Tropical Storm Karl strengthened on Wednesday on a path that posed a risk to Mexico's Yucatan Peninsula and some of its oil installations in the Bay of Campeche while two hurricanes raced across the Atlantic Ocean.

Neither Hurricane Igor nor Julia posed an immediate threat to land or energy interests but Igor was expected to close in on Bermuda within three to four days, the U.S. National Hurricane Center said.

Karl, 11th named storm of the season, had winds of 63 mph/ as of 5 a.m./(0900 GMT) and was likely to get stronger before reaching land. Its center was expected to cross the Yucatan on Wednesday and re-enter the Gulf of Mexico after nightfall.

Upon reaching water again, Karl was expected to make hurricane status, the hurricane center said, and was set to miss U.S. oil and natural gas rigs in the northern part of the Gulf of Mexico although forecasters said it may hit Mexican oil rigs.

Mexico's state-run oil giant Pemex said it had not yet taken any action but was monitoring Karl closely. Emergency authorities warned the storm could bring heavy rains to the Mexican state of Quintana Roo, home to the Cancun beach resort.

Out in the Atlantic, Igor -- 1,090 miles/ southeast of Bermuda -- showed signs of weakening overnight but still was a category 4 hurricane on the Saffir-Simpson hurricane wind scale with 145 mile per hour/(230 kmh) winds.

Strengthening overnight, Julia -- 525 miles/ west of the Cape Verde Islands and moving northwest -- was also category 4 with 132 mph/ winds and farther from land than Igor, a day after developing into the season's fifth hurricane.

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