Over the span of days or weeks, the strength of surface air pressure over the North Atlantic seesaws between Iceland and the Azores Islands. The shifting pressure reflects changes in atmospheric circulation that have a big impact on mid-latitude weather in the U.S. and Europe. 

The Arctic Oscillation (AO) refers to an atmospheric circulation pattern over the mid-to-high latitudes of the Northern Hemisphere. The most obvious reflection of the phase of this oscillation is the north-to-south location of the storm-steering, mid-latitude jet stream.

How El Niño is like different flavors of ice cream.  Seriously.

June 2009 SST anomalies

As of late August 2014, tropical atmospheric temperatures appear to be responding more strongly to the ocean than they typically do at this early stage of El Niño development.   

Along with ENSO, what other climate patterns might be useful for predicting temperatures and precipitation in the United States?

OLR anomalies in 2012 versus 2014

Where is El Niño?  How is this year different from 2012 when El Niño was predicted, but never arrived?  

June 2014 SST anomalies

Why hasn't El Niño been declared yet?  The answer might lie in the gradients of sea surface temperatures across the tropical Pacific Ocean.  

Activity in which students investigate what causes the seasons by doing a series of kinesthetic modeling activities and readings. Activity includes educator background information about how to address common misconceptions about the seasons with students.

This webinar will examine how variations in the tropical Pacific can affect high-latitude regions such as Alaska.

U.S. Climate Normals

Discover easy access to 30-year Climate Normals for temperature and precipitation from stations across the country. This tool generates graphs for montlhy temperature and precipitation Climate Normals, and provides tabular data for hourly, daily, monthly, seasonal, and annual periods.

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