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2020 will be an active hurricane season for the Atlantic Basin, predicts NOAA

If La Nina develops the tropical season could become extreme.

WASHINGTON — NOAA, through the National Hurricane Center, predicted 13 - 19 named storms (winds 39 mph - 73 mph), six to ten hurricanes (winds 74 mph and higher) and three to six "major hurricanes" (winds 111 mph or higher) for this year.

On average, the Atlantic Basin sees 12 named storms each year. 

Six of those tropical storms become hurricanes. Of those six hurricanes, three become what we call 'major' hurricanes with winds of 111 mph or higher. If we have another above-average season, it would mark the fifth tropical season with above-average activity.

The last time we had a stretch of five consecutive years with more than average storms was from 1998 - 2002. 

RELATED: Here is every hurricane to ever hit the DMV

Credit: tshutt


Dr. Bell of the Climate Prediction Center gave a 60% chance of an above-average season and only a 30% chance of an average season. If La Nina were to develop by early summer, the tropical season could have even more storms.

La Nina, the warming of the waters off of the equatorial Pacific, reduces the number of tropical storms and hurricane development. During an El Nino summer, the upper winds are farther south and shear off or inhibit the development of tropical systems. If a La Nina does develop, then the trade winds are weaker and the vertical shear is weaker, making the strong upper winds (jet stream) remain farther North.

The tropical season runs from June 1 through November. 

As we have seen this year, tropical development is possible outside those dates. Tropical Storm Arthur developed in mid-May and skirted the North Carolina coast. As Arthur tracked into colder waters in the Atlantic the storm became a 'cold-core' storm.

Credit: tshutt


Water has a high capacity so it takes a while for the tropical season to get cranking, usually peaking in September.     

Credit: tshutt

We should not focus on the number of storms in a season. Landfall, or proximity to land, is the key. In 1992 we saw only seven tropical storms, four of which became hurricanes, and one of those became 'major'. By average numbers 1992 would have been an uneventful year except for Hurricane Andrew. Andrew devastated south Florida with winds of 165 mph. It is easy to get hung up on numbers but landfall is the key.

Credit: tshutt

Hurricane facts:

Average lifespan 10 days

Average diameter of the eye 14 miles

Average forward speed 12 mph

Average amount of water rained out each day 10 - 20 billion tons of water


RELATED: First tropical storm of 2020 has formed, moves near the Outer Banks

RELATED: Buzz word: 'Cut-off low' to bring rain to DMV most of the week

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