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jaxjagman

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    January Medium-Long Range Discussion

    in Tennessee Valley

    Posted

    GTH Outlook Discussion
    Last Updated - 01/16/24
    Valid - 01/24/24 - 02/06/24
    Following a period of weakening over the Indian Ocean earlier this month, the MJO became much more organized during the past week. Latest RMM observations show the MJO signal propagating eastward into the Maritime Continent (phase 4), and steadily gaining amplitude, which is well reflected by a reemerging wave-1 pattern in the 200-hPa velocity potential anomaly fields. A large uptick in MJO amplitude is heavily favored in the dynamical models during the next week, which appears to be tied to constructive interference with a convectively coupled Kelvin Wave propagating out of the Indian Ocean. This wave phasing is likely to promote widespread enhanced convection over the Maritime Continent, which has been otherwise persistently dominated by a suppressed convective El Nino response.

    Even with the MJO continuing to destructively interfere with the low frequency El Nino conditions, intraseasonal activity is largely favored to remain coherent during the next several weeks. Very good agreement exists in the RMM forecasts depicting a high amplitude event propagating eastward into the Western Pacific during the next two weeks, where the MJO looks to eventually constructively interfere again with base state over the Equatorial Pacific. Ensemble spread increases in the extended range, however many solutions (especially the GEFS) continue to maintain a high amplitude event, taking the MJO signal back into the Western Hemisphere by the first or second week of February. A healthy, eastward propagating MJO is expected to provide increasingly favorable conditions for Tropical Cyclone (TC) development over parts of the southern Indian Ocean, as well as the Western Pacific on both sides of the Equator. And in light of aforementioned convective pattern reversal favored over the Maritime Continent in the near term, this could induce a stronger MJO teleconnection in the extratropics downstream. Wintertime Indian Ocean and Maritime Continent MJO events typically lead to the development of anomalous mid-level ridging with warmer than normal temperatures over the central and eastern U.S. This is consistent with the latest week-2 guidance, however there is also both model and historical support for the associated anomalous mid-level ridging to retrograde over western North America with time, potentially allowing for the return of colder than normal temperatures over parts of the U.S. heading into February.

    Tropical-Monitoring-North-Carolina-Institute-for-Climate-Studies (10).png

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    January 15th-17th 2024 Arctic Blast/Snow Event

    in Tennessee Valley

    Posted

    1 hour ago, *Flash* said:

    So, I know the event is still ongoing...and I need to get caught up on about 15 pages of comments. In terms of modeling W's and L's, how are we breaking down performance? Certainly, NOT a win for the Euro at least for my area...

    Thought the NAM was the big winner in our parts,EURO was the big loser

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