Download or read book Tropical Cyclone and Mid Latitude Characteristics and Physical Mechanisms Contributing to Extratropical Transition in the Western North Pacific written by Peter M. Klein and published by . This book was released on 2000-12-01 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study of extratropical transition (ET) of tropical cyclones (TCs) in the western North Pacific examines 30 cases during 1 June through 31 October 1994-98 using Navy analyses, plus geostationary satellite visible, infrared, water vapor, and microwave imagery. Based on the similarity of all 30 ET cases in satellite imagery, a three-dimensional conceptual model of the transformation stage of ET is proposed to describe how these ET cases evolve into an incipient, baroclinic cyclone. A climatology of ET during the period studied is presented, and three levels of re-intensification (little, moderate, and deep) are defined based on storm intensity at the end of ET. The re- intensification stage in nine cases is studied via Navy Coupled Ocean-Atmosphere Mesoscale Prediction System (COAMPS) control forecasts, simulations with the initial TC vortex removed, and simulations in which the initial TC vortex is displaced. These COAMPS simulations demonstrate that deep or moderate re- intensification depends on phasing of the poleward translating TC remnants with a critical region in which cyclogenesis is favored in the mid-latitude circulation. The mid-latitude circulation and TC contributions to the re- intensification stage are identified via superposition with the critical region and modification of its location and diagnostic values, respectively, and the combination of these contributions determines the final storm intensity at the end of ET.
Download or read book Tropical Cyclone and Mid Latitude Characteristicx and Physical Mechanisms Contributing to Extratropical Transition in the Western North Pacific written by Peter M. Klein and published by . This book was released on 2000 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extratropical Transition of Western North Pacific Tropical Cyclones written by Peter M. Klein and published by . This book was released on 1997-09-01 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extratropical transition (ET) of a tropical cyclone (TC) often results in a mid-latitude storm that threatens maritime and coastal interests. Cases of ET between 1 July through 31 October during 1994-1996 are reviewed using Navy Operational Global Atmospheric Prediction System (NOGAPS) analyses and hourly geostationary satellite imagery. Current conceptual models are found to be inadequate to explain the physical processes in ET. ET is redefined to have two stages: transformation, where the TC is transformed from a warm-core vortex into a baroclinic, cold-core extratropical cyclone, and re- intensification, where the transformed TC either deepens or dissipates, depending on the existence of upper4ropospheric support for extratropical cyclogenesis. ET is further defined in terms of two characteristic mid-latitude synoptic patterns: meridional, in which the cyclones have meridional tracks and tend to re-intensify less vigorously than zonal, which have zonal tracks and may deepen explosively. Review of NOGAPS 5OO-mb anomaly correlation scores in 1996 demonstrated that ET may be associated with significant NOGAPS errors. Sea-level pressure forecasts during ET events involving a merger tend to be too deep. In ET cases of rapidly deepening storms, NOGAPS tends to overforecast their intensity during transformation, and then underforecast during re- intensification. Rules of thumb are provided to assist forecasters in improving predictions of the track and intensity of storms undergoing ET.
Download or read book Monthly Weather Review written by and published by . This book was released on 2003 with total page 1164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Downstream Impacts Due to the Extratropical Transition of Tropical Cyclones Over the Western North Pacific written by and published by . This book was released on 2007 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of the eddy kinetic energy budget for four cases of extratropical transition (ET) with North Pacific tropical cyclones (TCs) is conducted. The cases compare varying ET and midlatitude flow characteristics. Each case was examined to determine the impacts of eddy kinetic energy generation and/or transfer on downstream development in the midlatitude circulation. Typhoon Tokage (October 2004) was a large TC that moved into a high-amplitude midlatitude circulation. Energetics analysis revealed that the ET of Tokage influenced the development of a deep trough over the central North Pacific before Tokage moved poleward and weakened transfer. Typhoon Banyan (July 2005) was a mid-summer case that influenced downstream development ultimately over the Aleutian Islands. Typhoon Guchol (August 2005) was a small TC that was dominated by midlatitude flow. However, the merger of Guchol with a midlatitude trough enabled development downstream of a separate trough. Typhoon Nabi was an intense TC that injected significant EKE into the midlatitude circulation during ET. Through downstream development, Nabi changed a zonal pattern over the North Pacific into an amplified pattern. These cases indicate that the ET process over the western North Pacific impacts the midlatitude circulation across the entire North Pacific basin.
Download or read book Dynamics and Predictability of Large Scale High Impact Weather and Climate Events written by Jianping Li and published by Cambridge University Press. This book was released on 2016-03-24 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the dynamical processes between high-impact weather and climate events, and between atmospheric and ocean phenomena.
Download or read book Diagnosing the Downstream Impact of Extratropical Transition Using Multimodel Operational Ensemble Prediction Systems written by Julia Henriette Keller and published by KIT Scientific Publishing. This book was released on 2014-10-16 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study examines the predictability during the extratropical transition (ET) of tropical cyclones using the THORPEX Interactive Grand Global Ensemble (TIGGE), a multimodel ensemble prediction system (EPS). It is shown that TIGGE exhibits more possible development scenarios than a single EPS. By analysing the eddy kinetic energy budget of forecast scenarios for two ET cases, extracted from an EPS, the impact of the transitioning tropical cyclones on the midlatitude flow is studied in detail.
Download or read book Extratropical Storm Evolution from Tropical Cyclones in the Western North Pacific Ocean written by Samson Brand and published by . This book was released on 1978 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examines 16 recurving tropical storms and typhoons that occurred in the western North Pacific Ocean in 1971, to determine the characteristics of the storms after they became extratropical. Many of the extratropical storms that evolved from tropical cyclones maintained destructive seas and winds as long as 5 days after the point of recurvature. Six of the 16 extratropical storms crossed the North Pacific and affected the Aleutians or western North America. Some of the physical processes associated with the evolution of extratropical storms from tropical cyclones are also discussed. (Author).
Download or read book Western North Pacific Tropical Cyclone Formation and Structure Change in TCS 08 and TCS 08 Field Experiment Support written by and published by . This book was released on 2010 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term goal of this project is to develop a better understanding of mesoscale and synoptic-scale processes associated with the entire life cycle of tropical cyclones in the western North Pacific. The inability to correctly identify tropical cyclone formation over the period of 24-48 hours poses a threat to shore and afloat assets across the western North Pacific. Furthermore, once a tropical cyclone has formed, the predictability of structure changes during intensification of the cyclone is very low, which is due to complex physical processes that vary over a wide range of space and time scales. Periods of reduced predictability occur throughout the tropical cyclone life cycle, which includes the decaying stage. Because decaying tropical cyclones often transition to a fast-moving and rapidly-developing extratropical cyclone that may contain gale-, storm-, or hurricane-force winds, there is a need to improve understanding and prediction of the extratropical transition phase of a decaying tropical cyclone. The structural evolution of the transition from a tropical to extratropical circulation involves rapid changes to the wind, cloud, and precipitation patterns that potentially impact maritime and shore-based facilities. The research being conducted on the comprehensive data sets gathered during the TCS-08 field program will result in increased accuracy associated with the prediction of tropical cyclone formation, intensification, and structural changes.
Download or read book The Remote Impacts of a Western Pacific Tropical Cyclone written by Craig E. Jakus and published by . This book was released on 1995 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The short term teleconnections arising from an individual tropical cyclone in tne western Pacific (typhoon Seth, October 1994) were examined using an operational global data assimilation system and numerical weather prediction model. During the data assimilation, the model's initial conditions were modified using a tropical cyclone bogusing procedure that either maintained or eliminated the individual storm. These different initial conditions were used in six extended-range forecasts of about 3.5 weeks duration. Three of these forecasts simulated the atmosphere with tne tropical cyclone and three without the storm. The ensemble average differences between the forecasts with the storm and those without it were used to infer the global teleconnection response to the tropical cyclone. This response was dominated by a strong and persistent Rossby wave train that extended from east Asia across the North Pacific into North America. This wave train was initiated when an anticyclonic circulation formed near Japan as the tropical cyclone approached the east Asian jet. The anticyclone formation was primarily the result of two factors: (1) vortex stretching; and (2) absolute vorticity advection as divergent outflow from the tropical cyclone crossed the large absolute vorticity gradient of the east Asian jet. The wave response was quasi-stationary. However, the basic wave train (i.e., the teleconnection pattern) developed within a week due to a relatively rapid eastward propagation of wave energy across the North Pacific and North America. In regions of strong jet flow, this propagation tended to parallel the flow while in regions of weaker flow, the propagation had stronger poleward or equatorward components. The wave train intensified well after the tropical cyclone and the initial wave formation process had dissipated.
Download or read book Tropical Cyclone Origin Movement and Intensity Characteristics Based on Data Compositing Techniques written by W. M. Gray and published by . This book was released on 1979 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Up-to-date results of recent tropical cyclone research at Colorado State University are presented. Particular attention is paid to new findings which impact on tropical cyclone analysis and forecasting efforts. Observational studies using large amounts of composited rawinsonde, satellite, and aircraft flight data have been performed to analyze global aspects of tropical cyclone occurrences, physical processes of tropical cyclone genesis, tropical cyclone intensity change, environmental factors influencing tropical cyclone turning motion 24-36 hours before the turn takes place, tropical cyclone intensity determination from upper tropospheric reconnaissance, and the diurnal variations of vertical motion in tropical weather systems. (Author).
Download or read book An Investigation Into the Relationship of Monthly Circulation Indices and Anomalies to Typhoon Development in the Western Pacific written by M. M. Orgill and published by . This book was released on 1960 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evidence is presented which indicates that a strong contributing factor for the frequency maximum in the Western Pacific area is its favorable position with respect to an active cyclogenetic region near the Bering Sea-Aleutian Island area. Monthly typhoon incidence was found to be significantly correlated with pressureheight anomalies in this region. The position and intensity of the western section of the subtropical ridge were also related to typhoon frequency but to a lesser extent. A modified Hovmoller diagram was prepared and analyzed for the 1956 typhoon season in order to examine on a daily synoptic basis the relationships derived from monthly mean data. The results suggests that there is an interaction between intensifying distal troughs in the circumpolar westerlies and troughs in the easterlies such that perturbational energy released into the easterlies is propagated through amplification of downstream troughs and ridges. (Author).
Download or read book Comparison of a Conceptual Model and Objective Indicators of Extratropical Transition in the Western North Pacific written by Gregory D. Fox and published by . This book was released on 2004-03-01 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of this research is to provide guidance to forecasters from the Joint (Air Force/Navy) Typhoon Warning Center (JTWC) in Pearl Harbor to use in differentiating between the stages of extratropical transition (ET) of tropical cyclones (TCs). Not only is ET relevant to the Department of Defense, since JTWC stops providing TC warnings once they have undergone ET, but it is also applicable to the meteorological community since there currently "is no commonly accepted definition of ET" (Jones et al 2003). This research compares the results of a conceptual model of ET using subjective satellite analysis with the results of objective indicators based on Navy Operational Global Atmospheric Prediction System (NOGAPS) model analyses. The ultimate goal is to find a way to reduce the negative impact of incorrect TC forecasting by providing tools which are more objective in defining stages of ET. This work discusses the birth, growth, and death of TCs by describing what energy sources are necessary for their growth and dissipation. Recent studies provide a conceptual model of ET with definitions of two stages and ways to use satellite analysis to identify them (Klein et al. 2000). While this conceptual model was being analyzed with data from the western North Pacific Ocean, TCs were also being analyzed using data from the Atlantic Ocean (Hart and Evans 2001). The research from the Atlantic led to the exploitation of objective indicators in a hodograph-like display (Evans and Hart 2003).
Download or read book Global Perspectives on Tropical Cyclones written by Johnny C. L. Chan and published by World Scientific. This book was released on 2010 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Make God's Word your everyday traveling companion. Thin and lightweight, Thomas Nelson's KJV Compact UltraSlim™ Bible boasts a complete and easy-to-read Bible that is ready to go when you are! A Bible you can be comfortable taking with you every day and everywhere you go, the Compact UltraSlim Bible is thin enough to tuck into your purse, briefcase, backpack, or glove compartment, yet large enough for easy readability. The Compact UltraSlim Bible is the perfect gift and ideal companion for today's Christian on the move. Features include: Presentation page Self-pronouncing text Words of Jesus in red Concordance Full-color maps Type size: 6 Part of the CLASSIC SERIES line of Thomas Nelson Bibles Compact UltraSlim Bibles sold to date: More than 135,000 The King James Version-The most successful Bible translation in history with billions of copies published Thomas Nelson Bibles is giving back through the God's Word in Action program. Donating a portion of profits to World Vision, we are helping to eradicate poverty and preventable deaths among children. Learn more and discover what you can do at www.seegodswordinaction.com.
Download or read book Tropical Cyclones of the Pacific written by Stephen Sargent Visher and published by . This book was released on 1925 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water related Disasters Climate Variability and Change written by Tomonori Matsuura and published by . This book was released on 2007 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Severe tropical storms and typhoons hit East Asia mainly from summer to autumn every year, bringing abundant water resources to the inhabitants. However, typhoons are among the most devastating of all natural disasters, causing the loss of many lives and giving rise to large economic losses. In Japan, the number of fatalities as a result of typhoons has been reduced because of new observation techniques, such as rawinsonde, meteorological satellites, radar, numerical forecasts, information services through radio and television, and the service of structures including river improvement and erosion and torrent control works. We have found, however, that recent severe tropical storms, the cyclone in Bangladesh in 1998 and Hurricane Katrina in the United States in 2005, generated massive destruction. In regard to typhoons, several time-period variations appear in the genetic numbers during 1951-2005: interannual frequency, interdecadal frequency, and long-term trends. This suggests that typhoons and hurricanes have become activated and this should relate to the recent global warming over the past 30 years. Therefore it is necessary to confirm how tropical storm activity will change in the future as a result of climate variability and fluctuation. The third report of the IPCC (the United Nation s Intergovernmental Panel on Climate Change) indicates that water-related disasters resulting from severe weather will change in quality in association with global warming. With the recent development of satellite remote sensing, ground and aircraft observations, numerical simulation techniques, and the investigations of global climate change, the relationship between global warming and tropical storms and, furthermore, their related disasters are making progress. Under these situations, our group planned to conduct a project, entitled Study on extreme weather events and water-related disasters as a result of climate variability and changes, to make use of projecting a long-term change of water-related disasters from 2002 to 2004. Based on our group s recent research and the related studies of other institute researchers in Japan, we prepared the results of tropical cyclones as recent reviews for publication as a book, Water-Related Disasters; Climate Variability and Change: Results of Severe Tropical Storms in East Asia. In this work, we introduce new numerical and data-analysis research concerning the relationship between East Asia s climate variability and changes and tropical storms, the storms by themselves, and the water-related disasters they cause. The first paper, Climate Changes and Tropical Storms in the Western North Pacific, reviews the general overview of typhoon classifications, developing mechanisms, structures, climatologies, and their disasters. The second paper, The Structure of Tropical Cyclones, addresses three stages: developing stage in general, mature stage, and developing stage in detail. The third paper, Extratropical Response to Typhoon-Induced Convective Heating over the Western North Pacific in Summer, is a new insight into how the typhoons are generated over the tropics and how they affect the midlatitude area through teleconnection. Paper number four, The Relationship Between ENSO and a Tropical Cyclone Simulated in a CGCM, deals with the characteristics of typhoon activity during the El Niño and La Niña periods. The fifth paper, Global Warming and Tropical Storms. Simulations Using General Circulation Models, presents the hot topic of tropical storm activity when global warming occurs. Paper number six, Potential Hydrologic Change Resulting from Greenhouse Warming, is a downscaling result of CGCM to a regional atmospheric model for global warming simulation. The seventh paper, The Influences of Climate Change in the Frequencies of Storm Rainfalls and Flood Disasters, addresses the particularly heavy rain caused by ENSO and typhoons in Japan. This paper also describes the impacts of global warming on heavy precipitation frequency and the flood risk of the Tama River Basin in Japan. The final paper in the book, Changes in Wave Climate in the Western North Pacific, presents a study of interannual variability and a future projection of summertime wave heights in the western North Pacific. We hope this book will be read and referred to not only by researchers of tropical cyclones and by climatologists, but also by the wider scientific community of researchers, science managers, and graduate students.
Download or read book The Extratropical Transition of Tropical Storm Banyan written by and published by . This book was released on 2006 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: "During July 2005, Typhoon Banyan recurved and underwent tropical transition over the western North Pacific. Coincident with the extratropical transition of Banyan, a large mid-tropospheric anticyclone developed immediately east of the recurving typhoon. The anticyclone was associated with a high-amplitude Rossby wave-like pattern that developed downstream of the anticyclone and extended across the North Pacific. Development of the anticyclone is examined with respect of the interaction between the outflow from Banyan and the midlatitude jet streak. During the poleward movement of TY Banyan, an anticyclonically-curved jet streak was forced by the merger of the upper-level outflow from Banyan and a jet streak associated with an upstream trough. The anticyclonic curvature was accentuated by the presence of a mid-tropospheric cyclone east of Banyan. The anticyclonic curvature increased as Banyan moved poleward and the mid-tropospheric cyclone moved equatorward. Thermodynamic forcing of the mid-tropospheric anticyclone is examined with respect to the poleward movement of warm moist air that ascends as it is advected around the eastern side of the decaying typhoon. The combination of dynamic and thermodynamic factors is examined in a potential vorticity framework to identify the development of the anticyclone east of Banyan and the transformation of Banyan into a midlatitude cyclone."--Page v.
