Mohawk–Hudson convergence

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Land relief map showing the convergence of the Mohawk (west–east) and Hudson (north–south) River Valleys

Mohawk–Hudson convergence (MHC) is a relatively rare mesoscale meteorology phenomenon occurring over the Capital District region of upstate New York, United States. The small convergence zone forms under specific weather conditions sometimes found in the wake of significant non-tropical cyclones passing east of the area. Surface air pressure decreasing with both longitude and latitude, and weak synoptic low-level flow, allow surface winds to blow east along the Mohawk Valley and south along the Hudson Valley, converging near or over Albany. Given sufficient moisture in the lower atmosphere and a lack of other, more dominant mechanisms to force ascent of air parcels, a localized area of precipitation may form where the valleys meet.

MHC-induced precipitation occurs predominately in the winter. It is typically manifested in light, inconsequential snowfall, often locally prolonging much larger snow events by several hours. MHC is difficult to forecast with confidence and has not been studied in depth.

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