Thousands without power in Puerto Rico
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Hurricane Erin grows into Category 4
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Storms that ramp up so quickly complicate forecasting and make it harder for government agencies to plan for emergencies. Hurricane Erick, a Pacific storm that made landfall June 19 in Oaxaca, Mexico, also strengthened rapidly, doubling in intensity in less than a day.
For the latest news on Hurricane Erin, visit USA TODAY's coverage for Wednesday, Aug. 20. Hurricane Erin slowly moved northward on Tuesday, triggering rough surf and dangerous rip currents along the East Coast that have already resulted in dozens of water rescues,
A disturbance in the Atlantic following Hurricane Erin is now expected to track northward, National Hurricane Center data shows.
Dangerous coastal impacts from Hurricane Erin will peak along the East Coast on Wednesday and Thursday as the storm passes offshore.