Arguably,
one of the most dangerous locations that a small boat
can be located is in the jaws of an ocean inlet with a
strong onshore wind and a maximum ebb tidal current. The
waves become greater in height and shorter in period.
These conditions
are very dangerous for all vessels, especially the
smaller ones. Today, while training with one of my boat
crews, we exited the Fort Pierce Inlet on a strong 4
knot ebb tidal current and nearly 20 knots of easterly
wind. Due to the opposing forces of wind and current,
the waves in the inlet were four to six feet in height.
Although we took green water over the bow, our 41 foot
Coast Guard vessel easily handled the conditions. After
about an hour of offshore training we began our transit
back into the inlet.
As we approached
the mouth of the inlet we were surprised to observe a
small 16 foot open boat, powered by an outboard engine,
approaching the mouth of the inlet from inshore. It they
had entered the larger waves just offshore from their
position they would have been in jeopardy of being
flooded by the six foot breaking waves. Wisely, the boat
full of young teenagers turned around and headed
inshore. Yes, they were wise to turn around, but were
they wise to approach so close to the dangerous
location? Would they have taken their boat so close to
the edge of Niagara Falls and turned around at the last
minute? Many a mariner has underestimated the dangers
associated with ocean inlets. If the boat's propeller
was suddenly fouled by debris or the engine had
mechanical problems, the strong ebb tidal current would
have quickly carried them into the larger seas and
threatened them with capsizing. Shortly after we moored
up from our training mission, this boat full of
teenagers ironically ran out of gas not far from the
station and called us for help. Needless to say they
were very lucky that they did not run out of gas during
their close approach to the inlet.
All mariners
should be extra careful when transiting North America's
inlets during the winter months. The ocean tends to get
rougher during the winter due to the much stronger winds
associated with this season. Our inlets become much more
dangerous places for small vessels. Not only is it
rougher, but the waters are colder, increasing the
threat of hypothermia in the event that a boater is
thrown into the water as a result of capsizing.
Before
determining whether to transit an inlet and head
offshore, mariners should obtain a marine weather
forecast and know the state of the tidal current. The
mariner should also know the limitations of their
vessel. Some vessels are more suitably designed to
handle the rougher conditions. The mariner must also be
careful not to over-estimate their personal abilities to
safely handle their vessel during the heavy weather
conditions.
If you were
already offshore when the weather deteriorated, causing
the inlet to become too dangerous to transit, it is
often best to wait offshore for the tidal current to
begin flooding. The flooding tidal current will
significantly improve the conditions, usually reducing
the wave height and increasing the wave period. An
attempt to transit during the worst conditions can
result in broaching, capsizing or even worse;
pitchpoling. Pitchpoling occurs when a following sea
lifts the stern of your vessel up so high that the
vessel tumbles end over end.
It is very
difficult to determine the inlet conditions from
seaward. While offshore your vision is limited to seeing
the smooth backs of the waves as they roll towards the
inlet or shore. Whereas from shore or inside the inlet,
you can clearly see how bad the conditions actually are
as you observe the whitewater spilling off the tops of
the waves. The nighttime conditions of darkness worsen
the situation 1000-fold. If you are concerned for your
safety, by all means call the nearest Coast Guard
Station and describe your situation.
Strong offshore
ocean currents can also cause dangerous conditions
similar to those found in inlets. The Gulf Stream
running north at 4 knots and an opposing wind of 20
knots will result in the wave height being considerably
increased and the wave period being decreased. The Gulf
Stream can also cause very dangerous conditions for
small boats. Transits across the "Stream"
should be carefully planned with a close eye kept on the
weather.
To learn more
about this topic I encourage you to complete a U.S.
Coast Guard Auxiliary Boating Skills and Seamanship
Course. To find out the location of the course being
offered near you call 1-(800) 368-5647. If you are
interested in helping others while helping yourself
please consider joining the U.S. Coast Guard. Call
1-(800) GET-USCG.