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Jerry (Atlantic Ocean)
October 18, 2013

Dry Air Caused Tropical Storm Jerry to "Wrap it up"  [image-92]

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.

Text credit: Rob Gutro
NASA's Goddard Space Flight Center

Sept. 30, 2013 - NASA's TRMM Satellite Examines Atlantic's Tropical Storm Jerry [image-51][image-78]

Tropical Depression 11 formed in the central Atlantic Ocean and NASA's TRMM satellite passed overhead and gathered information  and identified a "hot tower" that indicated it would strengthen. The depression became Tropical Storm Jerry on Sept. 30 at 10:30 a.m. EDT.

The eleventh Atlantic tropical depression formed around 11 p.m. EDT on Saturday, Sept. 28, about 960 miles/1,540 km east-northeast of the Leeward Islands and was moving north at 9 mph.

When NASA's TRMM or Tropical Rainfall Measuring Mission satellite flew over Tropical Depression 11 on Sept. 30 at 09:28 UTC/5:28 a.m. EDT. TRMM observed a "hot tower" or towering thunderstorm near the center of circulation, where the cloud top exceeded 16 km/9.9 miles high. Rainfall in that storm was also falling at a rate of over 2 inches/50 mm per hour.

A "hot tower" is a tall cumulonimbus cloud that reaches at least to the top of the troposphere, the lowest layer of the atmosphere. It extends approximately nine miles (14.5 km) high in the tropics. The hot towers in Tropical Depression 11 were reaching heights of 16 km/9.9 miles high around the depression's center. These towers are called "hot" because they rise to such altitude due to the large amount of latent heat. Water vapor releases this latent heat as it condenses into liquid. NASA research shows that a tropical cyclone with a hot tower in its eye wall was twice as likely to intensify within six or more hours, than a cyclone that lacked a hot tower. Those hot towers also drop heavy rainfall.

By 10:30 a.m. EDT just 5 hours after NASA's TRMM satellite spotted the "hot tower" in Tropical Depression 11, it strengthened into Tropical Storm Jerry. Jerry had maximum sustained winds near 40 mph/65 kph. It was moving to the east at 7 mph/11 kph and is expected to move slowly and erratically over the next several days. Jerry was centered about 1,200 miles/1,935 km east-southeast of Bermuda. It had a minimum central pressure of 1008 millibars.

The National Hurricane Center expects that Jerry will experience some strengthening over the next day or two. For addition forecast updates, visit the National Hurricane Center website at: www.nhc.noaa.gov.

Text credit:  Rob Gutro
NASA's Goddard  Space Flight Center

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TD11 before it strengthened into Jerry
NASA's TRMM satellite flew over Tropical Depression 11 on Sept. 30 at 5:28 a.m. EDT and saw a "hot tower"near the center (red) that indicated the storm was strengthening into Tropical Storm Jerry.
Image Credit: 
NASA/SSAI, Hal Pierce
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NASA's TRMM satellite flew over Tropical Storm Jerry on Sept. 30 at 6:29 a.m. EDT when it was a depression, and spotted heavy rainfall at150 mm/hr from some storms, and cloud tops above 16km (~9.9 miles).
Image Credit: 
NASA/SSAI, Hal Pierce
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Tropical Storm Jerry
Visible image of Tropical Storm Jerry from NOAA's GOES-East satellite on Oct. 2.
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Page Last Updated: October 18th, 2013
Page Editor: Lynn Jenner