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The 1921 Atlantic hurricane season was an active hurricane season, with 12 tropical cyclones forming. Among them, seven became tropical storms, of which five strengthened into hurricanes. Furthermore, two of these strengthened into a major hurricane, Category 3 or higher on the modern-day Saffir–Simpson hurricane wind scale, the most since the 1917 season. ACE is a metric used to express the energy used by a tropical cyclone during its lifetime. Therefore, a storm with a longer duration will have high values of ACE. It is only calculated at six-hour increments in which specific tropical and subtropical systems are either at or above sustained wind speeds of , which is the threshold for tropical storm intensity. Thus, tropical depressions are not included here.

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Timeline

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Systems

Hurricane One

A westward-moving disturbance developed into a tropical depression over the western Caribbean Sea on June&nbsp;16. About 24&nbsp;hours later, the depression intensified into a tropical storm. Late on June&nbsp;17, the storm made landfall in northern Belize with winds of . The cyclone moved northwestward and weakened slightly while crossing the Yucatán Peninsula, but remained a tropical storm. Early on June&nbsp;18, the system emerged into the Gulf of Mexico and began to curve north-northwestward. Continuing to intensify, it attained hurricane status around 12:00&nbsp;UTC on June&nbsp;20. The hurricane drifted and strengthened further. Early on June&nbsp;22, sustained winds associated with the storm peaked at . At approximately 18:00&nbsp;UTC, the cyclone made landfall near Matagorda, Texas, at the same intensity. A ship offshore observed a barometric pressure of , which would be the lowest in relation to the storm. One death occurred in Longview when a man was struck by lightning, with the same bolt also killing two calves and a cow.

Hurricane Two

An area of disturbed weather developed into a tropical depression over the Bay of Campeche on September&nbsp;4. the storm total rainfall there was . The deluge led to one of the most destructive floods in the history of San Antonio. Water rose to deep in the city, forcing people to evacuate vertically within taller buildings. The most significant river floods occurred along the Little and San Gabriel rivers, where 159&nbsp;people perished. Combined with the death toll from elsewhere across the region, 215&nbsp;people died due to this storm and damages were estimated at $19&nbsp;million. Strong winds on Trinidad disrupted telegraphic communications. A number of lights and small craft at Port of Spain and San Fernando were sunk or washed ashore. Two fatalities occurred on the island, one from drowning and the other from electrocution. Throughout the Windward Islands, 80&nbsp;deaths were reported. Strong winds generated by the storm caused extensive damage to buildings in Puerto Rico and Bermuda,

Hurricane Four

A low pressure area of non-tropical origins became a tropical storm on September&nbsp;8 while situated about north of the Lesser Antilles. The system moved northwestward and intensified into a hurricane on October&nbsp;22 and a major hurricane by October&nbsp;23. Later that day, the cyclone peaked as a Category&nbsp;4 with winds of . After entering the Gulf of Mexico, the hurricane gradually curved northeastward and weakened to a Category&nbsp;3 before making landfall near Tarpon Springs, Florida, late on October&nbsp;25. The storm quickly weakened to a Category&nbsp;1 hurricane while crossing Central Florida, before reaching the Atlantic Ocean early on the following day. Thereafter, system moved east-southeastward and remained fairly steady in intensity before weakening to a tropical storm late on October&nbsp;29. The storm was then absorbed by a larger extratropical cyclone early the next day, with the remnants of the hurricane soon becoming indistinguishable. In Florida, storm surge and abnormally high tides caused damage along much of the state's west coast from Pasco County southward. Several neighborhoods and sections of Tampa were inundated, especially in 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. Five deaths occurred in Tampa, two from drowning and three after people came into contact with a live wire. The storm left two additional fatalities in St. Petersburg. with many structures and trees suffering extensive damage. 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&nbsp;million in damage and the loss of at least 800,000&nbsp;boxes of citrus crops alone. Overall, the hurricane left at least eight deaths and about $10&nbsp;million in damage.

Tropical Storm Seven

A tropical depression formed about north-northeast of San Juan, Puerto Rico, early on November&nbsp;19. Moving west-northwestward, the depression slowly strengthened, becoming a tropical storm on November&nbsp;20. The following day, it began moving through the Bahamas and peaked with winds of , based on observations from the S. S. Mexican.