Tuesday, October 16, 2018

NOAA predicts ‘near- or above-normal’ Atlantic hurricane season

By on May 24, 2018

SAN JUAN – The National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Center announced that it forecasts a 75 percent chance that the 2018 Atlantic hurricane season “will be near- or above-normal.”

“Forecasters predict a 35 percent chance of an above-normal season, a 40 percent chance of a near-normal season, and a 25 percent chance of a below-normal season for the upcoming hurricane season,” which extends from June 1 to Nov. 30, NOAA wrote Thursday.

“With the advances made in hardware and computing over the course of the last year, the ability of NOAA scientists to both predict the path of storms and warn Americans who may find themselves in harm’s way is unprecedented,” Commerce Secretary Wilbur Ross says in his agency’s media release. “The devastating hurricane season of 2017 demonstrated the necessity for prompt and accurate hurricane forecasts.”

NOAA’s forecasters predict a 70 percent likelihood of 10 to 16 named storms (winds of 39 miles per hour [mph] or higher), of which five to nine could become hurricanes (winds of 74 mph or higher), including one to four major hurricanes (category 3, 4 or 5; with winds of 111 mph or higher). An average hurricane season, NOAA explained, produces 12 named storms, of which six become hurricanes, including three major hurricanes.

Hurricane season probability and numbers of named storms. (NOAA)

“The possibility of a weak El Niño developing, along with near-average sea surface temperatures across the tropical Atlantic Ocean and Caribbean Sea, are two of the factors driving this outlook. These factors are set upon a backdrop of atmospheric and oceanic conditions that are conducive to hurricane development and have been producing stronger Atlantic hurricane seasons since 1995,” the release reads.

“NOAA’s observational and modeling enhancements for the 2018 season put us on the path to deliver the world’s best regional and global weather models,” adds Neil Jacobs, Ph.D., assistant secretary of commerce for environmental observation and prediction. “These upgrades are key to improving hurricane track and intensity forecasts, allowing NOAA to deliver the best science and service to the nation.”

2018 Atlantic tropical cyclone names. (NOAA)

The agency’s release lists the following new NOAA tools “available this year to assist in hurricane forecasts and communications”:

  • NOAA’s fleet of earth-observing satellites is more robust than ever with the successful launch of the GOES-17 satellite in March. This satellite, along with the GOES-16 satellite – now GOES-East – contribute to a comprehensive picture of weather throughout the Western Hemisphere, allowing forecasters to observe storms as they develop.

  • The new polar-orbiting satellite, NOAA-20, will join the NOAA/NASA Suomi NPP satellite and use a suite of sophisticated instruments to gather high-resolution data from around the globe to feed NOAA’s weather models, driving the 3-7 day weather forecast that is critical to preparedness and effective evacuations.

  • The National Weather Service will run a version of the Global Forecast System (called FV3 GFS) with a new dynamic core alongside the current GFS model – often referred to as the American model – during the 2018 season. This will mark the first dynamic core upgrade to NOAA’s flagship weather model in more than 35 years, representing the first step in re-engineering NOAA’s models to provide the best possible science-based predictions for the nation.

  • NOAA’s hurricane-specific model – the Hurricane Weather Research and Forecast system – will be upgraded to offer greater resolution than ever before, increasing model resolution from 1.2 miles to 0.9 miles (2 km to 1.5 km) near the center of a storm. Additionally, the Hurricanes in a Multi-scale Ocean coupled Non-hydrostatic model was first implemented in 2017 and will undergo upgrades for the 2018 season to include greater resolution, new physics and coupling with ocean models.

  • NOAA’s National Hurricane Center will make the Arrival Time of Tropical-Storm-Force Winds graphics operational for this hurricane season. One graphic displays the “earliest reasonable” arrival time of tropical-storm-force winds, at which point further preparedness activities could be hindered. A second graphic displays the “most-likely” arrival time of tropical-storm-force winds.

“Preparing ahead of a disaster is the responsibility of all levels of government, the private sector and the public,” said acting FEMA Deputy Administrator Daniel Kaniewski. “It only takes one storm to devastate a community so now is the time to prepare. Do you have adequate insurance, including flood insurance? Does your family have a communication and evacuation plan? Stay tuned to your local news and download the FEMA app to get alerts, and make sure you heed any warnings issued by local officials.”

In addition to the Atlantic hurricane season outlook, NOAA also issued seasonal hurricane outlooks for the eastern and central Pacific basins. “An 80 percent chance of a near- or above-normal season is predicted for both the eastern and central Pacific regions. The eastern Pacific outlook calls for a 70-percent probability of 14 to 20 named storms, of which 7 to 12 are expected to become hurricanes, including 3 to 7 major hurricanes. The central Pacific outlook calls for a 70-percent probability of 3 to 6 tropical cyclones, which includes tropical depressions, tropical storms and hurricanes.”

NOAA said it will update the 2018 Atlantic seasonal outlook in early August, before the peak of the season.

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