WeatherExtreme Forecast Discussion July 31, 2017 0650Z

Monday and Tuesday should be generally favorable for wave flying. There may be high overcast at FL300, but otherwise generally cloud-free at lower levels. Some waves should be present each, but vertical velocities will not be as great as previously forecast and will be in the range of 600–1200 fps below FL 200. Winds aloft will be from the west-southwest on Monday, becoming more westerly on Tuesday. It may be difficult to find vertical velocities above 800 fps on Tuesday above FL 180 as the waves propagate eastward and dissipate.

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