Sunday, April 8, 2018

First Forecast: "Slightly above-average 2018 Atlantic hurricane season predicted by CSU team"

CSU's Emeritus Professor Bill Gray, who died a couple years ago this month, more or less  popularized Seasonal Hurricane Forecasting, giving the National Hurricane Center a run for their money.
From Colorado State University:
Colorado State University hurricane researchers are predicting a slightly above-average Atlantic hurricane season in 2018, citing the relatively low likelihood of a significant El Niño as a primary factor.

Tropical Atlantic sea surface temperatures are currently near their long-term average values. Consequently, they are considered a neutral factor for 2018 Atlantic hurricane activity at the present time.

A weak La Niña this past winter has weakened slightly over the past few weeks. While there is the potential that a weak El Niño could develop by the peak of the Atlantic hurricane season, the odds of significant El Niño development appear relatively low. El Niño tends to increase upper-level westerly winds across the Caribbean into the tropical Atlantic, tearing apart hurricanes as they try to form.
The western tropical North Atlantic is currently slightly warmer than normal, while the eastern tropical Atlantic is slightly cooler than normal. Colder-than-normal sea surface temperatures provide less fuel for tropical cyclone formation and intensification. They are also associated with a more stable atmosphere as well as drier air, both of which suppress organized thunderstorm activity necessary for hurricane development.

14 named storms
The CSU Tropical Meteorology Project team is predicting 14 named storms during the Atlantic hurricane season, which runs from June 1 to Nov. 30. Of those, researchers expect seven to become hurricanes and three to reach major hurricane strength (Saffir/Simpson category 3-4-5) with sustained winds of 111 miles per hour or greater.

The team bases its forecasts on over 60 years of historical data that include Atlantic sea surface temperatures, sea level pressures, vertical wind shear levels (the change in wind direction and speed with height in the atmosphere), El Niño (warming of waters in the central and eastern tropical Pacific), and other factors.

So far, the 2018 hurricane season is exhibiting characteristics similar to 1960, 1967, 1996, 2006  and 2011....MUCH MORE
There does seem to be an El Niño forming for the winter of 2018-2019 but any effects would arrive after the Nov. 30 end of the hurricane season.