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Tropical Storm Chantal Fading in North Atlantic

Tropical Storm Chantal didn't stick around the U.S. east coast very long. It developed on Monday night, July 30, and by Tuesday afternoon, August 1, it was in the northern Atlantic Ocean, headed toward Iceland.

At 1630 UTC (12:30 p.m. EDT) on Wednesday, August 1, Chantal still had maximum sustained winds of 45 knots with gusts to 55 knots, as she sped to the northeast in the north Atlantic Ocean at 35 knots (40 mph). She has become extratropical, which means she lost her tropical characteristics. This usually happens once a system moves from mid latitudes to high latitudes and changes from a "warm core" to a "cold core" system. At that time, she was located near 46 degrees north and 54 degrees west, and had an estimated minimum central pressure of 992 millibars.


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This image of Tropical Storm Chantal depicts wind speed in color and wind direction with small barbs. White barbs point to areas of heavy rain. The highest wind speeds, are shown in purple. The data were obtained by NASA’s QuikSCAT satellite on August 1, 2007, as it was just south of Newfoundland, Canada.

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Tropical Storm Chantal Speeding Away from the U.S. East Coast


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The third tropical depression of the Atlantic hurricane season formed around 11:00 p.m. EDT on Monday, July 30 west of Bermuda. Exactly 12 hours later on Tuesday, July 31, at 11:00 a.m. EDT, the storm strengthened into a tropical storm with sustained winds of 40 mph and higher gusts. At that time, the storm was named Tropical Storm Chantal. Chantal was located near latitude 40.2 north and longitude 62.7 west, about 330 miles (530 km) south of Halifax, Nova Scotia and is moving rapidly toward the northeast near 23 mph (37 km/hr). Chantal is not a threat to the United States.

Estimated minimum central pressure is 999 millibars, down from 1007 millibars just five hours before on July 31. A drop in pressure is a sign of strengthening.

Chantal is the cluster of clouds off the U.S. east coast in the top right side of this satellite image. This image was created with data from the Geostationary Operational Environmental Satellite (GOES-12), on July 31 at 14:30 UTC (10:30 a.m. EDT). GOES-12 is operated by the National Oceanic and Atmospheric Administration. This image was created by NASA's GOES Project Science Office at NASA's Goddard Space Flight Center, Greenbelt, Md.

What do the Forecast Models Show?

The National Hurricane Center forecast discussion notes that Chantal is quickly moving into cooler waters, and little additional intensification is expected. Global computer models suggest that Chantal will become the main part of a large powerful low over the northern Atlantic Ocean and a little additional strengthening is shown in a couple days.

Another Atlantic Storm Brewing

Elsewhere, forecasters are eyeing an area of low pressure is centered about 700 miles east of the southern windward islands. This system shows some signs of organization...and it has the potential to become a tropical depression in the next couple of days as it moves westward around 15 mph. Credits: Image - NASA GOES Project/NOAA;Summary - Rob Gutro (derived from NHS reports) Goddard Space Flight Center

Rob Gutro
NASA Goddard Space Flight Center