Present a climatological and composite analysis of mcss that encountered Lake Michigan Present a climatological and composite analysis of mcss that encountered Lake Michigan


НазваPresent a climatological and composite analysis of mcss that encountered Lake Michigan Present a climatological and composite analysis of mcss that encountered Lake Michigan
Дата конвертації29.03.2013
Розмір524 b.
ТипПрезентации









Present a climatological and composite analysis of MCSs that encountered Lake Michigan

  • Present a climatological and composite analysis of MCSs that encountered Lake Michigan

  • Describe two MCSs, one that persisted and one that dissipated while crossing Lake Michigan, and place them into the context of the composites

  • Discuss two simulations of the persisting MCS to identify the effects of Lake Michigan



MCSs in this study:

  • MCSs in this study:

    • are from the warm seasons (Apr–Sep) of 2002–2007
    • are ≥[100  50 km] on NOWrad composite reflectivity imagery
    • contain a continuous region ≥100 km of 45 dBZ echoes
    • meet the above criteria for >3 h prior to crossing Lake Michigan
  • 47 out of 110 (43%) MCSs persisted upon crossing Lake Michigan









Constructed using 0000, 0600, 1200, 1800 UTC 1.0° GFS analyses

  • Constructed using 0000, 0600, 1200, 1800 UTC 1.0° GFS analyses

  • Time chosen closest to intersection with Lake Michigan

    • If directly between two analysis times, earlier time chosen
  • Composited on MCS centroid and moved to the average position



































  • WRF–ARW v.3.2, initialized at 1200 UTC

  • NARR initialization and boundary conditions

  • 4-km domain with explicit convection

  • MYJ PBL and WSM6 microphysics schemes















  • MCS that dissipated progressed into a less favorable synoptic-scale environment and was associated with a weaker near-surface inversion than MCS that persisted



  • MCS that dissipated progressed into a less favorable synoptic-scale environment and was associated with a weaker near-surface inversion than MCS that persisted

  • WRF simulations suggest that MCS persistence was primarily a function of the large-scale environment, with Lake Michigan modulating MCS strength within favorable large-scale envelope.



  • 200-hPa jet

  • 850-hPa LLJ

  • Downstream CAPE

  • Over-lake inversion













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