Alert archive / Colorado / Red Flag Warnings in 2021
Red Flag Warning 27, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Dec 22, 2021, 3:11 AM MST for 9 counties in Colorado. It took effect at Dec 22, 2021, 5:00 AM MST. It was in force for 12 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
- Dec 22, 2021, 3:11 AM MST (10:11 UTC)
- In effect from
- Dec 22, 2021, 5:00 AM MST
- Expired
- Dec 22, 2021, 5:00 PM MST
- In force
- 12 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Logan County, CO, Park County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 46 km from the middle of the area, began a volume at 10:10 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 00:00Z, 10.2 hours before the alert went out and 155 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
- 3882 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
029 WWUS85 KBOU 221011 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 311 AM MST Wed Dec 22 2021 COZ242-248-221815- /O.NEW.KBOU.FW.W.0027.211222T1800Z-211223T0000Z/ Northeast Weld County-Logan County- 311 AM MST Wed Dec 22 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR HIGHER TERRAIN NEAR THE WYOMING/NEBRASKA BORDER... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 11 AM this morning to 5 PM MST this afternoon. * Affected Area...Fire Weather Zones 242 and 248. * Timing...11 am to 5 pm. * Winds...Southwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 7 percent. * Impacts...Any fires that develop are likely to spread rapidly. Outdoor burning should be avoided, as well as any activities that may cause sparks. 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. && $$ COZ214>216-238-221815- /O.NEW.KBOU.FW.W.0027.211222T1200Z-211223T0000Z/ Central and Southeast Park County- Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 311 AM MST Wed Dec 22 2021 ...RED FLAG WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS AND PARK COUNTY... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect until 5 PM MST this afternoon. * Affected Area...Fire Weather Zones 214, 215, 216 and 238. * Timing...Until 5 pm this afternoon. * Winds...West 15 to 30 mph with gusts up to 60 mph. * Relative Humidity...As low as 8 percent. * Impacts...Any fires that develop are likely to spread rapidly. Outdoor burning should be avoided, as well as any activities that may cause sparks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
2 follow-up statements
083 WWUS85 KBOU 221832 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1132 AM MST Wed Dec 22 2021 COZ242-248-230000- /O.CON.KBOU.FW.W.0027.000000T0000Z-211223T0000Z/ Northeast Weld County-Logan County- 1132 AM MST Wed Dec 22 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR HIGHER TERRAIN NEAR THE WYOMING/NEBRASKA BORDER... * Affected Area...Fire Weather Zones 242 and 248. * Timing...11 am to 5 pm. * Winds...Southwest 15 to 25 mph with gusts up to 35 mph. * Relative Humidity...As low as 7 percent. * Impacts...Any fires that develop are likely to spread rapidly. Outdoor burning should be avoided, as well as any activities that may cause sparks. 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. && $$ COZ214>216-238-230000- /O.CON.KBOU.FW.W.0027.000000T0000Z-211223T0000Z/ Central and Southeast Park County- Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 1132 AM MST Wed Dec 22 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS AND PARK COUNTY... * Affected Area...Fire Weather Zones 214, 215, 216 and 238. * Timing...Until 5 pm this afternoon. * Winds...West 15 to 25 mph with gusts up to 45 mph. * Relative Humidity...As low as 8 percent. * Impacts...Any fires that develop are likely to spread rapidly. Outdoor burning should be avoided, as well as any activities that may cause sparks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
669 WWUS85 KBOU 222357 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 457 PM MST Wed Dec 22 2021 COZ242-248-230100- /O.EXP.KBOU.FW.W.0027.000000T0000Z-211223T0000Z/ Northeast Weld County-Logan County- 457 PM MST Wed Dec 22 2021 ...RED FLAG WARNING WILL EXPIRE AT 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR HIGHER TERRAIN NEAR THE WYOMING/NEBRASKA BORDER... The Red Flag Warning will be allowed to expire. $$ COZ214>216-238-230100- /O.EXP.KBOU.FW.W.0027.000000T0000Z-211223T0000Z/ Central and Southeast Park County- Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 457 PM MST Wed Dec 22 2021 ...RED FLAG WARNING WILL EXPIRE AT 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS AND PARK COUNTY... The Red Flag Warning will be allowed to expire. $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 22, 2:47 AM MST | Winter Storm Watch | BOU | Boulder, Grand, Jackson, Larimer | 12 hr |
| Dec 22, 2:33 PM MST | Winter Storm Warning | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 68 hr |
| Dec 22, 2:33 PM MST | Winter Weather Advisory | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 2 more | 66 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.