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Mark A. Lander and Charles P. Guard

1. Introduction This summary of 1997 western North Pacific, north Indian Ocean, and Southern Hemisphere tropical cyclones (TCs) was compiled from the archives of the Joint Typhoon Warning Center (JTWC), Guam ( JTWC 1997 ). The JTWC is a joint U.S. Navy–Air Force activity with a forecast area of responsibility that extends from 180° westward to the coast of Africa, north and south of the equator. Seventy percent of the world's TCs develop in this area. The Naval Pacific Meteorology and

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Mark A. Lander, Eric J. Trehubenko, and Charles P. Guard

detailed than are the summaries of TCs in the other basins. An extensive summary for the western North Pacific is found in section 2 , which is subdivided into three topics: (a) an overview of the annual statistics coupled with a discussion of the large-scale circulation, (b) a recap of the TC activity by month, and (c) short discussions of some selected TCs. Brief summaries for the North Indian Ocean and Southern Hemisphere are found in sections 3 and 4 . Concluding remarks appear in section 5

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Mark A. Lander and Michael D. Angove

for the North Indian Ocean (NIO) is found in section 3 , and a brief summary of the JTWC statistics for the Southern Hemisphere (SH) is found in section 4 . Concluding remarks are found in section 5 . 2. Western North Pacific tropical cyclones: January–December 1995 a. Annual statistics and the large-scale circulation The year of 1995 included five supertyphoons, nine lesser typhoons, 12 tropical storms, and eight tropicaldepressions ( Table 1 ). The calendar

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Richard J. Pasch, Eric S. Blake, Lixion A. Avila, John L. Beven, Daniel P. Brown, James L. Franklin, Richard D. Knabb, Michelle M. Mainelli, Jamie R. Rhome, and Stacy R. Stewart

15 August about 650 n mi south-southwest of the southern tip of Baja California. Moving west-northwestward to the south of a midlevel high pressure ridge that extended from northern Mexico westward into the northeastern Pacific Ocean, the depression quickly strengthened and became a tropical storm at 0000 UTC 16 August. Despite initially being in an environment of moderate north-northeasterly shear, Hector was able to steadily strengthen, and it reached hurricane status by 0600 UTC 17 August

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Lixion A. Avila and Jamie Rhome

over Central America soon thereafter. The southern portion of the wave emerged over the eastern Pacific Ocean on 23 September and continued to move westward over the next few days with showers and thunderstorms becoming more consolidated on 26 September. An area of low pressure developed along the wave axis around 1200 UTC 27 September, approximately 300 n mi southwest of Acapulco. Deep convection gradually became better organized near the low during the next day or so, and a tropical depression is

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Miles B. Lawrence

that site. As soon as the wave moved over the tropical Atlantic Ocean, it lost most of the convection and remained as a westward-moving weak synoptic feature for about 2 weeks. The wave crossed Central America during 6 and 7 July. On 8 July, a broad low-level circulation began to form south of the Gulf of Tehuantepec. It took three more days for the thunderstorms and the circulation to consolidate. It became a tropical depression near 0600 UTC 12 July, about 850 n mi south-southwest of the southern

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Lixion A. Avila and John L. Guiney

1. Introduction The most prominent characteristic of the 1998 eastern North Pacific hurricane season was the below-normal number of landfalling tropical cyclones. On average, three or four tropical cyclones strike the coast of Mexico each year but only two tropical cyclones made landfall during 1998. Hurricane Isis made two landfalls in Mexico, it passed over southern Baja California and then finally passed onshore near Los Mochis, where it claimed 14 lives. Weakening Tropical Depression Javier

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Lixion A. Avila, Richard J. Pasch, Jack L. Beven, James L. Franklin, Miles B. Lawrence, Stacy R. Stewart, and Jiann-Gwo Jiing

, although some showers redeveloped intermittently. f. Hurricane Flossie, 26 August–2 September Flossie originated from a tropical wave that moved across the west coast of Africa on 11 August and produced Tropical Storm Chantal over the tropical Atlantic. After Chantal made landfall near Chetumal, Mexico, the southern portion of the associated disturbance crossed Central America and emerged over the Pacific Ocean south of Guatemala on 21 August. For the next several days, the area of cloudiness and

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Miles B. Lawrence, Lixion A. Avila, Jack L. Beven, James L. Franklin, Richard J. Pasch, and Stacy R. Stewart

California and eroded the ridge located north of Aletta, creating very weak steering currents and resulting in a slow meandering motion for the remainder of the storm's existence. The combination of vertical shear and cooling ocean waters from upwelling under the quasi-stationary cyclone promoted continued weakening. Aletta dissipated on 28 May, about 400 n mi south-southeast of the southern tip of Baja California. A remnant swirl of low clouds and intermittent showers lingered in the area for several

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Max Mayfield and Edward N. Rappaport

received. The surface circulation dissipated on the 6th. g. Hurricane Fausto, 10–14 September The origin of Fausto can be traced using satellite imagery to an area of disturbed weather that was located over Venezuela on 31 August. It is possible that this disturbed weather was the southern part of a tropical wave that became Hurricane Fran over the Atlantic Ocean. The disturbed weather moved westward across Central America on 4 September and to a position centered about 375 km

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