A meteorologist friend of mine confirms this. But don't believe him (and
certainly don't believe Tim), check out the sources direct:
El Nino Southern Oscillation (ENSO) Diagnostic Advisory, 97/4, issued June
States that observed temperature patterns this year are consistent with the
El Nino effect.
El Nino theme page:
Chok-a-block with color graphs and animations, and links to buoy data.
Describes what is considered to be an El Nino.