Flight track depicts data from a British Airways flight data recorder. Ensembles are for East Asia and Southwest Asia for data taken at 0000 UTC on Thursdays from 09 January 1992 through 26 March 1992. Analyses have been interpolated vertically and horizontally to aircraft position. Flight tracks depict data from British Airways flight data recorders. Note that the core of the analyzed jet streak has advected eastward in contradiction to the aircraft data on 13 February 1992.
Wind direction is indicated as for a horizontal plot.
See left rectangle in Fig. Note the separation of the polar and subtropical jet streaks at the left and their merger at the center. The aircraft data indicates that the actual streaks remained separated. See also the map in Fig. 1 for depiction of exact geographical location.