Alert archive / Colorado / Red Flag Warnings in 2021
Red Flag Warning 13, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Aug 28, 2021, 3:24 AM MDT for Grand County, Jackson County, Colorado. It took effect at Aug 28, 2021, 12:00 PM MDT. 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
- Aug 28, 2021, 3:24 AM MDT (09:24 UTC)
- In effect from
- Aug 28, 2021, 12:00 PM MDT
- Expired
- Aug 28, 2021, 7:00 PM MDT
- In force
- 7 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Grand County, CO, Jackson County, CO
The radar
The Cheyenne radar (KCYS), 147 km from the middle of the area, began a volume at 09:26 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
Grand Junction, CO (KGJT), launched 00:00Z, 9.4 hours before the alert went out and 239 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
- 3684 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
983 WWUS85 KBOU 280924 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 324 AM MDT Sat Aug 28 2021 COZ211-217-282200- /O.NEW.KBOU.FW.W.0013.210828T1800Z-210829T0100Z/ Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- 324 AM MDT Sat Aug 28 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF JACKSON COUNTY...FIRE WEATHER ZONES 211 AND 217... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon today to 7 PM MDT this evening. * Affected Area...Fire Weather Zones 211 and 217. * Timing...Winds will increase with low humidity readings this afternoon. Conditions will improve by 7 pm as winds decrease. * Winds...West 10 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 10 percent. * Impacts...Fires will be able to start easily and spread quickly in the dry and breezy conditions. Avoid any burning or outdoor activity that may produce a spark. 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. && $$
1 follow-up statement
757 WWUS85 KBOU 282057 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 257 PM MDT Sat Aug 28 2021 COZ211-217-290100- /O.CON.KBOU.FW.W.0013.000000T0000Z-210829T0100Z/ Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- 257 PM MDT Sat Aug 28 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF JACKSON COUNTY... FIRE WEATHER ZONES 211 AND 217... * Affected Area...Fire Weather Zones 211 and 217. * Timing...Winds will increase with low humidity readings this afternoon. Conditions will improve by 7 pm as winds decrease. * Winds...West 10 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 11 percent. * Impacts...Fires will be able to start easily and spread quickly in the dry and breezy conditions. Avoid any burning or outdoor activity that may produce a spark. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
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.