Alert archive / Colorado / Winter Storm Warnings in 2021
Winter Storm Warning 6, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm warning at Apr 19, 2021, 4:26 AM MDT for 6 counties in Colorado. It took effect at Apr 19, 2021, 12:00 PM MDT. It was in force for 15 hr. 60 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 19, 2021, 4:26 AM MDT (10:26 UTC)
- In effect from
- Apr 19, 2021, 12:00 PM MDT
- Expired
- Apr 20, 2021, 3:00 AM MDT
- In force
- 15 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Boulder County, CO, Broomfield County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO
The radar
The Denver radar (KFTG), 100 km from the middle of the area, began a volume at 10:30 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 19, 5:35 PM MDT | SNOW 2 | 4 Ene Nederland, CO | |
| Apr 19, 6:00 PM MDT | SNOW 1.4 | 3 Ssw Boulder, CO | |
| Apr 19, 6:18 PM MDT | SNOW 3 | 3 Sw Longmont, CO | |
| Apr 19, 6:40 PM MDT | SNOW 4 | 1 Ssw Crescent Village, CO | |
| Apr 19, 6:52 PM MDT | SNOW 3 | 1 Wnw Niwot, CO | |
| Apr 19, 6:54 PM MDT | SNOW 4.3 | 3 Sw Longmont, CO | CURRENTLY HEAVY SNOW WITH A RATE OF 2 INCHES PER HOUR. |
| Apr 19, 6:54 PM MDT | SNOW 7.2 | 3 Sw Longmont, CO | |
| Apr 19, 7:00 PM MDT | SNOW 3.3 | 2 Ne Longmont, CO | |
| Apr 19, 7:11 PM MDT | HEAVY SNOW 8.5 | 2 E Allenspark, CO | |
| Apr 19, 7:15 PM MDT | SNOW 3.7 | 2 Nw Fort Collins, CO | |
| Apr 19, 7:29 PM MDT | SNOW 4 | 1 Nne Longmont, CO | |
| Apr 19, 7:34 PM MDT | SNOW 4.9 | 1 Nw Niwot, CO | |
| Apr 19, 8:00 PM MDT | SNOW 6 | 3 E Horsetooth Mountain, CO | 1.5 INCHES LAST HOUR. SNOW BEGINNING TO DECREASE IN INTENSITY. |
| Apr 19, 8:03 PM MDT | SNOW 3.5 | 1 Nnw Genesee, CO | |
| Apr 19, 8:03 PM MDT | SNOW 4 | 1 N Fort Collins, CO | |
| Apr 19, 8:05 PM MDT | SNOW 10.2 | 3 W Jamestown, CO | |
| Apr 19, 8:11 PM MDT | SNOW 4.1 | 1 Nnw Louisville, CO | |
| Apr 19, 8:28 PM MDT | SNOW 3 | 3 Nw Marshall, CO | |
| Apr 19, 8:30 PM MDT | SNOW 6.5 | 3 Ssw Boulder, CO | 5.1 INCHES IN LAST 2.5 HOURS. |
| Apr 19, 8:31 PM MDT | SNOW 4.5 | 2 N Longmont, CO | |
| Apr 19, 8:48 PM MDT | SNOW 5.3 | 1 Wnw Niwot, CO | |
| Apr 19, 8:50 PM MDT | SNOW 7 | Pinewood Springs, CO | |
| Apr 19, 8:51 PM MDT | SNOW 3.6 | 2 Nw Loveland, CO | |
| Apr 19, 8:52 PM MDT | SNOW 5 | 1 Ssw Lafayette, CO | |
| Apr 19, 8:53 PM MDT | SNOW 7.5 | Boulder, CO | |
| Apr 19, 8:54 PM MDT | SNOW 9 | 2 Nw Boulder, CO | |
| Apr 19, 8:56 PM MDT | SNOW 9 | 4 Ene Nederland, CO | |
| Apr 19, 9:00 PM MDT | SNOW 3 | 2 Wnw Rabbit Ears Pass, CO | RABBIT EARS PASS SNOTEL. SWE 0.3 INCH. |
| Apr 19, 9:00 PM MDT | SNOW 3 | 8 Sse Rand, CO | WILLOW CREEK PASS SNOTEL. SWE 0.3 INCH. |
| Apr 19, 9:00 PM MDT | SNOW 5 | 11 S Rabbit Ears Pass, CO | BUFFALO PARK SNOTEL. SWE 0.5 INCH. |
| Apr 19, 9:00 PM MDT | SNOW 5 | 6 Ssw Glendevey, CO | RAWAH SNOTEL. SWE 0.3 INCH. |
| Apr 19, 9:00 PM MDT | SNOW 6 | 1 Nnw Genesee, CO | |
| Apr 19, 9:00 PM MDT | SNOW 7 | 1 E Trail Ridge, CO | WILLOW PARK SNOTEL. SWE 0.4 INCH. |
| Apr 19, 9:00 PM MDT | SNOW 10 | 3 Sw Meeker Park, CO | COPELAND LAKE SNOTEL. SWE 0.6 INCH. |
| Apr 19, 9:05 PM MDT | SNOW 5.1 | 2 Nw Fort Collins, CO | |
| Apr 19, 9:07 PM MDT | SNOW 8.4 | 2 Wsw Boulder, CO | |
| Apr 19, 9:11 PM MDT | SNOW 6.1 | 3 S Boulder, CO | |
| Apr 19, 9:17 PM MDT | SNOW 9 | 3 Ssw Boulder, CO | |
| Apr 19, 9:21 PM MDT | SNOW 4 | 4 Wnw Arvada, CO | |
| Apr 19, 9:30 PM MDT | SNOW 8 | Poudre Park, CO | COCORAHS STATION CO-LR-1245 BELLVUE 8.1 WNW. |
| Apr 19, 9:30 PM MDT | HEAVY SNOW 8.1 | 1.8 Ssw Niwot, CO | |
| Apr 19, 9:35 PM MDT | HEAVY SNOW 14 | 2 E Allenspark, CO | |
| Apr 19, 9:41 PM MDT | SNOW 6.5 | 3 S Boulder, CO | |
| Apr 19, 9:42 PM MDT | SNOW 6.5 | 3 Wnw Lafayette, CO | |
| Apr 19, 9:42 PM MDT | SNOW 7.3 | 1 Sse Boulder, CO | |
| Apr 19, 9:43 PM MDT | SNOW 5 | Superior, CO | |
| Apr 19, 9:50 PM MDT | HEAVY SNOW 8.5 | 1.9 Se Boulder, CO | |
| Apr 19, 10:00 PM MDT | HEAVY SNOW 6.8 | 3 E Horsetooth Mountain, CO | |
| Apr 19, 10:08 PM MDT | SNOW 10 | 1 S Crescent Village, CO | |
| Apr 19, 10:20 PM MDT | SNOW 7.3 | 1 Nnw Louisville, CO | |
| Apr 19, 10:55 PM MDT | SNOW 13.5 | 1 Ssw Meeker Park, CO | |
| Apr 19, 11:03 PM MDT | SNOW 4.5 | 2 Nw Loveland, CO | |
| Apr 19, 11:23 PM MDT | SNOW 4 | 3 S Fort Collins, CO | |
| Apr 19, 11:47 PM MDT | SNOW 5 | 3 Nw Columbine, CO | |
| Apr 20, 12:00 AM MDT | SNOW 8.9 | 3 Ssw Boulder, CO | NWS OFFICE. |
| Apr 20, 12:01 AM MDT | SNOW 6 | 2 Ese Ken Caryl, CO | |
| Apr 20, 12:05 AM MDT | SNOW 6 | 2 Wsw Louisville, CO | |
| Apr 20, 12:20 AM MDT | SNOW 5 | 2 N Aspen Park, CO | |
| Apr 20, 12:50 AM MDT | SNOW 5.8 | 2 Se Golden, CO | |
| Apr 20, 1:00 AM MDT | SNOW 5 | 8 Sse Rand, CO | WILLOW CREEK PASS SNOTEL. SWE 0.4 INCH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 10.4 hours before the alert went out and 204 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 12 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 2439 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
820 WWUS45 KBOU 191026 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 426 AM MDT Mon Apr 19 2021 ...HEAVY SNOW AND MUCH COLDER TEMPERATURES LATER TODAY... .Snow will develop and become heavy at times from north to south across the Front Range this afternoon, and then continue through the evening. Snowfall rates around one inch per hour can be expected along the I-25 Corridor, and up to 2 inches per hour in the Front Range Foothills. Temperatures will drop quickly, causing a possible flash freeze on roads and very slick/hazardous travel conditions. The evening commute will likely be impacted, especially by 5 pm along the I-25 Corridor, and by 3 pm in the northern foothills. COZ033-035-191830- /O.UPG.KBOU.WW.Y.0025.210419T1800Z-210420T0900Z/ /O.NEW.KBOU.WS.W.0006.210419T1800Z-210420T0900Z/ South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Glendevey, Nederland, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Cameron Pass, Estes Park, Willow Creek Pass, and Rabbit Ears Range 426 AM MDT Mon Apr 19 2021 ...WINTER STORM WARNING IN EFFECT FROM NOON TODAY TO 3 AM MDT TUESDAY... * WHAT...Heavy snow possible. Total snow accumulations of 6 to 14 inches possible within 12 hours. Winds could gust as high as 35 mph. * WHERE...Rocky Mountain National Park and the Medicine Bow Range, and The Northern Front Range Foothills. * WHEN...From Noon today to 3 AM MDT Tuesday. * IMPACTS...Travel could be very difficult. 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 && $$ COZ039-191830- /O.UPG.KBOU.WW.Y.0025.210419T2100Z-210420T0900Z/ /O.NEW.KBOU.WS.W.0006.210419T2100Z-210420T0900Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- Including the cities of Boulder, Golden, Longmont, Arvada, and Lakewood 426 AM MDT Mon Apr 19 2021 ...WINTER STORM WARNING IN EFFECT FROM 3 PM THIS AFTERNOON TO 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 5 to 8 inches, most of it within 6 to 9 hours, with locally heavier amounts near the base of the foothills. * WHERE...Boulder and the western suburbs of Denver. * WHEN...From 3 PM this afternoon to 3 AM MDT Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip. org && $$ COZ034-036-191830- /O.CON.KBOU.WW.Y.0025.210419T1800Z-210420T0900Z/ South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Including the cities of Evergreen, Georgetown, Indian Peaks, Idaho Springs, Eisenhower Tunnel, East Slopes Southern Gore Range, Mount Evans, Central City, East Slopes Mosquito Range, Breckenridge, Winter Park, Williams Fork Mountains, Bailey, Kenosha Mountains, Westcreek, and Berthoud Pass 426 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 6 to 12 inches along and north of I-70, 4 to 7 inches to the south. Lighter snow accumulations of 1 to 4 inches west of the Eisenhower Tunnel. Winds gusting as high as 35 mph. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks, and The Southern Front Range Foothills. * WHEN...From Noon today to 3 AM MDT Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ COZ038-040-041-043-191830- /O.CON.KBOU.WW.Y.0025.210419T2100Z-210420T0900Z/ Larimer County Below 6000 Feet/Northwest Weld County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet-Central and South Weld County- Including the cities of Eaton, Highlands Ranch, Castle Rock, City of Denver, Elbert, Fort Collins, Aurora, Roggen, Kiowa, Loveland, Greeley, Littleton, Nunn, Larkspur, Fort Lupton, Fondis, Hereford, Parker, Denver International Airport, and Brighton 426 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 PM THIS AFTERNOON TO 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 6 inches, with locally heavier amounts near the base of the foothills. * WHERE...Fort Collins, Denver, Castle Rock, and Greeley. * WHEN...From 3 PM this afternoon to 3 AM MDT Tuesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ For more information from the National Weather Service, visit https://weather.gov/bou Kriederman
4 follow-up statements
763 WWUS45 KBOU 191701 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 1101 AM MDT Mon Apr 19 2021 ...HEAVY SNOW AND COLD TEMPERATURES THROUGH TONIGHT... .Snow will develop and become heavy at times from north to south across the Front Range this afternoon, and then continue through the evening. Snowfall rates around one inch per hour can be expected along the I-25 Corridor, and up to 2 inches per hour in the Front Range Foothills. Temperatures will be cold, causing a possible flash freeze on roads and very slick/hazardous travel conditions. The evening commute will likely be impacted, especially by 5 pm along the I-25 Corridor, and by 3 pm in the northern foothills. COZ033-035-200300- /O.CON.KBOU.WS.W.0006.210419T1800Z-210420T0900Z/ South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Glendevey, Nederland, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Cameron Pass, Estes Park, Willow Creek Pass, and Rabbit Ears Range 1101 AM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Heavy snow possible. Total snow accumulations of 6 to 14 inches possible within 12 hours. Winds could gust as high as 35 mph. * WHERE...Rocky Mountain National Park and the Medicine Bow Range, and The Northern Front Range Foothills. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ COZ039-200300- /O.CON.KBOU.WS.W.0006.210419T2100Z-210420T0900Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- Including the cities of Boulder, Golden, Longmont, Arvada, and Lakewood 1101 AM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 3 PM THIS AFTERNOON TO 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 5 to 8 inches, most of it within 6 to 9 hours, with locally heavier amounts near the base of the foothills. * WHERE...Boulder and the western suburbs of Denver. * WHEN...From 3 PM this afternoon to 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Travel could be very difficult. The hazardous conditions will impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ COZ042-044>046-048>051-200300- /O.EXA.KBOU.WW.Y.0025.210419T2100Z-210420T0900Z/ 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 1101 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches. Winds gusting as high as 35 mph. * WHERE...Portions of east central and northeast Colorado. * WHEN...From 3 PM this afternoon to 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ COZ034-036-200300- /O.CON.KBOU.WW.Y.0025.210419T1800Z-210420T0900Z/ South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Including the cities of Evergreen, Georgetown, Indian Peaks, Idaho Springs, Eisenhower Tunnel, East Slopes Southern Gore Range, Mount Evans, Central City, East Slopes Mosquito Range, Breckenridge, Winter Park, Williams Fork Mountains, Bailey, Kenosha Mountains, Westcreek, and Berthoud Pass 1101 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 6 to 12 inches along and north of I-70, 4 to 7 inches to the south. Lighter snow accumulations of 1 to 4 inches west of the Eisenhower Tunnel. Winds gusting as high as 35 mph. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks, and The Southern Front Range Foothills. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Travel could be very difficult. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ COZ038-040-041-043-200300- /O.CON.KBOU.WW.Y.0025.210419T2100Z-210420T0900Z/ Larimer County Below 6000 Feet/Northwest Weld 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 Eaton, Highlands Ranch, Castle Rock, City of Denver, Elbert, Fort Collins, Aurora, Roggen, Kiowa, Loveland, Greeley, Littleton, Nunn, Larkspur, Fort Lupton, Fondis, Hereford, Parker, Denver International Airport, and Brighton 1101 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 PM THIS AFTERNOON TO 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 6 inches, with locally heavier amounts near the base of the foothills. * WHERE...Fort Collins, Denver, Castle Rock, and Greeley. * WHEN...From 3 PM this afternoon to 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Plan on slippery road conditions. The hazardous conditions will impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ For more information from the National Weather Service, visit https://weather.gov/bou Meier
249 WWUS45 KBOU 200114 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 714 PM MDT Mon Apr 19 2021 ...HEAVY SNOW AND COLD TEMPERATURES THROUGH TONIGHT... .Snow will be heavy at times this evening, and then slowly decrease from north to south by midnight. Snowfall rates will be as high as 1 to 2 inches per hour this evening, with slick and hazardous travel conditions. Snow will gradually come to an end overnight, but slick spots will remain for the Tuesday morning commute. COZ033-035-200900- /O.CON.KBOU.WS.W.0006.000000T0000Z-210420T0900Z/ South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Glendevey, Nederland, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Cameron Pass, Estes Park, Willow Creek Pass, and Rabbit Ears Range 714 PM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Heavy snow possible. Total snow accumulations of 6 to 12 inches possible within 12 hours. * WHERE...Rocky Mountain National Park and the Medicine Bow Range, and The Northern Front Range Foothills. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip. org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ039-200900- /O.CON.KBOU.WS.W.0006.000000T0000Z-210420T0900Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- Including the cities of Boulder, Golden, Longmont, Arvada, and Lakewood 714 PM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 5 to 9 inches. * WHERE...Boulder and the western suburbs of Denver. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. 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 Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ034-036-200900- /O.CON.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Including the cities of Evergreen, Georgetown, Indian Peaks, Idaho Springs, Eisenhower Tunnel, East Slopes Southern Gore Range, Mount Evans, Central City, East Slopes Mosquito Range, Breckenridge, Winter Park, Williams Fork Mountains, Bailey, Kenosha Mountains, Westcreek, and Berthoud Pass 714 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 6 to 11 inches along and north of I-70, 4 to 7 inches to the south. Lighter snow accumulations of 1 to 4 inches west of the Eisenhower Tunnel. Winds gusting as high as 35 mph. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks, and The Southern Front Range Foothills. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ038-040-041-043-200900- /O.CON.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ Larimer County Below 6000 Feet/Northwest Weld 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 Eaton, Highlands Ranch, Castle Rock, City of Denver, Elbert, Fort Collins, Aurora, Roggen, Kiowa, Loveland, Greeley, Littleton, Nunn, Larkspur, Fort Lupton, Fondis, Hereford, Parker, Denver International Airport, and Brighton 714 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 6 inches. * WHERE...Fort Collins, Denver, Castle Rock, and Greeley. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ042-044>046-048>051-200900- /O.CON.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ Northeast Weld County-Morgan County-Central and East Adams and Arapahoe Counties-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Logan County-Washington County- Sedgwick County-Phillips County- Including the cities of Wiggins, Fort Morgan, Hugo, Otis, Julesburg, Sedgwick, Briggsdale, Leader, Sterling, Pawnee Buttes, Cope, Akron, Raymer, Amherst, Ovid, Matheson, Peetz, Grover, Deer Trail, Byers, Agate, Haxtun, Last Chance, Goodrich, Stoneham, Bennett, Crook, Holyoke, Brush, Limon, and Merino 714 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches, heaviest south of Highway 34. Winds gusting as high as 25 mph. * WHERE...Portions of east central and northeast Colorado. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Barjenbruch
731 WWUS45 KBOU 200337 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 937 PM MDT Mon Apr 19 2021 ...HEAVY SNOW WINDS DOWN TONIGHT... .Snow will slowly decrease and come to an end from north to south across northeast and north central Colorado overnight. Roads will be snow covered in most spots, with slick and hazardous travel conditions. Slick spots will remain for the Tuesday morning commute, so allow extra time to reach your destination safely. COZ033-035-200900- /O.CON.KBOU.WS.W.0006.000000T0000Z-210420T0900Z/ South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Glendevey, Nederland, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Cameron Pass, Estes Park, Willow Creek Pass, and Rabbit Ears Range 937 PM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Heavy snow ending overnight. Total snow accumulations of 6 to 12 inches, with up to 15 inches in the foothills of Boulder County. * WHERE...Rocky Mountain National Park and the Medicine Bow Range, and The Northern Front Range Foothills. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Travel could be very difficult. 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 Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ039-200900- /O.CON.KBOU.WS.W.0006.000000T0000Z-210420T0900Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- Including the cities of Boulder, Golden, Longmont, Arvada, and Lakewood 937 PM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Heavy snow ending overnight Total snow accumulations of 5 to 9 inches, with up to 12 inches in parts of Boulder. * WHERE...Boulder and the western suburbs of Denver. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip. org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ034-036-200900- /O.CON.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Including the cities of Evergreen, Georgetown, Indian Peaks, Idaho Springs, Eisenhower Tunnel, East Slopes Southern Gore Range, Mount Evans, Central City, East Slopes Mosquito Range, Breckenridge, Winter Park, Williams Fork Mountains, Bailey, Kenosha Mountains, Westcreek, and Berthoud Pass 937 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow ongoing. Total snow accumulations of 6 to 11 inches along and north of I-70, 4 to 7 inches to the south. Lighter snow accumulations of 1 to 4 inches west of the Eisenhower Tunnel. Winds gusting as high as 35 mph. * WHERE...The Mountains of Summit County, the Mosquito Range, and the Indian Peaks, and The Southern Front Range Foothills. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ038-040-041-043-200900- /O.CON.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ Larimer County Below 6000 Feet/Northwest Weld County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet-Central and South Weld County- Including the cities of Eaton, Highlands Ranch, Castle Rock, City of Denver, Elbert, Fort Collins, Aurora, Roggen, Kiowa, Loveland, Greeley, Littleton, Nunn, Larkspur, Fort Lupton, Fondis, Hereford, Parker, Denver International Airport, and Brighton 937 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow ongoing. Total snow accumulations of 3 to 6 inches. * WHERE...Fort Collins, Denver, Castle Rock, and Greeley. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ COZ042-044>046-048>051-200900- /O.CON.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ 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 937 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Snow ongoing. Total snow accumulations of 2 to 5 inches, heaviest south of Highway 34. * WHERE...Portions of east central and northeast Colorado. * WHEN...Until 3 AM MDT Tuesday. * IMPACTS...Snow covered roads will make travel hazardous. Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org Roads will be slick resulting in slow and hazardous travel. Allow extra time to reach your destination. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Barjenbruch
424 WWUS45 KBOU 200857 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 257 AM MDT Tue Apr 20 2021 COZ033-035-201000- /O.CAN.KBOU.WS.W.0006.000000T0000Z-210420T0900Z/ South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Glendevey, Nederland, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Cameron Pass, Estes Park, Willow Creek Pass, and Rabbit Ears Range 257 AM MDT Tue Apr 20 2021 ...WINTER STORM WARNING IS CANCELLED... Snow has ended, though a few flurries may still occur early this morning. $$ COZ039-201000- /O.EXP.KBOU.WS.W.0006.000000T0000Z-210420T0900Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- Including the cities of Boulder, Golden, Longmont, Arvada, and Lakewood 257 AM MDT Tue Apr 20 2021 ...WINTER STORM WARNING WILL EXPIRE AT 3 AM MDT EARLY THIS MORNING... Heavy snow has ended, though a few flurries may still occur for the next couple of hours, with little to no additional accumulation expected. $$ COZ034-036-038-040-041-043-201000- /O.CAN.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet-Central and South Weld County- Including the cities of Eaton, Elbert, Westcreek, Roggen, Central City, Breckenridge, Larkspur, Bailey, Williams Fork Mountains, Evergreen, Georgetown, Indian Peaks, City of Denver, Aurora, East Slopes Southern Gore Range, Mount Evans, Littleton, East Slopes Mosquito Range, Berthoud Pass, Brighton, Highlands Ranch, Fort Lupton, Loveland, Kiowa, Kenosha Mountains, Winter Park, Fondis, Denver International Airport, Parker, Castle Rock, Fort Collins, Greeley, Nunn, Idaho Springs, Hereford, and Eisenhower Tunnel 257 AM MDT Tue Apr 20 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Heavy snow has ended, though a few flurries may still occur for the next couple of hours, with little to no additional accumulation expected. $$ COZ042-044>046-048>051-201000- /O.EXP.KBOU.WW.Y.0025.000000T0000Z-210420T0900Z/ 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 257 AM MDT Tue Apr 20 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 3 AM MDT EARLY THIS MORNING... Heavy snow has ended, though a few flurries may still occur for the next couple of hours, with little to no additional accumulation expected. $$ For more information from the National Weather Service, visit https://weather.gov/bou Kriederman
Nearby
Winter Storm Warnings in Colorado, 2021Every winter storm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.