In terms of bandpass filtered 500 hPa daily geopotential height data,the monthly mean strength and position of the storm tracks are defined,followed by analysis of the time-varying evolution of the tracks and the jet at the same level along with their relation. Resultsshow that the Pacific and Atlantic storm tracks have significant intermonthly variation intheir strength and northand southward location. They are weakest(strongest)in summer(winter),lying northward(southward)of normal position. In most cases,they are positionedbowartream and poleward of the cores of the jets. Also,breakdown is found both in the jetsand storm tracks, Interestingly,the storm track is sometimes bicored over the Pacific.