Circulation is audited by the Audit Bureau of Circulations (ABC). Tropical cyclones can form when smaller circulations within the Intertropical Convergence Zone merge. Large-scale thermal lows over continents help create pressure gradients that drive monsoon circulations. The large-scale thermal lows over continents help create pressure gradients which drive monsoon circulations. Large-scale thermal lows over continents help drive monsoon circulations. Within the tropics, thermal low circulations over terrain and high plateaus can drive monsoon circulations. Cyclogenesis is the development and strengthening of cyclonic circulations, or low-pressure areas, within the atmosphere. Shear funnels might also occur with weak transient circulations at the cloud base of thunderstorms. Sea surface temperatures too decreased by , triggering changes in the ocean circulations. Only newspapers with circulations of more than 100,000 copies in January 2009 are listed. Only newspapers with circulations of more than 100,000 copies in January 2010 are listed. The seasonal wind reversals would affect trade circulations. "Newsday" has one of the largest circulations of all U.S. daily newspapers. The atmospheric water cycle and the Walker and Hadley circulations were weaker as well. East Africa is also under the influence of monsoon circulations.