Doldrums Doldrums The doldrums is a colloquial expression derived from historical maritime usage, which refers to those parts of the Atlantic Ocean and the Pacific Ocean affected by a low-pressure area around the equator where the prevailing winds are calm. The doldrums are also noted for calm periods when the winds disappear altogether, trapping sailing ships for periods of days or weeks. The term appears to have arisen in the eighteenth century, when trans-equator sailing voyages became more common. Since this zone is where two trade winds meet, it is also called the Intertropical Convergence Zone. They roughly lie between latitudes
Mohawk–Hudson convergence Mohawk–Hudson convergence Mohawk–Hudson convergence (MHC) is a mesoscale meteorology phenomenon occurring over the Capital District region of upstate New York, United States. The small convergence zone forms within specific weather conditions sometimes found in the wake of extratropical cyclones shifting east of the area. Given air pressure decreasing with both longitude and latitude, as well as weak synoptic low-level flow, winds are channeled east along the Mohawk Valley and south through the Hudson Valley, converging over Albany. With sufficient moisture in the lower atmosphere, a localized area of precipitation may form where the valleys meet, extending for several miles around