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The tropical waves themselves weaken over land; however, they provide enhanced energy and a focus for convection to develop along the axis, even while over land, as a result of increase convergence (of the winds) at the surface. Couple this with instability derived from daytime heating (think sort of like the seabreeze, albeit maybe not quite the same effect) and ample moisture from the nearby bodies of water, and you have an increased likelihood for/strength to the convection over land. |