(Bloomberg) -- Record-breaking Hurricane Beryl came ashore on Carriacou Island with house-wrecking winds as it keeps growing stronger, plowing through the Caribbean with the threat of $1 billion in damages.

Beryl’s winds reached 150 miles (241 kilometers) per hour as it came ashore at 11:10 a.m. New York time on Carriacou, the second largest of Grenada’s islands, the US National Hurricane Center said. A Category 4 hurricane, Beryl is just 7 mph below the threshold for becoming a Category 5 storm at the top of the five-step Saffir-Simpson scale. 

“Residents in Grenada, the Grenadine Islands and Carriacou Island should not leave their shelter as winds will rapidly increase within the eyewall of Beryl,” Brad Reinhart, a senior hurricane specialist at the center, wrote in a forecast. “Remain in place through the passage of these life-threatening conditions and do not venture out in the eye of the storm.”

The storm rapidly intensified from a tropical depression Friday to a major Category 4 hurricane Sunday night before temporarily losing some power as it spun toward the Windward Islands. Beryl, a looming humanitarian disaster, became the earliest Category 4 storm in the Atlantic, said Alex DaSilva, lead hurricane forecaster at AccuWeather Inc. 

“It is exceptionally rare,” DaSilva said. “There has never been a Category 4 anywhere in the Atlantic in the month of June.” 

Grenada Prime Minister Dickon Mitchell and St. Vincent and the Grenadines Prime Minister Ralph Gonsalves both declared emergencies.

“This will be a difficult time, it will be a trying time,” Mitchell said. “We implore everyone in the path of this hurricane to take all necessary protective measures.” 

Damages on Grenada may reach $600 million, or 50% of the nation’s gross domestic product, said Chuck Watson, a disaster modeler with Enki Research. Across the Caribbean, damages may reach $1 billion.

Running Ahead of Pace

Typically the first hurricane arrives in the Atlantic by August 11 and the first major storm — Category 3 or stronger on the Saffir-Simpson scale — comes by September 1, the hurricane center said. With three storms already in the books, the season itself is also running ahead of the pace usually seen by August 3, which is in line with pre-season forecasts that called for it to be an active year. 

The Atlantic between the Caribbean and Africa is the warmest it has ever been during June and temperatures there are closer to what would be expected in August and September, when hurricane season peaks, DaSilva said. 

“That is why we saw such explosive development with that storm,” DaSilva said. 

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An early start to the storm season portends future disasters, and the hurricane center is already tracking what may be the season’s next storm after Beryl. 

After Beryl cuts through the Windward Islands it will enter the central Caribbean, where it’s predicted to remain a hurricane, according to the hurricane center. The Dominican Republic, Haiti and Jamaica, along with Mexico, Belize and Honduras, are all threatened by Beryl as it moves west, the center said. It will likely make landfall in Mexico or Belize Friday.

An area of high pressure raising temperatures into the 90s F (30s C) in New Orleans means Beryl will likely stay far south of the US Gulf Coast.

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Meanwhile, Tropical Storm Chris which came ashore in Mexico, has dissipated in the mountains.

In addition, trailing Beryl is a potential third storm that is forecast to grow in strength during the coming week. Beryl’s path through the Atlantic will likely rob this storm of warm water, so it probably won’t be as powerful, DaSilva said.

Before the six-month season started June 1, forecasters were already predicting the Atlantic would produce upwards of 20 storms, when an average year churns out 14. 

--With assistance from Jim Wyss.

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