Meteorological history Cyclone Bejisa

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map plotting track , intensity of storm, according saffir–simpson scale


in late december 2013, computer forecast models began predict development , cyclogenesis of disturbance within monsoon trough north of madagascar. @ 1800 utc on december 27, joint typhoon warning center (jtwc) noted discrete area of disturbed weather approximately 1,350 km (840 mi) north-northwest of réunion corresponded model forecasts , had potential develop. accompanied low-level circulation center, monitored storm complex developed rainbands southern periphery following day. @ 1200 utc on december 28, météo-france deemed system sufficiently organized considered tropical disturbance, fourth system given such classification agency season. upon designation, disturbance analyzed have unusually high barometric pressure, based on nearby weather station observations. météo-france projected system peak tropical cyclone before weakening , impacting mascarene islands.


tracking southward, disturbance steadily organized following december 28. result of wind shear, system s low-level circulation center remained partially exposed, though shearing conditions expected lessen @ 0000 utc on december 29, disturbance upgraded tropical depression. @ 1800 utc day, depression intensified moderate tropical storm intensity, receiving name bejisa mauritius meteorological services. coincided improving satellite appearance of storm s central dense overcast. intensification subsequently quickened, , @ 0600 utc next day bejisa considered severe tropical storm. concurrently strengthening ridge in mid-levels of troposphere began steer storm towards south-southeast. following development of small pinhole eye, bejisa upgraded tropical cyclone status @ 1200 utc on december 30, followed intense tropical cyclone status 6 hours thereafter, peak winds of 165 km/h (105 mph). in addition, jtwc estimated 1-minute winds of 195 km/h (120 mph), utilizing dvorak technique estimate intensity. agency noted decreasing wind shear, favorable outflow, , warm sea surface temperatures allowed intensification. @ time of peak winds, bejisa located 825 km (515 mi) north-northwest of réunion.



cyclone bejisa striking réunion on january 2


the intensification phase of bejisa short-lived, eyewall replacement cycle resulted in slight deterioration , fluctuation of storm s organization , structure. on december 31, system weakened below intense tropical cyclone status eye became less organized. when eyewall replacement cycle completed, eye became larger , winds increased. late on december 31, bejisa passed 125 km (75 mi) west of tromelin island. on next day, cyclone attained secondary peak intensity of 160 km/h (100 mph). however, increasing wind shear eroded eyewall, opened eyewall in northern periphery. despite météo-france assessing bejisa had weakened, @ same time jtwc estimated cyclone had intensified further reach peak 1-minute winds of 205 km/h (125 mph) on january 2. day, storm s center passed within 155 km (95 mi) of réunion while continuing southeast, , eyewall passed within 15 km (9 mi) of island. continued wind shear stripped convection, coupled cooler water temperatures, , on january 3, bejisa weakened below tropical cyclone status. time, ridge southeast turned storm southwest. slight decrease in wind shear expected allow convection rebuild on january 4, , storm strengthened slightly. january 5, bejisa began evolving post-tropical cyclone, weaker convection on center. day, météo-france reclassified bejisa post-tropical depression, noting radius of maximum winds had expanded. on same day, jtwc discontinued warnings after assessing storm had become subtropical cyclone. increasing wind shear displaced remaining convection west of center, , météo-france discontinued advisories on bejisa on january 6 after exposed turned more south. storm became extratropical , turned northeast, , last noted on january 7.








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