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    Climatic Role of North American Low-Level Jets on U.S. Regional Tornado Activity

    Source: Journal of Climate:;2012:;volume( 025 ):;issue: 019::page 6666
    Author:
    Weaver, Scott J.
    ,
    Baxter, Stephen
    ,
    Kumar, Arun
    DOI: 10.1175/JCLI-D-11-00568.1
    Publisher: American Meteorological Society
    Abstract: ariability of springtime tornadic activity over the United States is assessed through the connectivity of preferred modes of North American low-level jet (NALLJ) variability to the local thermodynamic environment and remote SST variations. The link between regional tornado activity and NALLJ variability as diagnosed from a consistent reanalysis system (i.e., NCEP?NCAR) serves as dynamical corroboration in light of the inhomogeneous tornado database. The analysis reveals a multidecadal variation in the strength of the NALLJ?tornado connection, highlighted by tornado activity in the southern Great Plains region nearly doubling its correlation with NALLJ principal component 1 (PC 1) in recent decades. Locally, this is a result of a southward shift of NALLJ variability modes during the recent period. Motivated by these epochal shifts in NALLJ activity, a comparison of the early (1950?78) and late (1979?2010) tornado and NALLJ SST linkages indicates an Atlantic decadal SST variability influence during the early epoch, with Pacific decadal variability thereafter, highlighting the remote SST influence on the shifts in geographic placement and strength of NALLJ variability. The remote SST variability linkages further reveal that the observed global-scale SST trend pattern over the last 61 years may be contributing to a shift toward weaker tornadoes during spring in the northern Great Plains region. Tornado activity over the southeast region of the United States shows no such relationship to the SST trend pattern during spring, an immunity that is unexpected if spurious trends in the tornado database were influencing the SST linkage.
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      Climatic Role of North American Low-Level Jets on U.S. Regional Tornado Activity

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4221969
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    contributor authorWeaver, Scott J.
    contributor authorBaxter, Stephen
    contributor authorKumar, Arun
    date accessioned2017-06-09T17:05:25Z
    date available2017-06-09T17:05:25Z
    date copyright2012/10/01
    date issued2012
    identifier issn0894-8755
    identifier otherams-79213.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221969
    description abstractariability of springtime tornadic activity over the United States is assessed through the connectivity of preferred modes of North American low-level jet (NALLJ) variability to the local thermodynamic environment and remote SST variations. The link between regional tornado activity and NALLJ variability as diagnosed from a consistent reanalysis system (i.e., NCEP?NCAR) serves as dynamical corroboration in light of the inhomogeneous tornado database. The analysis reveals a multidecadal variation in the strength of the NALLJ?tornado connection, highlighted by tornado activity in the southern Great Plains region nearly doubling its correlation with NALLJ principal component 1 (PC 1) in recent decades. Locally, this is a result of a southward shift of NALLJ variability modes during the recent period. Motivated by these epochal shifts in NALLJ activity, a comparison of the early (1950?78) and late (1979?2010) tornado and NALLJ SST linkages indicates an Atlantic decadal SST variability influence during the early epoch, with Pacific decadal variability thereafter, highlighting the remote SST influence on the shifts in geographic placement and strength of NALLJ variability. The remote SST variability linkages further reveal that the observed global-scale SST trend pattern over the last 61 years may be contributing to a shift toward weaker tornadoes during spring in the northern Great Plains region. Tornado activity over the southeast region of the United States shows no such relationship to the SST trend pattern during spring, an immunity that is unexpected if spurious trends in the tornado database were influencing the SST linkage.
    publisherAmerican Meteorological Society
    titleClimatic Role of North American Low-Level Jets on U.S. Regional Tornado Activity
    typeJournal Paper
    journal volume25
    journal issue19
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-11-00568.1
    journal fristpage6666
    journal lastpage6683
    treeJournal of Climate:;2012:;volume( 025 ):;issue: 019
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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