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. (Local time for Seattle is -7.0 hours from GMT.) 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 conditions", find a column of blue blocks. Summarizes CMC's forecast images just for SeattleĪnd the surroundings out to about 10 miles. So, I (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 Seattle, WA, will have good weather for astronomical observing. At a glance, it shows when it will be cloudy or clear for the ![]() Home of the Seattle Astronomical Society and theīoeing Employees' Astronomical Society (BEAS).
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