If neither of these agencies issued any warnings, no number will be given. Greek letter names were assigned to certain systems by the author for purposes of discussion in the monthly summaries. For Northwestern Pacific systems the central pressure estimates are taken from advisories issued by the Japanese Meteorological Agency.
Central pressure is given in millibars, which is numerically equivalent to hectopascals.
1-minute average sustained windspeed in knots. This does not always agree with JTWC's assessment. An estimate of the maximum 10-minute average sustained wind. These values are taken from either Japan's or Manila's warnings, whichever had the higher value. A separate table is given for each of the four Northern Hemisphere basins.