Alert archive / Colorado / High Wind Warnings in 2021
High Wind Warning 8, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this high wind warning at Dec 4, 2021, 2:41 PM MST for 10 counties in Colorado. It took effect at Dec 4, 2021, 11:00 PM MST. It was in force for 12 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 4, 2021, 2:41 PM MST (21:41 UTC)
- In effect from
- Dec 4, 2021, 11:00 PM MST
- Expired
- Dec 5, 2021, 11:00 AM MST
- In force
- 12 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 21:41 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 5, 1:44 AM MST | NON-TSTM WND GST 85 | 1 N Georgetown, CO | MESONET STATION CO162 I-70 GEORGETOWN LAKE STATION ELEVATION: 8468 FT. |
| Dec 5, 3:55 AM MST | NON-TSTM WND GST 77 | 1 Ene Berthoud Pass, CO | AWOS STATION K0CO BERTHOUD PASS STATION ELEVATION: 11704 FT. |
| Dec 5, 5:36 AM MST | NON-TSTM WND GST 70 | 1 N Glen Haven, CO | MESONET STATION EW4490 GLEN HAVEN STATION ELEVATION: 7798 FT. |
| Dec 5, 5:55 AM MST | NON-TSTM WND GST 82 | 3 Se Tolland, CO | AWOS STATION KC99 DAKOTA HILL STATION ELEVATION: 10938 FT. |
| Dec 5, 9:01 AM MST | NON-TSTM WND GST 80 | 4 Ne Nederland, CO | PUBLIC REPORTED A MEASURED WIND GUST TO 80 MPH. WIND GUSTS ARE STILL 70 TO 75 MPH. |
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, 9.7 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
- 2166 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
343 WWUS75 KBOU 042141 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 241 PM MST Sat Dec 4 2021 COZ033>036-050945- /O.UPG.KBOU.HW.A.0006.211205T0900Z-211205T1800Z/ /O.NEW.KBOU.HW.W.0008.211205T0600Z-211205T1800Z/ 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 241 PM MST Sat Dec 4 2021 ...HIGH WIND WARNING IN EFFECT FROM 11 PM THIS EVENING TO 11 AM MST SUNDAY... * WHAT...West winds 25 to 40 mph with gusts up to 80 mph possible. * 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 11 PM this evening to 11 AM MST Sunday. * IMPACTS...Damaging winds may blow down trees and power lines. Power outages are possible. Gusty winds will blow around unsecured objects and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Danielson
2 follow-up statements
287 WWUS75 KBOU 050356 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 856 PM MST Sat Dec 4 2021 COZ033>036-051300- /O.CON.KBOU.HW.W.0008.211205T0600Z-211205T1800Z/ 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 856 PM MST Sat Dec 4 2021 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 11 AM MST SUNDAY... * WHAT...West winds 25 to 40 mph with gusts up to 85 mph. The strongest winds will occur Sunday morning. * 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 11 AM 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. Gusty winds will blow around unsecured objects and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. && $$ For more information from the National Weather Service, visit https://weather.gov/bou Entrekin
017 WWUS75 KBOU 051232 NPWBOU URGENT - WEATHER MESSAGE National Weather Service Denver CO 532 AM MST Sun Dec 5 2021 COZ033>036-051800- /O.CON.KBOU.HW.W.0008.000000T0000Z-211205T1800Z/ 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 532 AM MST Sun Dec 5 2021 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING... * WHAT...West winds 25 to 40 mph with gusts up to 85 mph. The strongest winds will occur Sunday morning. * 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 11 AM MST this morning. * IMPACTS...Gusty winds will blow around unsecured objects and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. && $$ For more information from the National Weather Service, visit https://weather.gov/bou AD
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 4, 2:49 AM MST | High Wind Watch | BOU | Boulder, Clear Creek, Douglas, Gilpin, Grand, Jackson and 4 more | 12 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.