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Last week, Hurricane Idalia rapidly strengthened from 75 mph winds on Tuesday morning to 130 mph winds by Wednesday morning.

Warm water is a major reason for Lee's rapid intensification; Lee is in waters that are 3 to 4 degrees above average.

\"PHOTO:
ABC News
PHOTO: Hurricane Lee is only one of a handful of hurricanes in the Atlantic basin during the satellite era to intensify by 85 mph or more within a 24-hour period.
>

Lack of wind shear in the atmosphere and Lee churning over the open waters of the Atlantic Ocean are other important variables.

Water temperatures in the Atlantic are influenced by a number of factors, including the overall weather pattern, and human-amplified climate change due to increased greenhouse gas emissions.

\"PHOTO:
NOAA
PHOTO: Hurricane Lee, churning over the Atlantic Ocean.
>

Lee weakened slightly to a Category 3 storm by Friday night.

Gradual restrengthening should get underway on Sunday as the unfavorable atmospheric conditions impacting Lee are likely to ease. Lee is forecast to reach category 4 strength for the second time on Monday and then start a gradual weakening trend by the middle of next week.

Large swells from Lee will impact the northeastern Caribbean Islands this weekend and into early next week as it passes well to the north. There will be no direct impacts to the Caribbean Islands. Rough surf, big waves and dangerous rip currents are a growing concern from the Leeward Islands to Puerto Rico and eventually Hispaniola, mainly the north-facing shorelines. Later this weekend, these impacts reach Turks and Caicos and parts of The Bahamas.

As Lee continues to trek northward across the western Atlantic next week, the threats of big waves, rough surf, and dangerous rip currents will gradually shift northward up along the East Coast as the week progresses.

ABC News' Ginger Zee and Dan Manzo contributed to this report.

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