The claim addresses whether snow and precipitation formation relies primarily on transported moisture versus local sources. Several studies on precipitation and extreme events (e.g., in Greenland, Sichuan, and general atmospheric rivers) emphasize distant moisture transport and remote evaporation sources. However, regional studies like those in Xinjiang and the Tianshan Mountains show that local and regional continental evaporation can contribute the majority of moisture during certain seasons (such as summer). Since the relative importance of transported versus local moisture is highly dependent on geographic location, climatological regime, and season, the evidence points to a CONTESTED balance rather than a universal rule.