Alert archive / Colorado / High Wind Watches in 2021

High Wind Watch 4, NWS Denver/Boulder, CO

October 12, 2021Boulder County, Larimer County, Colorado

NWS Denver/Boulder, CO issued this high wind watch at Oct 12, 2021, 3:56 AM MDT for Boulder County, Larimer County, Colorado. It took effect at Oct 13, 2021, 12:00 AM MDT. It was in force for .

The area

The counties it named.

The facts

Issued
Oct 12, 2021, 3:56 AM MDT (09:56 UTC)
In effect from
Oct 13, 2021, 12:00 AM MDT
Expired
Oct 12, 2021, 2:47 PM MDT
In force
Issued by
NWS Denver/Boulder, CO

Counties Boulder County, CO, Larimer County, CO

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 9.9 hours before the alert went out and 194 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 00:00Z on 2021-10-12Temperature 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 00:00Z on 2021-10-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.1939587897Sfc1 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
2859 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

303 
WWUS75 KBOU 120956
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver CO
356 AM MDT Tue Oct 12 2021

COZ041-046-047-122200-
/O.NEW.KBOU.HW.W.0005.211012T1800Z-211013T0000Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-North
and Northeast Elbert County Below 6000 Feet/North Lincoln County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Including the cities of Castle Rock, Punkin Center, Elbert,
Karval, Hugo, Matheson, Forder, Kiowa, Larkspur, Agate, Limon,
Fondis, and Kutch
356 AM MDT Tue Oct 12 2021

...HIGH WIND WARNING IN EFFECT FROM NOON TODAY TO 6 PM MDT THIS 
EVENING...

* WHAT...South winds 30 to 40 mph with gusts up to 60 mph expected.

* WHERE...North and Northeast Elbert County Below 6000 Feet/North 
  Lincoln County, Southeast Elbert County Below 6000 Feet/South 
  Lincoln County and Elbert/Central and East Douglas Counties Above 
  6000 Feet Counties.

* WHEN...From Noon today to 6 PM MDT this evening.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Travel will be difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain in the lower levels of your home during the windstorm, and 
avoid windows. Watch for falling debris and blowing dust. Use 
caution if you must drive.

&&

$$

COZ035-122200-
/O.NEW.KBOU.HW.A.0004.211013T0600Z-211013T1800Z/
Larimer and Boulder Counties Between 6000 and 9000 Feet-
Including the cities of Red Feather Lakes, Glendevey, Nederland,
and Estes Park
356 AM MDT Tue Oct 12 2021

...HIGH WIND WATCH IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY 
MORNING...

* WHAT...West winds 25 to 40 mph with gusts up to 75 mph possible.

* WHERE...Larimer and Boulder Counties Between 6000 and 9000 Feet 
  County.

* WHEN...From late tonight through Wednesday morning.

* IMPACTS...Damaging winds could blow down trees and power lines. 
  Widespread power outages are possible. Travel could be difficult, 
  especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates.

&&

$$

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

Entrekin
1 follow-up statement
191 
WWUS75 KBOU 122047
NPWBOU

URGENT - WEATHER MESSAGE
National Weather Service Denver/Boulder CO
247 PM MDT Tue Oct 12 2021

COZ035-130900-
/O.UPG.KBOU.HW.A.0004.211013T0600Z-211013T1800Z/
/O.NEW.KBOU.HW.W.0006.211013T0600Z-211013T1800Z/
Larimer and Boulder Counties Between 6000 and 9000 Feet-
Including Estes Park, Glendevey, Nederland, and Red Feather Lakes
247 PM MDT Tue Oct 12 2021

...HIGH WIND WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO NOON MDT
WEDNESDAY...

* WHAT...West winds 25 to 40 mph with gusts up to 75 mph expected.

* WHERE...The Northern Front Range Foothills.

* WHEN...From midnight tonight to noon MDT Wednesday.

* 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. 

* ADDITIONAL DETAILS...Damaging winds will blow down trees and
  power lines. Travel will be difficult, especially for high
  profile vehicles.

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.

&&

$$

COZ041-046-047-130000-
/O.CON.KBOU.HW.W.0005.000000T0000Z-211013T0000Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Including Castle Rock, Elbert, Fondis, Kiowa, Larkspur, Agate, 
Hugo, Limon, Matheson, Forder, Karval, Kutch, and Punkin Center
247 PM MDT Tue Oct 12 2021

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...South winds 30 to 40 mph with gusts up to 60 mph.

* WHERE...Palmer Divide including Castle Rock, Elbert, and 
  Larkspur, Eastern Elbert and Northern Lincoln Counties and 
  Southern Lincoln County.

* WHEN...Until 6 PM MDT this evening.

* 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. 

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.

&&

$$

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 12, 3:56 AM MDTHigh Wind WarningBOUArapahoe, Douglas, Elbert, Lincoln14 hr
Oct 12, 2:47 PM MDTHigh Wind WarningBOUBoulder, Larimer, Logan, Phillips, Sedgwick, Weld24 hr
Oct 12, 5:05 PM MDTSpecial Weather StatementBOULogan25 min
Oct 12, 5:18 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick42 min
Oct 12, 5:54 PM MDTTornado WarningBOUPhillips36 min

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.