The 1948 Atlantic hurricane season featured the first tropical cyclone before the month of June since 1940. The season officially began on June 15, 1948, and lasted until November 15, 1948. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. There were fifteen tropical cyclones; ten systems strengthened into a tropical storm, six storms attained hurricane status, and four storms intensified into major hurricanes, which are Category 3 or higher on the modern-day Saffir–Simpson hurricane wind scale. Operationally, it was believed that a weak tropical disturbance formed over the southeast Bahamas in May and moved northwest into the Georgia coast near Savannah. This system was later excluded from HURDAT. The seventh tropical cyclone was not operationally considered a tropical cyclone, but was later added to HURDAT.
The sixth and eighth systems, designated as Dog and Easy by the Air Weather Service in real time, respectively, were the most intense tropical cyclones of the season, peaking as a Category 4 hurricane with a minimum barometric pressure of . The former caused eight deaths and $400,000 (1948 USD) in damage after bringing strong winds, rough seas, and heavy rainfall to Bermuda and Atlantic Canada. In Cuba and Florida, the eighth hurricane left 13 fatalities and at least $14 million in damage. The ninth hurricane, assigned the name Fox by the Air Weather Service, brought similar impact to Cuba and Florida about two weeks later. In May, the first tropical cyclone killed 80 people from flooding in the Dominican Republic. Collectively, the storms of this season left around $28.8 million in damage and 112 fatalities.
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Season summary
The Atlantic hurricane season officially began on June 15, 1948. However, tropical cyclogenesis began on April 15, about two months before the official start of the season. There was a total of fifteen tropical depressions, ten of which intensified into tropical storms, while six of those became hurricanes. Further, four of the six hurricanes deepened into major hurricanes, which are Category 3 or higher on Saffir–Simpson hurricane wind scale. Of the nine tropical disturbances detected operationally, five struck the United States with winds of or greater, while the other tropical systems affected islands, remained over the open ocean, or affected the country with winds below tropical storm intensity. Three hurricanes made landfall in the United States, while the three other storms with winds of at least largely remained at sea. Collectively, the storms of this season left around $28.8 million in damage and 112 fatalities.
The strongest storms of the season attained Category 4 intensity; two of the major hurricanes formed in the western Caribbean Sea and affected the United States in late September and October. A minimal hurricane struck southern Louisiana on September 4, causing tides of and winds of in New Orleans. A minimal tropical storm made landfall near Destin in July. An intense hurricane attained Category 4 strength and produced extensive damage and wind gusts on Bermuda in mid-September. A Category 4 hurricane struck the Florida Keys and the Everglades in September, resulting in $12 million of damages in the state. After the passage of one week, another hurricane affected the region as a Category 2 storm, after crossing Cuba with winds of . Only three direct fatalities occurred in the United States, largely because of improved evacuations and adherence to warnings and advisories.
The season's activity was reflected with an accumulated cyclone energy (ACE) rating of 95. ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. It is only calculated for full advisories on tropical systems at or exceeding , which is tropical storm strength.
Systems
Tropical Storm One
A broad area of low pressure in the central Caribbean Sea developed into a tropical depression early on May 22. The circulation moved northward, and it made landfall in southwest Haiti around 1200 UTC with winds of . Over the next day, the system crossed Hispaniola and the Turks and Caicos Islands with winds unchanged. Turning to the northeast, it strengthened into a tropical storm at 1200 UTC on May 24 while over the southwest Atlantic. Shortly afterward, the tropical cyclone turned to the north. On May 25, the storm's forward motion slowed to a crawl; within a few hours, the storm attained its estimated peak intensity of , as reported by reconnaissance aircraft, though no ships reported gale-force winds. The next day, the cyclone started to weaken, and on May 27, the system began to accelerate northward. The system diminished to a tropical depression on May 29 shortly prior to dissipation.
The tropical system brought heavy precipitation to Hispaniola, and widespread flooding took place across the region. In the Dominican Republic, the capital city of Santo Domingo (then known as Ciudad Trujillo) was impacted significantly, where of rain fell in 24 hours. More than 20 bridges were swept away, isolating the city from the rest of the country. Several people went missing in the floodwaters and it is estimated that 80 people died. The storm ranks as the deadliest recorded Atlantic tropical cyclone to form in the off-season.
Tropical Storm Two
After nearly two months of inactivity, an area of disturbed weather developed in the northern Gulf of Mexico. The area organized into a tropical depression over the north-central Gulf of Mexico on July 7. The depression strengthened slightly and became a weak tropical storm early on July 9, when it peaked with maximum sustained winds of . Several hours later, the system made landfall east of Pensacola, Florida, but quickly weakened to a depression as it moved inland. The remnants moved north through southeastern Alabama on July 10, and the circulation dissipated over southern Tennessee on July 11. The system produced minimal effects along the Florida panhandle. Winds of were measured at Pensacola during the passage of a thunderstorm, and the tropical cyclone caused heavy precipitation over northern Florida, southern Alabama, and southern Georgia. Overall damage was minimal.
Hurricane Three (Able)
A strong tropical storm, named Able by the Air Weather Service in real time, was first identified on August 26 about northeast of Saint John, as ship reports indicated winds of Force 9. However, it is likely that Able formed much farther east, possibly as a Cape Verde-type hurricane. The tropical cyclone quickly intensified to a hurricane, and it continued to steadily progress northwest. The storm strengthened into a Category 2 hurricane on August 27, and while turning west-northwestward it continued to intensify. The cyclone peaked as a Category 3 hurricane by 1800 UTC on August 28, which was measured by a reconnaissance aircraft flight. Its forward motion slowed on August 29, and it began to weaken as it turned to the north on August 30. The tropical system weakened to a minimal hurricane, and it accelerated to the northeast on August 31. The storm soon became extratropical before striking southern Newfoundland on September 2. Over the next several days, the system slowly weakened, and its remnants turned east before dissipating south of southern Iceland on September 5.
In anticipation of the storm, the U.S. Weather Bureau posted hurricane warnings in North Carolina from Wilmington to Cape Hatteras on August 30, as the storm was expected to pass over or near the state. High tides occurred along the North Carolina coastline, which prompted evacuations and precautions in the area. The remnants of the storm brought strong winds to Atlantic Canada. In Nova Scotia, the storm severely disrupted electricity and communications between Halifax and Sydney. At the latter, many trees were uprooted, with several falling on streets and cars. In Newfoundland, a wind gust as strong as was observed. The community of Port au Port was hard hit. Among the structures damaged included a store, which lost its roof, and a church, which the storm completely destroyed. Port au Port alone suffered about $200,000 (1948 CAD) in damage. Along the shore, a number of pleasure crafts were wrecked. Some other structures, trees, and boats were impacted or destroyed throughout the province. The communities along the south coast of Newfoundland collectively experienced about $400,000 (1948 CAD) in damage. Overall, the storm left over $989,000 (1948 CAD) in damage in Canada.
Tropical Storm Four (Baker)
On August 30, a tropical storm named Baker by the Air Weather Service in real time, was first detected about east of Barbados, by a ship that reported high easterly seas and winds of Force 10. Upon being initially observed, Baker was already at its peak maximum sustained winds of . The small system moved rapidly westward and slowly weakened to a marginal tropical cyclone on August 31. On the morning of September 1, Baker passed between Saint Lucia and Martinique, when a reconnaissance aircraft mission reported a minimum pressure of . Subsequent missions failed to detect a center of circulation, and the tropical cyclone quickly degenerated to a tropical depression. Baker dissipated over the eastern Caribbean Sea on September 1. The storm brought heavy rainfall to several eastern Caribbean islands, though most of it was beneficial. On Puerto Rico, water supplies and crops were replenished. Winds on Dominica interrupted telephone communications, while rough seas drove a ship ashore.
Hurricane Five (Charlie)
An area of disturbed weather organized into a tropical storm – named Charlie by the Air Weather Service in real time – on September 1 over the western Gulf of Mexico. On the morning of September 2, the poorly defined center moved northeast, and Charlie gradually intensified. It attained hurricane intensity on September 3 and then slowly accelerated toward the upper Gulf Coast. It rapidly reached its peak intensity of , and it crossed the coastline west of Golden Meadow, Louisiana, on September 4. The center moved inland over Orleans Parish, and the weakening tropical cyclone diminished to a strong tropical storm prior to moving over southern Mississippi. Charlie continued to weaken and fell to tropical depression intensity on September 5. The remnants turned to the north, and the circulation dissipated over northwestern Indiana on September 6.
On September 4, the U.S. Weather Bureau advised residents that the storm was expected to strike land between Morgan City and Grand Isle around midnight, as its forward motion had increased to . The weather service also noted that abnormally high tides were expected from the Mississippi River to Pensacola, as the center was predicted to pass east of New Orleans and move to the west of Biloxi shortly before dawn. About 1,000 people left their homes in Terrebonne Parish and took shelter in a courthouse and school buildings in Houma. As winds increased, city officials in New Orleans ordered 2,000 people to evacuate from a wartime housing project into an auditorium for shelter. Offshore, oil drilling platforms and equipment were destroyed by high seas near Grand Isle. The island itself was cut off from the mainland after inundated roadways.