Alert archive / Arizona / Red Flag Warnings in 2021
Red Flag Warning 5, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this red flag warning at Apr 20, 2021, 1:53 PM MST for 5 counties in Arizona. It took effect at Apr 21, 2021, 11:00 AM MST. It was in force for 8 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
- Apr 20, 2021, 1:53 PM MST (20:53 UTC)
- In effect from
- Apr 21, 2021, 11:00 AM MST
- Expired
- Apr 21, 2021, 7:00 PM MST
- In force
- 8 hr
- Issued by
- NWS Flagstaff, AZ
Counties Apache County, AZ, Coconino County, AZ, Gila County, AZ, Navajo County, AZ, Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 52 km from the middle of the area, began a volume at 20:53 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.9 hours before the alert went out and 78 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
- 3206 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 176 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
671 WWUS85 KFGZ 202053 RFWFGZ URGENT - FIRE WEATHER MESSAGE National Weather Service Flagstaff AZ 153 PM MST Tue Apr 20 2021 AZZ111>114-139-140-210500- /O.UPG.KFGZ.FW.A.0004.210421T1800Z-210422T0200Z/ /O.NEW.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Chuska Mountains and Defiance Plateau (Fire Weather Zone 111)- Little Colorado River Valley in Coconino County (Fire Weather Zone 112)- Little Colorado River Valley in Navajo County (Fire Weather Zone 113)- Little Colorado River Valley in Apache County (Fire Weather Zone 114)-Black Mesa Area (Fire Weather Zone 139)- Northeast Plateaus and Mesas South of Hwy 264 (Fire Weather Zone 140)- 153 PM MST Tue Apr 20 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 7 PM MST WEDNESDAY DUE TO STRONG WINDS AND LOW RELATIVE HUMIDITY FOR MUCH OF NORTHERN AND EASTERN ARIZONA.. The National Weather Service in Flagstaff has issued a Red Flag Warning due to strong winds and low relative humidity, which is in effect from 11 AM to 7 PM MST Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Locations near Buffalo Pass, Dilkon, Eagar- Springerville, Ganado, Holbrook, Kykotsmovi, Saint Johns, Shonto, Snowflake-Taylor, Tuba City, Window Rock and Winslow. * WINDS...Southwest 20 to 30 mph with gusts up to 45-50 mph. * RELATIVE HUMIDITY...As low as 6 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring or are imminent. A combination of strong winds and low relative humidities can contribute to extreme fire behavior. Please notify field crews of this red flag warning. && $$ AZZ104-105-109-110-116>118-210500- /O.NEW.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Kaibab Plateau (Fire Weather Zone 104)- Marble and Glen Canyons (Fire Weather Zone 105)- Northeast Plateau And Mesas Hwy 264 Northward (Fire Weather Zone 109)-Chinle Valley (Fire Weather Zone 110)- Eastern Mogollon Rim (Fire Weather Zone 116)- White Mountains (Fire Weather Zone 117)- Northern Gila County (Fire Weather Zone 118)- 153 PM MST Tue Apr 20 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 7 PM MST WEDNESDAY DUE TO STRONG WINDS AND LOW RELATIVE HUMIDITY FOR MUCH OF NORTHERN AND EASTERN ARIZONA... The National Weather Service in Flagstaff has issued a Red Flag Warning due to strong winds and low relative humidity, which is in effect from 11 AM to 7 PM MST Wednesday. * AFFECTED AREA...Locations near Alpine, Chinle, Forest Lakes, Fredonia, Heber-Overgaard, Jacob Lake, Kayenta, Page, Payson, Pine-Strawberry, Pinetop-Lakeside, Show Low and Whiteriver. This includes portions of the Apache-Sitgreaves National Forest, Coconino National Forest, Kaibab National Forest and Tonto National Forest. * WINDS...Southwest 20 to 30 mph with gusts up to 45-50 mph. * RELATIVE HUMIDITY...As low as 6 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring or are imminent. A combination of strong winds and low relative humidities can contribute to extreme fire behavior. Please notify field crews of this red flag warning. && $$ For more information from the National Weather Service visit http://weather.gov/flagstaff
5 follow-up statements
331 WWUS85 KFGZ 202108 RFWFGZ URGENT - FIRE WEATHER MESSAGE National Weather Service Flagstaff AZ 208 PM MST Tue Apr 20 2021 AZZ104-105-109>114-116>118-139-140-220200- /O.CON.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Kaibab Plateau (Fire Weather Zone 104)- Marble and Glen Canyons (Fire Weather Zone 105)- Northeast Plateau And Mesas Hwy 264 Northward (Fire Weather Zone 109)-Chinle Valley (Fire Weather Zone 110)- Chuska Mountains and Defiance Plateau (Fire Weather Zone 111)- Little Colorado River Valley in Coconino County (Fire Weather Zone 112)- Little Colorado River Valley in Navajo County (Fire Weather Zone 113)- Little Colorado River Valley in Apache County (Fire Weather Zone 114)-Eastern Mogollon Rim (Fire Weather Zone 116)- White Mountains (Fire Weather Zone 117)- Northern Gila County (Fire Weather Zone 118)- Black Mesa Area (Fire Weather Zone 139)- Northeast Plateaus and Mesas South of Hwy 264 (Fire Weather Zone 140)- 208 PM MST Tue Apr 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 7 PM MST WEDNESDAY FOR MUCH OF NORTHERN AND EASTERN ARIZONA... The National Weather Service in Flagstaff has issued a Red Flag Warning due to strong winds and low relative humidity, which is in effect from 11 AM to 7 PM MST Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Locations near Alpine, Buffalo Pass, Chinle, Dilkon, Eagar-Springerville, Forest Lakes, Fredonia, Ganado, Heber-Overgaard, Holbrook, Jacob Lake, Kayenta, Kykotsmovi, Page, Payson, Pine-Strawberry, Pinetop-Lakeside, Saint Johns, Shonto, Show Low, Snowflake-Taylor, Tuba City, Whiteriver, Window Rock and Winslow. This includes portions of the Apache- Sitgreaves National Forest, Coconino National Forest, Kaibab National Forest and Tonto National Forest. * WINDS...Southwest 20 to 30 mph with gusts up to 40-50 mph. * RELATIVE HUMIDITY...As low as 5 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring or are imminent. A combination of strong winds and low relative humidities can contribute to extreme fire behavior. Please notify field crews of this red flag warning. && $$ For more information from the National Weather Service visit http://weather.gov/flagstaff
249 WWUS85 KFGZ 210214 RFWFGZ URGENT - FIRE WEATHER MESSAGE National Weather Service Flagstaff AZ 714 PM MST Tue Apr 20 2021 AZZ108-137-211015- /O.EXA.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Yavapai County Mountains (Fire Weather Zone 108)- Yavapai County Valleys and Basins (Fire Weather Zone 137)- 714 PM MST Tue Apr 20 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 7 PM MST WEDNESDAY DUE TO STRONG WINDS AND LOW RELATIVE HUMIDITY ACROSS YAVAPAI COUNTY... The National Weather Service in Flagstaff has issued a Red Flag Warning due to strong winds and low relative humidity, which is in effect from 11 AM to 7 PM MST Wednesday. * AFFECTED AREA...Locations near Camp Verde, Chino Valley, Congress, Cottonwood, Paulden, Prescott, Prescott Valley and Seligman. This includes portions of the Coconino National Forest, Prescott National Forest and Tonto National Forest. * WINDS...Southwest 15 to 25 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly. $$ AZZ104-105-109>114-116>118-139-140-211015- /O.CON.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Kaibab Plateau (Fire Weather Zone 104)- Marble and Glen Canyons (Fire Weather Zone 105)- Northeast Plateau And Mesas Hwy 264 Northward (Fire Weather Zone 109)-Chinle Valley (Fire Weather Zone 110)- Chuska Mountains and Defiance Plateau (Fire Weather Zone 111)- Little Colorado River Valley in Coconino County (Fire Weather Zone 112)- Little Colorado River Valley in Navajo County (Fire Weather Zone 113)- Little Colorado River Valley in Apache County (Fire Weather Zone 114)-Eastern Mogollon Rim (Fire Weather Zone 116)- White Mountains (Fire Weather Zone 117)- Northern Gila County (Fire Weather Zone 118)- Black Mesa Area (Fire Weather Zone 139)- Northeast Plateaus and Mesas South of Hwy 264 (Fire Weather Zone 140)- 714 PM MST Tue Apr 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 7 PM MST WEDNESDAY FOR MUCH OF NORTHERN AND EASTERN ARIZONA... * AFFECTED AREA...Locations near Alpine, Buffalo Pass, Chinle, Dilkon, Eagar-Springerville, Forest Lakes, Fredonia, Ganado, Heber-Overgaard, Holbrook, Jacob Lake, Kayenta, Kykotsmovi, Page, Payson, Pine-Strawberry, Pinetop-Lakeside, Saint Johns, Shonto, Show Low, Snowflake-Taylor, Tuba City, Whiteriver, Window Rock and Winslow. This includes portions of the Apache- Sitgreaves National Forest, Coconino National Forest, Kaibab National Forest and Tonto National Forest. * WINDS...Southwest 20 to 30 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...As low as 5 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring or are imminent. A combination of strong winds and low relative humidities can contribute to extreme fire behavior. Please notify field crews of this red flag warning. && $$ For more information from the National Weather Service visit http://weather.gov/flagstaff
834 WWUS85 KFGZ 211047 RFWFGZ URGENT - FIRE WEATHER MESSAGE National Weather Service Flagstaff AZ 347 AM MST Wed Apr 21 2021 AZZ106-107-115-138-220200- /O.EXA.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Grand Canyon Country (Fire Weather Zone 106)- Coconino Plateau (Fire Weather Zone 107)- Western Mogollon Rim (Fire Weather Zone 115)- Oak Creek and Sycamore Canyons (Fire Weather Zone 138)- 347 AM MST Wed Apr 21 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 7 PM MST THIS EVENING DUE TO STRONG WINDS AND LOW RELATIVE HUMIDITY FOR ALL OF CENTRAL AND NORTHERN ARIZONA... The National Weather Service in Flagstaff has issued a Red Flag Warning due to strong winds and low relative humidity, which is in effect from 11 AM this morning to 7 PM MST this evening. * AFFECTED AREA...Locations near Doney Park, Flagstaff, Grand Canyon, North Rim, Sedona, Valle and Williams. This includes portions of the Coconino National Forest, Kaibab National Forest and Prescott National Forest. * WINDS...Southwest 20 to 30 mph, gusts from 40 to 50 mph. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring or are imminent. A combination of strong winds and low relative humidities can contribute to extreme fire behavior. Please notify field crews of this red flag warning. && $$ AZZ104-105-108>114-116>118-137-139-140-220200- /O.CON.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Kaibab Plateau (Fire Weather Zone 104)- Marble and Glen Canyons (Fire Weather Zone 105)- Yavapai County Mountains (Fire Weather Zone 108)- Northeast Plateau And Mesas Hwy 264 Northward (Fire Weather Zone 109)-Chinle Valley (Fire Weather Zone 110)- Chuska Mountains and Defiance Plateau (Fire Weather Zone 111)- Little Colorado River Valley in Coconino County (Fire Weather Zone 112)- Little Colorado River Valley in Navajo County (Fire Weather Zone 113)- Little Colorado River Valley in Apache County (Fire Weather Zone 114)-Eastern Mogollon Rim (Fire Weather Zone 116)- White Mountains (Fire Weather Zone 117)- Northern Gila County (Fire Weather Zone 118)- Yavapai County Valleys and Basins (Fire Weather Zone 137)- Black Mesa Area (Fire Weather Zone 139)- Northeast Plateaus and Mesas South of Hwy 264 (Fire Weather Zone 140)- 347 AM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 7 PM MST THIS EVENING FOR ALL OF CENTRAL AND NORTHERN ARIZONA... * AFFECTED AREA...Locations near Alpine, Buffalo Pass, Camp Verde, Chinle, Chino Valley, Congress, Cottonwood, Dilkon, Eagar- Springerville, Forest Lakes, Fredonia, Ganado, Heber- Overgaard, Holbrook, Jacob Lake, Kayenta, Kykotsmovi, Page, Paulden, Payson, Pine-Strawberry, Pinetop-Lakeside, Prescott, Prescott Valley, Saint Johns, Seligman, Shonto, Show Low, Snowflake-Taylor, Tuba City, Whiteriver, Window Rock and Winslow. This includes portions of the Apache-Sitgreaves National Forest, Coconino National Forest, Kaibab National Forest, Prescott National Forest and Tonto National Forest. * WINDS...Southwest 20 to 30 mph, gusts from 40 to 50 mph. * RELATIVE HUMIDITY...As low as 5 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring or are imminent. A combination of strong winds and low relative humidities can contribute to extreme fire behavior. Please notify field crews of this red flag warning. && $$ For more information from the National Weather Service visit http://weather.gov/flagstaff
502 WWUS85 KFGZ 211050 RFWFGZ URGENT - FIRE WEATHER MESSAGE National Weather Service Flagstaff AZ 350 AM MST Wed Apr 21 2021 AZZ104>118-137>140-220200- /O.CON.KFGZ.FW.W.0005.210421T1800Z-210422T0200Z/ Kaibab Plateau (Fire Weather Zone 104)- Marble and Glen Canyons (Fire Weather Zone 105)- Grand Canyon Country (Fire Weather Zone 106)- Coconino Plateau (Fire Weather Zone 107)- Yavapai County Mountains (Fire Weather Zone 108)- Northeast Plateau And Mesas Hwy 264 Northward (Fire Weather Zone 109)-Chinle Valley (Fire Weather Zone 110)- Chuska Mountains and Defiance Plateau (Fire Weather Zone 111)- Little Colorado River Valley in Coconino County (Fire Weather Zone 112)- Little Colorado River Valley in Navajo County (Fire Weather Zone 113)- Little Colorado River Valley in Apache County (Fire Weather Zone 114)-Western Mogollon Rim (Fire Weather Zone 115)- Eastern Mogollon Rim (Fire Weather Zone 116)- White Mountains (Fire Weather Zone 117)- Northern Gila County (Fire Weather Zone 118)- Yavapai County Valleys and Basins (Fire Weather Zone 137)- Oak Creek and Sycamore Canyons (Fire Weather Zone 138)- Black Mesa Area (Fire Weather Zone 139)- Northeast Plateaus and Mesas South of Hwy 264 (Fire Weather Zone 140)- 350 AM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 7 PM MST THIS EVENING FOR ALL OF CENTRAL AND NORTHERN ARIZONA... * AFFECTED AREA...All of central and northern Arizona. * WINDS...Southwest 20 to 30 mph, gusts from 40 to 50 mph. * RELATIVE HUMIDITY...As low as 5 percent. * IMPACTS...Any fires that start will have the potential to spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring or are imminent. A combination of strong winds and low relative humidities can contribute to extreme fire behavior. Please notify field crews of this red flag warning. && $$ For more information from the National Weather Service visit http://weather.gov/flagstaff
570 WWUS85 KFGZ 220156 RFWFGZ URGENT - FIRE WEATHER MESSAGE National Weather Service Flagstaff AZ 656 PM MST Wed Apr 21 2021 AZZ104>118-137>140-220300- /O.EXP.KFGZ.FW.W.0005.000000T0000Z-210422T0200Z/ Kaibab Plateau (Fire Weather Zone 104)- Marble and Glen Canyons (Fire Weather Zone 105)- Grand Canyon Country (Fire Weather Zone 106)- Coconino Plateau (Fire Weather Zone 107)- Yavapai County Mountains (Fire Weather Zone 108)- Northeast Plateau And Mesas Hwy 264 Northward (Fire Weather Zone 109)-Chinle Valley (Fire Weather Zone 110)- Chuska Mountains and Defiance Plateau (Fire Weather Zone 111)- Little Colorado River Valley in Coconino County (Fire Weather Zone 112)- Little Colorado River Valley in Navajo County (Fire Weather Zone 113)- Little Colorado River Valley in Apache County (Fire Weather Zone 114)-Western Mogollon Rim (Fire Weather Zone 115)- Eastern Mogollon Rim (Fire Weather Zone 116)- White Mountains (Fire Weather Zone 117)- Northern Gila County (Fire Weather Zone 118)- Yavapai County Valleys and Basins (Fire Weather Zone 137)- Oak Creek and Sycamore Canyons (Fire Weather Zone 138)- Black Mesa Area (Fire Weather Zone 139)- Northeast Plateaus and Mesas South of Hwy 264 (Fire Weather Zone 140)- 656 PM MST Wed Apr 21 2021 ...RED FLAG WARNING WILL EXPIRE AT 7 PM MST THIS EVENING FOR ALL OF CENTRAL AND NORTHERN ARIZONA... Widespread critical fire weather conditions will diminish as the winds subside and the RH increases this evening. $$ For more information from the National Weather Service visit http://weather.gov/flagstaff
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 2:04 AM MST | Wind Advisory | FGZ | Apache, Coconino, Navajo, Yavapai | 41 hr |
| Apr 20, 2:10 AM MST | Fire Weather Watch | FGZ | Apache, Coconino, Navajo | 12 hr |
Nearby
Red Flag Warnings in Arizona, 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.