Wednesday, January 12, 2011

What a change to see a tropical-like tree. Tropical monsoon and massive rainfall have struck northern areas. Our weather and El Nino Southern Oscillation go together.
When the Pacific Ocean in the far distant tropics around central America is warm - that is El Nino - it is associated with dry weather and years of drought around  Australia. This situation alternates with La Nina which brings clouds and rainfall to eastern Australia when the conditions reverse.
Ocean currents, trade winds and the Walker Circulation are part of this vast system over the Pacific from one sideof the ocean to the other and include, I think, the Indian Ocean.
When do extreme weather events change from variations and become so far out of ordinary to become climate change?

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