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
The Trough Long Knob (1,725 feet) flanks the Trough. Sawmill Ridge ends at the mouth of the Trough at the point where Sawmill Run descends the ridge and joins the river. The communities of Sector and Glebe are located here to the west and east, respectively. The concrete piers of the old bridge that once carried Fleming-Sector Road (County Route 8/3) connecting these two communities are still visible here as well. A typical Trough canoe run ends at the Harmison's Public Access Site below the old bridge and behind The Trough General Store. The Trough is a popular canoeing/kayaking venue, although not