The Tampa Bay hurricane of 1921 (also known as the 1921 Tarpon Springs hurricane) was a destructive and deadly major hurricane which made landfall in the Tampa Bay area of Florida in late October 1921, becoming the first to do so there since the hurricane of 1848. The eleventh tropical cyclone, sixth tropical storm, and fifth hurricane of the season, the storm developed from a trough in the southwestern Caribbean Sea on October 20. Initially a tropical storm, the system moved northwestward and intensified into a hurricane on October 22 and a major hurricane by October 23. Later that day, the hurricane peaked as a Category 4 on the modern day Saffir–Simpson scale with maximum sustained winds of . After entering the Gulf of Mexico, the hurricane gradually curved northeastward and weakened to a Category 3 before making landfall near Tarpon Springs, Florida, late on October 25. The storm weakened to a Category 1 hurricane while crossing the Florida peninsula, and it reached the Atlantic Ocean early the following day. Thereafter, the system moved east-southeastward and remained fairly steady in intensity before weakening to a tropical storm late on October 29. The storm was then absorbed by a larger extratropical cyclone early the next day, with the remnants of the hurricane soon becoming indistinguishable.

The storm brought strong winds to the Swan Islands, including hurricane-force winds on the main island. Heavy rains fell in Cuba, particularly in Pinar del Río Province, but only minor damage occurred. In Florida, storm surge and abnormally high tides caused damage along much of the state's west coast from Pasco County southward. Several neighborhoods in Tampa were inundated, especially the interbay neighborhoods of Ballast Point, DeSoto Park, Edgewater Park, Hyde Park, Palmetto Beach, and other areas in the vicinity of Bayshore Boulevard. Strong winds also damaged hundreds of trees, signs, buildings, and homes. Four deaths occurred in Tampa, three from drownings and another after a man touched a live wire. The storm left two additional fatalities in St. Petersburg. A number of streets in Tarpon Springs were littered with masses of debris, with many structures and trees suffering extensive damage. Southward in Manatee County and Sarasota County, many waterfront communities along Sarasota Bay and the Gulf of Mexico, such as Cortez and Sarasota, suffered heavy structural losses. Strong winds occurred as far east as the Atlantic coast of the state, though wind damage east of the Tampa Bay area was generally limited to downed trees and power lines, resulting in power outages, particularly in Orlando. Agriculture throughout the state experienced significant impact as well, including over $2 million (equivalent to $ million in ) in damage and the loss of at least 800,000 boxes of citrus crops alone. Overall, the hurricane left at least eight deaths and about $10 million (equivalent to $ million in ) in damage.

Meteorological history

In mid-October, a significant drop in atmospheric pressures over the western Caribbean Sea coincided with the development of a trough on October 17. Observations suggested that a circulation formed on October 20, with the Atlantic hurricane database listing a tropical storm beginning at 00:00 UTC, with the system was situated about southeast of the Archipelago of San Andrés, Providencia and Santa Catalina. The cyclone initially moved slowly northwestward due to a high pressure system over Bermuda. Early on October 22, the storm intensified into a Category 1 hurricane, based on sustained winds of on Great Swan Island. The hurricane strengthened significantly over the northwestern Caribbean, becoming a Category 2 hurricane at 00:00 UTC on October 23 and a Category 3 hurricane six hours later. Around 18:00 UTC, the cyclone reached Category 4 intensity and peaked with maximum sustained winds of and a minimum barometric pressure of . The latter was observed by the schooner Virginia, while the former was estimated using the southern wind-pressure relationship.

Early on October 24, the hurricane moved northward across the Yucatán Channel and entered the Gulf of Mexico. Thereafter, the system gradually curved to the northeast as the high pressure weakened and the storm became under the influence of a southwesterly air current. At 12:00 UTC on October 25, the cyclone weakened to a Category 3 hurricane. About 10 hours later, the hurricane made landfall near Tarpon Springs, Florida, with maximum sustained winds of , making it the first and most recent major hurricane to hit the Tampa Bay area since 1848. The storm further weakened to a Category 1 hurricane over Central Florida early on October 26, then emerged into the Atlantic Ocean near New Smyrna Beach after about six hours over land. The hurricane briefly re-strengthened to reach winds of early on October 27 as it drifted to the east-southeast for about two days. Late on October 29, the system accelerated northeastward and weakened to a tropical storm, before being absorbed by a large extratropical cyclone about southeast of Bermuda at 00:00 UTC on October 30. About six hours later, the remnants of the hurricane became indistinguishable. These remnants were the second storm encountered by USS Olympia in its Atlantic crossing with the American unknown soldier from World War I.

Preparations Forecasters at the United States Weather Bureau issued advisories for ships and oceangoing vessels, while posting hurricane warnings for areas in western Florida stretching from Key West to Apalachicola on October 24 and October 25. Additionally, storm warnings were issued eastward from mouth of the Mississippi River and along the east coast of Florida.

Impact In Cuba, heavy rainfall in Pinar del Río Province caused rivers and creeks to rise. However, only minimal damage was reported.

The hurricane passed to the west of the Florida Keys as a Category 4 hurricane. Its large wind field caused tropical storm force winds to the islands, with the highest wind report being in Key West. Rainfall from the hurricane's outer bands was intermittent, and storm tides of were reported. Further north, Captiva and Sanibel islands were completely inundated with water. In Punta Rassa, the majority of homes were either extensively damaged or washed away. Most highways leading out of Fort Myers were impassible due to high water. Damage to railroad tracks resulted in a suspension of service for three days. On Estero Island, a number of buildings were damaged, including the casinos, cottages, and Crescent Beach resort. The storm also destroyed the mausoleum of Dr. Cyrus Teed, the founder of Koreshanity. Damage in Lee County reached about $1.5 million. Along the Myakka River near Boca Grande, the railroad bridge washed away, while the storm also destroyed two vehicular bridges over the Charlotte Harbor Bay. The streets of Punta Gorda were inundated, where a tide of above normal was recorded. One death occurred in the city due to drowning.Barnes p. 108 At Egmont Key, above normal tides forced 75 people to seek shelter in the lighthouse. The entire island was inundated by water.Thompson and Thompson p. 80

In Manatee County, the storm demolished much of the waterfront not only along Tampa Bay, but also Sarasota Bay and the Gulf of Mexico, On Passage Key, sustained winds of and a storm surge of were reported. During the storm, a cyclone-induced tidal wave was reported to have washed away the island's vegetation, which never rebounded. Southward on Anna Maria Island, the storm washed away high ground that was once a characteristic of the north end of the island. In the small fishing village of Cortez, the storm destroyed all of the community's fish houses and docks. The storm surge completely flooded the area up to 67th Street in Bradenton. Cortez's residents, with little forewarning of the storm, sought refuge in their rural graded schoolhouse, which withstood the storm while many houses floated away. Inland, the storm caused flooding along the Myakka River and the destruction of many wharfs along the Manatee River.

The hurricane brought a storm surge of to Tampa Bay. The highest rainfall total in Tampa was at . However, the observer noted that winds probably blew water out of the gauge.Barnes p. 104 The barometric pressure fell to , breaking a previous record set in 1910. The hurricane also brought sustained winds of and a storm tide of . Damage from the wind was generally minor, while most of the impact wrought by the storm was due to abnormally high tides in Tampa and elsewhere in the area. Much of the city was flooded, with the worst along Bayshore Boulevard, where some of the most expensive properties were located. At Hyde Park, dwellings were inundated about halfway up the first story, prompting several people to be rescued by boat. Electrical poles and wires were washed away near the intersection of Bayshore Boulevard and Howard Avenue. The latter was also left impassible by car. In the Palmetto Beach neighborhood, much of the section was inundated. A group of about 40 volunteers rescued a number of women and children. A total of 50 homes were destroyed by cedar logs used to construct cigar boxes at the Tampa Box Company on 22nd Street.

At Ballast Point, the pavilion and bathhouse were destroyed by the storm. Nearby, the Tampa Yacht and Country Club suffered severe damage. Many cars along the waterfront were severely damaged and nearly all flat railroad cars were submerged. The Malloy Line dock was also left under several feet of water. A number of waterfront warehouses were also damaged by floodwaters. After the Tampa Electrical Company power house experienced water damage, the electricity was shut off. Additionally, the company's cable station was flooded under several feet of water. Winds downed hundreds of trees and sign across roadways and tore-up awnings. At least 50 awnings were ripped from a bank building on Franklin Street alone. Falling trees also damaged the post office and the YMCA. Almost 500 dwellings in the neighborhood of Ybor City were demolished. Five people were killed in the city, three from people coming into contact with a live wire and the other two from drowning. Only minor damage occurred in Plant City. Throughout Hillsborough County, many county roads were impassable due to downed telegraph poles and other debris, especially between Tampa and Plant City.

Tides above normal and storm surge in St. Petersburg damaged or destroyed all four fishing piers. Many ships and boats of all sizes capsized or were beached, including the trawler Hypnotist, which ejected the crew of seven into the water, all of whom were rescued. The St. Petersburg Beach Hotel was destroyed, after employees swam through the lobby for safety.Barnes p. 105 At the office of the St. Petersburg Times, then located at Fifth Street and First Avenue South, the loss of electricity resulted in staff working overnight with lanterns. With no power to operate the typesetting machine, the employees connected their linotype machine to a two-cylinder motorcycle to publish the "Motorcycle Extra". Two deaths occurred in St. Petersburg, one from a heart attack during preparations for the storm and the other from a man being crushed by a falling roof.Barnes p. 107