Mohawk–Hudson convergence

The small convergence zone forms within specific weather conditions sometimes found in the wake of extratropical cyclones shifting east of the area.

With sufficient moisture in the lower atmosphere, a localized area of precipitation may form where the valleys meet, extending for several miles around Albany.

In early August 2008, two days of training thunderstorms over the Capital District were attributed to MHC; the result was locally heavy rain, amounting to over 1 in (25 mm).

A relatively rare variation of MHC, termed "Southern Mohawk–Hudson convergence" (SMHC), occurs in the summer, when a southwesterly wind is present in advance of an approaching cold front.

Whereas the effects of the convergence zone are generally insignificant in the winter, SMHC presents more of a forecasting challenge when thunderstorms rapidly develop threaten and to impede travel at Albany International Airport.