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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. EL NINO. - PowerPoint PPT Presentation
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ENSO
El Niño Southern Oscillation
Pages 484-487
NORMAL conditionsNORMAL conditionsTrade WindsCool water pools near S.America,Warm water pools near Australia
El Nino Warning SystemEl Nino Warning System
• Sea Surface Temperature
•Wind Speed/Direction
•Ocean Current Direction
EL NINO
How are “El Niño” conditions different?
Ocean currents reversesWarm water pools near S.AmericaCool 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; warmerFloods/mudslides
Australia- dry; coolerLess typhoonsKills 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?
2012-2013 winter forecast(as of Oct. 2012)
El Nino or La Nina?
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
