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Tropical Storm Fern (1996)
Severe Tropical Storm Fern was a damaging storm that struck Yap in the 1996 Pacific typhoon season. A tropical depression formed on December 21, when a low-level circulation center began to produce deep convection. The depression strengthened into a tropical storm the next day, and was given the name ''Fern'' by the Joint Typhoon Warning Center (JTWC). The storm slowly intensified into a Category 1 typhoon on the Saffir–Simpson hurricane wind scale, according to JTWC. Fern peaked north of Yap on December 26, with JTWC assessing winds of 150 km/h (90 mph), while the Regional Specialized Meteorological Center, Japan Meteorological Agency (JMA) assessed peak winds of , just below typhoon strength. The storm soon became sheared and weakened slowly. Fern continued to weaken to a tropical depression on December 30. Both agencies stopped advisories later on the same day.
Fern made a direct hit at Yap on Christmas Day. A cargo ship was abandoned after it was damaged by high winds offshore. On the island, Fern caused $3 million (1996 USD) of damage. Roads and bridges were significantly damaged, and other public facilities were destroyed. Crops and private properties also received damage. A state of emergency was declared in Yap State two weeks later, and became a disaster area two months later.
==Meteorological history==
In the middle of December, twin monsoon troughs were established in the extreme western Pacific Ocean, which will later spawn storms Greg, and Fern itself in the northern hemisphere. The trough in the southern hemisphere spawned cyclones Ophelia, Phil, and Fergus. Around that time, convection began to increase near the equator, and was associated with a westerly wind burst. A low level circulation center was noted by JTWC on December 19 at 0600 UTC. Two days later, convection consolidated near the circulation center,〔 and JMA began tracking it at 0000 UTC as a tropical depression. JTWC issued a Tropical Cyclone Formation Alert at 1500 UTC, as sea level pressure began to deepen, and signs of upper level divergence were found in the system. The first advisory for Tropical Depression 42W followed three hours later, on December 17 at 1200 UTC.〔〔 JTWC upgraded the depression to a tropical storm on December 22 at 0000 UTC as it traveled westerly, and was given the name ''Fern''.〔 According to JTWC, the wind speeds meandered at minimal tropical storm strength.〔〔(【引用サイトリンク】url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/1996/1996s-bwp/bwp421996.txt )〕 JMA proceeded to upgrade the depression into a tropical storm at 1800 UTC, with winds of , and a pressure reading of .〔 On Christmas Eve, Fern slowly traveled toward Yap.〔 The storm passed over Yap the next day, strengthening to at 0000 UTC, according to JTWC. 〔 JMA assessed Fern had winds of at the same time.〔 Fern also began its recurvature that day, beginning its turn north.〔
Eighteen hours later on Christmas Day, JTWC upgraded Fern to a typhoon, with winds of .〔〔 JMA continued to keep it as a severe tropical storm at that time.〔 On December 26 at 1200 UTC, Fern reached its peak at 150 km/h (90 mph) north of Yap after its recurvature, according to JTWC.〔〔 JMA assessed that Fern reached its peak of , with a pressure reading of twelve hours later.〔 On December 28, Fern began to weaken when it encountered a shear line.〔 On the next day, JTWC downgraded Fern back to tropical storm strength, with winds of .〔 At the same time according to JMA, the storm had weakened to , with a pressure reading of .〔 Both warning centers downgraded Fern into a tropical depression by December 30, as it continued to travel along a shear line.〔〔〔 JTWC issued the final warning at 0600 UTC,〔 while JMA stopped tracking the depression at 1200 UTC.〔 JTWC continued to track the low until December 31, where it stalled north of Guam.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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