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How often are you surprised by the weather?
How often does the wind clock or back…increase or decrease
when you weren’t expecting it?
How confidently can you pin-down the time of a frontal passage to within an
hour or two?
How sure are you in the morning that you’ll sleep like a baby in the
anchorage you plan for tonight?
How confident are you that you should travel 30 miles to the next anchorage
today in more-favorable winds instead of waiting until tomorrow? If you’re
surprised more than once or twice a month, the knowledge I share in this
book can help.
Table of Contents
PART ONE: Understanding Basic Weather
Dynamics:
Causes of Weather page 4
It’s a matter of Scale 10
Global energy transfer 11
Cold Fronts 14
Cold Front Wind Shifts 15
Instability 16
Dew Point 19
Lapse Rate 22
Measures of Lapse Rate 24
HI 28
RIDGE 32
TROF 33
LO 35
Squalls 36
Tropical Systems and Hurricanes 37
Interesting Case Studies 39
Cloud Types 47
Weather-Related Topics 52
PART TWO: Forecast Products… how to get them and how
to use them (organized by means of reception)
Intro to Products page 56
Interpretation 60
VHF – US Coastal Forecasts, NOAA voice text 61
VHF – Bahamas Forecasts 64
AM/FM Radio – Bahamas Met Office Forecasts 67
SSB Receiver – voice text 68
WeatherFax w/SSB Receiver, computer, software 75
SSB / Ham Transceiver for Interactive Voice Weather 79
Add an HF e-mail Modem 85 - 98
• ESP’s: (WinLink, SailMail,
MarineNet, Cruise-E-Mail) 86-90
• Chris Parker’s e-mail Forecast 92
• BuoyWeather Forecasts 93
• Tropical Discussion from NOAA 97
Satellite & Cell Phones (Iridium,
Globalstar InMarSat,
Cell phones, 802.11.b, etc.) 99-103
• Optimizing Satellite and
Cell Phones 100
GOES Weather Satellite Receiver 103
GRIBs 106 - 113
• GRIB Data 107
• GRIB viewers (ViewFax, Xaxero’s WindPlot, MaxSea/NavCenter, Nobletec,
RayTec, SailMath’s Deckman, Ocens/WeatherNet) 111-113
WeatherNet 114
A look into the Future 116
Appendix A – NOAA FTP details 117
Glossary 129
Foreword
I trust you will find this a very different book about
weather than anything else currently published, and I hope you will find it
useful enough to earn a place at your nav station right beside your charts
and cruising guides, and that you will refer to it as frequently as you do
them.
When I began writing this book, I intended to write a handy
reference book which anyone could pick-up, turn to a given page, and read a
thorough discussion of a weather topic of interest. As the book progressed,
however, it became clear the various topics were just too inter-related and
complex for a simple reference-type book to be of much use to most readers.
My advice is to slowly read this book from beginning to end;
most topics are covered in just a page or two, and important topics are
covered several times in increasing depth and detail as additional concepts
become familiar.
Hopefully this book will answer most of the questions you
have about weather in the Bahamas and South East US Coast, and how to get
and interpret the best and most-relevant weather products, given the
electronic equipment you have onboard. My goal is to take a fresh, simple,
easy-to-understand, and at times very different approach...yet be thorough,
detailed and accurate.
It’s also not a book just about weather…I explore many
topics of keen interest to mariners (like how to pick a good anchorage for
the weather, how to pick a good cut to pass through and when to cross the
Gulf Stream) which weather-only books fail to address and which non-weather
authorities have generally failed to cover in the manner I do. The scope of
this book is, however, limited by design. This is a basic book about marine
weather applicable to the Bahamas and Southeast US Coast. It’s also covers
some advanced topics and contains unique, up-to-date reference guides to the
various weather analysis and forecast products (and exactly how to access
them) available from numerous sources applicable to this geographical area.
While most of what I write is scientifically accurate, I have taken
occasional liberties in an effort to simplify discussions and enhance
understanding of complex topics. For additional information, I recommend
browsing various educational Web sites for topics of interest to you. From
reading this book, you will have a good understanding of the basics, so I’d
jump right into educational Web sites from NOAA and various Universities.
You might start at: http://www.education.noaa.gov/cweather.html and explore
from there.
Finally, this is a First Edition of this book and I’m a
novice author. By purchasing this work, you will have a valuable tool at
your disposal and you will make work on an expanded, updated and even better
Second Edition possible. As such, anyone possessing a First Edition will
receive a special discount on periodic Updates as well as on the Second
Edition, when it becomes available. I deeply appreciate any clarifications,
corrections or constructive criticisms you
About the Author
Chris Parker, his partner Michael Zidziunas and Wizard
the cat have lived aboard for 12 years and been full-time cruising for 5
years, spending each winter in the Bahamas, first on their 1965 Cheoy Lee
30, now on their 1966 Morgan 34 Bel Ami. Chris has been fascinated with
weather from childhood, and actively forecast weather each day starting in
3rd grade. In high school he broadcast widely-listened to
forecasts on WBSL, an FM radio station in Western Massachusetts, then
studied meteorology for 2 years in college. He’s also a hanglider pilot,
where his life depends on keen observation of weather. But much of what he’s
learned has been on the water. How Weather Influences our Cruising For most
of us the weather has a major impact on our enjoyment of the day. Most
sailors enjoy nice easy reaches, while power boaters prefer flat calm or
wind on the bow or maybe stern. Almost everyone I know prefers sheltered,
comfortable
anchorages. We learned what’s possibly the most important lesson for
cruisers 4 years ago:
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We went cruising with a plan…most of us are paid good
money in Corporate America to “plan your work and work your plan.” That
means we go from point A to point B today. The Plan looks fine on the
chart, and it seems to make sense when we plan our trip…but it doesn’t
take into account the 20-knot head winds out there today.
Why not wait 2 days for an easy reach, if you’re confident in the
forecast? And when you do go, and the wind is a bit
stronger than you like, why not be flexible enough to stop at an
alternate anchorage and have a nice evening rather than getting
beaten-up? Flexibility and confidence in the weather are key. We’re
always ready to change plans…sometimes radically…when
conditions change. That, more than anything else, has been the key to
our enjoying cruising on our little boat. |
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