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Extreme US weather: La Niña or constipated jet stream?

17 August 2011

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TALK about extreme weather. As the east coast of the US drowns in diluvial rains, a heatwave continues to scorch Texas, killing crops and drying up reservoirs, including this one in San Angelo State Park. In Lake Nacogdoches, the drought has exposed a piece of the space shuttle Columbia, which broke apart over Texas in 2003.

Meteorologists say the drought and heatwave appear to be the lingering effects of the La Niña that lasted from last summer to last spring. In 19 out of the past 20…

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