Tropical systems are capable of becoming much stronger than higher latitude storms called cyclones because tropical cyclones convert warm ocean water into energy which strengthens the warm core in a hurricanes eye.
The National Hurricane Center's latest briefing said its maximum sustained winds have increased to almost 85 miles per hour with higher gusts.
Tropical Storm Chris is now tracking the East Coast of the United States and is set to cross the Atlantic to the UK.
Storm Chris could hit these shores and have an impact on the north of England and Scotland over the weekend, with the potential for heavy downpours and thundery showers caused by what will be an ex-hurricane by the time it hits the UK.
Interests along the coast of North Carolina and in Atlantic Canada should monitor the progress of Hurricane Chris.
The remnants of Beryl looked set on Monday to bring 2 to 4 inches (5-10 cm) of rain to Puerto Rico, which is still trying to recover from hurricanes that walloped the US territory a year ago, causing an estimated $90 billion in damage.
Friday and Saturday our July thunderstorms return mainly late in the afternoon with highs in the lower 90s.
It also issued a flash-flood watch for the U.S. Virgin Islands through Monday evening. Looks like another storm right next to Tropical Storm Chris, but it won't ever get named and here's why.
Puerto Rico Governor Ricardo Rossello said the territory had opened more than 40 evacuation shelters for those in need.