Conditions in the atmosphere and the ocean favor a near-normal hurricane season in the Atlantic Basin this season, NOAA announced Thursday, May 24, from Miami at its Atlantic Oceanographic and Meteorological Laboratory, and home to the Hurricane Research Division. For the entire six-month season, which begins June 1, NOAA’s Climate Prediction Center says there’s a 70 percent chance of nine to 15 named storms with top winds of 39 mph or higher, of which four to eight will strengthen to a hurricane with top winds of 74 mph or higher and of those one to three will become major hurricanes with top winds of 111 mph or higher, ranking Category 3, 4 or 5.
Based on the period 1981-2010, an average season produces 12 named storms with six hurricanes, including three major hurricanes.
“NOAA’s outlook predicts a less active season compared to recent years,” said NOAA Administrator Jane Lubchenco, Ph.D. “But regardless of the outlook, it’s vital for anyone living or vacationing in hurricane-prone locations to be prepared. We have a stark reminder this year with the 20th anniversary of Hurricane Andrew.”
Andrew, the Category 5 hurricane that devastated South Florida on Aug. 24, 1992, was the first storm in a late-starting season that produced only six named storms.
Favoring storm development in 2012: the continuation of the overall conditions associated with the Atlantic high-activity era that began in 1995, in addition to near-average sea surface temperatures across much of the tropical Atlantic Ocean and Caribbean Sea, known as the Main Development Region. Two factors now in place that can limit storm development, if they persist, are: strong wind shear, which is hostile to hurricane formation in the Main Development Region, and cooler sea surface temperatures in the far eastern Atlantic.
“Another potentially competing climate factor would be El Niño if it develops by late summer to early fall. In that case, conditions could be less conducive for hurricane formation and intensification during the peak months (August-October) of the season, possibly shifting the activity toward the lower end of the predicted range,” said Gerry Bell, Ph.D., lead seasonal hurricane forecaster at NOAA’s Climate Prediction Center.
“NOAA’s improvement in monitoring and predicting hurricanes has been remarkable over the decades since Andrew, in large part because of our sustained commitment to research and better technology. But more work remains to unlock the secrets of hurricanes, especially in the area of rapid intensification and weakening of storms,” said Lubchenco. “We’re stepping up to meet this challenge through our Hurricane Forecast Improvement Project, which has already demonstrated exciting early progress toward improving storm intensity forecasts.”
Lubchenco added that more accurate forecasts about a storm’s intensity at landfall and extending the forecast period beyond five days will help America become a more Weather-Ready Nation.
The seasonal outlook does not predict how many storms will hit land. Forecasts for individual storms and their impacts are provided by NOAA’s National Hurricane Center, which continuously monitors the tropics for storm development and tracking throughout the season using an array of tools including satellites, advance computer modeling, hurricane hunter aircraft, and land- and ocean-based observations sources such as radars and buoys.
“Every hurricane season we ask families, communities, and businesses to ensure they are prepared and visit www.ready.gov/hurricanes,” said Tim Manning, FEMA deputy administrator for protection and national preparedness. “Being prepared includes developing a family emergency plan, putting an emergency kit together or updating your existing kit, keeping important papers and valuables in a safe place, and getting involved to ensure your community is ready.”