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ENSO

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  1. ENSO El Niño Southern Oscillation Pages 484-487

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

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

  4. EL NINO

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

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

  7. 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)

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

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

  10. La Nina

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

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

  13. Predictable?

  14. El Nino or La Nina?

  15. 2012-2013 winter forecast(as of Oct. 2012)

  16. El Nino or La Nina?

  17. Winter 2012 normal 2012 Plus el Nino

  18. Helpful Websites • TAO ~ Tropical Atmosphere Ocean project http://www.pmel.noaa.gov/tao/index.shtml • The TAO Story http://www.pmel.noaa.gov/tao/proj_over/flash/mainDOC.html