Monday, September 24, 2007

La Niña Is Spanish For The Niña!

Left: Image by bloop at B3ta.


Puh-leeze! This La Niña, so far, is as weak as a premature infant. The Southern Oscillation Index is at 5.5 - it barely qualifies as La Niña! I've got more severe weather blowing around in my closet than this La Niña!:
Experts predict a run of severe weather in the coming months, with devastating floods striking some parts of the world while severe droughts afflict other regions, as the climate phenomenon known as La Niña gathers momentum.

A chronic drought afflicting southern California and many southeastern states of America could be exacerbated, with Los Angeles heading for its driest year on record. In contrast, western Canada and the northwestern US could turn colder and snowier. Mozambique, southeast Africa, and northern Brazil may face exceptionally heavy rains and floods, while southern Brazil and much of Argentina suffer drought.

La Niña could even rearrange the pattern of sea ice around the Antarctic, pushing the ice pack towards the Pacific side of the continent. Already, torrential rains have triggered severe floods across a huge swath of Central Africa, stretching from Senegal in the west to Uganda in the east.

...Met Office scientists have found that La Niña is likely to have played a part in the abysmal British summer. By upsetting the usual track of the high-altitude jet stream towards Britain, it delivered barrages of slow-moving Atlantic depressions with torrents of rain. La Niña may also have been involved in the spectacular Asian monsoon this summer, leading to floods that killed about 1,000 people in India and Bangladesh. And it allows hurricanes to develop - already this month the Caribbean and the Gulf of Mexico have experienced two monstrous Category 5 storms. Another hurricane broke the record for the fastest intensification of a storm.

La Niña occurs when the tropical seas of the Pacific off the coast of Latin America cool down, while the waters turn warmer towards Australia, the Philippines and Indonesia. That lurch in ocean temperatures can send weather systems into havoc over vast areas, delivering huge deluges of rain over the Far East and tropical Australia, while western parts of Latin America turn much drier than usual. This is the flip side of El Niño, although La Niña lasts for a shorter time, usually no more than a year.

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