Alert archive / Arizona / Red Flag Warnings in 2021
Red Flag Warning 13, NWS Tucson, AZ
NWS Tucson, AZ issued this red flag warning at Apr 21, 2021, 2:37 PM MST for 6 counties in Arizona. It took effect at Apr 22, 2021, 12:00 PM 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 21, 2021, 2:37 PM MST (21:37 UTC)
- In effect from
- Apr 22, 2021, 12:00 PM MST
- Expired
- Apr 22, 2021, 8:00 PM MST
- In force
- 8 hr
- Issued by
- NWS Tucson, AZ
Counties Cochise County, AZ, Graham County, AZ, Greenlee County, AZ, Pima County, AZ, Pinal County, AZ, Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 61 km from the middle of the area, began a volume at 21:40 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
Tuscon, AZ (KTUS), launched 12:00Z, 9.6 hours before the alert went out and 49 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
- 3916 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
143 WWUS85 KTWC 212137 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 237 PM MST Wed Apr 21 2021 AZZ153-220300- /O.CAN.KTWC.FW.A.0009.210422T1900Z-210423T0300Z/ /O.CON.KTWC.FW.W.0012.000000T0000Z-210422T0300Z/ Arizona Fire Weather Zone 153 Northern Graham County-Northern Greenlee County- White and Gila Mountains-Apache Sitgreaves NF- Southern San Carlos Reservation above 5000 feet-SDC- 237 PM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING FOR STRONG AND GUSTY WINDS, LOW HUMIDITY AND A VERY HIGH FIRE DANGER RATING FOR FIRE WEATHER ZONE 153... ...FIRE WEATHER WATCH IS CANCELLED FOR THURSDAY FOR FIRE WEATHER ZONE 153... The National Weather Service in Tucson has cancelled the Fire Weather Watch on Thursday. * AFFECTED AREA...All of Fire Weather Zone 153. * TIMING...Until 8 PM MST this evening. * WINDS...South to southwest winds of 20 to 30 mph with gusts to 45 mph. * RELATIVE HUMIDITY...Minimum relative humidity values 5 to 15 percent. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be resistant to control efforts. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are expected to develop. A combination of strong winds...low relative humidity...and dry vegetation will create the potential for rapid and erratic fire growth. Please advise the appropriate officials or fire crews in the field of the Red Flag Warning for portions of Southeast Arizona. && $$ AZZ151-152-154-220545- /O.UPG.KTWC.FW.A.0009.210422T1900Z-210423T0300Z/ /O.NEW.KTWC.FW.W.0013.210422T1900Z-210423T0300Z/ /O.CON.KTWC.FW.W.0012.000000T0000Z-210422T0300Z/ Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC-Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 237 PM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING FOR STRONG AND GUSTY WINDS, LOW HUMIDITY AND A VERY HIGH FIRE DANGER RATING FOR FIRE WEATHER ZONES 151, 152 AND 154... ...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM MST THURSDAY FOR STRONG AND GUSTY WINDS, LOW HUMIDITY AND A VERY HIGH FIRE DANGER RATING FOR PORTIONS OF FIRE WEATHER ZONES 151, 152 AND 154... The National Weather Service in Tucson has issued a Red Flag Warning, which is in effect from noon to 8 PM MST Thursday. The Fire Weather Watch is no longer in effect Thursday. * AFFECTED AREA...All of Fire Weather Zones 151, 152 and 154 through 8 PM MST this evening and portions of Fire Weather Zones 151, 152 and 154 Thursday. * TIMING...Until 8 PM MST this evening and Noon to 8 PM MST Thursday. * WINDS...South to southwest winds of 20 to 30 mph with gusts to 45 mph today. Southwest winds of 15 to 30 mph with gusts to 35 to 40 mph on Thursday. * RELATIVE HUMIDITY...Minimum relative humidity values 5 to 10 percent in the valleys and 10 to 15 percent over the higher terrain both today and Thursday. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be resistant to control efforts. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are expected to develop. A combination of strong winds...low relative humidity...and dry vegetation will create the potential for rapid and erratic fire growth. Please advise the appropriate officials or fire crews in the field of the Red Flag Warning for portions of Southeast Arizona. && $$ AZZ150-220300- /O.CON.KTWC.FW.W.0012.000000T0000Z-210422T0300Z/ Arizona Fire Weather Zone 150 Sonoran FDRA-Most of Pima County-South Central Pinal County- Tohono O'odham Nation-Tucson Metropolitan area-TDC- 237 PM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING FOR STRONG AND GUSTY WINDS, LOW HUMIDITY AND A VERY HIGH FIRE DANGER RATING FOR FIRE WEATHER ZONE 150... * AFFECTED AREA...Fire Weather Zone 150. * TIMING...Until 8 PM MST this evening. * WINDS...South to southwest winds of 20 to 30 mph with gusts to 45 mph. * RELATIVE HUMIDITY...Minimum relative humidity values 5 to 10 percent in the valleys and 10 to 15 percent over the higher terrain. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be resistant to control efforts. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are expected to develop. A combination of strong winds...low relative humidity...and dry vegetation will create the potential for rapid and erratic fire growth. Please advise the appropriate officials or fire crews in the field of the Red Flag Warning for portions of Southeast Arizona. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
4 follow-up statements
093 WWUS85 KTWC 220258 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 758 PM MST Wed Apr 21 2021 AZZ151-152-154-221100- /O.EXP.KTWC.FW.W.0012.000000T0000Z-210422T0300Z/ /O.CON.KTWC.FW.W.0013.210422T1900Z-210423T0300Z/ Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC-Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 758 PM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM MST THURSDAY FOR STRONG AND GUSTY WINDS, LOW HUMIDITY AND A VERY HIGH FIRE DANGER RATING FOR FIRE WEATHER ZONES 151, 152, AND 154... ...RED FLAG WARNING WILL EXPIRE AT 8 PM MST THIS EVENING FOR FOR FIRE WEATHER ZONES 151, 152, AND 154... * AFFECTED AREA...Fire weather zone 151, 152 and 154. * TIMING...Noon to 8 PM MST on Thursday. * WINDS...Southwest winds of 15 to 30 mph with gusts to 35 to 40 mph on Thursday. * RELATIVE HUMIDITY...Minimum relative humidity values 5 to 10 percent in the valleys and 10 to 15 percent over the higher terrain on Thursday. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be resistant to control efforts. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are expected to develop. A combination of strong winds...low relative humidity...and dry vegetation will create the potential for rapid and erratic fire growth. Please advise the appropriate officials or fire crews in the field of the Red Flag Warning for portions of Southeast Arizona. && $$ AZZ150-153-220400- /O.EXP.KTWC.FW.W.0012.000000T0000Z-210422T0300Z/ Arizona Fire Weather Zone 150 Sonoran FDRA-Most of Pima County-South Central Pinal County- Tohono O'odham Nation-Tucson Metropolitan area-TDC- Arizona Fire Weather Zone 153 Northern Graham County-Northern Greenlee County- White and Gila Mountains-Apache Sitgreaves NF- Southern San Carlos Reservation above 5000 feet-SDC- 758 PM MST Wed Apr 21 2021 ...RED FLAG WARNING WILL EXPIRE AT 8 PM MST THIS EVENING FOR FIRE WEATHER ZONES 150 AND 153... Winds continued to diminish in speed along with the relative humidity starting to increase. Thus, the warning will expire at 8 PM MST. $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
502 WWUS85 KTWC 221017 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 317 AM MST Thu Apr 22 2021 AZZ151-152-154-222300- /O.CON.KTWC.FW.W.0013.210422T1900Z-210423T0300Z/ Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC-Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 317 AM MST Thu Apr 22 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM MST THIS EVENING FOR STRONG AND GUSTY WINDS, LOW HUMIDITY AND A VERY HIGH FIRE DANGER RATING FOR FIRE WEATHER ZONES 151, 152, AND 154... * AFFECTED AREA...Fire weather zone 151, 152 and 154, south and east of a Nogales to Benson to Safford line. * TIMING...Noon to 8 PM MST today. * WINDS...Southwest winds of 15 to 30 mph with gusts to 40 mph. Stronger gusts possible over higher ridges. * RELATIVE HUMIDITY...Minimum relative humidity values around 10 percent in the valleys and 10 to 18 percent over the higher terrain. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be resistant to control efforts. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are expected to develop. A combination of strong winds...low relative humidity...and very dry vegetation will create the potential for rapid and erratic fire growth. Please advise the appropriate officials or fire crews in the field of the Red Flag Warning for portions of Southeast Arizona. && $$ Cerniglia Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
439 WWUS85 KTWC 222032 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 132 PM MST Thu Apr 22 2021 AZZ151-152-154-230300- /O.CON.KTWC.FW.W.0013.000000T0000Z-210423T0300Z/ Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC-Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 132 PM MST Thu Apr 22 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING FOR STRONG AND GUSTY WINDS, LOW HUMIDITY AND A VERY HIGH FIRE DANGER RATING FOR FIRE WEATHER ZONES 151, 152, AND 154... * AFFECTED AREA...Fire weather zone 151, 152 and 154, south and east of a Nogales to Benson to Safford line. * TIMING...Until 8 PM MST this evening. * WINDS...Southwest winds of 15 to 30 mph with gusts to 40 mph. Stronger gusts possible over higher ridges. * RELATIVE HUMIDITY...Minimum relative humidity values around 10 percent in the valleys and 10 to 18 percent over the higher terrain. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be resistant to control efforts. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are expected to develop. A combination of strong winds...low relative humidity...and very dry vegetation will create the potential for rapid and erratic fire growth. Please advise the appropriate officials or fire crews in the field of the Red Flag Warning for portions of Southeast Arizona. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
634 WWUS85 KTWC 230306 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 806 PM MST Thu Apr 22 2021 AZZ151-152-154-230415- /O.EXP.KTWC.FW.W.0013.000000T0000Z-210423T0300Z/ Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC-Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 806 PM MST Thu Apr 22 2021 ...RED FLAG WARNING HAS EXPIRED FOR FIRE WEATHER ZONES 151, 152, AND 154... Winds continued to diminish in speed along with the relative humidity starting to increase. Thus, the warning expired at 8 PM MST. $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 10:21 AM MST | Blowing Dust Advisory | TWC | Pima, Pinal | 10 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.