WeatherExtreme Forecast Discussion 8/19/2017 0455Z

Short window open Saturday between storms. Clouds possible near FL150 early Saturday afternoon, lowering and thickening to a possible FL85 to FL115 layer. Surface winds westerly during the afternoon. Wave looks best between 16Z and 18Z, with mountain wave possibly extending up to secondary wave. The core of the 200+ kt polar jet is just north of El Calafate. Wednesday still looks like the next flying day, with storminess returning Thursday

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