Alert archive / Colorado / Red Flag Warnings in 2021
Red Flag Warning 23, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Nov 22, 2021, 2:40 PM MST for 16 counties in Colorado. It took effect at Nov 23, 2021, 9:00 AM MST. 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
- Nov 22, 2021, 2:40 PM MST (21:40 UTC)
- In effect from
- Nov 23, 2021, 9:00 AM MST
- Expired
- Nov 23, 2021, 5:00 PM MST
- In force
- 8 hr
- 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, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 59 km from the middle of the area, began a volume at 21:38 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, 9.7 hours before the alert went out and 170 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
- 3522 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
625 WWUS85 KBOU 222140 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 240 PM MST Mon Nov 22 2021 ...DANGEROUS FIRE WEATHER CONDITIONS EXPECTED TUESDAY OVER THE FRONT RANGE FOOTHILLS, PALMER DIVIDE, SOUTH PARK, AND PORTIONS OF THE URBAN CORRIDOR...FIRE ZONES 214, 215, 216, 238, 239, 242, 246, AND 247... COZ214>216-238-239-241-242-230545- /O.UPG.KBOU.FW.A.0018.211123T1800Z-211124T0000Z/ /O.NEW.KBOU.FW.W.0023.211123T1600Z-211124T0000Z/ Central and Southeast Park County- 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- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County- 240 PM MST Mon Nov 22 2021 ...RED FLAG WARNING IN EFFECT FROM 9 AM TO 5 PM MST TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS, SOUTH PARK, PALMER DIVIDE, AND PORTIONS OF THE I-25 URBAN CORRIDOR...FIRE WEATHER ZONES 214...215...216...238...239...241... AND 242... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 9 AM to 5 PM MST Tuesday. The Fire Weather Watch is no longer in effect. * Affected Area...Fire Weather Zones 214, 215, 216, 238, 239, 241 and 242. * Timing...9 AM to 5 PM MST Tuesday evening. * Winds...West 20 to 30 mph with gusts up to 45 mph. Strongest winds in the foothills. * Relative Humidity...As low as 10 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. && $$ COZ246-247-230545- /O.CON.KBOU.FW.A.0018.211123T1800Z-211124T0000Z/ North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 240 PM MST Mon Nov 22 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR EASTERN ELBERT AND LINCOLN COUNTIES...FIRE WEATHER ZONES 246 AND 247... * Affected Area...Fire Weather Zones 246 and 247. * Timing...11 AM to 5 PM MST Tuesday evening. * Winds...West 15 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 8 percent. * Impacts...Conditions will be conducive to the rapid spread of new fires. Probability of ignition will increase. Avoid any burning or outdoor activities that may cause sparks, and abide by established fire restrictions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$
5 follow-up statements
115 WWUS85 KBOU 230310 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 810 PM MST Mon Nov 22 2021 ...DANGEROUS FIRE WEATHER CONDITIONS EXPECTED TUESDAY OVER THE FRONT RANGE FOOTHILLS, PALMER DIVIDE, SOUTH PARK, AND PORTIONS OF THE URBAN CORRIDOR...FIRE ZONES 214, 215, 216, 238, 239, 242, 246, AND 247... COZ214>216-238-239-241-242-231115- /O.CON.KBOU.FW.W.0023.211123T1600Z-211124T0000Z/ Central and Southeast Park County- 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- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County- 810 PM MST Mon Nov 22 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM TO 5 PM MST TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS, SOUTH PARK, PALMER DIVIDE, AND PORTIONS OF THE I-25 URBAN CORRIDOR...FIRE WEATHER ZONES 214...215...216...238... 239...241...AND 242... * Affected Area...Fire Weather Zones 214, 215, 216, 238, 239, 241 and 242. * Timing...9 AM to 5 PM MST Tuesday evening. * Winds...West 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 9 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. && $$ COZ246-247-231115- /O.CON.KBOU.FW.A.0018.211123T1800Z-211124T0000Z/ North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 810 PM MST Mon Nov 22 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR EASTERN ELBERT AND LINCOLN COUNTIES...FIRE WEATHER ZONES 246 AND 247... * Affected Area...Fire Weather Zones 246 and 247. * Timing...11 AM to 5 PM MST Tuesday evening. * Winds...West 10 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 7 percent. * Impacts...Conditions will be conducive to the rapid spread of new fires. Probability of ignition will increase. Avoid any burning or outdoor activities that may cause sparks, and abide by established fire restrictions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$
820 WWUS85 KBOU 231018 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 318 AM MST Tue Nov 23 2021 ...DANGEROUS FIRE WEATHER CONDITIONS EXPECTED TODAY OVER THE FRONT RANGE FOOTHILLS, PALMER DIVIDE, SOUTH PARK, AND PORTIONS OF THE URBAN CORRIDOR...FIRE ZONES 214, 215, 216, 238, 239, 240, 242, 246, AND 247... COZ246-247-231130- /O.CAN.KBOU.FW.A.0018.211123T1800Z-211124T0000Z/ North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 318 AM MST Tue Nov 23 2021 ...FIRE WEATHER WATCH IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR EASTERN ELBERT AND LINCOLN COUNTIES...FIRE WEATHER ZONES 246 AND 247... The National Weather Service in Denver has cancelled the Fire Weather Watch. It will be very dry today with relative humidity falling below 10 percent. However, winds are expected to be less than 25 mph so the Fire Weather Watch has been canceled. $$ COZ240-231900- /O.EXA.KBOU.FW.W.0023.211123T1600Z-211124T0000Z/ North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- 318 AM MST Tue Nov 23 2021 ...RED FLAG WARNING IN EFFECT FROM 9 AM THIS MORNING TO 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR DENVER METRO AREA... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 9 AM this morning to 5 PM MST this afternoon. * Affected Area...Fire Weather Zone 240. * Timing...9 AM to 5 PM MST today. * Winds...West 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...As low as 8 percent. * Impacts...Conditions will be conducive to the rapid spread of new fires. Probability of ignition will increase. Avoid any burning or outdoor activities that may cause sparks, and abide by established fire restrictions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ214>216-238-239-241-242-231900- /O.CON.KBOU.FW.W.0023.211123T1600Z-211124T0000Z/ Central and Southeast Park County- 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- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County- 318 AM MST Tue Nov 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM THIS MORNING TO 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS, SOUTH PARK, PALMER DIVIDE, AND PORTIONS OF THE I-25 URBAN CORRIDOR...FIRE WEATHER ZONES 214... 215...216...238...239...241...AND 242... * Affected Area...Fire Weather Zones 214, 215, 216, 238, 239, 241 and 242. * Timing...9 AM to 5 PM MST today. * Winds...West 15 to 25 mph with gusts up to 45 mph. * Relative Humidity...As low as 8 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. && $$
742 WWUS85 KBOU 231851 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1151 AM MST Tue Nov 23 2021 ...DANGEROUS FIRE WEATHER CONDITIONS EXPECTED TODAY OVER THE FRONT RANGE FOOTHILLS, PALMER DIVIDE, HIGH MOUNTAIN VALLEYS, AND PORTIONS OF THE URBAN CORRIDOR...FIRE ZONES 211, 213, 214, 215, 216, 238, 239, 240, 241, 242, 246, AND 247... COZ211-213-240000- /O.EXA.KBOU.FW.W.0023.000000T0000Z-211124T0000Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- 1151 AM MST Tue Nov 23 2021 ...RED FLAG WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH AND MIDDLE PARK... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect until 5 PM MST this afternoon. * Affected Area...Fire Weather Zones 211 and 213. * Timing...9 AM to 5 PM MST today. * Winds...Southwest 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 15 percent. * Impacts...Conditions will be conducive to the rapid spread of new fires. Probability of ignition will increase. Avoid any burning or outdoor activities that may cause sparks, and abide by established fire restrictions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ214>216-238>242-240000- /O.CON.KBOU.FW.W.0023.000000T0000Z-211124T0000Z/ Central and Southeast Park County- 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- 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- 1151 AM MST Tue Nov 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, FRONT RANGE FOOTHILLS, I-25 CORRIDOR... * Affected Area...Fire Weather Zones 214, 215, 216, 238, 239, 240, 241 and 242. * Timing...9 AM to 5 PM MST today. * Winds...West 15 to 25 mph with gusts up to 45 mph. * Relative Humidity...As low as 7 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. && $$
764 WWUS85 KBOU 232159 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 259 PM MST Tue Nov 23 2021 ...DANGEROUS FIRE WEATHER CONDITIONS EXPECTED THROUGH LATE AFTERNOON OVER THE FRONT RANGE FOOTHILLS, PALMER DIVIDE, HIGH MOUNTAIN VALLEYS, AND PORTIONS OF THE URBAN CORRIDOR...FIRE ZONES 211, 213 THROUGH 216...AND 238 THROUGH 242... COZ211-213>216-238>242-240000- /O.CON.KBOU.FW.W.0023.000000T0000Z-211124T0000Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County- 259 PM MST Tue Nov 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, FRONT RANGE FOOTHILLS, I-25 CORRIDOR... * Affected Area...Fire Weather Zones 211, 213, 214, 215, 216, 238, 239, 240, 241 and 242. * Timing...until 5 PM MST today. * Winds...West 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...As low as 7 percent. * Impacts...Conditions will be conducive to the rapid spread of new fires. Probability of ignition will increase. Avoid any burning or outdoor activities that may cause sparks, and abide by established fire restrictions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
841 WWUS85 KBOU 240019 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 519 PM MST Tue Nov 23 2021 COZ211-213>216-238>242-240130- /O.EXP.KBOU.FW.W.0023.000000T0000Z-211124T0000Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- 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- 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- 519 PM MST Tue Nov 23 2021 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, FRONT RANGE FOOTHILLS, I-25 CORRIDOR... Winds have decreased and relative humidity has increased above 15%. Therefore, the Red Flag Warning was allowed to expire. $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 22, 2:17 AM MST | Fire Weather Watch | BOU | Arapahoe, Boulder, Broomfield, Clear Creek, Douglas, Elbert and 6 more | 25 hr |
Nearby
Red Flag Warnings in Colorado, 2021Every 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; radar from the NEXRAD Level II archive.