Alert archive / Colorado / High Wind Warnings in 2021
High Wind Warning 9, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this high wind warning at Dec 10, 2021, 1:56 PM MST for 10 counties in Colorado. It took effect at Dec 11, 2021, 12:00 AM MST. It was in force for 27 hr. 5 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
- Dec 10, 2021, 1:56 PM MST (20:56 UTC)
- In effect from
- Dec 11, 2021, 12:00 AM MST
- Expired
- Dec 12, 2021, 3:14 AM MST
- In force
- 27 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO
The radar
The Denver radar (KFTG), 94 km from the middle of the area, began a volume at 20:54 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 |
|---|---|---|---|
| Dec 11, 12:30 AM MST | NON-TSTM WND GST 87 | 2 Wsw Brainard Lake, CO | SUSTAINED WINDS 65 MPH. NIWOT RIDGE D1 STATION AT 12,267 FEET. |
| Dec 11, 1:10 AM MST | HIGH SUST WINDS 61 | 1 Sw Brainard Lake, CO | PEAK GUST 71 MPH. NIWOT RIDGE SADDLE AT 11,575 FEET. |
| Dec 11, 10:35 AM MST | NON-TSTM WND GST 68 | 1 Ene Berthoud Pass, CO | AWOS STATION K0CO BERTHOUD PASS. SUSTAINED WIND 53 MPH. |
| Dec 11, 8:55 PM MST | NON-TSTM WND GST 76 | 3 Se Tolland, CO | AWOS STATION KC99 DAKOTA HILL. SUSTAINED WIND 55 MPH. |
| Dec 11, 9:35 PM MST | NON-TSTM WND GST 84 | 3 Se Tolland, CO | AWOS STATION KC99 DAKOTA HILL. |
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 12:00Z, 8.9 hours before the alert went out and 206 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
- 802 m above ground
- 0-6 km bulk shear
- 101 kt
- 0-1 km storm-relative helicity
- -264 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
146 WWUS75 KBOU 102056 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 156 PM MST Fri Dec 10 2021 COZ033>036-111145- /O.UPG.KBOU.HW.A.0007.211211T1200Z-211212T0000Z/ /O.NEW.KBOU.HW.W.0009.211211T0700Z-211212T1900Z/ 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 156 PM MST Fri Dec 10 2021 ...HIGH WIND WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO NOON MST SUNDAY... * WHAT...West winds 35 to 45 mph with gusts up to 80 mph expected. * WHERE...Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 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 and South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet Counties. * WHEN...From Midnight tonight to Noon MST Sunday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. Expect considerable blowing and drifting snow over the high mountain passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain in the lower levels of your home during the windstorm, and avoid windows. Watch for falling debris and tree limbs. Use caution if you must drive. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Entrekin
5 follow-up statements
553 WWUS75 KBOU 110353 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 853 PM MST Fri Dec 10 2021 COZ033>036-111600- /O.CON.KBOU.HW.W.0009.211211T0700Z-211212T1900Z/ 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 853 PM MST Fri Dec 10 2021 ...HIGH WIND WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON MST SUNDAY... * WHAT...West winds 35 to 45 mph with gusts up to 80 mph expected. * WHERE...Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 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 and South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet Counties. * WHEN...From Midnight tonight to Noon MST Sunday. * IMPACTS...Damaging winds will blow down trees and power lines. Power outages may occur. Travel will be difficult, especially for high profile vehicles. Expect considerable blowing and drifting snow over the high mountain passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Watch for falling debris and tree limbs. Use caution if you must drive. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Danielson
533 WWUS75 KBOU 111151 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 451 AM MST Sat Dec 11 2021 COZ033>036-112000- /O.CON.KBOU.HW.W.0009.000000T0000Z-211212T1900Z/ 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 451 AM MST Sat Dec 11 2021 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON MST SUNDAY... * WHAT...West winds 35 to 50 mph with gusts up to 85 mph expected. * WHERE...Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 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 and South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet Counties. * WHEN...Until Noon MST Sunday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Watch for falling debris and tree limbs. Use caution if you must drive. && $$ For more information from the National Weather Service, visit https://weather.gov/bou RJK
218 WWUS75 KBOU 112047 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 147 PM MST Sat Dec 11 2021 COZ033>036-121200- /O.CON.KBOU.HW.W.0009.000000T0000Z-211212T1900Z/ 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 147 PM MST Sat Dec 11 2021 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON MST SUNDAY... * WHAT...West winds 35 to 50 mph with gusts up to 85 mph expected. * WHERE...Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 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 and South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet Counties. * WHEN...Until Noon MST Sunday. * IMPACTS...Damaging winds will blow down trees and power lines. Power outages may occur. Travel will be difficult, especially for high profile vehicles. Expect considerable blowing and drifting snow over the high mountain passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Watch for falling debris and tree limbs. Use caution if you must drive. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Hiris
722 WWUS75 KBOU 120245 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver/Boulder CO 745 PM MST Sat Dec 11 2021 COZ036-120345- /O.CAN.KBOU.HW.W.0009.000000T0000Z-211212T1900Z/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Including Bailey, Central City, Evergreen, Georgetown, Idaho Springs, and Westcreek 745 PM MST Sat Dec 11 2021 ...HIGH WIND WARNING IS CANCELLED... Winds are weakening and no longer expected to meet warning criteria. These areas can still expect gusts 35 to 55 mph at times through midday Sunday. $$ COZ033>035-121300- /O.CON.KBOU.HW.W.0009.000000T0000Z-211212T1900Z/ South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, Willow Creek Pass, Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, Williams Fork Mountains, Winter Park, Estes Park, Glendevey, Nederland, and Red Feather Lakes 745 PM MST Sat Dec 11 2021 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON MST SUNDAY... * WHAT...West winds 15 to 30 mph with localized gusts up to 75 mph possible. * WHERE...The Northern Front Range Foothills, The Mountains of Summit County, the Mosquito Range, and the Indian Peaks and Rocky Mountain National Park and the Medicine Bow Range. * WHEN...Until noon MST Sunday. * IMPACTS...Strong winds will blow unsecured objects around. Tree limbs could be blown down and a few power outages may result. Travel will be difficult for high profile vehicles. Areas of blowing snow will be likely over high mountain passes and roadways. PRECAUTIONARY/PREPAREDNESS ACTIONS... Strong winds may lead to property damage. Hazardous driving conditions due to powerful cross winds will pose a serious risk for drivers, especially for light weight and high profile vehicles. Loose outdoor items should be brought inside or secured properly. && $$
888 WWUS75 KBOU 121014 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 314 AM MST Sun Dec 12 2021 COZ033>035-121115- /O.CAN.KBOU.HW.W.0009.000000T0000Z-211212T1900Z/ 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- Including the cities of Glendevey, East Slopes Mosquito Range, Estes Park, Indian Peaks, Nederland, Eisenhower Tunnel, Rocky Mountain National Park, East Slopes Southern Gore Range, Mount Evans, Laramie and Medicine Bow Mountains, Red Feather Lakes, Cameron Pass, Breckenridge, Kenosha Mountains, Winter Park, Williams Fork Mountains, Willow Creek Pass, Rabbit Ears Range, and Berthoud Pass 314 AM MST Sun Dec 12 2021 ...HIGH WIND WARNING IS CANCELLED... The threat has ended. $$ For more information from the National Weather Service, visit https://weather.gov/bou RJK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 4:05 AM MST | High Wind Watch | BOU | Boulder, Clear Creek, Douglas, Gilpin, Grand, Jackson and 4 more | 10 hr |
Nearby
High Wind Warnings in Colorado, 2021Every high wind 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.