A case study of the rainfall associated with Typhoon Vera (the Ise Bay Typhoon) in 1959 is made. From an inspection of hourly precipitation charts, one gets an imprestion that the rainfall amount with the typhoon is solely dependent upon the orographic elect.However, the analysis of time changes of rainfall intensity reveals the existence of well-organized zones of alternating heavy and weak rainfall intensity surrounding the storm center. The surface pressure field also contains similar banded structure.A comparison with the radar pictures shows the correspondence of these zones to groups of radar rain bands.

In the present notes, the equation, i.e.,

A detailed comparison is made between the rainfall distribution over land at intervals of 20 minutes and the radar echoes which were associated with Typhoon Vera in September 1959. Even at this short time scale, the association of the isohyet pattern with the radar echo distribution is not easily seen because the rainfall amount is very much enhanced in the mountain range and the orographic rain is not well detected by radars. An analysis of time changes of the 20-min rainfall amount reveals the existence of zones of strong rainfall intensity corresponding to radar rain bands. It is found that not only the rainfall amount but also its variability with time are dependent upon the elevation of rain-gauge stations. This suggests a mutual interaction between the orographic rain and the convection associated with the typhoon rain bands.