Miami: Tropical Storm 'Arthur' formed off the coast of Florida on Saturday (May 17, 2020), making it the sixth straight year for a named storm to develop before the official June 1 start of the Atlantic hurricane season. The US National Hurricane Center in Miami issued a tropical storm warning for North Carolina's Outer Banks in its 5 AM Sunday advisory. 


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At that time, the storm's center was located about 380 miles (610 kilometers) south-southwest of Cape Hatteras, North Carolina. 


Arthur had top sustained winds of 40 mph (65 kph) and was moving to the north-northeast at 9 mph (14 kph), slowing slightly from 13 mph (20 kph).


Forecasts say Arthur will stay well offshore of Florida, Georgia, and South Carolina on Sunday and then approach the North Carolina coast on Monday, where it will drop 1-3 inches of rain Sunday night and Monday.


The tropical storm warning was issued for parts of North Carolina's coast, from Surf City to Duck, including Pamlico and Albemarle Sounds.


Dangerous coastal surf conditions and rip currents are expected to spread northward from Florida to the mid-Atlantic states during the next few days.


While there may be a component of warming waters and climate change in other pre-June storms, Arthur is more of a subtropical storm system than a traditional named storm and its water is cooler than what's usually needed for storm formation, said Colorado State University hurricane researcher Phil Klotzbach.


A lot of these out-of-season storms are weak fleeting ones that meteorologists can see now because of satellites and better technology and would have been missed in earlier times, Klotzbach said. Like most earlier-than-usual storms, Arthur is likely to remain offshore, but could come relatively close to North Carolina's coast Monday, Klotzbach said.


Hurricane season officially starts June 1.


Local forecasters in the Bahamas said showers have lingered over the islands of Grand Bahama and Abaco, which are still struggling to recover after being hit by a Category 5 hurricane last year.


However, no flooding has been reported as the depression swirls just northwest of the archipelago and is expected to head into the open ocean as it strengthens.


Officials said they were prepared to evacuate patients currently housed in tents in Grand Bahama after Hurricane Dorian damaged the island's hospital, but forecasters said the bulk of thunderstorms are located north and east of the depression and are not expected to affect the region.