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At https://www.aviationweather.gov on the Forecasts puldown, then the Aviation Forecasts selection, the chart opens and often shows what looks like a letter R with a tail in the lower right, in different colors. The legend does show the symbol. What does it indicate?

weather symbol

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The Info button (top right) takes you to an explanation site, which in turn links you to

https://www.AviationWeather.gov/metar/symbol

Which explains the Symbol (under the section Fog or special weather) as Thunderstorm

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  • $\begingroup$ Excellent! I guess I need to poke around there more, I hadn't even tried the Info pages at all. Thanks. $\endgroup$ – CrossRoads Jul 9 '18 at 15:09

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