ENSO El Niño Southern Oscillation Pages 484-487
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
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 winters in S states
“LA NINA” • Cool phase of ENSO (neg. phase) • Trade winds intensify
How does La Nina affect weather in… • South America? • Australia? • Northern US? • Southern US? • Hurricanes?
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
Winter 2012 normal 2012 Plus el Nino
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