Alert archive / Colorado / Wind Chill Warnings in 2021

Wind Chill Warning 1, NWS Denver/Boulder, CO

February 14, 202112 counties in Colorado

NWS Denver/Boulder, CO issued this wind chill warning at Feb 14, 2021, 2:48 PM MST for 12 counties in Colorado. It was in force for 20 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 14, 2021, 2:48 PM MST (21:48 UTC)
Expired
Feb 15, 2021, 11:00 AM MST
In force
20 hr
Issued by
NWS Denver/Boulder, CO

Counties Adams County, CO, Arapahoe County, CO, Douglas County, CO, Elbert County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 69 km from the middle of the area, began a volume at 21:50 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, 9.8 hours before the alert went out and 55 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 2021-02-14Temperature 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 2021-02-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 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
783 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

788 
WWUS45 KBOU 142148
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver/Boulder CO
248 PM MST Sun Feb 14 2021

COZ041>051-150600-
/O.UPG.KBOU.WC.Y.0002.000000T0000Z-210215T1800Z/
/O.NEW.KBOU.WC.W.0001.210214T2148Z-210215T1800Z/
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 Castle Rock, Elbert, Fondis, Kiowa, Larkspur, 
Briggsdale, Grover, Pawnee Buttes, Raymer, Stoneham, Eaton, 
Fort Lupton, Greeley, Roggen, Brush, Fort Morgan, Goodrich, 
Wiggins, Bennett, Byers, Deer Trail, Leader, Agate, Hugo, Limon, 
Matheson, Forder, Karval, Kutch, Punkin Center, Crook, Merino, 
Sterling, Peetz, Akron, Cope, Last Chance, Otis, Julesburg, Ovid,
Sedgwick, Amherst, Haxtun, and Holyoke
248 PM MST Sun Feb 14 2021

...WIND CHILL WARNING IN EFFECT UNTIL 11 AM MST MONDAY...

* WHAT...Dangerously cold wind chills. Wind chills as low as 40 
  below zero.

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

* WHEN...Until 11 AM MST Monday.

* IMPACTS...The dangerously cold wind chills could cause frostbite
  on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Avoid outside activities if possible. When outside, make sure you
wear appropriate clothing, a hat, and gloves. 

&&

$$

COZ038>040-150600-
/O.CON.KBOU.WC.Y.0002.000000T0000Z-210215T1800Z/
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-
Including Fort Collins, Hereford, Loveland, Nunn, Arvada, 
Boulder, Golden, Lakewood, Longmont, Aurora, Brighton, 
City of Denver, Denver International Airport, Highlands Ranch, 
Littleton, and Parker
248 PM MST Sun Feb 14 2021

...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST MONDAY...

* WHAT...Very cold wind chills. Wind chills as low as 30 below 
  zero.

* WHERE...Denver, Boulder and the western suburbs of Denver and 
  Larimer County below 6000 feet and Northwest Weld County.

* WHEN...Until 11 AM MST Monday.

* IMPACTS...The dangerously cold wind chills could cause 
  frostbite on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution while traveling outside. Wear appropriate clothing, a
hat, and gloves. 

&&

$$
3 follow-up statements
357 
WWUS45 KBOU 150253
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver/Boulder CO
753 PM MST Sun Feb 14 2021

COZ038-151100-
/O.UPG.KBOU.WC.Y.0002.000000T0000Z-210215T1800Z/
/O.EXA.KBOU.WC.W.0001.000000T0000Z-210215T1800Z/
Larimer County Below 6000 Feet/Northwest Weld County-
Including Fort Collins, Hereford, Loveland, and Nunn
753 PM MST Sun Feb 14 2021

...WIND CHILL WARNING IN EFFECT UNTIL 11 AM MST MONDAY...

* WHAT...Dangerously cold wind chills. Wind chills as low as 35 
  below zero .

* WHERE...Larimer County below 6000 feet and Northwest Weld 
  County.

* WHEN...Until 11 AM MST Monday.

* IMPACTS...The dangerously cold wind chills could cause 
  frostbite on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Avoid outside activities if possible. When outside, make sure you
wear appropriate clothing, a hat, and gloves. 

&&

$$

COZ041>051-151100-
/O.CON.KBOU.WC.W.0001.000000T0000Z-210215T1800Z/
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 Castle Rock, Elbert, Fondis, Kiowa, Larkspur, 
Briggsdale, Grover, Pawnee Buttes, Raymer, Stoneham, Eaton, 
Fort Lupton, Greeley, Roggen, Brush, Fort Morgan, Goodrich, 
Wiggins, Bennett, Byers, Deer Trail, Leader, Agate, Hugo, Limon, 
Matheson, Forder, Karval, Kutch, Punkin Center, Crook, Merino, 
Sterling, Peetz, Akron, Cope, Last Chance, Otis, Julesburg, Ovid,
Sedgwick, Amherst, Haxtun, and Holyoke
753 PM MST Sun Feb 14 2021

...WIND CHILL WARNING REMAINS IN EFFECT UNTIL 11 AM MST MONDAY...

* WHAT...Dangerously cold wind chills. Wind chills as lows as 40 
  below zero.

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

* WHEN...Until 11 AM MST Monday.

* IMPACTS...The dangerously cold wind chills could cause 
  frostbite on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Avoid outside activities if possible. When outside, make sure you
wear appropriate clothing, a hat, and gloves. 

&&

$$

COZ039-040-151100-
/O.CON.KBOU.WC.Y.0002.000000T0000Z-210215T1800Z/
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 Arvada, Boulder, Golden, Lakewood, Longmont, Aurora, 
Brighton, City of Denver, Denver International Airport, 
Highlands Ranch, Littleton, and Parker
753 PM MST Sun Feb 14 2021

...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST MONDAY...

* WHAT...Very cold wind chills. Wind chills as low as 30 below 
  zero.

* WHERE...Denver, Boulder and the western suburbs of Denver.

* WHEN...Until 11 AM MST Monday.

* IMPACTS...The dangerously cold wind chills could cause 
  frostbite on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution while traveling outside. Wear appropriate clothing, a
hat, and gloves. 

&&

$$
305 
WWUS45 KBOU 150956
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
256 AM MST Mon Feb 15 2021

COZ038-151800-
/O.CON.KBOU.WC.W.0001.000000T0000Z-210215T1800Z/
Larimer County Below 6000 Feet/Northwest Weld County-
Including the cities of Fort Collins, Loveland, Nunn, and
Hereford
256 AM MST Mon Feb 15 2021

...WIND CHILL WARNING REMAINS IN EFFECT UNTIL 11 AM MST THIS 
MORNING...

* WHAT...Dangerously cold wind chills ongoing. Wind chills as low as 
  35 below zero.

* WHERE...Fort Collins.

* WHEN...Until 11 AM MST this morning.

* IMPACTS...The dangerously cold wind chills could cause frostbite 
  on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The combination of wind and cold temperatures will create 
dangerously low wind chill values. Avoid outside activities if 
possible. When outside, make sure you wear appropriate clothing, a 
hat, and gloves.

&&

$$

COZ041>051-151800-
/O.CON.KBOU.WC.W.0001.000000T0000Z-210215T1800Z/
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, Fort Morgan, Elbert, Hugo,
Roggen, Forder, Julesburg, Larkspur, Agate, Briggsdale, Leader,
Sterling, Pawnee Buttes, Sedgwick, Crook, Akron, Raymer, Amherst,
Fort Lupton, Cope, Ovid, Matheson, Peetz, Kiowa, Grover, Eaton,
Deer Trail, Byers, Fondis, Kutch, Haxtun, Last Chance, Castle
Rock, Goodrich, Stoneham, Karval, Greeley, Bennett, Otis, Punkin
Center, Holyoke, Brush, Limon, and Merino
256 AM MST Mon Feb 15 2021

...WIND CHILL WARNING REMAINS IN EFFECT UNTIL 11 AM MST THIS 
MORNING...

* WHAT...Dangerously cold wind chills ongoing. Wind chills as low as 
  45 below zero.

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

* WHEN...Until 11 AM MST this morning.

* IMPACTS...The dangerously cold wind chills could cause frostbite 
  on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The combination of wind and cold temperatures will create 
dangerously low wind chill values. Avoid outside activities if 
possible. When outside, make sure you wear appropriate clothing, a 
hat, and gloves.

&&

$$

COZ031-151800-
/O.NEW.KBOU.WW.Y.0012.210215T2100Z-210217T0100Z/
West Jackson and West Grand Counties Above 9000 Feet-
Including the cities of Mt Zirkel
256 AM MST Mon Feb 15 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TO 6 
PM MST TUESDAY...

* WHAT...Snow expected. Total snow accumulations between 5 to 10 
  inches. Winds gusting as high as 40 mph over the ridges.

* WHERE...Rabbit Ears Pass.

* WHEN...From 2 PM this afternoon to 6 PM MST Tuesday.

* IMPACTS...Travel could be very difficult. 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

&&

$$

COZ039-040-151800-
/O.CON.KBOU.WC.Y.0002.000000T0000Z-210215T1800Z/
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
256 AM MST Mon Feb 15 2021

...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS 
MORNING...

* WHAT...Very cold wind chills ongoing. Wind chills as low as 25 
  below zero.

* WHERE...Boulder and the western suburbs of Denver, and Denver.

* WHEN...Until 11 AM MST this morning.

* IMPACTS...The dangerously cold wind chills could cause frostbite 
  on exposed skin in as little as 10 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The combination of wind and cold temperatures will create 
dangerously low wind chill values. If you go outside, cover all 
parts of your body, especially your head, face, and hands.

&&

$$

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

Meier
703 
WWUS45 KBOU 151741
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1041 AM MST Mon Feb 15 2021

COZ050-051-160145-
/O.EXP.KBOU.WC.W.0001.000000T0000Z-210215T1800Z/
/O.NEW.KBOU.WC.Y.0003.210216T0100Z-210216T1700Z/
Sedgwick County-Phillips County-
Including the cities of Ovid, Holyoke, Julesburg, Amherst,
Sedgwick, and Haxtun
1041 AM MST Mon Feb 15 2021

...WIND CHILL ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 10 AM MST 
TUESDAY...
...WIND CHILL WARNING WILL EXPIRE AT 11 AM MST THIS MORNING...

* WHAT...Very cold wind chills expected. Wind chills as low as 25 
  below zero.

* WHERE...Julesburg, and Holyoke.

* WHEN...From 6 PM this evening to 10 AM MST Tuesday.

* IMPACTS...The dangerously cold wind chills could cause frostbite 
  on exposed skin in as little as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

The combination of wind and cold temperatures will create 
dangerously low wind chill values. If you go outside, cover all 
parts of your body, especially your head, face, and hands.

&&

$$

COZ038-041>049-151845-
/O.EXP.KBOU.WC.W.0001.000000T0000Z-210215T1800Z/
Larimer County Below 6000 Feet/Northwest Weld 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-
Including the cities of Wiggins, Fort Morgan, Elbert, Hugo,
Roggen, Forder, Larkspur, Agate, Briggsdale, Leader, Sterling,
Pawnee Buttes, Crook, Akron, Raymer, Fort Lupton, Cope, Matheson,
Loveland, Peetz, Kiowa, Grover, Eaton, Deer Trail, Byers, Fondis,
Kutch, Last Chance, Castle Rock, Goodrich, Stoneham, Fort
Collins, Greeley, Bennett, Otis, Punkin Center, Nunn, Brush,
Karval, Limon, Hereford, and Merino
1041 AM MST Mon Feb 15 2021

...WIND CHILL WARNING WILL EXPIRE AT 11 AM MST THIS MORNING...

$$

COZ039-040-151845-
/O.EXP.KBOU.WC.Y.0002.000000T0000Z-210215T1800Z/
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
1041 AM MST Mon Feb 15 2021

...WIND CHILL ADVISORY WILL EXPIRE AT 11 AM MST THIS MORNING...

$$

COZ031-160145-
/O.CON.KBOU.WW.Y.0012.210215T2100Z-210217T0100Z/
West Jackson and West Grand Counties Above 9000 Feet-
Including the cities of Mt Zirkel
1041 AM MST Mon Feb 15 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM THIS 
AFTERNOON TO 6 PM MST TUESDAY...

* WHAT...Snow expected. Total snow accumulations between 5 to 10 
  inches with locally higher amounts. Winds gusting as high as 40 
  mph over the ridges.

* WHERE...Rabbit Ears Pass.

* WHEN...From 2 PM this afternoon to 6 PM MST Tuesday.

* IMPACTS...Travel could be very difficult. 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

Nearby

Wind Chill Warnings in Colorado, 2021Every wind chill 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.