Orographic influences in a Great Salt Lake-effect snowstorm


НазваOrographic influences in a Great Salt Lake-effect snowstorm
Дата конвертації29.03.2013
Розмір445 b.
ТипПрезентации


Orographic influences in a Great Salt Lake-effect snowstorm

Trevor Alcott, Jim Steenburgh

19th U.S./Canada Great Lakes Operational Meteorology Workshop

Ithaca, NY - 22 Mar 2011

Project Objectives

  • Identify and quantify various orographic effects on Great Salt Lake-effect precipitation

  • Generalize results for other lake-orographic scenarios

  • 4 project components

    • Updated (1997-2010) event climatology
    • Real case simulations / sensitivity studies
    • Idealized model simulations
    • Field program


You call that a lake?

  • 5-20 LE events per year, mean 13

  • Late fall, early spring peaks



GSL Area



Expected Orographic Effects

  • Upstream drying

  • Upstream wake

  • Flow channeling

  • Canyon flows

  • Direct orographic enhancement

  • Downstream drying



Expected Orographic Effects

  • Upstream drying

  • Upstream wake

  • Flow channeling

  • Canyon flows

  • Direct orographic enhancement

  • Downstream drying



Expected Orographic Effects

  • Upstream drying

  • Upstream wake

  • Flow channeling

  • Canyon flows

  • Direct orographic enhancement

  • Downstream drying



Expected Orographic Effects

  • Upstream drying

  • Upstream wake

  • Flow channeling

  • Canyon flows

  • Direct orographic enhancement

  • Downstream drying



Expected Orographic Effects

  • Upstream drying

  • Upstream wake

  • Flow channeling

  • Canyon flows

  • Direct orographic enhancement

  • Downstream drying



Expected Orographic Effects

  • Upstream drying

  • Upstream wake

  • Flow channeling

  • Canyon flows

  • Direct orographic enhancement

  • Downstream drying



Anatomy of a Utah winter storm



Anatomy of a Utah winter storm



Anatomy of a Utah winter storm



Anatomy of a Utah winter storm



Anatomy of a Utah winter storm



Anatomy of a Utah winter storm



Anatomy of a Utah winter storm



Anatomy of a Utah winter storm



Transitions can be abrupt…



5 Nov 2008 Event



5 Nov 2008 Event



5 Nov 2008 Event



5 Nov 2008 Event



5 Nov 2008 Event



5 Nov 2008 Simulations



Upstream Drying



Upstream Wake



Upstream Wake Observations



Orographic Parcel Modification



Removal of Upstream Terrain



No Upstream Orography



Flow Channeling Complications



Canyon/Downslope Flows



Removal of Downstream Terrain



Removal of Downstream Terrain



Conclusions

  • Upstream topography:

    • considerable drying at low levels prior to interaction with the Great Salt Lake (GSL)
    • removal yields 40-80% more precipitation
  • Downstream topography

    • Yields orographic ratios of 3:1 to 5:1
    • Orography directly enhances LE band and modifies position/intensity of convergence zones
    • Removal yields 60-90% reduction in precipitation


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