Abstract: The results of an objective climatology of 500hPa trough merger (defined as the amalgamation of two initially separate vorticity maxima) and trough fracture (defined as the splitting of a single vorticity center into two ...

Abstract: The passage of Tropical Storm Agnes through the eastern United States on 21?23 June 1972 was marked by a swath of exceptionally heavy rainfall amounting to 15?35 cm. The heaviest rains fell in a narrow band from eastern ...