Heavy Weather Avoidance and Route Design Review

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Heavy Weather Avoidance and Route Design ReviewThis book forms an excellent basis for a "mental model" of upper level 500 mb contour charts and their relevance to surface weather, The initial explanatory chapters suffer from some murkiness in terminology: Are we talking about temperature, pressure, pressure surfaces, pressure "lines" etc.? But a careful reading will sort these terms out and will clarify the terminology in the reader's mind. The dynamic, three dimensional nature of the earth's atmosphere presents a difficult modelling problem for both the presenter and the mariner trying to derive information from the presentation that is useful to him. I would recommend this book as a worthy addition to any professional library, both for the commercial and the recreational mariner. It is both a good off-season study for the recreational boater and a practical on-board reference aid in interpreting weather information received.
The later chapters on weather routing and storm analysis are particularly valuable.
AHD61, Master 1600 Ton (oceans) and LCDR USN (Retired) (Submarine Service)
Heavy Weather Avoidance and Route Design OverviewThe 500Mb chart is the key that unlocks the three-dimensional nature of the atmosphere and helps answer the mariner's two most important weather questions: will the system intensify, and where is it headed?
In Heavy Weather Avoidance, Chen and Chesneau merge the seamanship of a master mariner and the forecast expertise of a senior meteorologist, providing readers with double-barrel exposure to what actually goes on in the atmosphere and on the sea s surface. Many weather texts offer an academic look at weather systems, complete with model algorithm derivations and equations depicting heat transfer. These fundamentals may be the cornerstone of the science, but commercial mariners and recreational sailors are more concerned about the implications of volatile weather rather than its fluid dynamics. From start to finish the authors have cut to the chase, creating a readable text brimming with useful graphics. It s focused on the root cause of how and why bad weather develops and where it s likely to go. There's enough theory provided for a reader to get a feel for how air mass energy transfer works, but just as the theoretical aspect takes on a mission of its own, there s a shift to more practical self-forecasting and storm avoidance wisdom. Captain Ma-Li Chen shares his well-tested routing strategy and describes how it factors in the use of the 500 Mb chart. His game plan includes a sector analysis of short wave troughs, breaking them into four distinct zones and prioritizing the relative safety of navigating through each region. (From the foreword by Ralph Naranjo, Technical Editor Practical Sailor Magazine (Past Vanderstar Chair, U.S. Naval Academy)

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