Alert archive / Colorado / Red Flag Warnings in 2021
Red Flag Warning 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Nov 15, 2021, 1:21 PM MST for 12 counties in Colorado. It took effect at Nov 16, 2021, 10:00 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
- Nov 15, 2021, 1:21 PM MST (20:21 UTC)
- In effect from
- Nov 16, 2021, 10:00 AM MST
- Expired
- Nov 16, 2021, 5:00 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, Park County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 36 km from the middle of the area, began a volume at 20:27 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, 8.4 hours before the alert went out and 149 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
- 3052 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 290 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
121 WWUS85 KBOU 152021 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 121 PM MST Mon Nov 15 2021 COZ214-216-239>241-243-245-161300- /O.NEW.KBOU.FW.W.0021.211116T1700Z-211117T0000Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 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- Central and South Weld County- Central and East Adams and Arapahoe Counties- 121 PM MST Mon Nov 15 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 5 PM MST TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR MOST OF THE URBAN CORRIDOR AND NEARBY PLAINS, SOUTHERN FOOTHILLS, AND SOUTH PARK... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM to 5 PM MST Tuesday. * Affected Area...Fire Weather Zones 214, 216, 239, 240, 241, 243 and 245. * Timing...10 AM to 5 PM MST Tuesday. * Winds...West 15 to 25 mph with gusts up to 45 mph. * 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. && $$
2 follow-up statements
480 WWUS85 KBOU 161112 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 412 AM MST Tue Nov 16 2021 COZ214-216-239>241-243-245-170000- /O.CON.KBOU.FW.W.0021.211116T1700Z-211117T0000Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- Central and East Adams and Arapahoe Counties- 412 AM MST Tue Nov 16 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR MOST OF THE URBAN CORRIDOR AND NEARBY PLAINS, SOUTHERN FOOTHILLS, AND SOUTH PARK... * Affected Area...Fire Weather Zones 214, 216, 239, 240, 241, 243 and 245. * Timing...10 AM to 5 PM MST Tuesday. * Winds...West 15 to 25 mph with gusts up to 45 mph. * Relative Humidity...As low as 12 percent. * Impacts...Conditions will be conducive to the rapid spread of new fires. Probability of ignition will increase. Avoid any burning or outdoor activities that may cause sparks, and abide by established fire restrictions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
864 WWUS85 KBOU 170004 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver CO 504 PM MST Tue Nov 16 2021 COZ214-216-239>241-243-245-170115- /O.EXP.KBOU.FW.W.0021.000000T0000Z-211117T0000Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 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- Central and South Weld County- Central and East Adams and Arapahoe Counties- 504 PM MST Tue Nov 16 2021 ...RED FLAG WARNING HAS EXPIRED FOR WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 214, 216, 239, 240, 241, 243, AND 245... Winds are forecast to gradually decrease this evening with relative humidities increase by morning; therefore, the Red Flag Warning has been allowed to expire. $$
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.