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    Multiscale Upstream and In Situ Precursors to the Elevated Mixed Layer and High-Impact Weather over the Midwest United States

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    Author
    Cordeira, Jason M.
    Metz, Nicholas D.
    Howarth, Macy E.
    Galarneau, Thomas J.
    Affiliation
    Univ Arizona, Dept Hydrol & Atmospher Sci
    Issue Date
    2017-06
    
    Metadata
    Show full item record
    Publisher
    AMER METEOROLOGICAL SOC
    Citation
    Multiscale Upstream and In Situ Precursors to the Elevated Mixed Layer and High-Impact Weather over the Midwest United States 2017, 32 (3):905 Weather and Forecasting
    Journal
    Weather and Forecasting
    Rights
    © 2017 American Meteorological Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Two severe MCSs over the upper Midwest United States resulted in >100mm of rain in a similar to 24-h period and. 200 severe weather reports, respectively, during 30 June-2 July 2011. This period also featured 100 (104) daily maximum high (low) temperature records across the same region. These high-impact weather events occurred in the presence of an elevated mixed layer (EML) that influenced the development of the severe MCSs and the numerous record high temperatures. The antecedent large-scale flow evolution was influenced by early season Tropical Cyclone Meari over the western North Pacific. The recurvature and subsequent interaction of Meari with the extratropical large-scale flow occurred in conjunction with Rossby wave train amplification over the North Pacific and dispersion across North America during 22 June-2 July 2011. The Rossby wave train dispersion contributed to trough (ridge) development over western (central) North America and the development of an EML and the two MCSs over the upper Midwest United States. A composite analysis of 99 warm-season days with an EML at Minneapolis, Minnesota, suggests that Rossby wave train amplification and dispersion across the North Pacific may frequently occur in the 7 days leading up to EMLs across the upper Midwest. The composite analysis also demonstrates an increased frequency of severe weather and elevated temperatures relative to climatology on days with an EML. These results suggest that EMLs over the upper Midwest may often be preceded by Rossby wave train amplification over the North Pacific and be followed by a period of severe weather and elevated temperatures.
    Note
    6 month embargo; Published Online: 12 April 2017
    ISSN
    0882-8156
    1520-0434
    DOI
    10.1175/WAF-D-16-0122.1
    Version
    Final published version
    Sponsors
    College of Arts and Sciences at Plymouth State University; Center for the Environment at Plymouth State University; Hobart and William Smith Colleges Provost's Office; National Science Foundation [ATM-0304254, ATM-0553017, ATM-0646907]
    Additional Links
    http://journals.ametsoc.org/doi/10.1175/WAF-D-16-0122.1
    ae974a485f413a2113503eed53cd6c53
    10.1175/WAF-D-16-0122.1
    Scopus Count
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    UA Faculty Publications

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