Tropical storm Dolly forms in the Atlantic

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(Credit: US National Hurricane Center)

(CNN) - Subtropical depression four has strengthened and is now Tropical Storm Dolly, according to the National Hurricane Center.

Recent satellite data showed that winds have increased to 72 km / h with gusts of higher winds.

The wind field has shrunk and so Dolly is no longer a subtropical system.

Dolly is not expected to be a threat on land as it is expected to weaken slowly over the Atlantic in the coming days.

Tropical storm