Terms related to a Tropical Revolving Storm (TRS)
In this article we take a look at the important terms related to a Tropical Revolving Storm (TRS). The following are the important terms:
Track: The route over which the storm centre has already passed.
Path: Predicted route over which the storm centre is likely to travel.
Also read: Identifying & Responding to an approaching TRS.
Trough: The line drawn through the centre of the storm, at right angles to the track. Ahead of the trough, pressure falls whereas behind it, pressure rises.
Vertex or Cod: The westernmost longitude reached by the storm centre when recurving takes place.
Right hand semicircle (RHSC): That half of the storm centre that lies to the right of the observer who faces along the path of the storm.
Left hand semicircle (LHSC): That half of the storm centre that lies to the left of the observer who faces along the path of the storm.
Dangerous semicircle: RHSC in the NH and LHSC in the SH.
Navigable semicircle: LHSC in the NH and RHSC in the SH.
Dangerous quadrant: The advance quadrant of the RHSC in the NH and LHSC in the SH. When the existence of a TRS in the vicinity has been established, evasive action has to be taken to keep the vessel out of this quadrant.
Ref: Marine Meteorology by Capt H Subramaniam
