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The 1981 Central Pacific Tropical Cyclone Season
GREG started as TD8E off the coast of Mexico near 16N 112W on August 13, 1981. The EPHC issued its first bulletin on TD8E at 130900Z and GREG was named as a tropical storm at 141800Z. GREG followed a westerly course for several days while maintaining tropical storm intensity.
As GREG approached 140W, it intensified and became a hurricane at 200600Z. Its life as a hurricane was short lived. GREG now moved under strong upper level southwesterlies and the resulting shearing action caused the storm to weaken rapidly. GREG was downgraded to tropical storm at 201800Z, just before crossing 140W. Forecast responsibility was passed to the CPHC at this time. The first advisory was issued at 210300Z. GREG continued to weaken and was downgraded to tropical depression at 211800Z. T.D. GREG maintained a well defined circulation for another 24 hours.
JOVA began as TD12E on September 14, 1981. The EPHC issued its first bulletin at 141200Z. TD12E intensified rapidly and became a tropical storm at 141800Z and a hurricane 24 hours later at 151800Z. From its birth to the time it reached hurricane intensity, JOVA moved in a westerly direction. Between 151800Z and 160000Z the storm commenced a more WNW track and reached its maximum intensity of 75 knots.
As JOVA approached 140W, it began to weaken and turned toward the west again. JOVA was downgraded to a tropical storm at 181200Z and passed to the CPHC as it crossed 140W near 19N. JOVA continued to weaken over the next 48 hours as it moved westward at 15 to 18 knots. As JOVA approached 150W, an upper level trough and a rapidly moving mid latitude low pressure system north of the Hawaiian Islands began to lend their influence to the storm's movement and JOVA began to move toward the west northwest. As a tropical storm, JOVA passed within 90 miles of the Island of Hawaii's North Coast at 201200Z. Six hours later JOVA was downgraded to a tropical depression and its center passed within 60 miles of the windward coasts of Maui, Molokai, and Oahu. During this period, the depression deteriorated rapidly and the final bulletin was issued at 210300Z.
There were no reports of damages or casualties to ships and the effects on the Hawaiian Islands' weather was minimal, actually resulting in a weakening of the trades and an increase in the humidity.