Here you can find various aviation resources to help you with your flight planning and weather analysis.
Aviation/Weather Education
Part Time Pilot
online ground school
-- Part Time Pilot is by far the best online ground school out there. Catered toward busy people like me who benefit from learning at their own pace, Part Time Pilot was the perfect blend of formats to help me get a 97% on my PPL written exam. With content available as audio, video, browser, and a mobile app, I always had a way to keep learning, no matter where I found myself. Nick (FAA Ground Instructor) puts out fantastic educational content, and he whetted my appetite for all things aviation weather. Thanks Nick!
Weather Theory (FAA)
-- Pilot's Handbook of Aeronautical Knowledge (PHAK) chapter 12
Aviation Weather Center (NWS)
-- If a forecast is available, pilots should prefer that over historical trend data. This is a fantastic source of aviation weather observations and forecasts, from the National Weather Service.