GCM Forecast Seasonal Anomaly

These maps display anomaly values of forecast 2-meter temperature, sea surface temperature, and precipitation at multiple leads for a selection of climate models. The climatological base period 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 monthly or seasonal lead. Mouse over the map to select the forecast start time from a control that appears just above the map. Select a combination of the forecast start time and the monthly or 3-month seasonal lead time to produce a map for a target month or season. Use the Timescale drop-down menu to select the monthly or seasonal forecast timescale. The forecast starts occur at the beginning of a month, and adding together the forecast start time and the lead time (monthly or 3-month seasonal lead) determines the month or season for which the forecast is valid.

For example, the combination of a forecast start time of 0000 1 Sep 2015 and a monthly lead time of 0.5 months (the first monthly lead) will produce a forecast map valid for the month of September 2015. For a seasonal forecast, the combination of a forecast start time of 0000 1 Sep 2015 and a 3-month seasonal lead of 1.5 months (the first seasonal lead) will produce a forecast map valid for the September-November 2015 3-month season. The combination of a forecast start time of 0000 1 Sep 2015 and a 3-month seasonal lead of 2.5 months (the second seasonal lead) will produce a forecast map valid for the October-December 2015 season. The forecast target time and start time will appear at the bottom of the map.

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.