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Dry Air Caused Tropical Storm Jerry’s Demise

October 18, 2013
Image Caption: Visible image of Tropical Storm Jerry from NOAA's GOES-East satellite on Oct. 2. Credit: NRL/NOAA

NASA

Dry air wrapping around Tropical Storm Jerry wiped out the storm’s moisture and prevented thunderstorm development to keep the storm going, “wrapping up” the storm and sending it into weather history.

At 11 a.m. EDT on Oct 2 Tropical Storm Jerry’s maximum sustained winds were near 40 mph/65 kph. It was centered near latitude 28.2 north and longitude 43.9 west.  Jerry was nearly stationary but was expected to move to the north-northeast and turn east-northeast. Satellite data indicated that Jerry was a small tropical storm with tropical-storm-force winds only extending 45 miles/75 km from the center.

By Oct. 3 at 5 a.m. EDT, dry air had wrapped around Tropical Storm Jerry, removing its moisture and fuel for thunderstorms, weakening it to a depression. The maximum sustained winds dropped to 35 mph/55 kph, and further weakening was expected because of the dry air. At that time, Jerry was centered near 30.2 north and 41.4 west, in the Central North Atlantic Ocean. It was moving northeast.

Jerry weakened to a remnant low pressure area by Oct. 4. At 8:05 a.m. EDT, The National Hurricane Center noted that the remnant 1008 millibar low of Jerry was located near 32 north and 37 west. The widely scattered showers and isolated thunderstorms associated with the remnants were occurring east of the center.  Jerry’s remnants dissipated in the days following.

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Source: Rob Gutro, NASA's Goddard Space Flight Center



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