Today's Weather Maps

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Data Sources & Additional Information

  • Weather maps on this page depict output from the operational NOAA Global Forecast System (GFS) model. GFS utilizes a 13 km Finite-Volume Cubed-Sphere dynamical core (FV3) to produce 16-day forecasts 4x daily. The maps here are generated using NCAR Command Language (NCL). Daily means are calculated from eight 3-hourly timeslices beginning 0000 UTC. Source GFS files are downloaded from NOMADS.

  • 2m Temperature refers to air temperature at 2 meters above the surface. 2m Temperature Anomaly refers to the departure of the current day's forecasted temperature from a long-term mean for the same day of the year. The anomalies here are based on a 1979-2000 reference climatology derived from the NCEP Climate Forecast System Reanalysis (CFSR). This 22-year baseline is used instead of the more common 1981-2010 climate normal because 1979-2000 represents conditions prior to significant Arctic warming and sea-ice loss. A comparison of different climate baselines against the historical temperature record is shown here.

  • The daily temperature anomaly values shown on these maps reflect current weather patterns, and therefore global and regional means can vary significantly from day-to-day and week-to-week. Climate trends should only be inferred from long-term datasets. Refer to NOAA's Climate at a Glance for monthly, seasonal, and annual global temperature change since 1880. Reanalysis and gridded data products can also be accessed on Climate Reanalyzer's Monthly Reanalysis Timeseries page.

  • Temperature anomalies calculated between GFS (forecast) and CFSR (reanalysis) may differ from those calculated entirely within the Climate Forecast System framework (see this NCEP/NWS discussion on model bias). CFS/CFSR daily temperature anomaly estimates are available with a few days lag on the Daily Reanalysis Maps page.

  • Sea Surface Temperature (SST) and SST anomaly maps are generated from NOAA Optimum Interpolation SST version 2 (OISST V2). OISST is a 0.25° gridded dataset derived by blending satellite, ship, and buoy measurements. The SST anomalies is based on a 1971-2000 climatology calculated by NOAA.

  • The regional values shown at the bottom of the 2m temperature and SST anomaly maps are area-weight averages of the following domains:
    90°S-90°N, 0-360°E
    Northern Hemisphere
    0-90°N, 0-360°E
    Southern Hemisphere
    90°S-0, 0-360°E
    65°N-90°N, 0-360°E
    90°S-65°S, 0-360°E
    25°S-25°N, 0-360°E
    North Atlantic
    5°N-65°N, 280°E-360°E
    North Pacific
    0-60°N, 130°E-260°E
    Equatorial Pacific
    15°S-15°N, 140°E-290°E

Last updated 5/23/2022