Warm sunshine spread across the Front Range on Tuesday, and high temperatures could reach the upper 60s by Wednesday afternoon – all while a winter storm bears down for Thanksgiving night. This happens a lot in Colorado. We call it the "warm before the storm." It’s caused by a wave pattern in the jet stream, which is a river of fast-moving air just above our heads. Sometimes the jet stream takes on a very wavy pattern, and when it does, there’s usually abrupt changes in the weather underneath it. Read more: https://www.9news.com/article/weather/weather-colorado/colorado-snow-after-warm-weather-jet-stream/73-35a5892a-4a1d-4626-a7fb-69c1e20ec379 ----- More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.