ENSO El Niño Southern Oscillation Pages 484-487. NORMAL conditions  Trade Winds  Cool water pools near S.America,  Warm water pools near Australia.

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Presentation transcript:

ENSO El Niño Southern Oscillation Pages

NORMAL conditions  Trade Winds  Cool water pools near S.America,  Warm water pools near Australia

El Nino Warning System Sea Surface Temperature Wind Speed/Direction Ocean Current Direction

EL NINO

How are “El Niño” conditions different?  Ocean currents reverses  Warm water pools near S.America  Cool water pools near Australia

How does El Nino affect weather in… South America? Australia? Northern US? Southern US? Typhoons?

Global Effects of El Nino  S. America- more rain; warmer  Floods/mudslides  Australia- dry; cooler  Less typhoons  Kills anchovies in Peru ( how El Nino was first discovered)

El Nino’s effect on the United States  Warmer winters/ drier in N states Wet/colder  Wet/colder winters in S states

“LA NINA”  Cool phase of ENSO (neg. phase)  Trade winds intensify

La Nina

How does La Nina affect weather in… South America? Australia? Northern US? Southern US? Hurricanes?

South America- drier/colder Australia- wetter/warmer N. US- Colder than normal winters »Increased snowfall More hurricanes S. US- warmer/drier La Nina’s effects

Predictable?

El Nino or La Nina?

winter forecast (as of Oct. 2012)

El Nino or La Nina?

Winter 2012 normal2012 Plus el Nino

Helpful Websites TAO ~ Tropical Atmosphere Ocean project The TAO Story /mainDOC.html

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