MIAMI (AP/WFLA) — Hurricane Sam is a Category 4 storm, but forecasters say the system could fluctuate in strength over the next day or so.

According to the National Hurricane Center, Sam is located about 850 miles east-southeast of the northern Leeward Islands. It is moving northwest at about 7 mph.

Forecasters say Sam has top winds around 145 miles per hour, making it a Category 4 hurricane. Wind speeds are expected to vary in intensity over the next day or so, followed by some slow weakening.

Hurricane Sam could cause dangerous rip current conditions off the coast of the Lesser Antilles early this week.

There are no current watches or warnings in effect for the storm.