Caribbean Sea and first landfall Meteorological history of Hurricane Dean

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hurricane dean category 4 storm on august 20 @ approximately 1841 utc, 14 hours before landfall


on morning of august 19, storm remained weakened peak strength. category 4 hurricane wind speeds between 140 mph (220 km/h) , 145 mph (230 km/h), center of hurricane dean passed 90 mi (150 km) south of haiti, , evening passed 25 mi (40 km) south of jamaica. 2 weather stations on island of jamaica, 1 @ ingleside , other @ morant bay, both reported in excess of 13 in (33 cm) of rainfall. in contrast, weather station @ les cayes, haiti recorded 1.18 in (3 cm) of rainfall.



hurricane dean intensified through night of august 19 , reinforced completed eyewall replacement cycle forming tight single-walled eye. @ 0100 utc august 20, storm passed 120 mi (190 km) south of sea buoy 42056, recorded significant wave height of 36 ft (11 m). concentric eyewall briefly observed again on morning of august 20, did not last long. in conditions of low wind shear, hurricane dean moved westward on waters increasingly high heat content, , storm exhibited classic upper-tropospheric outflow pattern. high pressure system on southeastern united states continued steer storm west towards yucatán peninsula. eyewall became better defined throughout day. cloud tops cooled, minimum central pressure fell, , winds increased 160 mph (260 km/h), making hurricane dean category 5 hurricane once again. time, less 210 mi (335 km) first landfall.


although many of convective bands located on yucatán peninsula, hurricane dean continued intensify until eye made landfall. eye moved on mexico near town of majahual in costa maya area, nhc estimated surface level winds of 175 mph (280 km/h), making dean first storm make landfall category 5 hurricane in atlantic basin since hurricane andrew in 1992. @ same time, dropsonde reading hurricane s eye estimated central pressure of 905 mbar, making dean third intense landfalling atlantic storm in history (after labor day hurricane of 1935 , hurricane gilbert of 1988) , tying dean camille , mitch seventh intense hurricane ever recorded in atlantic basin. landfall occurred in sparsely populated area of costa maya region of mexican state of quintana roo near 18.7 n 87.8 w @ 0900 utc august 21 , brought storm surge of 12–18 ft (3.7–5.5 m). weather station @ chetumal (the capital of quintana roo, mexico) reported 6.65 in (17 cm) of rainfall during hurricane dean s landfall. expected, landfall caused significant weakening of storm; eye filled , cold cloud-tops warmed. land severely disrupted storm s organization, , time dean crossed yucatán peninsula had weakened category 1 hurricane.









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