of a more canonical eastward propagation where it has recently entered the Western Hemisphere (phase 8). The observed behavior appears to be tied to a fairly strong Rossby wave activity in the global tropics which led to a breakdown of the wave-1 spatial pattern in the upper-level velocity potential anomaly fields during the past week. Looking ahead, RMM forecasts have been consistent in favoring a weakened and incoherent MJO through late February, as models remain nearly unanimous with the signal falling within the unit circle in the next two weeks. However, analysis of several MJO variable forecasts reveal a more coherent MJO perspective, and the thinking is that the disorganizing MJO favored in the RMM forecasts may be more of an undesired effect of RMM methodology. A comparison of RMM indices with and without the 120-day running mean shows a sharp left-to-right shift of values in phase space, where the positive Indian Ocean Dipole (+IOD) event that peaked this past fall appears to be exerting a dominating influence in the mean. Because this low frequency response is no longer evident in the tropical circulation (namely, in the absence of enhanced lower-level easterlies over the Indian Ocean), the RMM forecasts may be overcorrecting themselves to the right along the RMM 1 axis, where the eastward propagating signals favored in the Western Hemisphere (phases 8 and 1) are actually higher in amplitude than what is being depicted.

As a result, this would suggest stronger MJO activity in the outlook, which is supported by upper-level velocity potential anomaly forecasts favoring more of a wave-1 pattern during the next several weeks. Though, it should be noted that even with this RMM biasing, there remains some uncertainty with the evolution of the MJO given a tendency in the model solutions for faster propagation speeds. This is still contributing to high ensemble spread, placing the enhanced envelope at different phases at the longer leads, which is also featured in the upper-level velocity potential forecasts between the ECMWF and GEFS. Regardless of these differences with timing, the large-scale environment is expected to be favorable for tropical cyclogenesis over the southern Indian Ocean, with increasingly less favorable conditions for additional Tropical Cyclone (TC) formation over the South Pacific heading into early March.
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The end of the month right now looks more severe than winter.Big ridge is going to sit on top of Japan and head east,it seems possible like the GFS has been showing this is going to be a fairly strong ridge to our NE which in return we would see the heights rise,JMHO

GFS-Model-–-500mb-Height-Anomaly-for-Western-Pacific-Tropical-Tidbits (4).png

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The MJO appears to be "potentially" getting ready to take the tour of the cold phases.  If it does, this is a monumental bust of the CPC MJO plots which were trying to go back into the warm phases without going into cold phases.  This has occurred all winter - CPC plots trying to skip either the cold or warm phases.  I am not sure if the CPC plots are just representative of modeling bias...IDK.   I think that is why we are seeing operational modeling find cold fronts that were not present 3-4 days ago.   

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The 12z Euro has now found the 24-25th cold front.  It also has the rain/snow line over TRI for Friday night into Saturday.  Would not be surprised to see WWAs posted with that.  The GFS has the same trend, but was mainly over SW VA.  Operationals have definitely trended colder yet again.  No idea if that holds.  This is VERY similar to what happened in early January.

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  • Mr Bob unpinned this topic

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