Long-range weather forecasters say the formation of another El Nino weather pattern could limit the number of hurricanes and tropical storms that develop in the Atlantic Ocean this year.
The 2017 hurricane season officially gets under way on June 1, but several forecasters have already issued their predictions on how many storms are likely to form.
- AccuWeather forecasters are anticipating a hurricane season that is less active than normal, with 10 named storms, five of which will strengthen into hurricanes. Three of those will become major hurricanes, AccuWeather predicts.
- In their annual hurricane assessment, storm researchers at Colorado State University are also calling for a season that will be slightly below average. They are predicting 11 named storms in the Atlantic this year, four of which will strengthen into hurricanes, and two of those becoming major hurricanes.
- Forecasters at The Weather Channel are predicting a hurricane season that rides right along the historical average for the Atlantic: 12 named storms, 6 becoming hurricanes, and two of those strong enough to be classified as major.
Major hurricanes are those designated as Category 3, 4 or 5 in strength. Category 3 hurricanes pack sustained winds of 111 to 129 mph, Category 4 storms reach 130 to 156 mph and Category 5 storms, which are rare, carry sustained winds of 157 mph or stronger.
Forecasters from AccuWeather, CSU and The Weather Channel all say the big wildcard this hurricane season is whether a new El Nino weather pattern will develop in the tropical waters of the Pacific Ocean this summer.
When those waters get warmer than usual, the warm air rises into the atmosphere and gets pushed from the west to the east, where it interacts with storm systems that are forming in the Atlantic. Experts say El Nino conditions usually result in more wind shear, which cuts down on the number of tropical storms and hurricanes.
Although it’s not yet known whether another El Nino pattern will take shape, hurricane researchers at CSU say there “is the potential that a weak to moderate El Nino could develop by the peak of the Atlantic hurricane season.”
Another factor that will play a role in the 2017 hurricane season is the surface water temperature in the Atlantic, the researchers said.
“Most of the North Atlantic has anomalously cooled over the past month, and the tropical Atlantic is now slightly cooler than normal,” the CSU researchers said in their Atlantic hurricane outlook. “In addition to providing less fuel for tropical cyclone formation and intensification, cooler tropical Atlantic sea surface temperatures are associated with a more stable atmosphere as well as drier air, both of which suppress organized thunderstorm activity necessary for hurricane development.”
Forecasters at The Weather Channel agree El Nino is a major wildcard.
“If El Nino fails to launch, we may be too low with our numbers,” said Todd Crawford, chief meteorologist…