Alert archive / Colorado / Winter Storm Warnings in 2021
Winter Storm Warning 3, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm warning at Feb 24, 2021, 10:19 PM MST for 7 counties in Colorado. It was in force for 10 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
- Feb 24, 2021, 10:19 PM MST (05:19 UTC)
- Expired
- Feb 25, 2021, 8:00 AM MST
- In force
- 10 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 29 km from the middle of the area, began a volume at 05:16 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 |
|---|---|---|---|
| Feb 24, 10:19 PM MST | SNOW 7 | 2 Nw Golden, CO | STILL SNOWING. |
| Feb 24, 10:26 PM MST | SNOW 6.8 | 1 Sw Westminster, CO | |
| Feb 24, 10:28 PM MST | SNOW 7.8 | 1 Nnw Louisville, CO | |
| Feb 24, 10:30 PM MST | SNOW 5.3 | 2 E Denver, CO | 2.2 INCHES FELL IN THE PREVIOUS HOUR. UPDATES THE PREVIOUS REPORT AT 2E DENVER. |
| Feb 24, 10:36 PM MST | SNOW 6.7 | 3 Nnw Marshall, CO | |
| Feb 24, 10:49 PM MST | SNOW 8.4 | 3 Nne Northglenn, CO | STILL SNOWING AT THE TIME OF THE REPORT. |
| Feb 24, 10:50 PM MST | SNOW 8.3 | 2 Nw Golden, CO | UPDATE TO THE PREVIOUS REPORT 2NW GOLDEN. STORM TOTAL 8.25 INCHES, STILL SNOWING AT THE TIME OF THE REPORT. APPROXIMATELY 1.25 INCHES FELL IN THE LAST 40 MINUTES. |
| Feb 24, 10:51 PM MST | SNOW 4 | 2 Sw Lone Tree, CO | |
| Feb 24, 10:51 PM MST | SNOW 7.5 | 3 Ene Arvada, CO | |
| Feb 24, 11:04 PM MST | SNOW 9 | 2 Sw Niwot, CO | REPORT VIA TWITTER. |
| Feb 24, 11:08 PM MST | SNOW 5.5 | 2 Nnw Golden, CO | |
| Feb 24, 11:13 PM MST | SNOW 7.5 | Englewood, CO | |
| Feb 24, 11:26 PM MST | SNOW 7.1 | 1 Nnw Pleasant View, CO | 1.3 INCHES IN THE PAST HOUR. |
| Feb 24, 11:30 PM MST | SNOW 8 | 1 Ese Mountain View, CO | 3 INCHES IN THE PAST 2 HOURS. |
| Feb 24, 11:40 PM MST | SNOW 6.5 | Aurora, CO | |
| Feb 25, 12:00 AM MST | SNOW 7.1 | 1 W Wheat Ridge, CO | |
| Feb 25, 12:05 AM MST | SNOW 8.2 | 2 E Denver, CO | |
| Feb 25, 12:07 AM MST | SNOW 7.7 | 2 N Aspen Park, CO | |
| Feb 25, 12:25 AM MST | SNOW 9.2 | 2 Wsw Louisville, CO | |
| Feb 25, 12:40 AM MST | SNOW 7.2 | 3 Sw Aurora, CO | |
| Feb 25, 1:04 AM MST | SNOW 8 | 2 S Greenwood Village, CO | |
| Feb 25, 1:15 AM MST | SNOW 9.8 | Federal Heights, CO | |
| Feb 25, 1:17 AM MST | SNOW 10.8 | 1 Ese Thornton, CO | |
| Feb 25, 1:38 AM MST | SNOW 3.7 | 1 Nne Evergreen, CO | |
| Feb 25, 2:09 AM MST | SNOW 7.2 | 2 Wsw Foxfield, CO | |
| Feb 25, 2:30 AM MST | SNOW 12.8 | 1 Nne Highlands Ranch, CO | PHOTO SHARED VIA FACEBOOK. |
| Feb 25, 3:00 AM MST | SNOW 8.5 | 2 E Broomfield, CO | |
| Feb 25, 3:19 AM MST | SNOW 10.5 | 2 Ne Arvada, CO | STILL SNOWING AT TIME OF REPORT. |
| Feb 25, 3:41 AM MST | SNOW 2 | 1 Nnw Castle Rock, CO | |
| Feb 25, 4:15 AM MST | SNOW 9.4 | 1 Nnw Louisville, CO | |
| Feb 25, 4:21 AM MST | SNOW 3.5 | 2 Nne Shaffers Crossing, CO | |
| Feb 25, 4:27 AM MST | SNOW 11 | 1 Nnw Federal Heights, CO | |
| Feb 25, 4:35 AM MST | SNOW 5.5 | 5 S Barr Lake, CO | |
| Feb 25, 4:43 AM MST | SNOW 12.8 | 2 Ese Federal Heights, CO | SNOW FELL IN 10 HOURS. |
| Feb 25, 4:46 AM MST | SNOW 12 | 1 E Chatfield Reservoir, CO | |
| Feb 25, 4:51 AM MST | SNOW 12.5 | 1 Ese Ken Caryl, CO | |
| Feb 25, 4:54 AM MST | SNOW 12 | 5 Nne Cherry Hills Vill, CO | |
| Feb 25, 5:00 AM MST | SNOW 4.5 | Evergreen, CO | |
| Feb 25, 5:00 AM MST | SNOW 8.7 | 1 W Brighton, CO | COCORAHS STATION CO-AD-204 BRIGHTON 1.9 NNW. |
| Feb 25, 5:00 AM MST | SNOW 8.8 | 3 Ssw Boulder, CO | STORM TOTAL SNOW. |
| Feb 25, 5:00 AM MST | SNOW 9.6 | Denver Intl Airport, CO | SNOWFALL THROUGH 5 AM. |
| Feb 25, 5:01 AM MST | SNOW 13 | 1 Ese Littleton, CO | |
| Feb 25, 5:03 AM MST | SNOW 11.5 | 3 Wsw Aurora, CO | 0.59 INCHES OF LIQUID. |
| Feb 25, 5:05 AM MST | SNOW 13.2 | 1 Se Littleton, CO | |
| Feb 25, 5:40 AM MST | SNOW 6.6 | 3 Ssw Crescent Village, CO | COCORAHS STATION CO-JF-425 GOLDEN 11.8 NW. |
| Feb 25, 5:42 AM MST | SNOW 13.2 | 1 Ese Thornton, CO | STORM TOTAL SNOWFALL. |
| Feb 25, 5:45 AM MST | SNOW 12.2 | 2 Ese Denver, CO | |
| Feb 25, 5:47 AM MST | SNOW 9.6 | 1 Ese Lafayette, CO | |
| Feb 25, 5:57 AM MST | SNOW 2.6 | 3 Ssw Castle Pines, CO | |
| Feb 25, 6:00 AM MST | SNOW 6.5 | 4 Wsw Arvada, CO | COCORAHS STATION CO-JF-504 ARVADA 3.6 WSW. |
| Feb 25, 6:00 AM MST | SNOW 8 | Arvada, CO | |
| Feb 25, 6:00 AM MST | SNOW 8.1 | 4 Se Evergreen, CO | COCORAHS STATION CO-JF-403 EVERGREEN 3.5 SE. |
| Feb 25, 6:00 AM MST | SNOW 11.2 | 1 Wsw Aurora, CO | COCORAHS STATION CO-AR-270 AURORA 0.7 WSW. |
| Feb 25, 6:00 AM MST | SNOW 15.2 | Littleton, CO | COCORAHS STATION CO-AR-386 LITTLETON 0.1 ESE. |
| Feb 25, 6:10 AM MST | SNOW 8 | 4 W Conifer, CO | |
| Feb 25, 6:25 AM MST | SNOW 5.8 | 2 N Longmont, CO | |
| Feb 25, 6:30 AM MST | SNOW 4 | Longmont, CO | |
| Feb 25, 6:30 AM MST | SNOW 5 | 2 Se Lakewood, CO | |
| Feb 25, 6:30 AM MST | SNOW 11.2 | 6 N Westminster, CO | |
| Feb 25, 6:30 AM MST | SNOW 13.2 | 3 N Cherry Creek Reserv, CO | COCORAHS STATION CO-AR-105 DENVER 6.3 SSE. |
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, 5.3 hours before the alert went out and 141 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1786 m above ground
- 0-6 km bulk shear
- 80 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
486 WWUS45 KBOU 250519 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 1019 PM MST Wed Feb 24 2021 .The heaviest snow is falling across the Denver metro area, and will only slowly diminish overnight. Travel is discouraged and will be difficult. Slick roads are expected for early morning commuters. COZ039-040-251330- /O.UPG.KBOU.WW.Y.0015.000000T0000Z-210225T1500Z/ /O.NEW.KBOU.WS.W.0003.210225T0519Z-210225T1500Z/ 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- Including the cities of Boulder, Golden, Highlands Ranch, City of Denver, Lakewood, Aurora, Arvada, Littleton, Parker, Longmont, Denver International Airport, and Brighton 1019 PM MST Wed Feb 24 2021 ...WINTER STORM WARNING IN EFFECT UNTIL 8 AM MST THURSDAY... * WHAT...Snow expected. Total snow accumulations between 6 and 10 inches, with locally higher amounts possible. * WHERE...Boulder and the western suburbs of Denver, and Denver. * WHEN...Until 8 AM MST Thursday. * IMPACTS...Plan on difficult travel. The hazardous conditions could impact the Thursday morning 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 && $$ COZ035-036-041-251330- /O.CON.KBOU.WW.Y.0015.000000T0000Z-210225T1500Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet-Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Evergreen, Georgetown, Glendevey, Castle Rock, Nederland, Larkspur, Elbert, Westcreek, Central City, Red Feather Lakes, Kiowa, Idaho Springs, Estes Park, Bailey, and Fondis 1019 PM MST Wed Feb 24 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY... * WHAT...Snow expected. Total snow accumulations between 4 to 10 inches. * WHERE...The Northern Front Range Foothills, The Southern Front Range Foothills, and Castle Rock. * WHEN...Until 8 AM MST Thursday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday morning commute. Roads will likely become slick and hazardous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ For more information from the National Weather Service, visit https://weather.gov/bou Barjenbruch
2 follow-up statements
270 WWUS45 KBOU 250911 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 211 AM MST Thu Feb 25 2021 .The heaviest snow is falling across the Denver metro area, and will only slowly diminish into the early morning hours. Travel will be difficult and is discouraged. Lighter snow is occurring across the rest of the Front Range and adjacent plains. Slick roads are expected for the morning commute. COZ039-040-251500- /O.CON.KBOU.WS.W.0003.000000T0000Z-210225T1500Z/ 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- Including the cities of Boulder, Golden, Highlands Ranch, City of Denver, Lakewood, Aurora, Arvada, Littleton, Parker, Longmont, Denver International Airport, and Brighton 211 AM MST Thu Feb 25 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 AM MST THIS MORNING... * WHAT...Snow expected. Total snow accumulations between 7 and 12 inches. * WHERE...Denver, Boulder, and the western suburbs of Denver. * WHEN...Until 8 AM MST this morning. * IMPACTS...Plan on difficult travel. The hazardous conditions could impact the Thursday morning 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 && $$ COZ045>047-251700- /O.EXB.KBOU.WW.Y.0015.000000T0000Z-210225T1700Z/ Central and East Adams and Arapahoe Counties-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Southeast Elbert County Below 6000 Feet/South Lincoln County- Including the cities of Hugo, Punkin Center, Karval, Bennett, Matheson, Limon, Deer Trail, Byers, Agate, Forder, Kutch, and Leader 211 AM MST Thu Feb 25 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 AM MST THIS MORNING... * WHAT...Snow ongoing. Additional snow accumulations up to two inches, with storm totals of 3 to 7 inches. * WHERE...Byers, Limon, and Southern Lincoln County. * WHEN...Until 10 AM MST this morning. * IMPACTS...Plan on slick and hazardous road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ COZ035-036-041-251500- /O.CON.KBOU.WW.Y.0015.000000T0000Z-210225T1500Z/ 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-Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Evergreen, Georgetown, Glendevey, Castle Rock, Nederland, Larkspur, Elbert, Westcreek, Central City, Red Feather Lakes, Kiowa, Idaho Springs, Estes Park, Bailey, and Fondis 211 AM MST Thu Feb 25 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THIS MORNING... * WHAT...Snow expected. Total snow accumulations between 4 to 10 inches. * WHERE...The Northern Front Range Foothills, The Southern Front Range Foothills, and Castle Rock. * WHEN...Until 8 AM MST this morning. * IMPACTS...Plan on slick and hazardous road conditions. The hazardous conditions will impact the Thursday morning 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 && $$ For more information from the National Weather Service, visit https://weather.gov/bou Barjenbruch
215 WWUS45 KBOU 251453 WSWBOU URGENT - WINTER WEATHER MESSAGE National Weather Service Denver CO 753 AM MST Thu Feb 25 2021 COZ039-040-251600- /O.EXP.KBOU.WS.W.0003.000000T0000Z-210225T1500Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Including the cities of Boulder, Golden, Highlands Ranch, City of Denver, Lakewood, Aurora, Arvada, Littleton, Parker, Longmont, Denver International Airport, and Brighton 753 AM MST Thu Feb 25 2021 ...WINTER STORM WARNING WILL EXPIRE AT 8 AM MST THIS MORNING... $$ COZ035-036-041-251600- /O.EXP.KBOU.WW.Y.0015.000000T0000Z-210225T1500Z/ 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-Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Evergreen, Georgetown, Glendevey, Castle Rock, Nederland, Larkspur, Elbert, Westcreek, Central City, Red Feather Lakes, Kiowa, Idaho Springs, Estes Park, Bailey, and Fondis 753 AM MST Thu Feb 25 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 8 AM MST THIS MORNING... $$ COZ045>047-251700- /O.CON.KBOU.WW.Y.0015.000000T0000Z-210225T1700Z/ Central and East Adams and Arapahoe Counties-North and Northeast Elbert County Below 6000 Feet/North Lincoln County-Southeast Elbert County Below 6000 Feet/South Lincoln County- Including the cities of Hugo, Punkin Center, Karval, Bennett, Matheson, Limon, Deer Trail, Byers, Agate, Forder, Kutch, and Leader 753 AM MST Thu Feb 25 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM MST THIS MORNING... * WHAT...Light snow is ongoing. Additional snow accumulations up to 1 inch is possible. * WHERE...Byers, Limon, and Southern Lincoln County. * WHEN...Until 10 AM MST this morning. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for Colorado can be obtained by calling 5 1 1 or by going to www.cotrip.org && $$ For more information from the National Weather Service, visit https://weather.gov/bou Bowen
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.