WESTERN PACIFIC · 1987 SEASON
Typhoon Betty (1987)
Recorded track and intensity · 7 Aug 1987–17 Aug 1987
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Wind speed & pressure
11 Aug, 12:00 UTCForward speed & ACE
11 Aug, 12:00 UTCHover or tap either graph to follow the track. The slider controls both graphs. Each line uses its matching colored axis.
Forward speed measures the center’s motion. ACE accumulates squared one-minute winds at 00, 06, 12 and 18 UTC during tropical or subtropical stages at 34 kt or above. Missing observations make ACE partial. Missing measurements remain gaps.
161 mph / 259 km/h
11 Aug 1987 · tropical stage
Full archive record, including non-tropical stages if present
Along the recorded center positions
STORM HISTORY
Track and intensity summary
Betty is listed in the Western Pacific basin for the 1987 season. Its archived track begins on 7 Aug 1987, 00:00 UTC at 8.4°N, 134.2°E. The first observation lists sustained winds of 20 knots. These dates describe the available observations, which may include stages before and after the tropical cyclone phase.
The first Category 5 observation appears on 11 Aug 1987, 12:00 UTC. The highest recorded tropical-stage one-minute sustained wind is 140 knots (161 mph / 259 km/h), first recorded on 11 Aug 1987, 12:00 UTC at 12.2°N, 127.6°E. The minimum recorded tropical-stage central pressure is 890 hPa on 11 Aug 1987, 12:00 UTC.
The full record spans 252 hours and approximately 4,100 kilometers along the recorded center positions. The last recorded position is 18.8°N, 99.3°E on 17 Aug 1987, 12:00 UTC.
This summary is calculated from the NOAA IBTrACS archive. Category 5 describes the storm’s peak recorded wind intensity, not its intensity at landfall or the severity of impacts at any location. Landfall times, damage and casualties have not been independently reviewed for this page.
METHODOLOGY
Data sources and limitations
The map and summary are generated from NOAA’s IBTrACS v04r01 archive. Wind and category use US-agency records; minimum pressure is calculated during the tropical stage, with the archive’s pressure source retained. Category 5 refers to the Saffir–Simpson one-minute wind scale; local agencies may use different classifications. Coastlines use Natural Earth’s 1:10m land data.
Track distance adds great-circle distances between consecutive observations, excluding gaps over 12 hours. This track has no gaps over 12 hours. The line shows the storm’s center, not its size, rainfall or flood extent. Converted wind speeds are rounded to the nearest whole unit.
Archive retrieved
NOAA IBTrACS archive · Field documentation
Sources & methodology