- How are you?
- no wind, the continuous calm.
similar response to a standard question enough to meet after a separation companion can testify to peace and that the problem is, and considerable.So what is calm, and the sea is why this term is used to describe quite often land situations?
Sea calm
This word has come to us, probably, from the Netherlands.That's where Peter the Great studied naval rules and terms.In German it sounds the same and mean the same thing, it is the total absence of wind.
it good or bad for the sailors?Now, in the age of powerful engines, someone may seem that such a state of the oceans, seas, rivers or lakes promotes good trip.But sailing is not possible to keep calm.Besides lull usually portend a storm.Therefore, a sailor like most of all, when ye not strong, weak, moderate or brisk wind.The details of the gradation can be found by reading the scale of Beaufort.
What is calm on the Beaufort scale?
There is a way to define a class agitation of the water surface, which allows to objectively evaluate the degree of danger.Of course, the "rule of thumb" is to make the inexperienced navigator is difficult, but some assistance in this matter have visible symptoms.There are quite tangible physical parameters to be measured by the instrument.For example, if the wind is completely absent.
Calm.What it is?
This state of the atmosphere in which the air is moving at speeds of up to twenty centimeters per second.There is almost perfectly smooth surface of the water and smoke from a fire does not deviate from the vertical.Calm (zero points) should not be confused with quiet weather (1 point for Beaufort), when a small ripple occurs.Wind - up to six meters per second, on the scallops no small waves foam.Weak storm in two points is characterized by short-wave vitreous and some even higher.Objectively measured the speed of the air masses near sea level up to 3.3 m / s.
Total distinguished dozen species, such as the appearance of visible "sheep" indicate storms in three points.It is also called light (with a weak should not be confused, it is a little, but stronger).Nine points is called a storm, by default.
have to compare and determine the correct score of the storm at a glance one can only sailor who has seen a wave of not only the image.But the full (also called dead) calm identifies any newcomer.
