Figure 1

(a) Tracks of typhoons from western Pacific into SCS through the Luzon Strait, from 1951–2013, updated from Sun and Oey1 using the latest IBTrACS observations. For each track, colors show 6-hourly wind speeds normalized by the maximum wind speed for that track; darkest brown color corresponds to normalized wind speeds >0.95, and indicates where and when the typhoon was near its LMI. Top left shows the total TCs into SCS (278), subdivided into those passing through the Luzon Strait (i.e. the LSTCs, 137), and south of the strait (141, tracks not shown). Red contours show mean absolute dynamic topography MADT (m) from AVISO http://www.aviso.oceanobs.com/. (b) The number of LMIs per 1o × 1o grid (normalized by the maximum number = 6), according to tracks in (a). Tracks within 50 km of the northern (southern) tip of Luzon (Taiwan) were excluded. Maps plotted using MATLAB Version#R2012a (7.14.0.739) 64-bit (glnxa64) (https://www.mathworks.com/support/sysreq/previous_releases.html).