The Climate Prediction Center (CPC) has issued an El Niño Advisory, which may be viewed here. Over the past few months, conditions in the Equatorial Pacific have changed dramatically, from unusually cool water temperatures to warmer than normal temperatures. This rapid change in Sea Surface Temperatures indicates the likelihood that an El Niño will persist into the upcoming winter.
Typical impacts of an El Niño on our region include warmer than normal winter weather, with less snow than normal. There is always quite a bit of variability in winter weather, even during El Niño years, and other factors come into play that can cause significant monthly variations. As we get closer to the fall and winter season of 2009/2010, your NOAA's National Weather Service will update you on this developing climate event.