Tag Archives: Kuroshio current

Safety at Sea Redux

IMG_6150I recently had the opportunity to attend another Safety at Sea seminar at the Annapolis Naval Academy with some of my crew. Although I have probably taken half a dozen of these courses in the U.S. and the U.K., I always look forward to them and come out learning something new.

Opening remarks, in typical fashion focused on recounting disaster stories and the people who lost their lives in various offshore races including the Fastnet Race in 1979. It is an eye opener for many people new to going offshore, as they realize how serious being away from land can be, how quickly events can deteriorate and disaster can strike.

safety locationsAfter the opening remarks and some much needed coffee, the day kicked into gear with the first session focused on care and maintenance of safety equipment. The one takeaway which I would recommend to everyone, is not just have the safety equipment on board, but to train with it as well. Does everyone know how to test inflatable life jackets and repack them afterwards? Are heaving lines and lifeslings properly faked (packed in their bags)? Have you tried throwing them to see that they come out smoothly? Do you and the crew know where all the safety equipment is? A picture can be worth a thousand words here!

IMG_6017Later in the morning, gears shifted somewhat to focus on MOB (man person overboard) prevention and recovery. The mantra was, “Be Prepared!” Know your equipment and know your crew. Know what each of their limitations are (both crew and equipment). Do you practiced MOB drills regularly?

I make it a habit to have each one of my crew members practice MOB recovery. But then, that’s me being selfish. If I were to ever fall overboard, I want to spend as little time in the water as possible! Another practice that I’ve established on my boat is a clear set of rules as to when to wear a lifejacket and when to use a safety tether. In general, if you’re uncomfortable on the water or seasick, wear a lifejacket. If the weather is rough or the mainsail is reefed, wear a lifejacket. If visibility is low due to fog or heavy rain, wear a lifejacket. And, ALWAYS wear one when sailing overnight. At least, those are the rules on my boat.

IMG_6010In the afternoon the Navy midshipmen put on an in-water MOB demonstration under demanding conditions: air temperature was 39 degrees, water temperature was 42 degrees and winds were a consistent 20-25 knots. Several different MOB recovery methods were demonstrated including a very impressive MOB recovery while under spinnaker. The latter was accomplished in less than 2 minutes!

Later, it was back to the lecture hall to listen to two people from NOAA’s Ocean Prediction Service talk about weather awareness and forecasting. The discussion focused on understanding surface charts (for offshore sailing), identifying growing thunderstorms and squalls and steps to take both prior to taking the boat out and also while out on the water. It basically boils down to knowing the forecast BEFORE you go out and continue to monitor the weather while you’re out.

DSC01171The weather discussion set the stage for the next session – heavy weather sailing. Granted, the concept of heavy weather sailing is relative depending on one’s experience. If your sailing experience has been in a protected harbor on a 24-27 ft boat then 20 knots can seem rightly intimidating. On a larger boat sailing offshore, it could be much more than that. Crossing oceans, weather systems can pack a quite the punch with high winds and big seas. When I crossed the North Pacific Ocean in Winter from China to San Francisco, 35-40 knot winds with 20 foot seas and blue skies was a good day. 60 knot winds and +40 foot seas less so!

Running with a poled-out Yankee

Again here, preparation (read practice, practice, practice!) and having the proper equipment is key. Do you have the proper reef points on your sails? If going offshore, do you have a storm jib and storm trysail? Have you practiced rigging it beforehand? Trying to hank on a storm jib on the bow in high winds and big seas is not the time to learn. Is everything down below stowed away so nothing can fly around potentially causing injury? Is the crew prepared, meals planned ahead of time? There is obviously much more to sailing in heavy weather, but it can be “fun.” Again preparation is key! Know your own, your boat and your crew’s limitations.

No Safety at Sea seminar would be complete without discussing medical issues and first aid. This year, the focus was on dealing with seasickness and hypothermia. Although many dismiss seasickness or mal de mer as the scourge of newbies, that is not the case. Given the right conditions, almost anyone can find themselves overcome by seasickness. After 30 years of sailing in sometimes challenging conditions, I thought I was. All it took was a bad storm several hundred miles off the coast of Japan with 50 knot winds blowing against the direction of the Kuroshio current and I finally understood what seasickness is all about!

I should note that seasickness by itself is not a medical emergency. It will subside after a few days at sea – it may not be pleasant, but it will subside. However, it can lead to symptoms that do need to be monitored, chief among those is dehydration. If you or one of your crew becomes seasick, it is vital that fluids are given (and a small garbage bag by his/her bunk!).

Prevention though, does wonders here. If someone is prone to seasickness, then medicine or other remedies should be administered before leaving the dock or before heavy weather hits. Underway, it can be helpful to stay on the deck and focus on the horizon. If someone is beginning to get seasick, giving him/her the helm can help significantly – provided the conditions warrant it. If it is challenging conditions you would want your better helmsperson to steer the boat.

All in all, I found it a great weekend seminar hearing new ideas and reinforcing old ones. It was also a great weekend for some of my new crew. They realized the seriousness of going offshore and how quickly events can deteriorate if you are not prepared. But, I think they also see that sailing/racing offshore with the proper preparation and focus on safety can be exciting and fun. One phrase I learned in the UK with my Clipper training, and always like to remind my crew, is that “safety never takes a day off, because danger never has a holiday.”

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Ocean Routing Pt 1, or How do I Cross the Pacific?

With just a couple of weeks to go until I jump aboard the Clipper yacht Singapore for a grueling race almost halfway around the world from Qingdao, China to New York, thoughts turn to the North Pacific part of the race and more specifically, how do I get to California from China?  On Google Maps (or most flat maps, known as Mercator projections) the route – at first glance – looks fairly straight forward.  Simply round the southern tip of Japan and head east straight across the Pacific, passing a tad north of Hawaii on the way to California.  Unfortunately, the Earth isn’t flat, so such a route isn’t practical.

Because the earth is round (technically, an oblate spheriod) the great circle route will actually be the shortest distance between two points.  To visualize this, imagine a sphere with the top and bottom representing the poles.  A great circle would divide the sphere into two equal hemispheres.  If you did the math (which I will spare the reader here) this cut would represent the shortest distance between two points on the surface of the sphere along that line.

What does that mean for the Clipper Race on the leg from Qingdao, China to San Francisco?  It basically means that the shortest distance (great circle route) will take us relatively close to Alaska’s Aleutian Islands.  Any thoughts I initially had of idyllically sailing by Hawaii on the way to California were unfortunately just whimsical fantasies.  Instead, it will be a cold slog through the North Pacific at a time when storms race across the ocean from Japan and even Siberia to Alaska.

Having realized that late last year, I had begun to have second thoughts.  Do I really want to be sailing across the Pacific at a time when winter gales could easily bring cold, driving snow or sleet?  And, not just for a couple of days, but potentially for weeks at a time.  Cold, wet snow and slush and 30-40 ft waves washing across the deck with no place to hide above, and no heater down below.  Where is the fun in that?  When I have those second thoughts, I try to remind myself that I’m taking on the challenge of a lifetime and it will be an experience that I will cherish for decades to come.  As Sir Robin Knox Johnson is wont to say, “more people have climbed Mt. Everest than sailed around the world.”  Then again, perhaps I just need to take a more zen-like approach to it and repeat over and over, “cold is just a state of mind.”

It’s not just the Great Circle Route

Although the great circle route is the optimal route for crossing oceans, there is actually much more to plotting a route across the North Pacific then just following the great circle.  For sailboats, weather plays a large role in ocean routing.  Being found under a high pressure system with associated sunny weather, can typically mean little to no wind.  Not the best conditions if you’re trying to win an ocean race.  Conversely, being stuck under an intense low pressure system can mean gale or hurricane force winds with reduced (or no) sails and being tossed about to-and-fro at the mercy of the weather gods.  That’s also not ideal for winning a race.  The happy medium lies somewhere in between, and here is where planning is essential both for winning a race or a podium finish and for safety.  For offshore racing, optimal route planning takes into account the great circle route as a first step.  Then, prevailing or forecasted ocean currents should be taken into consideration, and last but certainly not least, forecasted weather.

The race in detail

Leg six from Qingdao to San Francisco can be broken down into three sections for route planning.  The first is from Qingdao, down through the East China Sea to the southern tip of Japan.  The next section is along the coast of Japan and the Eastern North Pacific to roughly the international dateline.  The third and last section is the Western North Pacific and offshore the U.S. coastline to the Golden Gate bridge.

On the first section, leaving Qingdao and sailing through the East China Sea to the tip of Japan, the route is fairly straight forward.  Just head southeast towards the southern tip of Japan and avoid any islands along the way.  The currents in the East China Sea are primarily wind-driven and thus do not hold much tactical advantage.  As far as the weather is concerned March tends to be the busy time of the year for lows to develop near the south coast of Japan.

Rounding the southern tip of Japan, the route follows the Japanese coast midway up threading between various islands southwest of Kyushu and later, south of central Japan.  Flowing along the coast of Japan is the Kuroshio current, one of the largest ocean currents in the world. The Kuroshio current typically flows around 3 knots, but can flow at speeds of 4 knots or more in some places.  Because of the swift speeds of the Kuroshio current (it can travel 75 miles or more in a day), it can play a major role in gaining a tactical advantage in the race up the Japanese coast and out into the eastern portion of the North Pacific. Finding the swiftest part of the current can quickly spring a boat into a decisive lead.

The Kuroshio current carries warm water up from the equatorial region, and because of this, it has a major impact on the development of weather systems over the Pacific Ocean, in particular in the early spring, when Mongolian cold weather meets the warm waters of the Kuroshio current.  The area south of Japan is one of the areas where low pressure systems (i.e. rain and wind) develop before the storms generally move northeast towards the Bering Sea and Alaska.  Because of the swiftness of the northeasterly flowing current, strong winds out of the north can quickly lead to steep waves that are bone-jarring as the boat drops off the back side (wind against tide tends to form rather steep choppy waves).  Trying to sail through these types of waves can also slow the boat down considerably, so finding the balance between riding the current and optimal wind angles become critical.

Midway up the Japanese coast, the great circle route begins its long arc across the North Pacific crossing the International Dateline at around 44° North.  However, during March winter conditions tend to prevail (i.e. strong storms!) which will demand a more southerly route with us likely crossing the meridian around 40° N.  Through much of the Pacific crossing, the currents are generally easterly with no real difference in location or speed (the North Pacific Gyre is relatively constant here).

The trick on this section of the race is to find the sweet spot between not going too far north and risk being beset by fierce Pacific storms or going too far south and being becalmed by the Pacific High.  As the synoptic chart (large-scale weather chart) below shows, lows (L) with hurricane force winds can develop around 44° N, while the Pacific High (H) and associated light-to-no winds can reach up to 38° N.  Successfully threading the way between these type of moving weather systems in mid- to late-March will be the key to either gaining or maintain a leading position.

After crossing the International Dateline (which separates the Eastern and Western Hemispheres), the sailing route will likely continue due east for a bit before beginning to dip south.  Weather patterns on this side of the Pacific tend to be more stable and are really determined by the Pacific High (technically known as the North Pacific subtropical anticyclone) which tends to be a relatively stationary weather system over the mid-North Pacific Ocean.

Roughly, 300 miles from the US coast, the California current (which is the eastern component of the North Pacific Gyre) runs down the western coast at a relatively slow speed of about half a knot. As with other currents associated with the North Pacific Gyre, eddies or counter-currents can spin off the main current stream.  While generally weak, they flow in the opposite direction of the direction you want to go and if caught in them, could slow the boat down enough to drop back in race standings. Weather-wise, there is little to worry about on this section as the fierce Pacific storms are well north of our track, so our route will likely follow rather closely to the great circle route until we finally sail under the majestic spires of the Golden Gate Bridge.