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August 5, 2010

NOAA still expects "very active" hurricane season

With only three named storms on the books so far as we move into the traditional August-to-October peak of hurricane activity in the Atlantic, the National Hurricane Center has trimmed the top end of its predictions for hurricane activity during the 2010 season. But not by much.

There is still "a high likelihood the season could be very active, and it has the potential for being one of the more active on record," said Gerry Bell, lead seasonal hurricane forecaster at NOAA's Climate Prediction Center, a part of the National Weather Service.

NOAA/APAnd while he made no predictions on where the storms are most likely to strike the U.S., he did add that "multiple strikes are more likely during the more active seasons, such as could occur this year."

He stressed the need for advance preparations regardless of the outlook. "People need to prepare for each and every hurricane season, regardless of this outlook or any other outlook," Bell said. "It only takes one hurricane to make for a disastrous year."

"It is equally disconcerting that our coastlines have built up considerably in the last few decades, and many more people are not in potential harm's way," he said.

Separately, the Colorado State University forecast team of Phil Klotzbach and William Gray issued their August forecast update. It's unchanged from their June 2 predictions: 18 named storms, of which 10 will become hurricanes, 5 of them reaching Cat. 3 strength. Their forecast includes landfall estimates: a 50 percent chance that a major hurricane will strike the U.S. East Coast, including Florida; a 49 percent chance of a major storm striking the Gulf Coast, and a 64 percent chance of a cat. 3 storm striking in the Caribbean and Central America. All these probabilities are well above the long-term averages. 

In a teleconference Thursday, Bell said NOAA's official storm forecast for the 2010 Atlantic season now calls for 14 to 20 named storms (down from 14 to 23 in the NOAA forecast issued in May). Of those, 8 to 12 are expected to become hurricanes (down from 8 to 14). And 4 to 6 of the hurricanes (down from 3 to 7) are predicted to reach "major" force, at Cat. 3 or higher and Hurricane Alex Matamoros, Mex.sustained winds of 111 mph or more.

Three major factors are still in place to generate this high level of storm formation, Bell said. The first is a continuing, multidecadal pattern of high storm activity that began in 1995.  "So we're 16 years into an active era that historically lasts 25 to 40 years," he said.

The second is a pattern of record-high sea surface temperatures in the tropical Atlantic Ocean. Those temperatures are currently running 2 to 3 degrees Fahrenheit above average. "The previous record warm year is 2005," Bell said.

Bell didn't point this out, but 2005 brought us Hurricanes Katrina and Rita (satellite image, top), and ended with a record 27 named strorms. In fact, the NHC ran out of names that season and had to employ Greek alphabet letters for the last six tropical storms, two of which became hurricanes.

The third factor Bell cited is the strengthening of the La Nina conditions in the eastern and central tropical Pacific Ocean. La Ninas tend to change wind patterns in the tropical Atlantic in ways that weaken the high-altitude winds that otherwise tend to cut off tropical storm development. 

NOAA/NHCSo far this season, there have been three tropical storms, only one of which has reached hurricane strength. Hurricane Alex went ashore in Mexico's Yucatan Peninsula (photo above) as a tropical storm on June 27, and again in northeast Mexico on June 30 as a Cat. 2 hurricane.

Tropical Storm Bonnie crossed the southern tip of Florida on July 23 with little impact. And Tropical Storm Colin weakened in the mid-Atlantic earlier this week. Remnants of the storm (satellite image, left) continue to cross the Atlantic. They are given a 50 percent chance of regaining tropical storm strength in the next 48 hours. 

(PHOTO: Middle photo: Matamoros, Mex., by Adrian Del Angel/Agence France Press/Getty Images)

Posted by Frank Roylance at 11:46 AM | | Comments (0)
Categories: Hurricanes

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About Frank Roylance
This site is the Maryland Weather archive. The current Maryland Weather blog can be found here.
Frank Roylance is a reporter for The Baltimore Sun. He came to Baltimore from New Bedford, Mass. in 1980 to join the old Evening Sun. He moved to the morning Sun when the papers merged in 1992, and has spent most of his time since covering science, including astronomy and the weather. One of The Baltimore Sun's first online Web logs, the Weather Blog debuted in October 2004. In June 2006 Frank also began writing comments on local weather and stargazing for The Baltimore Sun's print Weather Page. Frank also answers readers’ weather queries for the newspaper and the blog. Frank Roylance retired in October 2011. Maryland Weather is now being updated by members of The Baltimore Sun staff

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