The navigable semicircle of a tropical storm in the South Indian Ocean is located on which side of the storm's track?
• Tropical cyclone wind circulation direction in the Southern Hemisphere • Definition of the navigable (safe) semicircle vs. dangerous semicircle • How storm motion + wind rotation combine on each side of the track
• First, picture looking down at the South Indian Ocean on a map. In the Southern Hemisphere, which way do winds circulate around a low-pressure system? • On the side of the storm where the storm’s forward motion and the wind direction add together, conditions are rougher. On which opposite side do they tend to partially cancel, making it more navigable? • Imagine sailing near the storm: if you stayed on the comparatively safer side, would you be to the left or right of its track (looking in the direction the storm is moving)?
• Be clear on clockwise vs. counterclockwise circulation in the Southern Hemisphere around a tropical storm • Visualize the storm’s track as an arrow and then decide which side has stronger combined winds and seas (dangerous) and which side is comparatively safer (navigable) • Confirm that you are thinking from the perspective of looking in the direction the storm is moving along its track, not from north or south on the map
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