Hurricane Joaquin strengthened to major hurricane status as a Category 3 storm Wednesday night, and is now hammering the central Bahamas. Prospects remain worrisome for the U.S. mainland as the official forecast continues with a chance of the East Coast seeing its first landfalling hurricane in 15 months.
Joaquin’s eyewall is hammering Samana Cays island in the central Bahamas, moving toward Rum Cay and San Salvador islands momentarily. Part of the eyewall may also affect Crooked Island and Long Island (Bahamas). With the Category 3 hurricane passing close to the islands at a relatively slow speed, and perhaps even intensifying to Category 4 status, a catastrophic situation may unfold there with a prolonged period of intense hurricane conditions.
Hurricane warnings have been expanded to include more of the Bahamas as Hurricane Joaquin churns toward the nation of islands east of Florida.
An Air Force Reserve Hurricane Hunter reconnaissance aircraft flying through Hurricane Joaquin Wednesday night found winds near the center had become much stronger, prompting the agency to raise the wind figure to 105 mph in the 8 p.m. advisory and 120 mph at 2 a.m. Thursday. The latter makes Joaquin a Category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale.
Equipment on the plane measured surface winds as high as 130 mph in gusts within powerful thunderstorms in the developing eyewall in the still-growing tropical cyclone.
With Joaquin’s winds strengthening by a factor of 30 mph within a 24-hour period on Wednesday, rapid intensification criteria has been met. Further strengthening is expected Thursday.
Hurricane Joaquin continues to intensify as wind shear – harmful to the intensification of tropical cyclones – lessens, and a complicated atmospheric pattern makes its future track – including any potential landfall on the U.S. East Coast – extremely difficult to forecast.
Residents along the East Coast of the U.S. should pay close attention to the forecast now through this weekend. It’s a particularly difficult forecast that hinges on the behavior of several different atmospheric features over North America and the North Atlantic Ocean.
Computer forecast models – and the meteorologists who use them for guidance – are grappling with a complex interaction between Joaquin, a cold front near the East Coast, the remnants of Tropical Storm Ida, a strong bubble of high pressure aloft over the North Atlantic Ocean, and a potentially strong area of low pressure aloft digging into the southeastern U.S. later this week.
Complicating the forecast is the fact a more reliable forecast model keeps Joaquin appreciably away from the East Coast.
Furthermore, overnight Wednesday night, another pair of somewhat less reliable forecast models moved their tracks farther east, still affecting the U.S. East Coast, but, again, farther east than previous forecast model runs. NOAA Gulfstream aircraft surveillance missions and extra balloon soundings launched from National Weather Service offices on the mainland may have contributed to the eastward shift in some of the model guidance overnight Wednesday night.
Photo courtesy news24us.info
Despite all that, there still remains considerable uncertainty in Joaquin’s future track, and, thus, its potential impact on the U.S. this weekend.
The National Hurricane Center says hurricane watches may have to be issued for parts of the East Coast as soon as tonight.
Because Joaquin is strengthening and drifting ever closer to the Bahamas, the government of that country has issued warnings and watches for much of its territory. Here are the details as of 5 a.m. EDT:
A hurricane warning remains in effect for the northwestern Bahamas including the Abacos, Berry Islands, Eleuthera, Grand Bahama Island, and New Providence. This includes both Nassau and Freeport.
A hurricane warning remains in effect for the central Bahamas, including Cat Island, the Exumas, Long Island, Rum Cay and San Salvador.
A hurricane watch remains in effect for Bimini and Andros Island.
A tropical storm warning is now in effect for Andros Island as well.
A tropical storm warning continues for the southeastern Bahamas including the Acklins, Crooked Island, Long Cay, the Inaguas, Mayaguana, and the Ragged Islands, but excluding the Turks and Caicos Islands.
Joaquin will eventually make a sharp right turn and head north sometime Friday, but it’s already too late for that turn to spare the Bahamas from dangerous impacts.
At this time, we expect some of the worst impacts in the Bahamas to occur on San Salvador and Rum Cay, where the eye of Joaquin is likely to pass nearby or overhead late Thursday or Thursday night as the hurricane peaks in intensity, potentially as a Category 4 storm. Other islands in the central Bahamas may take a direct hit as well depending on the timing of Joaquin’s turn.
Given the forecast, potential impacts for San Salvador and Rum Cay (and any other islands the eyewall of Joaquin touches) include:
Catastrophic wind damage: Sustained winds up to 140 mph are forecast, with gusts to 165 mph. Even well-built homes may lose their roofs and even experience failure of one or more exterior walls. Most trees will be snapped and many uprooted. Given the small size of the islands, the electrical grid will likely experience a complete blackout and may be partially or completely destroyed. Recovery may take weeks or months.
Dangerous storm surge and waves: In areas where the wind blows toward shore, water levels may rise 5 to 8 feet above normal tide levels, flooding low-lying coastal areas. Extremely high waves from the open ocean may then damage or destroy any structures flooded by seawater.
Extreme rainfall: Rainfall totals in excess of 20 inches are possible, leading to potentially life-threatening flash flooding. Storm surge and the generally low elevations of the islands will greatly limit the ability of rainwater to run off into the ocean, further aggravating the situation.
The northwestern Bahamas, including Nassau and Freeport, are less likely to encounter Joaquin’s dangerous core – but may still see hurricane conditions develop later Thursday into Friday.
Track Forecast: Still Extremely Challenging
As discussed above, it is simply too soon and the uncertainty is too high to be confident about specific impacts from Joaquin itself for the U.S. East Coast at this time.
The National Hurricane Center’s official forecast cone is below. The official forecast remains a compromise between the competing scenarios from the computer models.
Regardless of the ultimate outcome of Joaquin’s path, portions of the East Coast will still see multiple impacts from the evolving large-scale weather pattern, including flooding rainfall, gusty winds, high surf, beach erosion and some coastal flooding. Click the link below for more information on that story.
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