Abstract
A family of mesoscale distur b ances was observed in the vicinity of the cold vortex aloft which passed over the Japan Sea coastal region on January 16,1965. A detailed subjective mesoanalysis of them was made by MATSUMOTO et al. (1967 a).
In the present paper, an objective surface analysis is made for one of the mesoscale disturbances in order to reexamine the results of the subjective analysis. The obtained mesoscale pressure and the wind fields in the present study coincide well with those of the subjective analysis. The phase difference between the pressure and the divergence fields suggests that the disturbance possesses the characteristics of a gravity wave. It is also shown from the evaluation of the divegence equation that (∂D/∂t+ V⋅∇D) is primarily balanced with 1/ρ∇2p.
