Hurricane Donna

Hurricane Donna, known in Puerto Rico as Hurricane San Lorenzo, was the strongest hurricane of the 1960 Atlantic hurricane season, and caused severe damage to the Lesser Antilles, the Greater Antilles, and the East Coast of the United States, especially Florida, in August–September. The fifth tropical cyclone, third hurricane, and first major hurricane of the season, Donna developed south of Cape Verde on August 29, spawned by a tropical wave to which 63 deaths from a plane crash in Senegal were attributed. The depression strengthened into Tropical Storm Donna by the following day. Donna moved west-northwestward at roughly and by September 1, it reached hurricane status. Over the next three days, Donna deepened significantly and reached maximum sustained winds of 130 mph (210 km/h) on September 4. Thereafter, it maintained intensity as it struck the Lesser Antilles later that day. On Sint Maarten, the storm left a quarter of the island's population homeless and killed seven people. An additional five deaths were reported in Anguilla, and there were seven other fatalities throughout the Virgin Islands. In Puerto Rico, severe flash flooding led to 107 fatalities, 85 of them in Humacao alone.

Donna further intensified to a Category 4 hurricane early on September 6, and attained peak winds of 145 mph (230 km/h) twenty-four hours later. The storm then weakened over the next few days, making multiple landfalls in The Bahamas as a Category 3 hurricane. Donna generated severe wind gusts of up to 173 mph (278 km/h) over southern portions of the archipelago nation, and prolific rains affected the country and the nearby Turks and Caicos Islands. Several small island communities in the southern regions of The Bahamas were leveled, but no damage total or fatalities were reported.

As it neared the United States, Donna encountered weaker steering currents, turned northwestward, and re-intensified. Early on September 10, Donna made landfall on the Florida Keys with winds of 145 mph (230 km/h), the most severe observed there since 1935. Donna then weakened as it paralleled the southwestern Florida peninsula, making landfall south of Naples with winds of 120 mph (195 km/h). In the Florida Keys, coastal flooding severely damaged 75% of buildings, destroyed several subdivisions in Marathon. On the mainland, 5,200 houses were damaged, which does not include the 75% of homes damaged at Fort Myers Beach; 50% of buildings were also destroyed in the city of Everglades. Crop losses were also extensive. A total of 50% of the grapefruit crop was lost, 10% of the orange and tangerine crop was lost, and the avocado crop was almost destroyed. In the state of Florida alone, there were 13 deaths and $300 million in losses.

Donna weakened over Florida and was a Category 1 hurricane when it re-emerged into the Atlantic from North Florida. By early on September 12, the storm made landfall near Topsail Beach, North Carolina, as a Category 2 hurricane. Donna brought tornadoes and wind gusts up to 100 mph (155 km/h), damaging or destroying several buildings in Eastern North Carolina, while crops were damaged as far as inland. Additionally, storm surge caused significant beach erosion and structural damage at Wilmington and Nags Head. Eight people were killed and there were over 100 injuries. Later on September 12, Donna reemerged into the Atlantic Ocean and continued to move northeastward. The storm struck Long Island, New York, late on September 12 and rapidly weakened inland. On the following day, Donna became extratropical over Maine.

Meteorological history

On August 29, a tropical wave exited the west coast of Africa near Dakar. That day, it is estimated a tropical depression developed along the wave southeast of Cape Verde. There was a lack of data for several days, but it is estimated that the system gradually intensified. On September 2, ships in the region suggested there was a tropical storm after reporting winds of over . That day, the Hurricane Hunters flew into the system and observed a well-defined eye, along with winds of . Based on the data, the United States Weather Bureau office in San Juan, Puerto Rico, initiated advisories on Hurricane Donna at 22:00  UTC on September 2, about east of the Lesser Antilles. It is estimated that the storm attained hurricane status a day prior. The Azores High to the north was unusually powerful, which caused Donna to move to the west-northwest. When advisories began, Donna was intensifying into a major hurricane, which is the equivalent of a Category 3 or higher on the Saffir-Simpson hurricane wind scale; it would ultimately maintain this status for nearly eight days.

Continuing to the west-northwest, Donna strengthened further, attaining maximum sustained winds of 125 mph (205 km/h) at 00:00 UTC on September 4—an intensity it maintained for two more days. Operationally, winds were estimated to be 145 mph (235 km/h). Late on September 4, the eye of Donna moved over Barbuda, Saint Barthélemy, Saint Martin, and Anguilla, and passed just south of Anegada. Donna was then well-organized, described in the ''Monthly Weather Review'' as akin to "an intense, idealized hurricane." A weakening trough to the north turned the hurricane more northwesterly, bringing it within of the north coast of Puerto Rico. The storm then underwent further intensification to Category 4 status on September 6, and reached its first peak of 145 mph (230 km/h) by 00:00 UTC on September 7. At that time, Donna began turning more to the west as a ridge built to its north, and it soon weakened back to Category 3 status. Over the next few days, the intense hurricane moved slowly through the southern Bahamas without defined steering currents, and the eye passed near or over Mayaguana, Acklins, Fortune Island, and Ragged Island.

While passing through the Straits of Florida, Donna brushed the northern coast of Cuba on September 9 with gale-force winds. Subsequently, a cold front moved eastward through the United States and weakened the ridge, causing the hurricane to turn more to the northwest. It re-intensified over warm sea surface temperatures, and the hurricane's minimum barometric pressure dropped to on September 10. Between 02:00 and 03:00 UTC that day, the eye of Donna crossed through the Florida Keys at Conch Key, just northeast of Marathon, with sustained winds of 145 mph (230 km/h) and gusts to . The hurricane continued to the northwest along the southwest coast of Florida, weakening due to interaction with the peninsula, before making landfall on Goodland, a short distance east of Marco Island, with winds of 120 mph (195 km/h). Donna then traversed Naples and Fort Myers before turning inland to the northeast.

At 0800 UTC on September 11, Donna exited Daytona Beach into the western Atlantic with winds of about 75 mph (120 km/h), still as an organized hurricane. Accelerating to the northeast due to an approaching trough, the hurricane re-intensified slightly before making landfall near Wilmington, North Carolina, early on September 12 with winds of 105 mph (165 km/h). At 0900 UTC that day, Donna again emerged over open waters near Virginia, although it had weakened, and the eye expanded to over in diameter. Late on September 12, the hurricane made landfall near Brookhaven, New York, as a low-end Category 2 hurricane with sustained winds of 100 mph (155 km/h). On September 13, Donna became extratropical over northern Maine before entering eastern Canada, having become associated with the approaching cold front. After moving across Quebec and Labrador, Donna reached the Labrador Sea and dissipated early on September 14.

Preparations

At noon on September 3, a hurricane watch was issued for the Leeward Islands, which at 6 p.m. was upgraded to a warning. Also at 6 p.m., hurricane watches were raised for Puerto Rico and the Virgin Islands, which at 6 a.m. on September 4, were upgraded to warnings. By 6 a.m. on September 5, hurricane warnings were dropped for the Leeward Islands, and at 9 a.m., southwest Puerto Rico and the Virgin Island's hurricane warnings were downgraded to gale warnings. By noon, all remaining hurricane warnings for Puerto Rico were changed to gale warnings. In Puerto Rico, flood warnings were issued on September 5, although some residents in the region did not heed the notice; many returned to their homes after the hurricane passed to the north. On Vieques Island, about 1,700 United States Marines evacuated to naval ships. Officials advised small boats to remain at port, and thousands of residents evacuated to schools set up as Red Cross shelters. Along the Cuban coast, about 3,000 people evacuated inland or to churches and schools; while in the Bahamas, stores closed and boats were sent to port.

Beginning on September 7, hurricane watches were put in place for the Florida coast from Key West to Melbourne. The next day, the watches were upgraded to hurricane warnings from Key West to Key Largo, with hurricane watches raised on the west coast northward to Fort Myers, and gale warnings issued from Key Largo to Vero Beach. By September 11, hurricane warnings were in effect for southern Florida from Daytona Beach on the east coast to Cedar Key on the west coast, including Lake Okeechobee. Gale warnings were in place northward from Cedar Key to St. Marks, as well as from Daytona Beach northward to Savannah, Georgia. Evacuations in the Florida Keys disrupted traffic along the Overseas Highway. The Air Force evacuated 90 Boeing B-47 Stratojets from Homestead Air Reserve Base (At that time Homestead AFB). At Cape Canaveral, the threat of the storm caused the launching of two missiles to be postponed. Most flights out of Miami International Airport were canceled during the storm's approach. Officials closed schools in Miami and the Florida Keys, and recommended residents in low-lying areas of the Florida Keys and southwestern Florida to evacuate. Ultimately, about 12,000 people in southern Florida sought refuge in storm shelters, two of which were damaged during the storm. In Miami-Dade County alone, there were 77 storm shelters housing 10,000 people.

At 5 p.m. on September 10, gale warnings were extended northward to Myrtle Beach. At 11 p.m., hurricane warnings were lowered in the Florida Keys but extended northward from Daytona Beach to Savannah, Georgia. At 11 a.m. on September 11, all warnings were lowered south of Vero Beach and along the Florida west coast, while hurricane warnings were extended northward from Savannah to Myrtle Beach. At 5 p.m., hurricane warnings were lowered south of Fernandina Beach, while they were extended northward to include the entire North Carolina coast. Gale warnings were issued northward to Cape May. At 9 p.m., hurricane warnings were extended northward to Portsmouth, New Hampshire, while gale warnings and a hurricane watch were issued northward to Eastport, Maine. Ships at dock in Newport, Rhode Island were towed out into the bay to weather the storm. On September 12 at 5 a.m., hurricane warnings were extended northward to Eastport, and dropped south of Cape Hatteras. At 7 a.m., hurricane warnings were lowered south of Cape Charles. At 2 p.m., hurricane warnings were dropped south of Cape May. At 5 p.m., hurricane warnings were discontinued south of Manasquan, New Jersey. At 8 p.m., hurricane warnings expired south of Block Island. By 11 p.m. on September 12, all hurricane warnings had been lowered.Hurricane "Donna" Chronology page 2, September 2-13, 1960.
United States Weather Bureau Office of Climatology (1960). Retrieved on 2008-10-10.

Impact

Hurricane Donna was a very destructive hurricane that caused extensive damage from the Lesser Antilles to New England. At least 364 people were killed by the hurricane and property damage was estimated at $900 million (1960 USD).Edward N. Rappaport and Jose Fernandez-Partagas
The Deadliest Atlantic Tropical Cyclones, 1492-1996.
National Hurricane Center. Retrieved on 2008-10-13.

West Africa

The precursor to Hurricane Donna brought severe weather to the Dakar area of Senegal. Air France Flight 343, which was flying from Paris, France to Abidjan, Ivory Coast, attempted to land at the Léopold Sédar Senghor International Airport as a layover. However, due to squally weather, the plane instead crashed into the Atlantic Ocean, killing all 63 people on board. Heavy rainfall was also reported in Cape Verde on August 30.

Caribbean

Hurricane Donna caused very extensive damage on Saint-Martin, killed 7 and left at least a quarter of the island's population homeless. A weather station in Sint Maarten reported sustained wind gusts of 125 mph (205 km/h) and a pressure reading in the main airport.
Donna killed two people on Antigua. During the passing of Hurricane Donna, Anguilla recorded five deaths, including a woman who died when the roof of her house collapsed.

Despite passing only north of the island, Donna caused only minor damage on St. Thomas in the United States Virgin Islands. A station there reported a wind gust of . Some fences were toppled, while several houses were reported to have been damaged or destroyed. Electrical and telephone services were also disrupted. The highest daily rainfall total on the island was , causing minor local flooding. On Saint John, several small boats capsized.

While passing to the north of Puerto Rico, Donna produced winds of in San Juan. Along the north coast of the island, high tides of around and strong waves caused coastal flooding. The hurricane dropped torrential rainfall, peaking at at Naguabo in the central portion of the island. Large areas of eastern Puerto Rico received over of precipitation. The hurricane left about 2,500 people homeless on the island. Despite advanced warning of the floods, the hurricane killed 107 people on the island, of which 84 were in Humacao.

In Haiti, the southern periphery of the hurricane killed three people in Port au Prince. Later, Donna brushed the north coast of Cuba with strong winds and heavy rainfall, causing damage along much of the coast. In Gibara, the storm wrecked 80 houses.

Turks and Caicos and Bahamas

On Grand Turk in the Turks and Caicos, Donna produced winds of 58 mph (93 km/h), as the strongest winds remained north of the island. However, the storm dropped heavy rainfall of over , much of which fell in a 12‑hour period. Despite the rains, damage there was minor.

In the Bahamas, the anemometer at Ragged Island blew away after registering a wind gust. At Mayaguana, where residents evacuated to a missile tracking base, hurricane-force winds raged for 13 hours. The winds largely destroyed the village of Abraham's Bay on the island. Andros experienced hurricane-force winds for a few hours, and winds on Fortune Island were estimated at 173 mph (278 km/h) before the anemometer blew away. The strongest winds remained south of the northwestern Bahamas, which limited damage there. Donna cut communications between several islands.

Several small island communities in the southern Bahamas were leveled. North Caicos reported of rainfall in 24 hours.

United States

There were 50 people reported dead in the United States, with damages totaling to $3.35 billion. Donna crossed directly over United States Air Force radar station Texas Tower 4, causing severe damage to the structure and leading to its eventual loss in January 1961.

Donna was the only hurricane to affect every state along the East Coast with hurricane-force winds.

Florida

The U.S. state of Florida received the most damage from Hurricane Donna. Portions of southern and western Florida received over of rainfall from the hurricane, peaking at . Strong winds were observed in the state, with a sustained wind speed of in Tavernier and a gusts up to at Sombrero Key Light. In Miami, winds reached . Southeast of the city, high waves washed a freighter onshore an island. The highest observed storm surge of was reported at Marathon. The hurricane also lashed Southwest Florida, where tides were above normal.

In the Florida Keys, some areas experienced "almost complete destruction". In Key West, one death was confirmed, and 71 people were injured. About 564 homes were demolished, and an additional 1,382 were damaged, 583 of them severely. Farther north, an estimated 75% of buildings were extensively damaged between Marathon and Tavernier. In the former, tides inundated the city and destroyed several subdivisions. Storm surge inundated parts of the Overseas Highway. Six bridges between Marathon and Craig Key had been nearly or entirely swept away. Many boats and docks were severely damaged or destroyed. Additionally, the pipeline supplying water to the Florida Keys was wrecked in three places.

In Miami-Dade County (then Dade County), thousands of low-lying homes in the Homestead area were flooded. The storm also overturned 25 mobile homes and caused one death in the city. While telephone service remained mostly uninterrupted, approximately 152,000 people lost electricity. Donna was the first hurricane to affect Miami, Florida, since Hurricane King in October 1950. Although structural damage in and around Miami was generally light, winds shattered windows and uprooted trees. Heavy precipitation inundated streets. Overall, 857 houses in Dade County were destroyed, while about 2,317 others suffered damage. Significant agricultural losses were also reported. About 100 homes in Broward County reported minor damage. In Boca Raton and Delray Beach, damage was mostly limited to downed billboard signs and shattered windows.
"Little Damage From Donna In Local Area", p. 1

"Little Damage", p. 6
Boynton Beach observed wind gusts up to at the inlet. Storm surge covered State Road A1A with mud and sand. In North Palm Beach, winds shattered a few windows and destroyed a shopping center sign. A fire destroyed a cocktail lounge in Juno Beach after response teams were unable to extinguish the blaze due to high winds.

Large tracts of mangrove forest were lost in the western portion of Everglades National Park, while at least 35% of the white heron population in the park were killed. The lodge and marina at Flamingo, as well as a ranger's way station near Cape Sable, were virtually destroyed. Tides from Fort Myers Beach southward ranged between above normal. In Everglades City, about 50% of buildings were destroyed due to strong winds and coastal flooding, and roofs were blown off or damaged. Floodwaters reached about in height inside the historic Collier County Courthouse, forcing refugees taking shelter in the building to evacuate to the second floor. The city briefly became inaccessible due to inundated roads. Thousands of trees were toppled, blocking portions of the Tamiami Trail. Approximately half of the homes in Chokoloskee were destroyed, while floodwaters entered a number of homes in Ochopee. The community of Immokalee reported about $3 million in damage. In Naples, storm surge entered many high-priced homes, while the fishing pier was wrecked. A total of 19 cottages and 12 mobile homes at Gordon Pass were damaged beyond repairs. Throughout Naples, Donna demolished 87 homes and damaged 614 others in Everglades City. ''The Miami News'' described Vanderbilt Beach as being reduced to "another welter of splintered homes." Throughout Collier County, strong winds and coastal flooding combined destroyed 153 homes, severely damaged 409 others, and caused caused minor damage to 1,049 dwellings.

Donna left about $3 million in property damage and two deaths in Fort Myers. A new church in Bradenton was destroyed, while much of the city was left without power. In Winter Haven, 13 homes were destroyed, 100 others suffered major damage, and 2,400 dwellings experienced minor damage. One person was killed in the city. The turn into southern Florida lessened damage in the Tampa area. High winds deroofed in armory building in Dade City sheltering 150 people. In Volusia County, Donna destroyed 10 homes, severely damaged 112 homes, and caused minor damage to 1,100 others, while 25 buildings were demolished, 400 substantially damaged, and inflicted minor damage to 750 others. One fatality occurred in the county.

Throughout the state of Florida, the storm destroyed 2,156 homes and trailers, severely damaged 3,903, and inflicted minor impact on 30,524 others. Approximately 391 farm buildings were destroyed, an additional 989 suffered extensive impact, and 2,499 others received minor damage. Roughly 174 buildings were demolished, 1,029 received major impact, and 4,254 suffered minor damage. Additionally, 281 boats were destroyed or severely damaged. A total of 50% of grapefruit crop was lost, 10% of the orange and tangerine crops were ruined, and the avocado crop was almost destroyed. With at least $350 million in damage in Florida alone, Donna was the costliest hurricane to impact the state, at the time. Additionally, there were 14 confirmed fatalities: six from drowning, four from heart attacks, two from automobile accidents, and two from electrocution. About 1,188 others were injured.

Southeastern United States and Mid-Atlantic

The storm brought minor impact to Georgia. Wind gusts of along the coast felled trees and tree limbs, resulting in electrical and telephone-service outages. In Brunswick, GA, a power outage at the power plant caused a minor explosion. Heavy rainfall temporarily flooded some streets in the city. Further north in South Carolina, gale-force winds were reported along the coast, but caused little damage. An F3 tornado struck areas just north of Downtown Charleston, destroying several houses and severely damaging a number of others. There were 10 injuries, some of which were caused by flying glass. Damage from this tornado was over $500,000. An F1 tornado also touched down in Garden City Beach, destroying or extensively damaging six buildings. In Beaufort County, many trees were uprooted, power lines were downed, homes were unroofed, piers were destroyed, and there was significant damage to corn and soybean crops.

In North Carolina, Donna brought two tornadoes to the state. An F1 tornado damaged several small buildings in Bladen County

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