Tuesday, October 22, 2013

Tropical Storm Lorenzo (2013)

Storm Active: October 21-24

On October 20, a low pressure center formed along a trough over the central Atlantic ocean and thunderstorms began to concentrate about it. By the next day, a surface circulation was developing, and the system was designated Tropical Depression Thirteen that evening. The cyclone was already moving northeastward at the time of formation, and continued to move out into the open waters of the Atlantic.

Overnight and into the morning of October 22, Thirteen became more organized as convection continued to increase in the relatively friendly atmospheric environment. Soon, the cyclone had developed a symmetric dense overcast, and thus strengthened into Tropical Storm Lorenzo. The storm's organization increased further that morning, bringing Lorenzo to its peak intensity of 50 mph winds and a pressure of 1003 mb. By this time, the system was moving toward the east, having navigated around the upper edge of a mid-level ridge.

Lorenzo maintained its intensity until October 23, when shear increased substantially out of the northwest and decoupled the surface and mid-level circulations of the system and displaced convection from the cyclone's eastern side. Before long, all thunderstorm activity had been obliterated by the blast of wind shear, and Lorenzo was downgraded to a tropical depression that night. During the morning of October 24, the system degenerated into a remnant low. The low dissipated a few days later.

The above image shows Lorenzo near its peak intensity.

Lorenzo was a short-lived tropical storm, and did not affect land.

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