Alert archive / Colorado / Red Flag Warnings in 2021

Red Flag Warning 15, NWS Denver/Boulder, CO

October 8, 20214 counties in Colorado

NWS Denver/Boulder, CO issued this red flag warning at Oct 8, 2021, 2:09 PM MDT for 4 counties in Colorado. It took effect at Oct 9, 2021, 12:00 PM MDT. It was in force for 8 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: Oct 8, 2021, 2:09 PM MDT (20:09 UTC)
In effect from: Oct 9, 2021, 12:00 PM MDT
Expired: Oct 9, 2021, 8:00 PM MDT
In force: 8 hr
Issued by: NWS Denver/Boulder, CO

Counties Arapahoe County, CO, Douglas County, CO, Elbert County, CO, Lincoln County, CO

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.2 hours before the alert went out and 106 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2442 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

091 
WWUS85 KBOU 082009
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
209 PM MDT Fri Oct 8 2021

COZ246-247-090415-
/O.UPG.KBOU.FW.A.0013.211009T1800Z-211010T0200Z/
/O.NEW.KBOU.FW.W.0015.211009T1800Z-211010T0200Z/
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
209 PM MDT Fri Oct 8 2021

...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM MDT SATURDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR ELBERT AND LINCOLN COUNTIES...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon to 8 PM MDT Saturday. The Fire Weather Watch is no
longer in effect.

* Affected Area...Fire Weather Zones 246 and 247.

* Timing...Saturday, 12 pm through 8 pm.

* Winds...West 15 to 20 mph with gusts up to 35 mph.

* Relative Humidity...As low as 15 percent.

* Impacts...Conditions will be conducive to the rapid spread of 
  new and existing fires. Probability of ignition will increase. 
  Avoid any burning or outdoor activities that may cause sparks, 
  and abide by established fire restrictions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

COZ241-090415-
/O.NEW.KBOU.FW.W.0015.211009T1800Z-211010T0200Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
209 PM MDT Fri Oct 8 2021

...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM MDT SATURDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR DOUGLAS COUNTY...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon to 8 PM MDT Saturday.

* Affected Area...Fire Weather Zone 241.

* Timing...Saturday, 12 pm through 8 pm.

* Winds...West 15 to 20 mph with gusts up to 35 mph.

* Relative Humidity...As low as 17 percent.

* Impacts...Conditions will be conducive to the rapid spread of 
  new and existing fires. Probability of ignition will increase. 
  Avoid any burning or outdoor activities that may cause sparks, 
  and abide by established fire restrictions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

4 follow-up statements

549 
WWUS85 KBOU 090509
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
1109 PM MDT Fri Oct 8 2021

COZ241-246-247-091200-
/O.CON.KBOU.FW.W.0015.211009T1800Z-211010T0200Z/
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-
1109 PM MDT Fri Oct 8 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM MDT
SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR LINCOLN, ELBERT 
AND EASTERN DOUGLAS COUNTIES...

* Affected Area...Fire Weather Zones 241, 246 and 247.

* Timing...Saturday, 12 pm through 8 pm.

* Winds...West 15 to 20 mph with gusts up to 35 mph.

* Relative Humidity...As low as 15 percent.

* Impacts...Conditions will be conducive to the rapid spread of 
  new and existing fires. Probability of ignition will increase. 
  Avoid any burning or outdoor activities that may cause sparks, 
  and abide by established fire restrictions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

290 
WWUS85 KBOU 091146
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
546 AM MDT Sat Oct 9 2021

COZ241-246-247-092115-
/O.CON.KBOU.FW.W.0015.211009T1800Z-211010T0200Z/
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-
546 AM MDT Sat Oct 9 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM MDT
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR LINCOLN,
ELBERT AND EASTERN DOUGLAS COUNTIES...

* Affected Area...Fire Weather Zones 241, 246 and 247.

* Timing...Saturday, 12 pm through 8 pm.

* Winds...West 15 to 20 mph with gusts up to 35 mph.

* Relative Humidity...As low as 12 percent.

* Impacts...Conditions will be conducive to the rapid spread of 
  new and existing fires. Probability of ignition will increase. 
  Avoid any burning or outdoor activities that may cause sparks, 
  and abide by established fire restrictions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

681 
WWUS85 KBOU 091949
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
149 PM MDT Sat Oct 9 2021

COZ241-246-247-100200-
/O.CON.KBOU.FW.W.0015.000000T0000Z-211010T0200Z/
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-
149 PM MDT Sat Oct 9 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR LINCOLN, ELBERT AND
EASTERN DOUGLAS COUNTIES...

* Affected Area...Fire Weather Zones 241, 246 and 247.

* Timing...Until 8 pm this evening. 

* Winds...West to northwest 15 to 25 mph with gusts up to 35 mph.

* Relative Humidity...As low as 14 percent.

* Impacts...Conditions will be conducive to the rapid spread of
  new fires. Probability of ignition will increase. Avoid any 
  burning or outdoor activities that may cause sparks, and abide 
  by established fire restrictions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

433 
WWUS85 KBOU 100143
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
743 PM MDT Sat Oct 9 2021


COZ241-246-247-100245-
/O.EXP.KBOU.FW.W.0015.000000T0000Z-211010T0200Z/
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-
743 PM MDT Sat Oct 9 2021

...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR LINCOLN, ELBERT AND EASTERN DOUGLAS
COUNTIES...

Due to humidity values reaching 30-40 percent and winds 
decreasing to pressure gradients weakening, the Red Flag Warning 
will be allowed to expire at 8 PM for Lincoln, Elbert, and eastern
Douglas counties. 

$$

AD

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 3:38 AM MDT	Fire Weather Watch	BOU	Elbert, Lincoln	11 hr

Nearby

Red Flag Warnings in Colorado, 2021 Every red flag 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.