A major pre-Thanksgiving travel nightmare is unfolding as a powerful blizzard, dense fog, and widespread disruptions threaten to impact millions of travelers across the United States. Weather forecasters are issuing urgent warnings as a potent northern-tier storm is expected to intensify into a full-blown blizzard, stretching from Minnesota to northern Michigan. This intense weather system will bring whiteout conditions and widespread road closures, making travel exceedingly dangerous.