(Bloomberg) — The Atlantic hurricane season opened with empty seas and low expectations as two storms raged off the western coast of Mexico, where they will almost certainly stay.

Hurricane Andres, which formed last week and grew into a major Category 4 system, was joined Monday by Tropical Storm Blanca. Blanca's winds are forecast to reach 140 miles (225 kilometers) per hour, Category 3 major-storm strength, while Andres weakened Tuesday to a Category 2.

"When the Atlantic is less active, the eastern Pacific tends to be more active," said Dan Kottlowski, expert senior meteorologist at AccuWeather Inc. in State College, Penn. "It is like a see-saw type situation."

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