Alert archive / Colorado / Red Flag Warnings in 2021
Red Flag Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Feb 8, 2021, 3:48 AM MST for 5 counties in Colorado. It took effect at Feb 8, 2021, 11:00 AM MST. It was in force for 6 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 8, 2021, 3:48 AM MST (10:48 UTC)
- In effect from
- Feb 8, 2021, 11:00 AM MST
- Expired
- Feb 8, 2021, 5:00 PM MST
- In force
- 6 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Jefferson County, CO, Park County, CO
The radar
The Denver radar (KFTG), 80 km from the middle of the area, began a volume at 10:46 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, 10.8 hours before the alert went out and 191 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
- 4001 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
764 WWUS85 KBOU 081048 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 348 AM MST Mon Feb 8 2021 ...Critical fire conditions for the southern Foothills today... .A narrow corridor of warm and dry conditions is expected today over the southern Foothills. As winds and wind gusts increase later this morning and into the afternoon, critical fire conditions will develop. Fire danger will lessen this evening and overnight as winds subside and relative humidity increases. COZ216-081900- /O.NEW.KBOU.FW.W.0002.210208T1800Z-210209T0000Z/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 348 AM MST Mon Feb 8 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FOOTHILLS... 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 Zone 216. * Timing...11 AM to 5 PM MST Monday. * Winds...West 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 13 percent. * Impacts...Strong winds combined with low relative humidity may cause new fire starts to rapidly spread and grow where. 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. && $$
2 follow-up statements
468 WWUS85 KBOU 081849 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1149 AM MST Mon Feb 8 2021 ...Critical fire conditions for the southern Foothills today... .A narrow corridor of warm and dry conditions will persist over the southern Foothills through this afternoon. The fire danger will lessen this evening and overnight as winds subside and relative humidity increases. COZ216-090000- /O.CON.KBOU.FW.W.0002.000000T0000Z-210209T0000Z/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 1149 AM MST Mon Feb 8 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FOOTHILLS... * Affected Area...Fire Weather Zone 216. * Timing...11 AM to 5 PM MST Monday. * Winds...West 20 to 30 mph with gusts up to 50 mph. * Relative Humidity...As low as 13 percent. * Impacts...Strong winds combined with low relative humidity may cause new fire starts to rapidly spread and grow where. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
026 WWUS85 KBOU 082359 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 459 PM MST Mon Feb 8 2021 COZ216-090100- /O.EXP.KBOU.FW.W.0002.000000T0000Z-210209T0000Z/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 459 PM MST Mon Feb 8 2021 ...RED FLAG WARNING WILL EXPIRE AT 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FRONT RANGE FOOTHILLS...FIRE WEATHER ZONE 216... Winds are decreasing early this evening, and mostly light winds are expected overnight. $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 7, 5:04 PM MST | Winter Weather Advisory | BOU | Park | 7 hr |
| Feb 8, 2:37 PM MST | Winter Weather Advisory | BOU | Boulder, Grand, Jackson, Larimer | 44 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.