Subscribe free to our newsletters via your
. Earth Science News .

Weaker than expected Atlantic hurricane season ends
by Staff Writers
Washington (AFP) Nov 30, 2013

The 2013 Atlantic hurricane season officially ended on Saturday as the quietest since 1982 and the sixth least active since 1950, the US National Oceanographic and Atmospheric Administration said.

Thirteen tropical storms formed since early June in the Atlantic but only two, Ingrid and Humberto, reached hurricane strength.

While the number of named storms topped the historical average of 12, the number of hurricanes was well below the historic average of six medium-strength category one or two storms and three major category three storms and above.

Category three hurricanes have wind speeds of at least 110 miles (178 kilometers) per hour, while a category four storm can pack winds of 130 miles (210 kilometers) per hour or more. The most damaging are category five storms with winds of at least 155 miles (250 kilometers) per hour.

NOAA had predicted in May that 2013 would be more active than usual, with 13 to 20 tropical storms, and three to six hurricanes.

"This unexpectedly low activity is linked to an unpredictable atmospheric pattern that prevented the growth of storms by producing exceptionally dry, sinking air and strong vertical wind shear in much of the main hurricane formation region, which spans the tropical Atlantic Ocean and Caribbean Sea," said Gerry Bell, NOAA's lead hurricane forecaster.

"Also detrimental to some tropical cyclones this year were several strong outbreaks of dry and stable air that originated over Africa."

A study published in June in the British journal Nature Geoscience, found that a drop in the frequency of tropical storms in the north Atlantic during the 20th century may have resulted from human activity through the production of aerosols, tiny chemical particles suspended in the atmosphere.

Aerosols may affect the formation of clouds and more importantly act as a screen to reduce the ocean's surface temperatures, thereby reducing the heat that fuels tropical storms.

The work of Nick Dunstone of Britain's Met Office showed that storms and hurricanes were less frequent in the north Atlantic during periods of high concentration of aerosols over the region.

Conversely, the study found that measures since the 1980s to tackle pollution and improve air quality reduced levels of aerosols - and in turn ramped up hurricane activity.

And they anticipate that Earth-warming greenhouse gases will exert more influence on the frequency of tropical storms than aerosols.

Other studies have linked climate warming to an increase in intensity of tropical storms.

While the United States emerged largely unscathed from the hurricane season this year, Mexico was hit by five tropical storms and three hurricanes. Three of the storms originated in the Atlantic and the other five in the northeast Pacific, NOAA said.


Related Links
Bringing Order To A World Of Disasters
When the Earth Quakes
A world of storm and tempest

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Somalis struggle after devastating cyclone: aid agencies
Mogadishu (AFP) Nov 29, 2013
More than 100,000 people are struggling in Somalia's cyclone-hit northeastern Puntland region, aid agencies warned Friday, saying floodwaters had wiped out the livestock two-thirds of the people survive on. A joint statement by 12 agencies - including Somali organisations as well as international ones such as CARE International, Oxfam, Save the Children, Refugees International and World Vis ... read more

UN to seek more aid for Philippines typhoon displaced

Typhoons spread Fukushima fallout, study warns

85 people injured in Hong Kong high-speed ferry accident

Philippines says Super Typhoon Haiyan, other storms curb growth

Use of ancient lead in modern physics experiments ignites debate

Crippled space telescope given second life, new mission

Scientists create perfect solution to iron out kinks in surfaces

What might recyclable satellites look like?

Showdown looms for lucrative tuna industry

Water decontamination system in trouble at Japan's Fukushima

Arctic seafloor methane releases double previous estimates

Sea level rise could exceed one meter in this century

'Noisy' glaciers sound off as they melt into ocean waters

Russian court frees last Greenpeace activist

Greenland's shrunken ice sheet: We've been here before

IceBridge at McMurdo: A Year and a Half of Planning

Romania sees opportunity in China's new taste for meat

Flower Power - Researchers breed new varieties of chamomile

A plant which acclimatizes with no exterior influence

Archaeologists discover largest, oldest wine cellar in Near East

Heavy rains, flooding leave two dead in Cuba

Weaker than expected Atlantic hurricane season ends

Philippine typhoon survivors flee false tsunami alert

Somalis struggle after devastating cyclone: aid agencies

Mali defence minister vows to support coup leader's trial

French army buildup in CAR unlikely to quell bloodshed

Several said dead in air raid in Sudan's Darfur: peacekeepers

Nigeria military says bombed Boko Haram camps

Skull find shows women were sacrificed in ancient China

Study suggests inbreeding shaped course of early human evolution

Investments in Aging Biology Research will Pay Longevity Dividend

Research team discovers 'immune gene' in Neanderthals

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement