Orkanen Helene

Orkanen Helene
Kategori 3-orkan (SSO)
Orkanen Helene nära högsta intensitet
StatusAvmattad
Formation12 september 2006
Avmattning24 september 2006
Kraftigaste vindar
195 km/h (55 m/s) (1 minuts varaktighet)
Lägsta lufttryck955 mbar (hPa; 716 mmHg)
DödaInga
SkadorInga
Drabbade områdenNorra delen av Brittiska öarna

Orkanen Helene var den fjärde orkanen och den åttonde namngivna stormen i den Atlantiska orkansäsongen 2006. Helene var en långlivad Kap Verde-typ orkan som nådde kategori 3-styrka.

Orkanen Helene orsakade minimala skador till den norra delen av Brittiska öarna, då som ett extratropiskt system.

Stormhistoria

Helenes bana

Den tropiska stormen Helene bildades den 13 september 2006 sydväst om Kap Verde-öarna, det fanns då tre namngivna oväder på Atlanten samtidigt: den avtagande Orkanen Florence vid Newfoundland, den mer kraftiga Orkanen Gordon ute på Atlanten norr om Antillerna och stormen Helene. Den 16 september förstärktes den till en orkan och nådde kategori 3-styrka den 17 september. Den 18 september befann sig orkanen cirka 1400 kilometer nordost om Antillerna och hade en vindstyrka på 205 km/h (57 m/s).

Orkanen vred sig i en vid båge öster om Bermuda, från den ursprungliga nordvästliga banan mot Nordamerika till en nordöstlig bana mot Europa. Efter att ha ändrat riktning öster om Bermuda så försvagades Helene och blev slutligen extratropisk den 24 september.

Se även

Källor

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, tidigare version.

Externa länkar

Media som används på denna webbplats

Hurricane Helene 18 sept 2006.jpg

The 2006 Atlantic Hurricane season had a slow start, with very few named storms in the first months of the season. But in early September, the previously hurricane-less season threw out four hurricanes in a row. The first two hurricanes were both short-lived relative weak Category One hurricanes, Ernesto and Florence. But the season shifted into high gear as Florence was spinning down in the North Atlantic in mid-September. Hurricanes Gordon and Helene formed in quick succession, both reaching Category Three strength a few days from each other. However, only Ernesto amongst these four hurricanes made landfall; a persistent ridgeline of high pressure over the U.S. east coast steered storms away into the North Atlantic. Florence, Gordon, and Helene have each been steered north well away from the coastland mainland, though Florence did bring strong winds, heavy rain, and storm surge to Bermuda. As of September 19, it appeared that Gordon would continue to pull away to the north and east without passing near Bermuda, and early concerns that Helene might strike the island have been revised, and this powerful hurricane was also expected to arc away to the north well away from the island.

This photo-like image was acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite on September 18, 2006, at 12:45 p.m. local time (16:45 UTC). Helene was a well-defined hurricane spiral in this image, with tightly wound central portions, complete eyewall around the storm center, and possessing a well-defined cloud-filled eye. At the time of this image, according to the University of Hawaii’s Tropical Storm Information Center, Helene had sustained winds of 185 km/hr (115 mph), making it a powerful Category Three storm. While the hurricane was not expected to cross any land in the coming days, Helene would most likely continue to track westerly and arc up north, staying over warmer seas and building power slightly or at least sustaining its Category Three status.
Helene 2006 track.png
Track map of Hurricane Helene of the 2006 Atlantic hurricane season. The points show the location of the storm at 6-hour intervals. The colour represents the storm's maximum sustained wind speeds as classified in the (see below), and the shape of the data points represent the nature of the storm, according to the legend below.
 
Tropical depression (≤38 mph, ≤62 km/h)
 
Tropical storm (39–73 mph, 63–118 km/h)
 
Category 1 (74–95 mph, 119–153 km/h)
 
Category 2 (96–110 mph, 154–177 km/h)
 
Category 3 (111–129 mph, 178–208 km/h)
 
Category 4 (130–156 mph, 209–251 km/h)
 
Category 5 (≥157 mph, ≥252 km/h)
 
Unknown

Storm type

▲ Extratropical cyclone / Remnant low / Tropical disturbance / Monsoon depression