Monsoon trough of the summertime Asian monsoon is in its normal orientation (oriented east-southeast to west-northwest), tropical cyclones along its periphery will move with a westward motion. If it reverses its orientation, orienting southwest to northeast, tropical cyclones will move more poleward. Tropical cyclone tracks with S-shapes tend to be associated with reverse-oriented monsoon troughs. The South Pacific convergence zone and South American convergence zones are generally reverse oriented. The failure of the monsoon trough, or the ITCZ, to move south of the equator in the eastern Pacific Ocean and Atlantic Ocean during the southern hemisphere summer, is considered one of the
Rockall often given as 8 July 1810, when a Royal Navy officer named Basil Hall led a small landing party from the frigate to the summit. However, research by James Fisher of the landing (see below), in the log of the Endymion and elsewhere, indicates that the actual date for this first landing was on Sunday 8 September 1811. The landing party left the "Endymion" for the rock by boat. Whilst there, the "Endymion", which was taking depth measurements around Rockall, lost visual contact with the rock as a haze descended. The ship drifted away, leaving the landing party stranded. The