Update | Hurricane Beryl strengthens into a Category 4 storm as it nears the southeast Caribbean

SAN JUAN, Puerto Rico (AP) — Hurricane Beryl strengthened into what experts called an "extremely dangerous" Category 4 storm as it approaches the southeast Caribbean, which began shutting down Sunday amid urgent pleas from government officials for people to take shelter.

Hurricane warnings were in effect for Barbados, St Lucia, Grenada, and St Vincent and the Grenadines.

Beryl's centre is expected to pass about 70 miles (112 kilometres) south of Barbados on Monday morning, said Sabu Best, director of Barbados' meteorological service.

"This is a very serious situation developing for the Windward Islands," warned the National Hurricane Center in Miami, which said that Beryl was "forecast to bring life-threatening winds and storm surge."

Beryl was located about 335 miles (570 kilometres) east-southeast of Barbados. It had maximum sustained winds of 130 mph (215 kph) and was moving west at 21 mph (33 kph). It is a compact storm, with hurricane-force winds extending 15 miles (30 kilometres) from its centre.

Beryl is expected to pass just south of Barbados early Monday and then head into the Caribbean Sea as a major hurricane on a path toward Jamaica. It is expected to weaken by midweek, but still remain a hurricane as it heads toward Mexico.

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