Alert archive / Colorado / Red Flag Warnings in 2021
Red Flag Warning 3, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Mar 5, 2021, 2:51 PM MST for 4 counties in Colorado. It took effect at Mar 6, 2021, 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
- Mar 5, 2021, 2:51 PM MST (21:51 UTC)
- In effect from
- Mar 6, 2021, 11:00 AM MST
- Expired
- Mar 6, 2021, 6:00 PM MST
- In force
- 7 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO
The radar
The Goodland radar (KGLD), 159 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 85 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
- 2032 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
402 WWUS85 KBOU 052151 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 251 PM MST Fri Mar 5 2021 COZ248>251-060600- /O.NEW.KBOU.FW.W.0003.210306T1800Z-210307T0100Z/ Logan County-Washington County-Sedgwick County-Phillips County- 251 PM MST Fri Mar 5 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 6 PM MST SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... 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 Saturday. * Affected Area...Fire Weather Zones 248, 249, 250 and 251. * Timing... 11 AM to 6 PM MST Saturday * Winds...South 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 12 percent. * Impacts... Strong winds combined with low relative humidity may cause new fire starts to rapidly spread and grow. 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. && $$
4 follow-up statements
928 WWUS85 KBOU 060549 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1049 PM MST Fri Mar 5 2021 COZ248>251-061800- /O.CON.KBOU.FW.W.0003.210306T1800Z-210307T0100Z/ Logan County-Washington County-Sedgwick County-Phillips County- 1049 PM MST Fri Mar 5 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 6 PM MST SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... * Affected Area...Fire Weather Zones 248, 249, 250 and 251. * Timing... 11 AM to 6 PM MST Saturday * Winds...South 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 12 percent. * Impacts... Strong winds combined with low relative humidity may cause new fire starts to rapidly spread and grow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ Gimmestad
390 WWUS85 KBOU 061154 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 454 AM MST Sat Mar 6 2021 COZ248>251-062200- /O.CON.KBOU.FW.W.0003.210306T1800Z-210307T0100Z/ Logan County-Washington County-Sedgwick County-Phillips County- 454 AM MST Sat Mar 6 2021 ...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 NORTHEAST PLAINS OF COLORADO... * Affected Area...Northeastern Colorado from Sterling and Akron eastward...Fire Weather Zones 248, 249, 250 and 251. * Timing... 11 AM to 6 PM MST Saturday * Winds...South 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 11 percent. * Impacts... Strong winds combined with low relative humidity may cause new fire starts to rapidly spread and grow. 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. && $$ Gimmestad
004 WWUS85 KBOU 062151 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 251 PM MST Sat Mar 6 2021 COZ248>251-070100- /O.CON.KBOU.FW.W.0003.000000T0000Z-210307T0100Z/ Logan County-Washington County-Sedgwick County-Phillips County- 251 PM MST Sat Mar 6 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... * Affected Area...Fire Weather Zones 248, 249, 250 and 251. * Timing... Until 6 PM MST this evening. * Winds...South 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 12 percent. * Impacts... Strong winds combined with low relative humidity may cause new fire starts to rapidly spread and grow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
293 WWUS85 KBOU 070105 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 605 PM MST Sat Mar 6 2021 COZ248>251-070215- /O.EXP.KBOU.FW.W.0003.000000T0000Z-210307T0100Z/ Logan County-Washington County-Sedgwick County-Phillips County- 605 PM MST Sat Mar 6 2021 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... Winds have decreased this evening, and relative humidities have recovered to 20-25 percent, allowing the warning 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.