Al-anon's man group in Virum

Upper level aspects of major east coast snowstorms (storms that produce a significant sized area of 10” or greater snowfall • large increases in amplitudes between trough and downstream ridge accompanied cyclogenesis • all cases exhibited decrease in half-wavelength indicative of self-development process (increasing vorticity) • diffluence and negative tilt seen in nearly all cases • phasing of multiple vorticity maxima observed in about half the cases • heavy snow usually falls as a vorticity max moves eastnortheast. heaviest snows fell north of the vorticity track • trough or upper-level cyclone was usually located over eastern Canada – this provides confluence over Northeast allowing high pressure to build From Kocin and Uccellini, 1990