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Hurricane Isaac (2012)

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Tropical Depression Isaac
Current storm status
Tropical depression (1-min mean)
Satellite image Forecast map
As of:10 p.m. CDT August 30 (0300 UTC August 31)
Location:33.5°N 93.0°W ± 20 nm
About 95 mi (150 km) SSW of Little Rock, AR
Sustained winds:25 knots (30 mph; 50 km/h) (1-min mean)
Pressure:998 mbar (hPa; 29.47 inHg)
Movement:N at 9 kt (10 mph; 16 km/h)
See more detailed information.

Hurricane Isaac is currently affecting the northern Gulf Coast of the United States, including the western Florida Panhandle, Alabama, Mississippi and Louisiana, as a tropical depression. The ninth tropical cyclone and ninth named storm of the 2012 Atlantic hurricane season, Isaac developed from a tropical wave located east of the Lesser Antilles on August 21, strengthening into a tropical storm later that day. Isaac passed over Hispaniola and Cuba as a strong tropical storm, killing at least 29 people, as it entered the Gulf of Mexico. Isaac reached hurricane strength the morning of August 28. The storm made its first U.S. landfall at 6:45 p.m. CDT that evening (2345 UTC), near the mouth of the Mississippi River. It made a second and final landfall at 2:00 a.m. CDT (0700 UTC) the next morning at Port Fourchon, Louisiana.

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key Saffir–Simpson scale   Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown Storm type circle Tropical cyclone square Subtropical cyclone triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

A tropical wave crossed the west coast of Africa between August 15 and August 16. Later that day and early on August 17, the system began developing more convection, while located just west of Sierra Leone. As a result, the National Hurricane Center (NHC) began monitoring the system in the Tropical Weather Outlooks (TWOs). Thereafter, further organization briefly halted, though by early on August 18, associated convection became more concentrated. On the following day, the wave reached a "high" probability of tropical cyclogenesis. Between early on August 19 and early on August 21, minimal structural improvement occurred, despite increases in development probability. By August 21, the system developed enough organization for the NHC to initiate advisories on Tropical Depression Nine; at the time, the depression was located about 715 mi (1150 km) east of the Leeward Islands, moving westward to the south of a large ridge. Conditions were generally favorable for further intensification, with the exception of northeasterly wind shear.

Late on August 21, a Hurricane Hunters mission observed flight-level winds of 51 mph (84 km/h), and on this basis the NHC upgraded the depression to Tropical Storm Isaac. Despite its intensification, the storm was disorganized with its center located north of the deepest convection. The circulation became elongated early on August 22, and the storm absorbed drier air in its northeast quadrant. Later that day, the low pressure area passed just south of Guadeloupe and into the Caribbean Sea. Dry air continued to hinder convection, although Isaac gradually became better organized. By late on August 24, the Hurricane Hunters observed a well-defined circulation; by that time, however, the strongest convection was moving over Hispaniola. An eye feature developed early on August 25, and Isaac attained winds of 70 mph (110 km/h) before crossing the southwestern peninsula of Haiti.

While moving across Haiti, the circulation of Isaac became disrupted while the convection became disorganized. Continuing to the northwest, the storm moved along the north coast of Cuba. Convection increased over the center by early on August 26, and Isaac re-intensified slightly while entering the Straits of Florida. However, continued dry air prevented the inner core of convection from developing. Hurricane Hunters reported that a ragged eye developed multiple times, but the feature was unable to persist. The storm tracked northwestward across the Gulf of Mexico due to a subtropical ridge to its north. Although the barometric pressure continued to decrease, Isaac remained a large storm, which contributed to the lack of strengthening. At about 1620 UTC (11:20 a.m. CDT) on August 28, Isaac attained hurricane status about 75 mi (115 km) south-southeast of the mouth of the Mississippi River, based on data from the Hurricane Hunters.

After further intensification, Isaac made landfall at 2345 UTC (6:45 p.m. CDT) on August 28, just southwest of the mouth of the Mississippi River with winds of 80 mph (130 km/h). The eye moved back over water shortly thereafter, crawling just offshore of southeastern Louisiana (with little change in strength) before Isaac struck Louisiana again just west of Port Fourchon at 0715 UTC (2:15 a.m. CDT) on August 29. Hours after it made landfall, Isaac's eye became less circular and was open on the western side. Around 1900 UTC (2:00 p.m. CDT) on August 29, the hurricane weakened into a tropical storm as it slowly moved through Louisiana. Despite its weakening, Isaac continued to produce strong thunderstorms to the east and southwest of the center. Around 2100 UTC (4:00 p.m. CDT) on August 30, Isaac degenerated into a tropical depression over northern Louisiana.

Current storm information

As of 10 p.m. CDT August 30 (0300 UTC August 31), Tropical Depression Isaac was located within 20 nautical miles of 33°30′N 93°00′W / 33.5°N 93.0°W / 33.5; -93.0 (Isaac), about 95 mi (150 km) south-southwest of Little Rock, Arkansas and about 85 mi (135 km) northeast of Shreveport, Louisiana. Maximum sustained winds were 25 knots (30 mph, 50 km/h); minimum central pressure was 998 mbar (hPa; 29.47 InHg). The system was moving north at 9 kt (10 mph, 16 km/h).

For latest official information see:

Preparations

Lesser Antilles

Upon the first advisory at 0900 UTC on August 21, a tropical storm watch was issued for the British Virgin Islands, Puerto Rico and the United States Virgin Islands, as well as Saba, Sint Eustatius, and Sint Maarten. Additionally, a tropical storm warning was put into effect for Antigua, Barbuda, Dominica, dependencies of Guadeloupe, Montserrat, Nevis, Saint Kitts, and Saint Martin. By 0910 UTC, the Government of Anguilla issued a tropical storm warning for Anguilla. Later that day, the tropical storm watch in effect for Saba, Sint Eustatius, and Sint Maarten was upgraded to a tropical storm warning. Simultaneously, the Government of France issued a tropical storm warning for Martinique. Early on August 22, the tropical storm watch for the British Virgin Islands, Puerto Rico, and the United States Virgin Islands was upgraded to a tropical storm warning. Around that time, a hurricane watch was also issued for Puerto Rico and the United States Virgin Islands.

Greater Antilles and The Bahamas

At 0900 UTC on August 22, the government of the Dominican Republic issued a tropical storm watch along the north coast of the Dominican Republic, from the border with Haiti eastward to Saona Island. Simultaneously, a hurricane watch was put into place on the south coast, also extending from the Haitian border to Saona Island. At Guantanamo Bay Naval Base, a trial for five prisoners, who allegedly planned the September 11 attacks, was postponed.

At 1030 UTC on August 24, the government of Jamaica issued a tropical storm watch for the entire island of Jamaica. Early on the following day, the Cayman Islands Meteorological Service designated the Cayman Islands under a tropical storm watch. Several hours later on August 25, the tropical storm watches for both Jamaica and the Cayman Islands were discontinued.

Gulf of Mexico

Oil production in the Gulf of Mexico was down by 24% percent and gas off by 8, as several major companies (including BP and Shell) evacuated their installations in the eastern part of the basin. Overall, at least 39 (7 percent) of 596 production platforms and eight (11 percent) of 76 Gulf oil rigs were evacuated in the Gulf on August 26. By the evening of August 27, approximately 78% of the Gulf's crude oil production and 48% of its natural gas production had been closed.

United States

Florida

At 2100 UTC on August 24, a tropical storm watch was issued for all of Florida south of the Jupiter Inlet on the east coast and south of Bonita Springs; it also included Lake Okeechobee and the Florida Keys. Early on the next day, the tropical storm watch was upgraded to a warning, while the Florida Keys and the mainland from Ocean Reef to Bonita Springs was now under a hurricane watch. Further north, a tropical storm watch was issued from the Jupiter Inlet to the Sebastian Inlet. Later on August 25, the hurricane watch was switched to a warning, while a separate hurricane watch was issued from Golden Beach southward.

Isaac also posed a threat to the 2012 Republican National Convention (RNC), which is being held in Tampa, Florida during the week of August 27, 2012. According to the Republican National Convention spokesman James Davis, officials have been coordinating with the United States Secret Service, should the 50,000 politicians, delegates, and reporters require evacuation. The Republican National Convention was pushed to August 28, 2012 with the storms threatening the coast of Tampa. On August 25, the chairman of the RNC Reince Priebus announced the convention would only convene for a short amount of time on August 27 and "immediately recess until Tuesday afternoon, August 28". At the same time, Governor Scott announced he will not be attending the convention, together with Alabama governor Robert J. Bentley.

Orange juice prices also increased due to the threat of the storm in Florida, which produces more than 75 percent of orange crops in the United States. On August 25, Florida Governor Rick Scott declared a state of emergency for the state of Florida ahead of Tropical Storm Isaac. Amtrak suspended the Silver Meteor and Silver Star train service from Orlando to Miami on Sunday, August 26th. In the Florida Keys, officials canceled airplane flights and bus routes. The port at Key West was closed during the storm, as were all parks and beaches in the Keys. Emergency shelters were opened, and daily garbage pickup was canceled.

Louisiana

Louisiana Governor Bobby Jindal declared a state of emergency for Louisiana on August 26. Later that day, reports of exposed levees in Louisiana began surfacing from local news outlets. Crews were reportedly dispatched to cover the exposed dirt with heavy plastic and fill gaps in the levees with Hesco bastions. A mandatory evacuation was ordered for St. Charles Parish and for the east bank of Plaquemines Parish and in Lafourche Parish below the Leon Theriot floodgates in Golden Meadow. 4,000 National Guard troops have been activated in the state. Governor Jindal announced that he would not be attending the 2012 Republican National Convention and will remain in his state to take care of storm-related problems. On August 27, President Obama ordered federal aid to Louisiana to supplement state and local response efforts due to the emergency conditions resulting from Tropical Storm Isaac beginning on August 26, 2012, and continuing. Governor Jindal on August 27 sent a letter to the Obama administration that the declaration fell short of the help he was requesting. Gov. Jindal has temporarily suspended Louisiana's licensing requirements for emergency medical technicians, to let medical assistance officials from other states help Louisiana respond to Hurricane Isaac. Louisiana Commissioner of Administration Paul Rainwater announced that all state government offices will be closed August 29. The US Army Corps of Engineers closed the Seabrook Floodgate and the IHNC Lake Borgne Surge Barrier to protect the New Orleans area from a storm surge.

Mississippi

Mississippi Governor Phil Bryant declared a state of emergency the evening of August 26, The governor ordered mandatory evacuations to begin at 8 a.m. CT (9 a.m. ET) on August 27 for residents along the coast and in some low-lying areas inland. On August 27, the Jackson County Board of Supervisors ordered a mandatory evacuation of all areas south of U.S. Route 90. It included all areas south of US 90 in Ocean Springs, Mississippi, Gautier, Mississippi and Pascagoula, Mississippi. The evacuation was in effect as of 4pm CT. Officials dispatched 1,500 National Guard troops to the state's three southern counties, as well as 45 state troopers to ease traffic flow. On August 28, the president signed an emergency declaration for the state of Mississippi.

Alabama

Alabama Governor Robert J. Bentley declared a state of emergency ahead of Isaac. Mandatory evacuations for Baldwin and Mobile counties beginning at 8:00 a.m. on August 27 for zones one and two. Governor Bentley soon announced that he would not be attending the 2012 Republican National Convention, and will remain in his state to take care of storm-related problems. On August 28, Governor Bentley lifted the mandatory evacuation orders covering southern Baldwin and Mobile counties and issued voluntary orders for areas vulnerable to Isaac’s expected impact.

Impact

Effects by Area
Country/Region Deaths
Dominican Republic 5
Haiti 29
Puerto Rico 0 (1)
Florida 0 (2)
Louisiana 3
Mississippi 1
Total 38 (3)

Lesser Antilles

In Martinique, a meteorologist reported at least 3 inches (76 mm) of rain. One indirect fatality occurred in Puerto Rico after a 75-year-old woman fell from a second-floor balcony in Bayamón while preparing for the storm. In Naguabo, minor coastal flooding had resulted in at least one road closure. Scattered to widespread power outages were also confirmed throughout Puerto Rico.

Greater Antilles

Authorities estimated at least 30,000 residents were evacuated across the island of Hispaniola.

Haiti

Isaac swept across Haiti's southern peninsula, bringing flooding and storms in areas affected by the January 2010 earthquake. A woman and a child died in the town of Souvenance, and a 10-year-old girl died in Thomazeau when a wall fell on her. A seven-year-old boy was electrocuted in the city of Gonaives. As many as 5,000 people were evacuated because of flooding, as scores of tents in quake settlement camps collapsed and at least 300 houses were flooded in the Port-au-Prince shantytown of Cité Soleil. Doctors Without Borders announced it anticipated a spike in cholera cases due to flooding and it was preparing to receive more patients. President Michel Martelly canceled his trip to Japan to coordinate emergency response efforts and visit residents with Prime Minister Laurent Lamothe. On August 26, the Haitian government announced that at least 14,000 people had left their homes, while another 13,500 were living in emergency shelters. According to official figures, at least a dozen houses were destroyed and 269 damaged during the storm. On August 28, the death toll in Haiti was revised up to at least 24, with three others missing. News reports in the area stated up to 29 deaths, however.

Dominican Republic

Waves from Tropical Storm Isaac battering the coast of the Dominican Republic.

Authorities in the Dominican Republic evacuated nearly 7,800 people from low-lying areas, and at least 10 rural settlements were cut off by flooding. Parts of Santo Domingo lost electricity during the height of the storm. At least five fatalities were reported, including three men who drowned in flooded rivers, while 49 homes were destroyed throughout the country.

Cuba

The center of the storm crossed Cuba 28 miles (45 km) west of Maisí, the extreme eastern tip of the island, according to state television. In Baracoa, the electricity was cut off as a preventive measure, and at least two houses were destroyed by flooding. Authorities announced 230 people were in emergency shelters. Intermittent rains and gusty winds were present even in Havana, almost 560 miles (900 km) away.

United States

As of 12 P.M. (CT) Thursday, power companies say more than 900,000 customers are without power in Louisiana, Mississippi, Alabama, Florida, Texas and Arkansas.

Preliminary estimates of insured damage is near $1.5 billion.

Florida

The storm dropped heavy rainfall in Palm Beach County, with many areas reporting at least 7 inches (180 mm) and an estimated peak total of 18.07 inches (459 mm) near the center of the county. Winds left at least 16,900 customers in Palm Beach County without electricity. In Tequesta, wind gusts were estimated to have reached 60 mph (97 km/h). Additionally, winds in the area blew significant amounts of sand away, exposing rocks and created 8–10 feet (2.4–3.0 m) drops. Slightly further south, waves of 8–10 feet (2.4–3.0 m) pounded the beaches of Jupiter. Only minimal beach erosion was reported, but hundreds of sea turtle nests were swept away. A man died in West Palm Beach after driving through the storm and crashing into a concrete wall along Interstate 95. Damage in Palm Beach County totaled $71.59 million.

On August 27, an EF0 tornado touched down in Indian River County for about two minutes, damaging 95 houses. Heavy rainfall from Isaac spread up the Florida coast, with 16.5 in (420 mm) reported in Vero Beach.

As part of the Public Advisory issued at 10:00 PM CDT on August 30, the National Hurricane Center reported cumulative rainfall totals (up through 7:00 PM CDT) resulting from Isaac's impact. Vero Beach had the highest recorded amount for the State of Florida at 16.60 inches (42.16 cm); other reports included 14.41 inches (36.60 cm) at Boynton Beach, 9.37 inches (23.80 cm) at Homestead Air Reserve Base, and 7.02 inches (17.83 cm) at Ft. Lauderdale's Executive Airport.

Louisiana

While Isaac was moving ashore Louisiana, it produced a high storm surge that reached 11.0 ft (3.4 m) in Shell Beach. The large storm brought high winds across the state, with sustained winds of 67 mph (108 km/h) and gusts to 85 mph (137 km/h) on Grand Isle. As of Wednesday afternoon, over 600,000 customers were reported without power in Louisiana, mainly in Metropolitan New Orleans. The levee in southeast Louisiana's Isaac flooded Plaquemines Parish will be breached to relieve pressure on it. Flooding was reported in Slidell, Louisiana, as pumping stations were unable to keep up with rainfall rates. A 36-year-old man was killed in Vermilion Parish when he fell 18 feet from a tree while helping friends move a vehicle before the storm. On the morning of August 30, Tangipahoa Parish officials issued a mandatory evacuation for those living on or near the Tangipahoa River from Kentwood to Robert after Lake Tangipahoa Dam at Percy Quin State Park near McComb, Mississippi sustained heavy damage. McComb Mayor Whitney Rodgers said there was a 50 percent chance the dam - which holds back Lake Tangipahoa - would fail. After an initial rescue of 115 survivors from flooded homes in Braithwaite on the east bank of Plaquemines Parish on August 29, 2 bodies were later discovered the next day floating in the kitchen of a flooded home after a rescued evacuee in a shelter informed authorities of additional missing people.

Mississippi

A 8.3-foot (250 cm) storm surge was reported in Hancock County as of Tuesday evening. Wind gusts reached 70 mph (110 km/h) in Gulfport. Three adults and one infant in Mississippi were rescued overnight from a houseboat. There are about 2,132 evacuees housed in 31 shelters across the state and about 4,000 homes were without power as of 5:30 a.m. CT. A man was crushed in the cab of his tow truck around midnight in Picayune, Mississippi. A tree fell on the truck's cab while he was on a call to assist a stranded motorist. The National Weather Service reported that 17.04 inches (43.28 cm) of rain had fallen at Kiln, Mississippi through 7:00 PM CDT on August 30; 10.85 inches (27.56 cm) was recorded at Gulfport.

Alabama

11.68 inches (29.7 cm) of rain was recorded at Mobile Regional Airport through Wednesday. Coastal flooding was reported in several towns in Mobile and Baldwin Counties including Bayou la Batre, Gulf Shores and Orange Beach.

References

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See also

External links

Tropical cyclones of the 2012 Atlantic hurricane season
TSAlberto TSBeryl 1Chris TSDebby 2Ernesto TSFlorence 2Gordon TSHelene 1Isaac TSJoyce 2Kirk 1Leslie 3Michael 1Nadine TSOscar TSPatty 1Rafael 3Sandy (history) TSTony

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