Danny becomes first hurricane of 2015 on path toward Caribbean

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Danny to Target Lesser Antilles Early Next Week


Danny become the first hurricane of the 2015 Atlantic season, prior to heading into the Caribbean.

The system became a tropical depression on Tuesday morning and a tropical storm Tuesday afternoon. Danny could maintain hurricane status into this weekend as it continues to move through generally favorable atmospheric conditions.

The system moved westward across Africa during the first part of August and was moving westward over the south-central Atlantic Ocean at 10-15 mph (15-25 kph) this week.

When a closed circulation near the sea surface has been confirmed, a tropical depression is born. When sustained winds around the circulation reach 39 mph (63 kph), a tropical depression is upgraded to a tropical storm. For a system to become a hurricane, sustained winds must reach 74 mph (119 kph).

Danny is currently about 1,200 miles east of Windward and Leeward islands just north of the equator.

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Danny follows Ana, Bill and Claudette from earlier this season. None of the first three storms reached hurricane status.

Much of the islands in the Caribbean Sea are in drought and would trade the inconvenience and hazards that a modest tropical storm would bring for rainfall. Even a poorly organized tropical depression or storm could bring an uptick in drenching showers and thunderstorms, provided the system tracks close by.

A general track to the west-northwest is most likely through this weekend, with Danny being guided along by the oval-shaped circulation of high pressure over the central Atlantic.

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Danny becomes first hurricane of 2015 on path toward Caribbean
AT SEA - OCTOBER 28: In this handout satellite image provided by National Oceanic and Atmospheric Administration (NOAA), Hurricane Sandy, pictured at 00:15 UTC, churns off the east coast on October 28, 2012 in the Atlantic Ocean. Sandy which has already claimed over 50 lives in the Caribbean is predicted to bring heavy winds and floodwaters to the mid-atlantic region. (Photo by NASA via Getty Images)

Hurricane Sandy at night, from space

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Hurricane Irene as Seen from Space

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IN SPACE - SEPTEMBER 11: In this handout satellite image provided by the National Oceanic and Atmospheric Administration (NOAA) and the National Aeronautics and Space Administration (NASA), hurricane Humberto (R) forms as a category one on September 11, 2013 in the far eastern Atlantic Ocean. Humberto is the first hurricane of the 2013 season. (Photo by NOAA/NASA GOES Project via Getty Images)
UNITED STATES - JULY 3: In this handout provided by the NASA, Hurricane Arthur is seen from the International Space Staion as it moves up the U.S. East Coast on July 3, 2014. According to reports, Arthur will continue to strengthen and will reach a category two in strength prior to landfall as early as the evening on July 3. (Photo by NASA via Getty Images)
CARIBBEAN SEA - AUGUST 24: In this handout MODIS satellite image provided by the NASA Goddard Space Flight Center, Hurricane Irene (top center) churns over the Bahamas on August 24, 2011 in the Caribbean Sea. Irene, now a Category 3 storm with winds of 120 miles per hour, is projected to possibly clip the Outer Banks region of North Carolina before moving up the eastern seaboard of the U.S. (Photo by NASA via Getty Images)

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IN SPACE - SEPTEMBER 10: In this handout image provided by NASA, Hurricane Ike is seen on September 10, 2008 from aboard the International Space Station (ISS). The center of the hurricane was near 23.8 degrees north latitude and 85.3 degrees west longitude, moving 300 degrees at 7 nautical miles per hour. The sustained winds were 80 nautical miles per hour with gusts to 100 nautical miles per hour and forecast to intensify, according to NASA. The eye of the hurricane is expected to make landfall at Galveston Island early Saturday (13 September 2008) morning. (Photo by NASA via Getty Images)

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UNITED STATES - JANUARY 17: This photo of Hurricane Frances was taken by NASA ISS Science Officer and Flight Engineer Mike Fincke aboard the International Space Station as he flew 230 miles above the storm at about 10 am EDT Friday, 27 August 2004. At the time, Frances was about 820 miles east of the Lesser Antilles in the Atlantic Ocean, moving west-northwest at 10 miles an hour, with maximum sustained winds of 105 miles an hour. (Photo by SSPL/Getty Images)

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Hurricane Danielle (NASA, International Space Station Science, 08/27/10) [Explored]

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On that track and present speed, Danny is expected to cross the Windward or Leeward islands during Monday. followed by other islands in the northern Caribbean through the middle of next week.

A curve to the northwest and fluctuation in strength are also possibilities with Danny.

Danny has some atmospheric parameters working for it and against it at this point.

Dry air just north of the storm will occasionally wrap in and result in fluctuation in strength and organization through the weekend. Too much dry air could wrap in and choke off the storm's moisture supply.

Waters along Danny's projected path are sufficiently warm to support further strengthening.

The tropical storm is currently passing through a zone where winds aloft are light, which favors development.

Strong winds aloft (wind shear) can prevent a tropical system from developing or cause an organized tropical system to weaken.

The winds aloft over Danny's path may strengthen next week.

According to AccuWeather Meteorologist Evan Duffey, wind shear has been strong over the Caribbean Sea during much of hurricane season thus far.

"The most likely time for Danny to strengthen is prior to crossing into the Caribbean, since beyond this point wind shear may be too hostile," Duffey said.

There are two other areas of concern in the Atlantic.

A significant area of disturbed weather is emerging off Africa.

"Steering winds favor a more northwest track with this system when compared to the existing tropical depression and potential impacts to land will likely be reduced, should it develop this weekend into next week," Duffey said.

A track into the central Atlantic, well away from land areas is most likely with the system near Africa.

Another system may develop near Bermuda over the next several days.

The feature near Bermuda may slowly form beneath a storm in the upper atmosphere. While a threat to the United States appears unlikely at this point, it could wander close to the Canada shoreline early next week.

During El Nino, the number of named tropical systems in the Atlantic basin tends to be lower than average.

AccuWeather is forecasting eight tropical storms, four hurricanes and one major hurricane for the 2015 season with two to three landfalls in the United States. Ana and Bill made landfall in the U.S. during May and June respectively.

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