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Vox Sciurorum
07-14-2013, 05:19 PM
NWS has a point forecast for Mount Washington summit that includes relative humidity. Is it reasonable to expect the summit to be in the clouds when the forecast humidity is near 100%, and mostly in the clear if it's under 80-90%? (After compensating for the tendency of the computer model to predict highs in the 70s in the long range forecast, which leads to some unrealistically low RH prediction.)

Bill O
07-15-2013, 08:06 AM
I would expect clouds with RH quite a bit below 100%. The point forecast doesn't take into account other factors that help clouds form on mountain tops.

Best bet is to watch those point forecasts and compare to actual conditions to get a good idea of how the models really perform.