To remind that the time resolution is much lower.Īccuracy details: Averaged over North America for a 30 day period: when the forecast is predicting less than 12 hours into the future, Those are shown on the charts with groups of 6 blockes linked together The far future ECMWF cloud forecasts are still usable.īut note that the furthest out forecasts may be for 6-hour blocks. So like many civil forecasts "clear sky" might still mean "some cirrus".Īccuracy Summary: The ECMWF forecast is more accurate than the CMC cloud forecast when predicting mostly clear, but less accurate when This isn't an astronomy-specific forecast. Which is different than when the CMC forecasts update. It's here for comparison with the CMC cloud cover forecast.New data becomes available around 17:00 and 05:00 local time. It's data form the "european" forecast model ECMWF. It's always wise to click on a colored block for the hour you want to observe and see if your location is close to a cloud edge.ĬMC's text page explaining this forecast is Is 76% and the mostly-cloudy accuracy is 89%. When the forecast is predicting 36 to 48 hours into the future, the mostly-clear accuracy Mostly-clear forecasts (cloud75%) have been When the forecast is clear, the sky may still be hazy, if the transparency forecast is poor.Īccuracy averaged over North America for a 30 day period: when the forecast is predicting less than 12 hours into the future, This forecast may miss low cloud and afternoon thunderstorms. Lighter shades of blue are increasing cloudiness and white is overcast.
The colors are picked from what color the sky is likely to be, with The line, labeled Cloud Cover forecasts total cloud cover. Connected blocks mean one forecast calculation for several hours. (Local time for Toronto is -4.0 hours from GMT.) Single blocks mean separate forecast data for each hour. A digit 1 on top of a 3 means 13:00 or 1pm. The two numbers at the top of a column is the time. The colors of the blocks are the colors from CMC's forecast maps for that hour. Summary: In the rows labeled "Sky", find a column of blue blocks. Summarizes CMC's forecast images just for TorontoĪnd the surroundings out to about 15 Kms. So, Attilla Danko wrote a script to generate the images like the one above It can be a chore to find the one map that tells you if you can observe tonight. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers.īut they have 1180 forecast maps. The data comes from a forecast model developed by Allan Rahill of theĬanadian Meteorological Centre. It's a prediction of when Toronto, ON, will have good weather for astronomical observing. At a glance, it shows when it will be cloudy or clear for the Please consult your device documentation for instructions.University of Toronto Atmospheric Observatory (TAO) and the On mobile devices, you can save the bookmark as an easy-access icon similar to other apps. For example, if you select "Weather for a location," then select a location, the bookmark will return to your location on your next visit. You may bookmark the URL to return later to the same view with the selected settings.
LOCAL CLOUD HEIGHT MAP NWS UPDATE
The URL will automatically update as you select the view and settings. This view is similar to a radar application on a phone that provides radar, current weather, alerts and the forecast for a location. This view combines radar station products into a single layer called a mosaic and storm based alerts.
This view provides specific radar products for a selected radar station and storm based alerts. This site is organized into views that provide relevant radar products and weather information for a common task or goal.
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