Tuesday, August 28, 2007




Riding the ITCZ - Tropical weather - it's a HOT topic!!

The ITCZ (Inter-Tropical Convergence Zone) is the boundary in the tropical Atlantic where the northeasterly trade winds of the North Atlantic meet or converge with the southeasterly trade winds of the South Atlantic.
It can be either a broad or narrow area of unstable weather often with moderate to strong convection activity. These unstable conditions are caused by the surface winds rising to the mid and upper atmospheric levels as they converge.
During the hurricane season, the ITCZ is usually located between 9 degrees North and 12 degrees North. During August and September the ITCZ often affects the Trinidad and Tobago area (10 degrees North).
As part of Eric's weather report each morning the position of the ITCZ is given as it requires careful monitoring, not only as to its proximity to tropical waves, but also for its location in relation to Trinidad because of the strong storm cells it often contains.
If a tropical wave with strong convection activity at both lower and mid level altitudes interacts with the ITCZ, the ITCZ, with northeast trade winds to the north and southeast trade winds to the south, tends to act as a catalyst and causes the wave to begin to spin and trigger the formation of a circulatory system. The process is aided by the anti-clockwise rotation force imparted by the "coriolis effect" in the Northern Hemisphere.

No comments: