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2000 PRELIMINARY
REPORTS |
a. Synoptic HistoryThe genesis of Tropical Storm Nadine resulted from the interaction of a strong upper-level trough and a tropical wave. Water vapor imagery showed a distinct and nearly stationary upper-trough extending northeastward from the Leeward Islands across the Atlantic for several days. A cut-off low generated within the trough, moved southwestward, and interacted with a tropical wave that reached the area on 16 October. The system as a whole began to move slowly westward with increasing convection and on the 17th, a broad low to middle level circulation became apparent on visible images. However, it was not until the 19th, when the system became stationary, that ship reports indicated that a surface circulation had developed. It is estimated that a tropical depression formed about 600 nautical miles southeast of Bermuda at 1200 UTC 19 October. The depression moved slowly northward and then northeastward
around the periphery of the subtropical ridge and ahead of a cold front.
The thunderstorm activity became better organized with increasing outflow
while the shear relaxed. Based on satellite Dvorak intensity numbers,
it is estimated that the depression became Tropical Storm Nadine at 1200
UTC on the 20th. Nadine reached a peak intensity of 58 mph
and a minimum pressure of 999 mb at 0000 UTC on the 21st when
a possible eye-like feature and an impressive outflow were observed on
satellite imagery. Thereafter, the shear increased and convection began
to weaken. Nadine interacted with a frontal zone and became a weak extratropical
low at 0000 UTC 22 October while moving northeastward. It was then absorbed
by a much larger frontal low. b. Meteorological Statistics A report of 38 mph from the southeast from the vessel Prince
of Waves located just east of the cloud system center was used to
initiate tropical depression advisories. c. Casualty and Damage StatisticsNo casualties or damages were associated with Nadine.
Maximum
Intensity For Tropical Storm Nadine
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