Alert archive / Colorado / Red Flag Warnings in 2017
Red Flag Warning 4, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Feb 20, 2017, 2:28 PM MST for 19 counties in Colorado. It took effect at Feb 21, 2017, 11:00 AM MST. It was in force for 7 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 20, 2017, 2:28 PM MST (21:28 UTC)
- In effect from
- Feb 21, 2017, 11:00 AM MST
- Expired
- Feb 21, 2017, 6:00 PM MST
- In force
- 7 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, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 22 km from the middle of the area, began a volume at 21:32 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 (KDEN), launched 12:00Z, 9.5 hours before the alert went out and 99 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
- 2580 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
040 WWUS85 KBOU 202128 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 228 PM MST Mon Feb 20 2017 COZ215-216-210530- /O.UPG.KBOU.FW.A.0002.170221T1900Z-170222T0200Z/ /O.NEW.KBOU.FW.W.0004.170221T1800Z-170222T0100Z/ 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- 228 PM MST Mon Feb 20 2017 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 6 PM MST TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS BELOW 7500 FEET... 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 to 6 PM MST Tuesday. The Fire Weather Watch is no longer in effect. * Affected Area...Fire Weather Zones 215 and 216 below 7500 feet. * Timing...Fire Danger will increase by noon on Tuesday and continue into early Tuesday Evening. * Winds...West to Southwest 20 to 30 mph with gusts up to 50 mph. * Relative Humidity...as low as 14 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. 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 very warm temperatures will contribute to extreme fire behavior. && $$ COZ238>251-210530- /O.UPG.KBOU.FW.A.0002.170221T1900Z-170222T0200Z/ /O.NEW.KBOU.FW.W.0004.170221T1800Z-170222T0100Z/ Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 228 PM MST Mon Feb 20 2017 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 6 PM MST TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR the i-25 corridor...northeast and east central plains... The National Weather Service in Denver has issued a Red Flag Warning FOR WIND AND LOW RELATIVE HUMIDITY...which is in effect from 11 AM to 6 PM MST Tuesday. The Fire Weather Watch is no longer in effect. * Affected Area...Fire Weather Zones 238...239...240...241... 242...243...244...245...246...247...248...249...250 and 251. * Timing...Fire Danger will increase by noon on Tuesday and continue into early Tuesday Evening. * Winds...West 15 to 25 mph with gusts of 35 to 45 mph. * Relative Humidity...as low as 11 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and unseasonably warm temperatures will contribute to extreme fire behavior. && $$
5 follow-up statements
538 WWUS85 KBOU 210528 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1028 PM MST Mon Feb 20 2017 COZ215-216-211330- /O.CON.KBOU.FW.W.0004.170221T1800Z-170222T0100Z/ 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- 1028 PM MST Mon Feb 20 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 6 PM MST TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS BELOW 7500 FEET... * Affected Area...Fire Weather Zones 215 and 216. * Timing...Fire Danger will increase by noon on Tuesday and continue into early Tuesday Evening. * Winds...Southwest 15 to 25 mph with gusts up to 55 mph. * Relative Humidity...as low as 14 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. 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 very warm temperatures will contribute to extreme fire behavior. && $$ COZ238>251-211330- /O.CON.KBOU.FW.W.0004.170221T1800Z-170222T0100Z/ Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1028 PM MST Mon Feb 20 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 6 PM MST TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE I-25 CORRIDOR...NORTHEAST AND EAST CENTRAL PLAINS... * Affected Area...Fire Weather Zones 238...239...240...241... 242...243...244...245...246...247...248...249...250 and 251. * Timing...Fire Danger will increase by noon on Tuesday and continue into early Tuesday Evening. * Winds...West 15 to 25 mph with gusts up to 45 mph. * Relative Humidity...as low as 11 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and unseasonably warm temperatures will contribute to extreme fire behavior. && $$
977 WWUS85 KBOU 211307 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 607 AM MST Tue Feb 21 2017 Strong and gusty winds are already occuring in and near the foothills this morning. Throughout the day west winds will pick up from west to east across the Plains, and combined with low relative humidity, dry fuels, and very warm temperatures will result in critical fire danger. COZ215-216-212300- /O.CON.KBOU.FW.W.0004.170221T1800Z-170222T0100Z/ 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- 607 AM MST Tue Feb 21 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS BELOW 7500 FEET... * Affected Area...Fire Weather Zones 215 and 216. * Timing...Fire Danger will increase by noon on Tuesday and continue into early Tuesday Evening. * Winds...Southwest 20 to 30 mph with gusts up to 55 mph. * Relative Humidity...as low as 15 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. 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 very warm temperatures will contribute to extreme fire behavior. && $$ COZ238>251-212300- /O.CON.KBOU.FW.W.0004.170221T1800Z-170222T0100Z/ Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 607 AM MST Tue Feb 21 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE I-25 CORRIDOR...NORTHEAST AND EAST CENTRAL PLAINS... * Affected Area...Fire Weather Zones 238...239...240...241... 242...243...244...245...246...247...248...249...250 and 251. * Timing...Fire Danger will increase by noon on Tuesday and continue into early Tuesday Evening. * Winds...West 15 to 25 mph with gusts up to 45 mph. * Relative Humidity...as low as 11 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and unseasonably warm temperatures will contribute to extreme fire behavior. && $$
827 WWUS85 KBOU 211825 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1125 AM MST Tue Feb 21 2017 Strong and gusty winds will continue in the foothills this afternoon with some gusts to 50 mph. West winds will strengthen across the northeast plains as well this afternoon. The gusty winds combined with low relative humidity, dry fuels, and very warm temperatures will result in critical fire danger. COZ215-216-220100- /O.CON.KBOU.FW.W.0004.000000T0000Z-170222T0100Z/ 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- 1125 AM MST Tue Feb 21 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS BELOW 7500 FEET... * Affected Area...Fire Weather Zones 215 and 216. * Timing...Fire Danger will remain high through 6 pm this evening with a gradual improvement thereafter. * Winds...Southwest 20 to 30 mph with gusts up to 50 mph. * Relative Humidity...as low as 15 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. 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 very warm temperatures will contribute to extreme fire behavior. && $$ COZ238>251-220100- /O.CON.KBOU.FW.W.0004.000000T0000Z-170222T0100Z/ Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1125 AM MST Tue Feb 21 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE I-25 CORRIDOR... NORTHEAST AND EAST CENTRAL PLAINS... * Affected Area...Fire Weather Zones 238...239...240...241... 242...243...244...245...246...247...248...249...250 and 251. * Timing...The fire danger will increase this afternoon and continue into early this evening, with a gradual improvement thereafter. * Winds...West 15 to 25 mph with gusts up to 40 mph, strongest along the northern border. * Relative Humidity...as low as 11 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and unseasonably warm temperatures will contribute to extreme fire behavior. && $$
501 WWUS85 KBOU 212101 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 201 PM MST Tue Feb 21 2017 The fire danger will remain high across the region as gusty winds, low relative humidities, dry fuels, and very warm temperatures will result in critical fire danger. The fire danger will remain high on Wednesday, especially along the Palmer Divide south and southeast of Denver. COZ241-246-247-220515- /O.NEW.KBOU.FW.A.0003.170222T1800Z-170223T0100Z/ /O.CON.KBOU.FW.W.0004.000000T0000Z-170222T0100Z/ 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- 201 PM MST Tue Feb 21 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR eastern Douglas, Elbert and Lincoln Counties... ...FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR eastern Douglas, Elbert and Lincoln Counties... The National Weather Service in Denver has issued a Fire Weather Watch FOR WIND AND LOW RELATIVE HUMIDITY...which is in effect from Wednesday morning through Wednesday afternoon. * Affected Area...Fire Weather Zones 241...246 and 247. * Timing...The fire danger will remain high through 6 pm mst this evening, with a gradual improvement thereafter. Gusty winds and warmer temperatures will produce another round of high fire danger for the area by late Wednesday morning through Wednesday afternoon. * Winds...West 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...as low as 10 percent this afternoon and Wednesday afternoon. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. 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 unseasonably warm temperatures will contribute to extreme fire behavior. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ COZ215-216-220100- /O.CON.KBOU.FW.W.0004.000000T0000Z-170222T0100Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 201 PM MST Tue Feb 21 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR the front range foothills below 7500 feet... * Affected Area...Fire Weather Zones 215 and 216. * Timing...Fire Danger will remain high through 6 pm this evening with a gradual improvement thereafter. * Winds...Southwest 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...as low as 15 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and very warm temperatures will contribute to extreme fire behavior. && $$ COZ238>240-242>245-248>251-220100- /O.CON.KBOU.FW.W.0004.000000T0000Z-170222T0100Z/ 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-Northeast Weld County- Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties-Logan County- Washington County-Sedgwick County-Phillips County- 201 PM MST Tue Feb 21 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR the i-25 corridor and northeast plains... * Affected Area...Fire Weather Zones 238...239...240...242... 243...244...245...248...249...250 and 251. * Timing...The fire danger remain high through 6 pm with a gradual improvement thereafter. * Winds...West 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...as low as 11 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. 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 unseasonably warm temperatures will contribute to extreme fire behavior. && $$
056 WWUS85 KBOU 220108 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 608 PM MST Tue Feb 21 2017 Winds will decrease this evening with some increase in humidity levels so Fire Danger will lessen in most areas. However on Wednesday, Fire Danger will increase once again, especially along the Palmer Divide south and southeast of Denver. COZ241-246-247-220915- /O.EXP.KBOU.FW.W.0004.000000T0000Z-170222T0100Z/ /O.CON.KBOU.FW.A.0003.170222T1800Z-170223T0100Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 608 PM MST Tue Feb 21 2017 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR the Palmer Divide... ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR the Palmer Divide... * Affected Area...Fire Weather Zones 241...246 and 247. * Timing...Gusty winds and warm temperatures will produce another round of high fire danger for the area by late Wednesday morning through Wednesday afternoon. * Winds...West 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...as low as 10 percent. * Impacts...If a fire starts, it will be capable of spreading rapidly through grasses and brush due to the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ COZ215-216-238>240-242>245-248>251-220215- /O.EXP.KBOU.FW.W.0004.000000T0000Z-170222T0100Z/ 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-Northeast Weld County- Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties-Logan County- Washington County-Sedgwick County-Phillips County- 608 PM MST Tue Feb 21 2017 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR the Foothills below 7500 feet and the adjacent plains. Winds will remain gusty tonight in the Foothills however there will be an increase in humidity levels which will lessen the Fire Danger. $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 3:49 AM MST | Fire Weather Watch | BOU | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 13 more | 11 hr |
Nearby
Red Flag Warnings in Colorado, 2017Every red flag warning in 2017
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.