Hurricane Dean was a strong tropical cyclone that affected the United States and Atlantic Canada while remaining offshore in early August 1989.

Dean was initially difficult to forecast; it was thought to pose a possible threat to the Lesser Antilles, and as a result several evacuations occurred, and many hurricane watches and warnings were issued.

By July 31 the tropical wave began to be classified, using the Dvorak Technique, by satellite analysts at the National Hurricane Center, in part due to persistent deep convection.

Shortly thereafter, the system became organized enough that the National Hurricane Center began classifying it as Tropical Depression Five, roughly halfway between Cape Verde and the Lesser Antilles.

The trough of low pressure forming off the East Coast of the United States was deepening, causing Dean to curve northward while remaining nearly stationary.

While Dean was a Category 2 hurricane, it attained its peak intensity with winds of 105 mph (169 km/h) and a minimum pressure of 968 mbar (hPa; 28.59 inHg).

[1] After peak intensity, the forward speed of the storm continued to increase as it approached Atlantic Canada while weakening back to a Category 1 hurricane.

In Puerto Rico, residents were advised to secure or stow away loose objects and stock up on emergency supplies.

1.1 million residents in the city of San Juan went to supermarkets to get much-needed supplies in anticipation that the storm might hit Puerto Rico.

[6][9][10] Strong winds from Hurricane Dean caused considerable power line damage, leaving 65,000 residents without electricity.

[6][10] Although Dean remained away from the United States coastline, it produced storm tides of 1.7 ft (0.52 m) to North Carolina.

A majority of rainfall was reported on the west side of Dean, but minimal precipitation had been recorded to the east of the storm.

Although there were no reports of damage in Atlantic Canada from Hurricane Dean, three sailors had to be rescued by the Canadian Coast Guard when their boat got dismasted during the storm.