Thanks for the suggestions everyone.

Ken, that's the site I tend to use also. In the last year though, I've cancelled two hikes where the weather ended up not being an issue. I've been trying to find a better site and have started looking at mountain-forecast.com also. At this point I have no idea how accurate it is.

Forecast.gov and mountain-forecast.com are giving quite different forecasts for White Mtn Peak:

http://www.mountain-forecast.com/peaks/White-Mountain-Peak/forecasts/4342

http://forecast.weather.gov/MapClick.php?lon=-118.25537&lat=37.63341#.U8fnmPldW1e

HikingGeek.com