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1st tropical depression of season forms far from land

1st tropical depression of season forms far from land

The first subtropical depression of the 2017 Atlantic hurricane season formed on Wednesday and became fully tropical Thursday.

Arlene had winds of 45 miles per hour, making it a minimal tropical storm. The official Atlantic hurricane season runs from June 1st through November 30th.

The system transitioned to a fully tropical one on Thursday with satellite imagery showing that it had developed a characteristic "warm core". "Unexpectedly, the subtropical cyclone became a tropical depression this morning, and then it intensified to a tropical storm".

In its last advisory on the system around midday, the National Hurricane Centre (NHC) in Miami said Arlene had merged with a large extratropical cyclone.

While a subtropical storm shares some features with the more familiar tropical systems, there are some key differences.

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This is the second year in a row with unusual early-season developments. That made Ana the only tropical storm on record to form in the Atlantic Basin in April.

Tropical Storm Arlene formed this afternoon from what was sub tropical depression #1, yesterday. The seasonal hurricane forecast from researchers at Colorado State University calls for a slightly less active than normal season, with 11 named storms, four hurricanes and two major hurricanes. Hurricane Alex formed in the north-central Atlantic in January of 2016.

The formation of these tropical or sub-tropical lows usually requires sea surface temperatures (SSTs) of at least 26.5C.

Can tropical systems influence the spread of the Zika virus?

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