feedback
Enter marine-related query and AI bot will look for best match in our DB.
 

The half of a cyclonic Storm in which the rotary and forward motions of the storm reinforce each other and the winds tend to blow a vessel into the storm track. In the Northern Hemisphere this is to the right of the storm center (when facing the direction the storm is moving) and in the Southern Hemisphere it is to the left. The opposite is the LESS DANGEROUS or NAVIGA- BLE SEMICIRCLE.



Related Terms

NAVIGABLE SEMICIRCLE

The half of a cyclonic storm area in which the rotary and forward motions of the storm tend to counteract each other and the winds are in such a direction as to tend to blow a vessel away from the storm track. In the Northern Hemisphere this is to the left of the storm center and in the Southern Hemisphere it is to the right.

CYCLONE

  1. A meteorological phenomena characterized by relatively low atmospheric pressure and winds which blow counterclockwise around the center in the Northern Hemisphere and clockwise in the Southern Hemisphere. 2. The name by which a tropical storm having winds of 34 knots or greater is known in the South Indian Ocean.

SCOPE

The ratio of length of anchor rode in use to the vertical distance from the bow of the vessel to the bottom of the water. Usually six to seven to one for calm weather and more scope in storm conditions.

UNFAVORABLE CURRENT

A current flowing in such a direction as to decrease the speed of a vessel over the ground.

JUNCTION BUOY

A buoy which, when viewed from a vessel approaching from the open sea or in the same direction as the main stream of flood current, or in the direction established by appropriate author- ity, indicates the place at which two channels meet.

SWINGING CIRCLE

The range of drift in a circular direction normally due to current, tide or wind shift, when a vessel is moored to a buoy.

L.C.B.

Longitudinal Centre of Buoyancy. The point, on the fore and aft line of a vessel at which the upward force of buoyancy acts. It is measured from amidships either forward or aft.

BOW LINES

The mooring lines extending from the foremost part of a vessel to the shore usually leading forward preventing movement astern.

JUNCTION MARK

A navigation mark which, when viewed from a vessel approaching from the open sea or in the same direction as the main stream of flood current, or in the direction established by appropri- ate authority, indicates the place at which two channels meet.

PRECESSION

The change in the direction of the axis of rotation of a spinning body, as a gyroscope, when acted upon by a torque. The direction of motion of the axis is such that it causes the direction of spin of the gyroscope to tend to coincide with that of the impressed torque. The horizontal component of precession is called drift, and the vertical component is called topple. Also called INDUCED PRECESSION, REAL PRECESSION.

Related questions

MarineProHelp 2018 - 2020

First time here? Check out the FAQ!

If you've arrived to new location and wonder how to dress comfortably according to weather, check Comfiesto

×