Hourly Forecast Maps


Forecast Model
Map Area
Variable
Initialization
Image Slider

Overview

This interface is for viewing weather forecasts from NOAA/NCEP numerical models. Select Forecast Model, Map Area, Variable, and Initialization from the pulldown menus above to view different forecasts. Use the Image Slider or playback controls to animate. See forecast period, output interval, and initialization times available for each model:

Global Forecast System (GFS)
10-day fcst  /  3-hourly  /  00,06,12,18 Z
North American Mesoscale (NAM)
2.5-day fcst  /  1-hourly  /  00,06,12,18 Z
North American Mesoscale [Alaska] (NAM)
2.5-day fcst  /  1-hourly  /  00,12 Z
High Resolution Rapid Refresh (HRRR)
18/36-hour fcst  /  1-hourly  /  00-21 Z every 3 hours
Air Quality Model (AQM)
48-hour fcst  /  1-hourly  /  06,12 Z
Real-Time Ocean Forecast System (RTOFS)
8-day fcst  /  3-hourly  /  00 Z

Source model output is downloaded from the NOAA Operational Model Archive and Distribution System. Forecast maps on this page are generated using NCAR Command Language (NCL). These visualizations are for educational purposes. Always refer to official guidance from the National Weather Service and NOAA for decision making during severe weather.

Additional Information

2m Temperature refers to air temperature at 2 meters above the surface. 2m Temperature Anomaly refers to the departure of the current day (or hour) forecasted temperature from a long-term mean for the same day (and hour) 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 rapid Arctic warming and sea-ice loss. A comparison of different climate baselines against the historical temperature record is shown here.

Temperature anomalies calculated between GFS (forecast) and CFSR (reanalysis) will differ somewhat from those calculated entirely within the Climate Forecast System framework (see this NCEP/NWS discussion on model bias). For the most reliable temperature anomaly estimates, refer to the Daily Reanalysis Maps page. The image archive is updated once or twice per month.