Alert archive / Colorado / High Wind Watches in 2021

High Wind Watch 8, NWS Denver/Boulder, CO

December 13, 202119 counties in Colorado

NWS Denver/Boulder, CO issued this high wind watch at Dec 13, 2021, 2:20 PM MST for 19 counties in Colorado. It took effect at Dec 15, 2021, 10:00 AM MST. It was in force for .

The area

The counties it named.

The facts

Issued
Dec 13, 2021, 2:20 PM MST (21:20 UTC)
In effect from
Dec 15, 2021, 10:00 AM MST
Expired
Dec 14, 2021, 4:34 AM MST
In force
Issued by
NWS Denver/Boulder, CO

Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 22 km from the middle of the area, began a volume at 21:18 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.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 9.3 hours before the alert went out and 99 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2021-12-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2021-12-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -44 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3082 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
-44 m²/s²
0-3 km storm-relative helicity
54 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

811 
WWUS75 KBOU 132120
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver CO
220 PM MST Mon Dec 13 2021

COZ035>042-044>051-141200-
/O.NEW.KBOU.HW.A.0008.211215T1700Z-211216T0000Z/
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-Central and
Southeast Park County-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-
Northeast Weld County-Morgan County-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-Logan County-Washington County-
Sedgwick County-Phillips County-
Including the cities of Wiggins, Fort Morgan, Deer Trail,
Hartsel, Karval, Elbert, Westcreek, Hugo, Arvada, Central City,
Red Feather Lakes, Julesburg, Larkspur, Agate, Bailey, Leader,
Evergreen, Georgetown, Glendevey, Pawnee Buttes, Nederland,
Crook, Aurora, Fairplay, Littleton, Amherst, Sterling, Akron,
Last Chance, Sedgwick, Raymer, South Park, Byers, Boulder,
Highlands Ranch, Cope, City of Denver, Ovid, Matheson, Loveland,
Peetz, Kiowa, Grover, Estes Park, Longmont, Fondis, Forder,
Kutch, Denver International Airport, Haxtun, Goodrich, Golden,
Parker, Castle Rock, Lakewood, Briggsdale, Stoneham, Fort
Collins, Bennett, Otis, Punkin Center, Holyoke, Nunn, Idaho
Springs, Brush, Lake George, Limon, Hereford, Merino, and
Brighton
220 PM MST Mon Dec 13 2021

...HIGH WIND WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH 
WEDNESDAY AFTERNOON...

* WHAT...West winds 30 to 40 mph with gusts over 60 mph on the 
  plains, and in the foothills 40 to 50 mph with gusts over 75 mph.

* WHERE...Foothills and plains

* WHEN...From Wednesday morning through Wednesday afternoon.

* IMPACTS...Damaging winds could blow down trees and power lines. 
  Widespread power outages are possible. Travel could be difficult, 
  especially for high profile vehicles. Blowing dust will reduce 
  visibility to less than a quarter mile in places.

* ADDITIONAL DETAILS...Strong winds and low humidity will create 
  critical fire weather conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates.

Fasten loose objects or shelter objects in a safe location prior to 
the onset of winds.

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

Hanson
2 follow-up statements
429 
WWUS75 KBOU 132131
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver CO
231 PM MST Mon Dec 13 2021

COZ043-141215-
/O.EXA.KBOU.HW.A.0008.211215T1700Z-211216T0000Z/
Central and South Weld County-
Including the cities of Fort Lupton, Greeley, Eaton, and Roggen
231 PM MST Mon Dec 13 2021

...HIGH WIND WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH 
WEDNESDAY AFTERNOON...

* WHAT...West winds 30 to 40 mph with gusts over 60 mph on the 
  plains.

* WHERE...Central and South Weld County County.

* WHEN...From Wednesday morning through Wednesday afternoon.

* IMPACTS...Damaging winds could blow down trees and power lines. 
  Widespread power outages are possible. Travel could be difficult, 
  especially for high profile vehicles. Blowing dust will reduce 
  visibility to less than a quarter mile in places.

* ADDITIONAL DETAILS...Strong winds and low humidity will create 
  critical fire weather conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates.

Fasten loose objects or shelter objects in a safe location prior to 
the onset of winds.

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

COZ035>042-044>051-141215-
/O.CON.KBOU.HW.A.0008.211215T1700Z-211216T0000Z/
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-Central and
Southeast Park County-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-
Northeast Weld County-Morgan County-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-Logan County-Washington County-
Sedgwick County-Phillips County-
Including the cities of Wiggins, Fort Morgan, Deer Trail,
Hartsel, Karval, Elbert, Westcreek, Hugo, Arvada, Central City,
Red Feather Lakes, Julesburg, Larkspur, Agate, Bailey, Leader,
Evergreen, Georgetown, Glendevey, Pawnee Buttes, Nederland,
Crook, Aurora, Fairplay, Littleton, Amherst, Sterling, Akron,
Last Chance, Sedgwick, Raymer, South Park, Byers, Boulder,
Highlands Ranch, Cope, City of Denver, Ovid, Matheson, Loveland,
Peetz, Kiowa, Grover, Estes Park, Longmont, Fondis, Forder,
Kutch, Denver International Airport, Haxtun, Goodrich, Golden,
Parker, Castle Rock, Lakewood, Briggsdale, Stoneham, Fort
Collins, Bennett, Otis, Punkin Center, Holyoke, Nunn, Idaho
Springs, Brush, Lake George, Limon, Hereford, Merino, and
Brighton
231 PM MST Mon Dec 13 2021

...HIGH WIND WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH 
WEDNESDAY AFTERNOON...

* WHAT...West winds 30 to 40 mph with gusts over 60 mph on the 
  plains, and in the foothills 40 to 50 mph with gusts over 75 mph.

* WHERE...Portions of central, east central, north central, and 
  northeast Colorado.

* WHEN...From Wednesday morning through Wednesday afternoon.

* IMPACTS...Damaging winds could blow down trees and power lines. 
  Widespread power outages are possible. Travel could be difficult, 
  especially for high profile vehicles. Blowing dust will reduce 
  visibility to less than a quarter mile in places on the plains.

* ADDITIONAL DETAILS...Strong winds and low humidity will create 
  critical fire weather conditions on the plains.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates.

Fasten loose objects or shelter objects in a safe location prior to 
the onset of winds.

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

Hanson
759 
WWUS75 KBOU 141134
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver CO
434 AM MST Tue Dec 14 2021

COZ035>039-142215-
/O.UPG.KBOU.HW.A.0008.211215T1700Z-211216T0000Z/
/O.NEW.KBOU.HW.W.0010.211215T1500Z-211216T0000Z/
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-Central and
Southeast Park County-Larimer County Below 6000 Feet/Northwest
Weld County-Boulder And Jefferson Counties Below 6000 Feet/West
Broomfield County-
Including the cities of Hartsel, Westcreek, Arvada, Central City,
Red Feather Lakes, Bailey, Evergreen, Georgetown, Glendevey,
Nederland, Fairplay, South Park, Boulder, Loveland, Estes Park,
Longmont, Golden, Lakewood, Fort Collins, Nunn, Idaho Springs,
Lake George, and Hereford
434 AM MST Tue Dec 14 2021

...HIGH WIND WARNING IN EFFECT FROM 8 AM TO 5 PM MST WEDNESDAY...

* WHAT...West winds 30 to 50 mph with gusts reaching 60 to 80 mph. 
  Wind prone areas in and near the foothills may see gusts near 100 
  mph.

* WHERE...South Park, Northern and Southern Foothills, Jefferson 
  County, Northwest Weld County, Larimer and Boulder Counties Below 
  9000 Feet and Broomfield County.

* WHEN...From 8 AM to 5 PM MST Wednesday.

* IMPACTS...Damaging winds may blow down trees and power lines. 
  Widespread power outages will be possible. Travel will be 
  difficult, especially for high profile vehicles. Gusty winds will 
  blow around unsecured objects. Blowing dust will reduce visibility 
  to less than a quarter mile in places.

* ADDITIONAL DETAILS...Strong winds and low humidity will create 
  critical fire weather conditions on the plains.

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.

If you encounter blowing dust on the roadway or see it approaching, 
pull off the road as far as possible and put your vehicle in park. 
Turn the lights all the way off and keep foot off the brake pedal. 
Remember, 'Pull Aside, Stay Alive'.

&&

$$

COZ040>051-142215-
/O.UPG.KBOU.HW.A.0008.211215T1700Z-211216T0000Z/
/O.NEW.KBOU.HW.W.0010.211215T1500Z-211216T0000Z/
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-Elbert/Central and East
Douglas Counties Above 6000 Feet-Northeast Weld County-Central
and South Weld County-Morgan County-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-Logan County-Washington County-
Sedgwick County-Phillips County-
Including the cities of Wiggins, Pawnee Buttes, Elbert, Hugo,
Roggen, Forder, Julesburg, Larkspur, Agate, Briggsdale, Leader,
Sterling, Fort Morgan, City of Denver, Crook, Aurora, Littleton,
Amherst, Akron, Sedgwick, Raymer, Brighton, Highlands Ranch, Fort
Lupton, Cope, Ovid, Matheson, Peetz, Kiowa, Grover, Eaton, Deer
Trail, Byers, Fondis, Kutch, Denver International Airport,
Haxtun, Last Chance, Parker, Castle Rock, Goodrich, Stoneham,
Karval, Greeley, Bennett, Otis, Punkin Center, Holyoke, Brush,
Limon, and Merino
434 AM MST Tue Dec 14 2021

...HIGH WIND WARNING IN EFFECT FROM 8 AM TO 5 PM MST WEDNESDAY...

* WHAT...West winds 30 to 50 mph with gusts reaching 60 to 80 mph. 

* WHERE...Portions of east central and northeast Colorado.

* WHEN...From 8 AM to 5 PM MST Wednesday.

* IMPACTS...Damaging winds may blow down trees and power lines. 
  Widespread power outages will be possible. Travel will be 
  difficult, especially for high profile vehicles. Gusty winds will 
  blow around unsecured objects. Blowing dust will reduce visibility 
  to less than a quarter mile in places.

* ADDITIONAL DETAILS...Strong winds and low humidity may create 
  critical fire weather conditions on the plains.

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.

If you encounter blowing dust on the roadway or see it approaching, 
pull off the road as far as possible and put your vehicle in park. 
Turn the lights all the way off and keep foot off the brake pedal. 
Remember, 'Pull Aside, Stay Alive'.

&&

$$

For more information from the National Weather Service, visit 
https://weather.gov/bou

Meier

Nearby

High Wind Watches in Colorado, 2021Every high wind watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.