The Key Role of Diabatic Outflow in Amplifying the Midlatitude Flow: A Representative Case Study of Weather Systems Surrounding Western North Pacific Extratropical Transition

AbstractRecurving tropical cyclones (TCs) undergoing extratropical transition (ET) may substantially modify the large-scale midlatitude flow pattern. This study highlights the role of diabatic outflow in midlatitude flow amplification within the context of a review of the physical and dynamical processes involved in ET. Composite fields of 12 western North Pacific ET cases are used as initial and boundary conditions for high-resolution numerical simulations of the North Pacific–North American sector with and without the TC present. It is demonstrated that a three-stage sequence of diabatic outflow associated with different weather systems is involved in triggering a highly amplified midlatitude flow pattern: 1) preconditioning by a predecessor rain event (PRE), 2) TC–extratropical flow interaction, and 3) downstream flow amplification by a downstream warm conveyor belt (WCB). An ensemble of perturbed simulations demonstrates the robustness of these stages. Beyond earlier studies investigating PREs, recurv...

[1]  R. Schumacher,et al.  Moisture Transport into Midlatitudes ahead of Recurving Tropical Cyclones and Its Relevance in Two Predecessor Rain Events , 2012 .

[2]  R. Torn.  Diagnosis of the Downstream Ridging Associated with Extratropical Transition Using Short-Term Ensemble Forecasts , 2010 .

[3]  George C. Craig,et al.  The extratropical transition of hurricane Irene (1999): A potential‐vorticity perspective , 2004 .

[4]  Tae-Young Lee,et al.  Remote effects of tropical cyclones on heavy rainfall over the Korean peninsula – statistical and composite analysis , 2012 .

[5]  Sarah C. Jones,et al.  The extratropical transition of tropical cyclones : forecast challenges, current understanding, and future directions , 2003 .

[6]  L. Bosart,et al.  An Analysis of Multiple Predecessor Rain Events ahead of Tropical Cyclones Ike and Lowell: 10-15 September 2008 , 2012 .

[7]  C. Davis,et al.  The impact of Typhoon Jangmi (2008) on the midlatitude flow. Part II: Downstream evolution , 2013 .

[8]  Michael Riemer,et al.  Dynamics of Rossby Wave Packets in a Quantitative Potential Vorticity–Potential Temperature Framework , 2016 .

[9]  Christian M. Grams,et al.  European high‐impact weather caused by the downstream response to the extratropical transition of North Atlantic Hurricane Katia (2011) , 2015 .

[10]  Sarah C. Jones,et al.  Characteristics of the TIGGE multimodel ensemble prediction system in representing forecast variability associated with extratropical transition , 2011 .

[11]  Yuqing Wang,et al.  The Role of Typhoon Songda (2004) in Producing Distantly Located Heavy Rainfall in Japan , 2009 .

[12]  Donald R. Johnson,et al.  The Coupling of Upper and Lower Tropospheric Jet Streaks and Implications for the Development of Severe Convective Storms , 1979 .

[13]  K. Emanuel,et al.  Potential Vorticity Diagnostics of Cyclogenesis , 1991 .

[14]  T. Hewson,et al.  A classification of FASTEX cyclones using a height‐attributable quasi‐geostrophic vertical‐motion diagnostic , 2002 .

[15]  Sarah C. Jones,et al.  The impact of Typhoon Jangmi (2008) on the midlatitude flow. Part I: Upper‐level ridgebuilding and modification of the jet , 2013 .

[16]  L. Bosart,et al.  The Antecedent Large-Scale Conditions of the “Perfect Storms” of Late October and Early November 1991 , 2010 .

[17]  H. Dacre,et al.  The Spatial Distribution and Evolution Characteristics of North Atlantic Cyclones , 2009 .

[18]  S. Limbach,et al.  On the Co-Occurrence of Warm Conveyor Belt Outflows and PV Streamers* , 2014 .

[19]  R. Torn,et al.  Comparison of Wave Packets Associated with Extratropical Transition and Winter Cyclones , 2015 .

[20]  Evelyne Richard,et al.  Remote impact of North Atlantic hurricanes on the Mediterranean during episodes of intense rainfall in autumn 2012 , 2015 .

[21]  P. Harr,et al.  An eddy kinetic energy view of physical and dynamical processes in distinct forecast scenarios for the extratropical transition of two tropical cyclones , 2014 .

[22]  Lance F. Bosart,et al.  The Transformation of Tropical Storm Agnes into an Extratropical Cyclone. Part I: The Observed Fields and Vertical Motion Computations , 1982 .

[23]  Lance F. Bosart,et al.  A Climatological Analysis of the Extratropical Flow Response to Recurving Western North Pacific Tropical Cyclones , 2013 .

[24]  Thomas J. Galarneau.  Influence of a predecessor rain event on the track of Tropical Cyclone Isaac (2012) , 2015 .

[25]  L. Bosart,et al.  Predecessor Rain Events ahead of Tropical Cyclones , 2010 .

[26]  J. Quinting,et al.  On the Impact of Tropical Cyclones on Rossby Wave Packets: A Climatological Perspective , 2016 .

[27]  Christian M. Grams,et al.  Importance of latent heat release in ascending air streams for atmospheric blocking , 2015 .

[28]  Lance F. Bosart,et al.  The Extratropical Transition and Precipitation Distribution of Hurricane Floyd (1999) , 2003 .

[29]  Russell L. Elsberry,et al.  Extratropical transition of tropical cyclones over the Western North pacific. Part II: The impact of midlatitude circulation characteristics , 2000 .

[30]  L. Bosart,et al.  Synoptic-Scale Environments of Predecessor Rain Events Occurring East of the Rocky Mountains in Association with Atlantic Basin Tropical Cyclones* , 2013 .

[31]  Yongti Zhu,et al.  Tropospheric rivers? – A pilot study , 1992 .

[32]  F. Martin Ralph,et al.  The Development and Evolution of Two Atmospheric Rivers in Proximity to Western North Pacific Tropical Cyclones in October 2010 , 2013 .

[33]  R. Plant,et al.  The dynamics of a midlatitude cyclone with very strong latent‐heat release , 2004 .

[34]  L. Bosart,et al.  A Composite Perspective of the Extratropical Flow Response to Recurving Western North Pacific Tropical Cyclones , 2015 .

[35]  Sarah C. Jones,et al.  Predictability Associated with the Downstream Impacts of the Extratropical Transition of Tropical Cyclones: Methodology and a Case Study of Typhoon Nabi (2005) , 2008 .

[36]  J. Steppeler,et al.  Meso-gamma scale forecasts using the nonhydrostatic model LM , 2003 .

[37]  M. Tiedtke.  A Comprehensive Mass Flux Scheme for Cumulus Parameterization in Large-Scale Models , 1989 .

[38]  Toby N. Carlson,et al.  Airflow Through Midlatitude Cyclones and the Comma Cloud Pattern , 1980 .

[39]  F. Vitart,et al.  Atmospheric predictability and Rossby wave packets , 2015 .

[40]  L. Scheck,et al.  The Resonant Interaction of a Tropical Cyclone and a Tropopause Front in a Barotropic Model. Part I: Zonally Oriented Front , 2011 .

[41]  M. Riemer,et al.  The impact of extratropical transition on the downstream flow: An idealized modelling study with a straight jet , 2008 .

[42]  Russell L. Elsberry,et al.  Extratropical Transition of Tropical Cyclones over the Western North Pacific. Part I: Evolution of Structural Characteristics during the Transition Process , 2000 .

[43]  John Methven,et al.  Systematic model forecast error in Rossby wave structure , 2014 .

[44]  A. Thorpe,et al.  Attribution concepts applied to the omega equation , 1996 .

[45]  Sarah C. Jones,et al.  Predictability Associated with the Downstream Impacts of the Extratropical Transition of Tropical Cyclones: Case Studies , 2008 .

[46]  Heini Wernli,et al.  A Lagrangian‐based analysis of extratropical cyclones. II: A detailed case‐study , 1997 .

[47]  Analysis of an ex‐tropical cyclone after its reintensification as a warm‐core extratropical cyclone , 1998 .

[48]  M. Riemer,et al.  Interaction of a tropical cyclone with a high‐amplitude, midlatitude wave pattern: Waviness analysis, trough deformation and track bifurcation , 2014 .

[49]  Ron McTaggart-Cowan,et al.  Sensitivity Testing of Extratropical Transitions Using Potential Vorticity Inversions to Modify Initial Conditions: Hurricane Earl Case Study , 2001 .

[50]  A. Aiyyer.  Recurving western North Pacific tropical cyclones and midlatitude predictability , 2015 .

[51]  B. Hoskins,et al.  A new look at the ?-equation , 1978 .

[52]  M. Sprenger,et al.  The Lagrangian analysis tool LAGRANTO - version 2.0 , 2015 .

[53]  Huw C. Davies,et al.  Tropopause-Level Waveguides , 2010 .

[54]  Heini Wernli,et al.  A Lagrangian‐based analysis of extratropical cyclones. I: The method and some applications , 1997 .

[55]  Heini Wernli,et al.  The LAGRANTO Lagrangian analysis tool – version 2.0 , 2015 .

[56]  Joo‐Hong Kim,et al.  Favorable versus unfavorable synoptic backgrounds for indirect precipitation events ahead of tropical cyclones approaching the Korean Peninsula: A comparison of two cases , 2013, Asia-Pacific Journal of Atmospheric Sciences.

[57]  L. Bosart,et al.  Postlandfall Tropical Cyclone Reintensification in a Weakly Baroclinic Environment: A Case Study of Hurricane David (September 1979) , 1995 .

[58]  L. Bosart,et al.  Relationships between Large-Scale Regime Transitions and Major Cool-Season Precipitation Events in the Northeastern United States , 2010 .

[59]  Julia H. Keller,et al.  A quantitative assessment of the sensitivity of the downstream midlatitude flow response to extratropical transition of tropical cyclones , 2015 .

[60]  Huw C. Davies,et al.  Diagnosis and Dynamics of Forecast Error Growth , 2013 .

[61]  R. Elsberry,et al.  Extratropical transition of western North Pacific tropical cyclones: Midlatitude and tropical cyclone contributions to reintensification , 1997 .

[62]  Andrea A. Lang,et al.  The structure and evolution of lower stratospheric frontal zones. Part II: The influence of tropospheric ascent on lower stratospheric frontal development , 2013 .

[63]  Ulrich Corsmeier,et al.  The key role of diabatic processes in modifying the upper‐tropospheric wave guide: a North Atlantic case‐study , 2011 .

[64]  R. Elsberry,et al.  Simulations of the Extratropical Transition of Tropical Cyclones: Phasing between the Upper-Level Trough and Tropical Cyclones , 2007 .

[65]  J. Thepaut,et al.  The ERA‐Interim reanalysis: configuration and performance of the data assimilation system , 2011 .

[66]  J. G. Charney,et al.  The Use of the Primitive Equations of Motion in Numerical Prediction , 1955 .

[67]  H. Wernli,et al.  A Global Climatology of Tropical Moisture Exports , 2013 .

[68]  C. Thorncroft,et al.  The Extratropical Transitions of Hurricanes Felix and Iris in 1995 , 2000 .

[69]  Russell L. Elsberry,et al.  Extratropical Transition of Western North Pacific Tropical Cyclones: An Overview and Conceptual Model of the Transformation Stage , 2000 .

[70]  M. Juckes,et al.  The Resonant Interaction of a Tropical Cyclone and a Tropopause Front in a Barotropic Model. Part II: Frontal Waves , 2011 .

[71]  Heini Wernli,et al.  Warm Conveyor Belts in the ERA-Interim Dataset (1979–2010): Part I: Climatology and Potential Vorticity Evolution , 2014 .

[72]  Sarah C. Jones,et al.  The downstream impact of tropical cyclones on a developing baroclinic wave in idealized scenarios of extratropical transition , 2010 .

[73]  M. Rodwell,et al.  Characteristics of occasional poor medium-range weather forecasts for Europe , 2013 .

[74]  C. Grams.  Quantification of the Downstream Impact of Extratropical Transition for Typhoon Jangmi and Other Case Studies , 2015 .

[75]  Uang,et al.  The NCEP Climate Forecast System Reanalysis , 2010 .

[76]  B. Hanstrum,et al.  The Capture of Tropical Cyclones by Cold Fronts off the West Coast of Australia , 1994 .

[77]  E. Chang.  Wave Packets and Life Cycles of Troughs in the Upper Troposphere: Examples from the Southern Hemisphere Summer Season of 1984/85 , 2000 .

[78]  Chun‐Chieh Wu,et al.  A Numerical Study of the Feedback Mechanisms of Hurricane-Environment Interaction on Hurricane Movement from the Potential Vorticity Perspective. , 1996 .

[79]  H. Wernli,et al.  Life Cycle Study of a Diabatic Rossby Wave as a Precursor to Rapid Cyclogenesis in the North Atlantic—Dynamics and Forecast Performance , 2011 .