Hurricane Floyd

This article is about the 1999 hurricane. For other storms of the same name, see Tropical Storm Floyd (disambiguation).
Hurricane Floyd
Category 4 hurricane (SSHS)

Hurricane Floyd over The Bahamas on September 14, 1999
Formed September 7 1999 [1]
Dissipated September 19 1999 [1]
Highest
winds
155 mph (250 km/h)[1] (1-minute sustained)
Lowest pressure 921 mbar (hPa)[1]
Damage $4.5 billion (1999 USD)
$5.3 billion (2006 USD)
Fatalities 57 direct, 20–30 indirect
Areas
affected
The Bahamas, U.S. East Coast from Florida to Maine (particularly North Carolina), Atlantic Canada
Part of the
1999 Atlantic hurricane season

Hurricane Floyd was the sixth named storm, fourth hurricane, and third major hurricane in the 1999 Atlantic hurricane season. The Cape Verde-type hurricane formed off the coast of Africa and lasted from September 7 to September 19, peaking in strength as a very strong Category 4 hurricane — just short of the highest possible rating — on the Saffir-Simpson Hurricane Scale. It was among the largest Atlantic hurricanes of its strength ever recorded.

Floyd struck The Bahamas at peak strength, causing heavy damage. It then paralleled the East Coast of the United States, causing massive evacuations and costly preparations. The storm weakened significantly, however, before making landfall in North Carolina as a Category 2 hurricane, and caused further damage as it traveled up the Mid-Atlantic region and into New England.

The hurricane produced torrential rainfall in eastern North Carolina, adding more rain to an area hit by Hurricane Dennis just weeks earlier. The rains caused widespread flooding over a period of several weeks; nearly every river basin in the eastern part of the state exceeded 500-year flood levels. In total, Floyd was responsible for 57 fatalities and $4.5 billion ($5.7 billion in 2006 U.S. dollars) in damage, mostly in North Carolina.

Contents

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Storm history

Storm path
Storm path

Floyd originated as a tropical wave that exited the coast of Africa on September 2. It moved steadily westward and remained disorganized and devoid of deep convection until September 7, when a curved band of deep convection developed over the center in response to a developing anticyclone. At this point, the National Hurricane Center designated it as Tropical Depression Eight, while it was approximately 1,000 miles (1600 km) east of the Lesser Antilles. A strong ridge of high pressure to its north forced the developing tropical cyclone westward over warmer waters, allowing it to strengthen to Tropical Storm Floyd on the 8th.[2]

Satellite image of Hurricane Floyd
Satellite image of Hurricane Floyd

Although a large storm, Floyd initially lacked a well-defined inner core, resulting in slow strengthening and preventing rapid intensification. On September 10 it organized enough to reach hurricane status, and on the 11th Floyd approached major hurricane strength with winds of 110 mph (175 km/h) while north of the Leeward Islands. The central Atlantic upper tropospheric trough, along with an upper-level low in the eastern Caribbean Sea, produced shear over the hurricane and caused its winds to weaken to 85 mph (135 km/h). A turn to the west, caused by building of high pressures, was followed by a period of rapid intensification: in 24 hours maximum sustained winds increased from 110 mph (175 km/h) to 155 mph (250 km/h), while the pressure dropped to 921 mbar (hPa) by morning on the 13th.[1] One contributor to the intensification was the high oceanic heat content along the storm's path.[2]

Hurricane Floyd at its North Carolina landfall
Hurricane Floyd at its North Carolina landfall

Hurricane Floyd remained just below Category 5 status on the Saffir-Simpson Hurricane Scale for 12 hours while crossing the Bahamas, making landfalls on Eleuthera and Abaco islands,[2] before an eyewall replacement cycle weakened it to a Category 3 hurricane with winds of 120 mph (195 km/h). The new, larger eyewall contracted slightly, and the hurricane briefly re-intensified to Category 4 status. A strong mid- to upper-level trough eroded the western portion of the high-pressure ridge, steering Floyd to the northwest. It paralleled the eastern Florida coast 110 miles (175 km) off shore, and steadily weakened because of entrainment of dry air and upper-level shear.[2] The storm remained extremely large, however; at its peak, tropical storm-force winds spanned a diameter of 580 miles (935 km), making Floyd one of the largest Atlantic hurricanes of its intensity ever recorded.[3]

Floyd accelerated to the north and northeast, and weakened greatly to a Category 2 hurricane with 105 mph (165 km/h) winds at its Cape Fear landfall on September 16. After crossing over North Carolina and southeastern Virginia, it briefly re-entered the western Atlantic Ocean before reaching Long Island on the 17th. The storm gradually lost its tropical characteristics due to an approaching frontal zone and became extratropical over southern Maine late on the 17th. The extratropical storm continued to the northeast, and after passing over the Canadian Maritimes, it was absorbed by a cold front to the east of Newfoundland.[2]

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Preparations

Although Floyd's track prediction was above average while out at sea, the forecasts as it approached the coastline were merely average compared to forecasts from the previous ten years. The official forecasts did not predict Floyd's northward track nor its significant weakening before landfall.[4] Nearly all of the East Coast, from Florida City, Florida, to Plymouth, Massachusetts, was under a Hurricane Warning at some point; however, only a fraction of this area actually received hurricane-force winds. The last time such widespread hurricane warnings occurred was during Hurricane Donna in 1960, although the warnings for that storm were accurate.[2]

Visual comparison of Floyd with Hurricane Andrew while at similar positions and nearly identical intensities
Visual comparison of Floyd with Hurricane Andrew while at similar positions and nearly identical intensities

Initial fears were of a direct hit as a large Category 4 hurricane in Florida, potentially costlier and deadlier than Hurricane Andrew had been in 1992. In preparation for a potentially catastrophic landfall, more than one million Florida residents were told to evacuate, of which 272,000 were in Miami-Dade County.[5] U.S. President Bill Clinton declared a federal state of emergency in both Florida and Georgia in anticipation of the storm's approach.[6] As the storm turned to the north, more people were evacuated as a progressively larger area was threatened. The massive storm caused the largest peacetime evacuation ever in the U.S., with around 2.6 million evacuating coastal areas in Florida, Georgia, and the Carolinas.[7]

With the storm predicted to hit near Cape Canaveral with winds of over 140 mph (225 km/h), all but 80 of Kennedy Space Center's 12,500-man workforce were evacuated. The hangars that house three space shuttles can withstand winds of only 105 mph (170 km/h), and a direct hit could have resulted in potentially billions of dollars in damage of space equipment, draining funds of an already money-strained government organization.[8] In the theoretical scenario, the damage would be caused by water, always a potential problem in an area only nine feet above sea level. If water entered the facility, it would damage the electronics as well as requiring a complete inspection of all hardware.[9] When Floyd actually passed by the area, Kennedy Space Center only reported light winds with minor water intrusion. Damage was minor overall, and was repaired easily.[10]

A hurricane warning was issued for the North Carolina coastline 27 hours prior to landfall. However, due to the size of the storm, initial forecasts predicted nearly all of the state would be affected in one form or another. School systems and businesses as far west as Asheville shut down for the day landfall was predicted, but, as it turned out, only the Coastal Plain sustained significant damage; much of the state west of Raleigh escaped unscathed.

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Impact

Death toll by area
State/country Deaths
The Bahamas 1
North Carolina 35
Virginia 3
Delaware 2
Pennsylvania 6
New Jersey 6
New York 2
Connecticut 1
Vermont 1
Total 57

With a death toll of 57, Hurricane Floyd was the deadliest United States hurricane since Hurricane Agnes in 1972. The storm also was one of the costliest in the nation's history, amounting to $4.5 billion (1999 USD; $5.3 billion in 2006 U.S. dollars). Most of the deaths and damage were from inland, freshwater flooding in eastern North Carolina.

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Bahamas

Hurricane Floyd lashed the Bahamas with winds of 155 mph (250 km/h) and waves up to 50 feet (15 m) in height.[7] A 20-foot (6 m) storm surge inundated many islands with over five feet (1.5 m) of water throughout.[11] The wind and waves toppled power and communication lines, severely disrupting electricity and telephone services for days. Damage was greatest at Abaco Island, Cat Island, San Salvador Island, and Eleuthera Island, where Floyd uprooted trees and destroyed a significant number of houses.[12] Numerous restaurants, hotels, shops, and homes were devastated, severely limiting in the recovery period tourism on which many rely for economic well-being.[13] Damaged water systems left tens of thousands across the archipelago without water, electricity, or food. Despite the damage, however, few deaths were reported, as only one person drowned in Freeport, and there were few injuries reported.[11]

To help the affected citizens, the Bahamian Red Cross Society opened 41 shelters, though within one week many returned home.[14] The Bahamas required $435,000 in aid following the storm, much of it in food parcels.[11] The Inter-American Development Bank loaned $21 million to the archipelago to restore bridges, roads, seawalls, docks, and other building projects in the aftermath of the hurricane.[15]

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Southeastern United States

Although over a million Florida residents were evacuated, the state was only lightly affected by Hurricane Floyd. Strong waves and tropical storm-force winds resulted in significant beach erosion on the east coast of Florida, as well as the loss of some boat piers in Brevard and Volusia Counties. Moderate rainfall occurred along the coastline, amounting to a maximum of 3.2 inches (81 mm) in Sanford. Floyd's winds downed hundreds of trees, damaging 357 houses. Damage in northeast Florida amounted to $46.5 million (1999 USD, $54.5 million 2006 USD), a fraction of what was originally expected.[2]

The states of Georgia and South Carolina, although threatened by the storm, were largely spared when it turned northward. Some areas of eastern South Carolina reported up to 16 inches (400 mm) of rain.[2]

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North Carolina

Coastal property damage at Pine Knoll Shores, North Carolina
Coastal property damage at Pine Knoll Shores, North Carolina

North Carolina received the brunt of the storm's destruction. In all, Hurricane Floyd caused 35 fatalities in North Carolina, much of them from freshwater flooding, as well as billions in damage.

Radar imagery of Hurricane Floyd making landfall in North Carolina.
Radar imagery of Hurricane Floyd making landfall in North Carolina.

The storm surge from the large hurricane amounted to 9–10 feet (2.7–3 m) along the southeastern portion of the state. The hurricane also spawned numerous tornadoes, most of which caused only minor damage. Damage to power lines left over 500,000 customers without electricity at some point during the storm's passage.[2]

Just weeks prior to Floyd hitting, Hurricane Dennis brought up to 15 inches (38 cm) of rain to southeastern North Carolina. When Hurricane Floyd moved across the state in early September, it produced torrential rainfall, amounting to a maximum of 19.06 inches (48 cm) in Wilmington. Though it moved quickly, the extreme rainfall was due to Floyd's interaction with an approaching cold front across the area.[2]

Extensive flooding led to overflowing rivers; nearly every river basin in eastern North Carolina reached 500 year or greater flood levels.[16] Flooding occurred very slowly as the rainfall accumulated in rivers and moved downstream; some areas did not reach peak flood levels for several weeks after the storm (see flood graphic at right). The passage of Hurricane Irene four weeks later contributed an additional six inches (150 mm) of rain over the still-saturated area, causing further flooding.

Flooded areas from Floyd along the Tar and Neuse rivers
Flooded areas along the Tar and Neuse Rivers
 — as of September 17
 — as of September 23
 — as of September 30

The Tar River suffered the worst flooding, exceeding 500-year flood levels along its lower stretches; it crested 24 feet (7.3 m) above flood stage. Flooding began in Rocky Mount, as much as 30% of which was underwater for several days. In Tarboro, much of the downtown was under several feet of water.[17] Nearby, the historic town of Princeville was largely destroyed when the waters of the Tar poured over the town's levee, covering the town with over 20 feet (6 m) of floodwater for ten days.[18] Further downstream, Greenville suffered very heavy flooding; damages in Pitt County alone were estimated at $1.6 billion (1999 USD, $1.87 billion 2006 USD).[7] Washington, where the peak flood level was observed, was likewise devastated.[19]

The Neuse River, Roanoke River, Waccamaw River, and New River exceeded 500-year flood levels, although damage was lower in these areas (compared to the Tar River) because of lower population densities. Because most of the Cape Fear River basin was west of the peak rainfall areas, the city of Wilmington was spared the worst flooding despite having the highest localized rainfall; however, the Northeast Cape Fear River (a tributary) did exceed 500-year flood levels. Of the state's rivers, only the Lumber River escaped catastrophic flooding.[20]

Rainfall and strong winds affected many homes across the state, destroying 7,000, leaving 17,000 uninhabitable, and damaging 56,000. Ten thousand people resided in temporary shelters following the storm. The extensive flooding resulted in significant crop damage. As quoted by North Carolina Secretary of Health and Human Services H. David Bruton, "Nothing since the Civil War has been as destructive to families here. The recovery process will be much longer than the water-going-down process."[7] Around 31,000 jobs were lost from over 60,000 businesses through the storm, causing nearly $4 billion (1999 USD, $4.7 billion 2006 USD) in lost business revenue.[21] In much of the affected area, officials urged people to either boil water or buy bottled water during Floyd's aftermath.[22]

In contrast to the problems eastern North Carolina experienced, much of the western portion of the state remained under a severe drought.[7]

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Virginia

Flooding in Franklin, Virginia
Flooding in Franklin, Virginia

As in North Carolina, Floyd produced torrential rainfall in Virginia, amounting to a peak of 16.57 inches (42 cm) in Newport News. [2] The rainfall led to overflowing rivers in the Chowan River Basin, some of which exceeded 500-year flood levels[20]. The Blackwater River reached 100-year flood levels and flooded Franklin with 12 feet (3.6 m) of water. Extensive road damage occurred there, isolating the area from the rest of the state. Some 182 businesses and 150 houses were underwater in Franklin from the worst flooding in 60 years. In addition, two dams along the Rappahannock River burst from the extreme flooding. Throughout all of Virginia, Floyd damaged 9,250 houses, killed 3 people, and caused $101 million in damage (1999 USD, $118 million 2006 USD).[23]

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Mid-Atlantic

Rainfall from Floyd
Rainfall from Floyd

By the time Floyd hit the shore, it was significantly weaker than it was at sea, due to the collapsing of its concentric eyes. This had little effect on the inland damage caused by the storm, however, and Floyd produced torrential rains and high winds throughout the Mid-Atlantic as far north as New York City and Long Island.[2]

Chestertown, Maryland, reported a maximum rainfall total of 14 inches (350 mm), with other locales reporting similar values.[2] Extreme river flooding caused moderate damage to bridges and roads, resulting in a damage toll of $7.9 million (1999 USD, $9.25 million 2006 USD).[24] In addition, over 250,000 residents were without electricity because of high winds blowing down power lines.[7]

Rainfall amounts peaked at 13.34 inches (339 mm) in Somerville, New Jersey, and 12.36 inches (314 mm) in Vernon, Delaware. The Raritan River basin experienced record flooding as a result of Floyd's heavy rains, four and one-half feet higher than the previous record flood crest. [25] Bound Brook, New Jersey, was especially hard hit by a record flooding event: a 42.13-foot flood crest [26], 14.13-feet above flood stage (which is 28 feet), sent 12-feet of water on Main Street and drowned three people[25] [27].

Manville, New Jersey was hit nearly as hard, with record-breaking floods coming from the Raritan River and the nearby Millstone River, which join in Manville.

Floyd's rain affecting the Mid-Atlantic.
Floyd's rain affecting the Mid-Atlantic.

Still a large tropical cyclone when it hit the Mid Atlantic states, Floyd produced a strong storm surge, peaking at 2.8 feet (0.8 m) with a storm tide of 9.34 feet (2.85 m) in Philadelphia with effects felt in parts of northern Pennsylvania including the Wilkes-Barre/Scranton metro area. Some 1,260,000 citizens across the three states lost power because of the storm, and flooding left many in Pennsylvania homeless.[7]

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New England and Canada

Floyd caused large power outages and flood damage across New England, with over five inches (130 mm) of rain being dropped over most of the area.[7] Because the storm lost tropical characteristics as it entered coastal Canada, effects there were minor, amounting to gusty winds and seas of up to 30 feet (9 m) in height.[28]

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Aftermath

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Criticism of FEMA

Flooding in Greenville, North Carolina on the Tar River
Flooding in Greenville, North Carolina on the Tar River

The Hurricane Floyd disaster was followed by what many judged to be a very slow federal response. Fully three weeks after the storm hit, Jesse Jackson complained to FEMA Director James Lee Witt on his CNN program Both Sides Now, "It seemed there was preparation for Hurricane Floyd, but then came Flood Floyd. Bridges are overwhelmed, levees are overwhelmed, whole towns under water ... [it's] an awesome scene of tragedy. So there's a great misery index in North Carolina." Witt responded, "We're starting to move the camper trailers in. It's been so wet it's been difficult to get things in there, but now it's going to be moving very quickly. And I think you're going to see a — I think the people there will see a big difference [within] this next weekend!"[29]

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Ecological effects

Runoff in the aftermath of the hurricane
Runoff in the aftermath of the hurricane

Runoff from the hurricane created significant problems for the ecology of North Carolina's rivers and sounds.

In the immediate aftermath of the storm, freshwater runoff, sediment, and decomposing organic matter caused salinity and oxygen levels in Pamlico Sound and its tributary rivers to drop to nearly zero. This raised fears of massive fish and shrimp kills, as had happened after Hurricane Fran and Hurricane Bonnie, and the state government responded quickly to provide financial aid to fishing and shrimping industries. Strangely, however, the year's shrimp and crab harvests were extremely prosperous; one possible explanation is that runoff from Hurricane Dennis caused marine animals to begin migrating to saltier waters, so they were less vulnerable to Floyd's ill effects.[30]

Pollution from runoff was also a significant fear. Numerous pesticides were found in low but measurable quantities in the river waters, particularly in the Neuse River. Overall, however, the concentration of contaminants was slightly lower than had been measured in Hurricane Fran, likely because Floyd simply dropped more water to dilute them.[31]

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Parental stress and child abuse

A 2004 study by the University of North Carolina at Chapel Hill, published in the American Journal of Preventive Medicine, found some evidence that small children living in the hardest-hit part of North Carolina suffered increased rates of child abuse during the six months following the storm. This is likely due to parental stress in rebuilding and grieving their losses in the aftermath of a catastrophe. Dr. Heather T. Keenan, co-author of the study, said, "This information may be useful in future disaster planning. To the extent possible, vulnerable families should receive additional support—both immediately after a disaster and during the recovery period."[32]

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Retirement

Because of the hurricane's destruction in North Carolina and elsewhere in the United States, the World Meteorological Organization retired the name Floyd in the spring of 2000; it will never again be used for an Atlantic hurricane. The name was replaced with Franklin in the 2005 season.

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See also

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Notes and references

  1. 1.0 1.1 1.2 1.3 1.4 NHC Hurricane Research Division. Atlantic hurricane best track ("HURDAT"). NOAA. Retrieved on 2006-02-17.
  2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 National Hurricane Center (1999). Preliminary Report: Hurricane Floyd. NOAA. Retrieved on 2006-02-13.
  3. David Herring (2000). Hurricane Floyd's Lasting Legacy. NASA. Retrieved on 2006-02-13.
  4. National Weather Service (2000). Service Assessment: Hurricane Floyd Floods of September 1999 (PDF). NOAA. Retrieved on 2006-02-13.
  5. "'Very, very dangerous' Floyd heads toward Florida", CNN, 1999-09-14.
  6. "'Floyd keeps US guessing", BBC News, 1999-09-15.
  7. 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 National Climatic Data Center (1999). Climate-Watch, September 1999. NOAA. Retrieved on 2006-02-13.
  8. Kenneth Silber (1999). Bracing for Impact. space.com. Retrieved on 2006-02-14.
  9. Jonathan Lipman (1999). Storm May Further Jeopardize NASA Budget. space.com. Retrieved on 2006-02-14.
  10. Kenneth Silber (1999). NASA Reports 'Minor' Damage at Space Center. space.com. Retrieved on 2006-02-14.
  11. 11.0 11.1 11.2 Rick Graef. The Abacos' Hurricane Floyd Information Pages Relief and Rebuilding Reports and Updates. Go-Abacos.Com. Retrieved on 2006-02-14.
  12. Margareta Wahlstrom (1999). Bahamas: Hurricane Floyd - Preliminary appeal #23/99 (PDF). International Federation of Red Cross and Red Crescent Societies. Retrieved on 2006-02-24.
  13. Agence France-Presse (1999). Battered Bahamas start difficult clean-up in Floyd's wake. ReliefWeb. Retrieved on 2006-02-14.
  14. UN Office for the Coordination of Humanitarian Affairs (1999). Bahamas - Hurricane Floyd OCHA Situation Report No. 2. ReliefWeb. Retrieved on 2006-02-14.
  15. Inter-American Development Bank (2000). IDB approves $21 million to assist Bahamas in rehabilitating works damaged by Hurricane Floyd. ReliefWeb. Retrieved on 2006-02-14.
  16. USGS: 1999 North Carolina Flooding: Summary
  17. Flooding in Tarboro and Princeville. Daniel Design Associates. Retrieved on 2006-03-11.
  18. The History of Princeville. Town Of Princeville, North Carolina. Retrieved on 2006-03-11.
  19. Landsat Views North Carolina Flood. NASA. Retrieved on 2006-03-11.
  20. 20.0 20.1 Jerad D. Bales, Carolyn J. Oblinger, and Asbury H. Sallenger, Jr. (2000). Flooding. Two Months of Flooding in Eastern North Carolina.... USGS. Retrieved on 2006-02-14.
  21. Unknown. Summary. North Carolina Floodplain Mapping Hurricane Floyd and 10-Year Disaster Assistance Report. FEMA. Retrieved on 2006-02-26.
  22. CNN.com (1999). Flooding. Waters rise, fall across eastern North Carolina. CNN.com. Retrieved on 2006-02-26.
  23. David Roth and Hugh Cobb. Virginia Hurricane History. HPC/NOAA. Retrieved on 2006-02-14.
  24. Hurricane Floyd Information: Maryland-Delaware-D.C. Area. USGS (2000). Retrieved on 2006-02-14.
  25. 25.0 25.1 Bound Brook Flood Analysis. Rutgers. Retrieved on 2006-02-25.
  26. Hurricane Floyd Passes over Avalon, New Jersey. New Jersey Coastal Monitoring Network (1999). Retrieved on 2006-05-21.
  27. Raritan River Crests. NOAA. Retrieved on 2006-11-24.
  28. Canadian Hurricane Centre. 1999 Tropical Cyclone Season Summary. Environment Canada. Retrieved on 2006-02-14.
  29. Carl Limbacher et al.. "1999 Hurricane Swamped Clinton's FEMA", NewsMax, 2005-09-07.
  30. David Herring (2000). Hurricane Floyd: Fearing the Worst. NASA. Retrieved on 2006-02-14.
  31. Jerad D. Bales, Carolyn J. Oblinger, and Asbury H. Sallenger, Jr. (2000). Water. Two Months of Flooding in Eastern North Carolina.... USGS. Retrieved on 2006-02-14.
  32. David Williamson. "New UNC study shows Hurricane Floyd boosted abuse and non-abuse brain injuries in children", UNC News Services, 2004-04-27.
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External links

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