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fordjah zei:De orkaan achter Irma is precies ook al duidelijk te zien op de radarbeelden?
Lakigigar zei:![]()
drie op een rij
Lakigigar zei:Irma is al meer dan 33 uur een orkaan van de hoogste categorie. Zij is daarmee de langst met deze intensiteit durende cycloon door alle weerdiensten ter wereld geregistreerd. Dat meldt Météo France.
Irma breekt het record van de supertyfoon Haiyan. Die genereerde in 2013 op de Filipijnen identieke windsnelheden (295 km per uur) maar dat slechts gedurende 24 uur.
"Een dergelijke intensiteit gedurende een zo lange tijd is in de hele wereld niet gezien sinds het begin van het satelliettijdperk een vijftigtal jaar geleden", aldus weersvoorspeller Etienne Kapikian bij de Franse weerdienst Météo France.
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Atlantic hurricanes typically propagate around the periphery of the subtropical ridge, riding along its strongest winds. If the high is positioned to the east, then hurricanes generally propagate northeastward around the high’s western edge into the open Atlantic Ocean without making landfall. However, if the high is positioned to the west and extends far enough to the south, storms are blocked from curving north and forced to continue west, putting a large bulls-eye on Florida, Cuba, and the Gulf of Mexico, as was the case during much of the 2004 and 2005 Atlantic hurricane seasons.
Proxy records based on paleotempestological research have revealed that major hurricane activity along the Gulf of Mexico coast varies on timescales of centuries to millennia. Few major hurricanes struck the Gulf coast during 3000–1400 BC and again during the most recent millennium. These quiescent intervals were separated by a hyperactive period during 1400 BC and 1000 AD, when the Gulf coast was struck frequently by catastrophic hurricanes and their landfall probabilities increased by 3–5 times. This millennial-scale variability has been attributed to long-term shifts in the position of the Azores High, which may also be linked to changes in the strength of the North Atlantic Oscillation.
According to the Azores High hypothesis, an anti-phase pattern is expected to exist between the Gulf of Mexico coast and the Atlantic coast. During the quiescent periods, a more northeasterly position of the Azores High would result in more hurricanes being steered towards the Atlantic coast. During the hyperactive period, more hurricanes were steered towards the Gulf coast as the Azores High was shifted to a more southwesterly position near the Caribbean. Such a displacement of the Azores High is consistent with paleoclimatic evidence that shows an abrupt onset of a drier climate in Haiti around 3200 14C years BP, and a change towards more humid conditions in the Great Plains during the late-Holocene as more moisture was pumped up the Mississippi Valley through the Gulf coast. Preliminary data from the northern Atlantic coast seem to support the Azores High hypothesis. A 3000-year proxy record from a coastal lake in Cape Cod suggests that hurricane activity increased significantly during the past 500–1000 years, just as the Gulf coast was amid a quiescent period of the last millennium.
Research into global warming suggests that it may be intensifying the Bermuda High in some years, independently of oscillations such as ENSO, leading to more precipitation extremes across the Southeastern United States. Latitudinal displacement of the ridge is also occurring, and computer models depict more westward expansion of the anticyclone in the future. However, during the winter of 2009–2010, the Azores High was smaller, displaced to the northeast and weaker than usual, allowing sea surface temperatures in the Central Atlantic to increase quickly.