Check weather for airports in direction from which storm is coming, thus allowing preview of potential weather for destination and departure airports. 
Potential sources for weather information online 
XM Weather vs. FAA Approved Weather 
Weather Briefing from FSS, DUATs, or other approved sources 
Self-briefing contents 
Practice briefings are acceptable 
Sources of NOTAMs vs. FSS vs. TFRs vs. FAA Violations 
CFIs: Give students a scenario where both departure and destination airports are VFR, but there is a cold front between the departure and destination airports