Hindcast Anomaly Correlation

These maps display anomaly correlations between hindcasts of 2-meter temperature, sea surface temperature, and precipitation and observed values of the same variables at multiple leads for a selection of climate models. The range of years over which the correlation is calculated is 1982-2010 for CFSv2 and 1981-2010 for CMC1 and CMC2.

Use the drop-down menus at the top of the page to select the model, variable, and seasonal lead. Mouse over the map to select the forecast start time from the control that appears just above the map. Select a combination of the forecast start time and the 3-month seasonal lead time to produce a map for a target season of the year. The forecast starts occur at the beginning of a month of the year, and adding together the forecast start time and the lead time (3-month seasonal lead) determines the season for which the hindcast is valid.

For example, for a seasonal forecast, the combination of a forecast start time of 0000 1 Sep and a 3-month seasonal lead of 1.5 months (the first seasonal lead) will produce a correlation anomaly map for the September-November 3-month season. The combination of a forecast start time of 0000 1 Sep and a 3-month seasonal lead of 2.5 months (the second seasonal lead) will produce a correlation anomaly map for the October-December season. The target season and start time will appear at the bottom of the map -- note that the displayed year of 1960 or 1961 is not relevant -- the correlation is calculated over 1982-2010 for CFSv2 and 1981-2010 for CMC1 and CMC2.

How to use this interactive map

Return to the menu page: Click the blue link called “Portal” at the top left corner of the page.

Helpdesks

Contact help@iri.columbia.edu with any technical questions or problems with this Map Room.