WWUS45 KBOU 112129 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 229 PM MST Thu Mar 11 2021 ...POWERFUL WINTER STORM ON TRACK FOR THIS WEEKEND... .A significant late season winter storm will move across the Desert Southwest Friday to near the Four Corners region by Saturday, and then track east/northeast across southeast Colorado Sunday. This track will bring significant snowfall to much of northeast and north central Colorado, and likely result in difficult if not impossible travel from Saturday afternoon through Sunday and Sunday night. The most severe conditions from deep accumulating snow will likely occur in and near the Front Range Mountains and Foothills where 2 to 4 feet of snow may fall, and along the I-25 Urban Corridor where up to 2 feet of snow can be expected. Temperatures will be warm enough to bring a mix of rain and snow to areas east of a Greeley to Limon line Saturday into Saturday evening, but temperatures should turn cold enough there Saturday night into Sunday for mostly snow. Winds are also expected to increase by Sunday, with blowing and drifting snow developing across the plains. COZ033>036-121200- /O.UPG.KBOU.WS.A.0001.210313T0000Z-210315T1200Z/ /O.NEW.KBOU.WS.W.0004.210313T0700Z-210315T1200Z/ South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Including the cities of Winter Park, Westcreek, Rocky Mountain National Park, Central City, Red Feather Lakes, Breckenridge, Bailey, Williams Fork Mountains, Evergreen, Georgetown, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, East Slopes Southern Gore Range, Mount Evans, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Kenosha Mountains, Estes Park, Willow Creek Pass, Laramie and Medicine Bow Mountains, Idaho Springs, and Rabbit Ears Range 229 PM MST Thu Mar 11 2021 ...WINTER STORM WARNING IN EFFECT FROM MIDNIGHT MST FRIDAY NIGHT TO 6 AM MDT MONDAY... * WHAT...Heavy snow. Total snow accumulations of 2 to 4 feet possible, except 10 to 20 inches possible west of the Eisenhower Tunnel. Winds could gust as high as 35 mph. * WHERE...Rocky Mountain National Park and the Medicine Bow Range, The Mountains of Summit County, the Mosquito Range, and the Indian Peaks, The Northern Front Range Foothills, and The Southern Front Range Foothills. * WHEN...From Midnight MST Friday Night to 6 AM MDT Monday. * IMPACTS...Travel could be impossible due to the depth of the accumulating snow. * ADDITIONAL DETAILS...Finish preparations for this storm by Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip. org && $$ COZ038>041-043-121200- /O.UPG.KBOU.WS.A.0001.210313T0700Z-210315T1200Z/ /O.NEW.KBOU.WS.W.0004.210313T1200Z-210315T1200Z/ Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet-Central and South Weld County- Including the cities of Elbert, Roggen, Arvada, Larkspur, Boulder, City of Denver, Aurora, Littleton, Brighton, Highlands Ranch, Fort Lupton, Loveland, Kiowa, Eaton, Longmont, Fondis, Denver International Airport, Golden, Parker, Castle Rock, Lakewood, Fort Collins, Greeley, Nunn, and Hereford 229 PM MST Thu Mar 11 2021 ...WINTER STORM WARNING IN EFFECT FROM 5 AM MST SATURDAY TO 6 AM MDT MONDAY... * WHAT...Heavy snow possible. Total snow accumulations of 14 to 24 inches possible. Accumulations up to 30 inches possible near Boulder and Fort Collins. Winds could gust as high as 35 mph. * WHERE...Fort Collins, Boulder and the western suburbs of Denver, Denver, Castle Rock, and Greeley. * WHEN...From 5 AM MST Saturday to 6 AM MDT Monday. * IMPACTS...Travel could be very difficult to impossible. * ADDITIONAL DETAILS...Finish preparation for this storm by Friday. Conditions will likely deteriorate quickly Saturday as the storm arrives. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip. org && $$ COZ042-044>046-048>051-121200- /O.CON.KBOU.WS.A.0001.210313T0700Z-210315T1200Z/ Northeast Weld County-Morgan County-Central and East Adams and Arapahoe Counties-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Logan County-Washington County- Sedgwick County-Phillips County- Including the cities of Wiggins, Fort Morgan, Hugo, Otis, Julesburg, Sedgwick, Briggsdale, Leader, Sterling, Pawnee Buttes, Cope, Akron, Raymer, Amherst, Ovid, Matheson, Peetz, Grover, Deer Trail, Byers, Agate, Haxtun, Last Chance, Goodrich, Stoneham, Bennett, Crook, Holyoke, Brush, Limon, and Merino 229 PM MST Thu Mar 11 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE FRIDAY NIGHT THROUGH LATE SUNDAY NIGHT... * WHAT...Heavy snow possible, but it will also be mixed with rain at times. Total snow accumulations of 4 to 16 inches possible, with the heaviest amounts possible west of a Sterling to Limon line. The far eastern plains may end up with mostly rain. Winds could gust as high as 40 mph. * WHERE...Portions of east central and northeast Colorado. * WHEN...From late Friday night through late Sunday night. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation, as the rain/snow transition will be key to snow accumulation forecasts. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Barjenbruch