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Weather Depiction symbology help

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Weather

Can anyone tell me what the "SF 00/13z15/WXDPN/RW4" mean on a weather depiction chart? It's located right above the key that explains what the shaded areas are. So far I've got Surface 00/13 zulu on the 15th day/weather depiction chart. What I can't figure out is the "RW4" any ideas?  

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  1. jay2712 on Feb 16, 2018

    According to 00-45G, the Aviation Weather Services circular, RW would indicate rain.

    Not sure what the number 4 means. Hopefully someone else will weigh in on that one.

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