Alert archive / Arizona / Red Flag Warnings in 2021
Red Flag Warning 4, NWS Tucson, AZ
NWS Tucson, AZ issued this red flag warning at Mar 20, 2021, 2:02 PM MST for 6 counties in Arizona. It took effect at Mar 21, 2021, 12:00 PM MST. It was in force for 6 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 20, 2021, 2:02 PM MST (21:02 UTC)
- In effect from
- Mar 21, 2021, 12:00 PM MST
- Expired
- Mar 21, 2021, 6:00 PM MST
- In force
- 6 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 21:01 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, 9.0 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
- 3524 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -46 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
236 WWUS85 KTWC 202102 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 202 PM MST Sat Mar 20 2021 AZZ152-154-211000- /O.UPG.KTWC.FW.A.0003.210321T1900Z-210322T0100Z/ /O.NEW.KTWC.FW.W.0004.210321T1900Z-210322T0100Z/ 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- 202 PM MST Sat Mar 20 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 6 PM MST SUNDAY FOR STRONG WINDS, LOW HUMIDITY AND A HIGH FIRE DANGER RATING FOR THE SOUTHEAST PARTS OF FIRE WEATHER ZONES 152 AND 154... The National Weather Service in Tucson has issued a Red Flag Warning, which is in effect from noon to 6 PM MST Sunday. This replaces the Fire Weather Watch. * AFFECTED AREA...For fire weather zone 154, only the Chiricahua Mountains along with the Southeast half of fire weather zone 152. * TIMING...Noon through 6 PM MST. * WINDS...Westerly winds of 15 to 25 mph with gusts to 40 mph in the warning area. * RELATIVE HUMIDITY...Minimum RH 10 to 15 percent in the afternoon. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are possible in the watch area. Listen for later forecasts and possible Red Flag Warnings. && 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
3 follow-up statements
632 WWUS85 KTWC 211037 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 337 AM MST Sun Mar 21 2021 AZZ152-154-212300- /O.CON.KTWC.FW.W.0004.210321T1900Z-210322T0100Z/ Arizona Fire Weather Zone 152 Eastern half Desert Grasslands FDRA including elevations up to 5500 feet in Southwest Graham County and Eastern two thirds of Cochise County-Southern San Carlos Reservation- Southern Greenlee County below 5000 feet-TDC- Arizona Fire Weather Zone 154 Forest Woodlands FDRA including the Sky Islands of Southeast Arizona above 5500 feet-Coronado NF-TDC- 337 AM MST Sun Mar 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 6 PM MST THIS EVENING FOR STRONG WINDS, LOW HUMIDITY AND A HIGH FIRE DANGER RATING FOR THE SOUTHEAST PARTS OF FIRE WEATHER ZONES 152 AND 154... * AFFECTED AREA...For fire weather zone 154, only the Chiricahua Mountains along with the Southeast half of fire weather zone 152. * TIMING...Noon through 6 PM MST. * WINDS...Westerly winds of 15 to 30 mph with gusts to 40 mph in the warning area. * RELATIVE HUMIDITY...Minimum RH 10 to 15 percent in the afternoon. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be difficult to control. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are expected to develop. A combination of strong winds...low relative humidity...and dry vegetation will create the potential for rapid and erratic fire growth. Please advise the appropriate officials or fire crews in the field of the Red Flag Warning for portions of Southeast Arizona. && $$ Cerniglia Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
215 WWUS85 KTWC 212133 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 233 PM MST Sun Mar 21 2021 AZZ152-154-220100- /O.NEW.KTWC.FW.A.0004.210323T1900Z-210324T0200Z/ /O.CON.KTWC.FW.W.0004.000000T0000Z-210322T0100Z/ 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- 233 PM MST Sun Mar 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR STRONG WINDS, LOW HUMIDITY, AND A HIGH FIRE DANGER RATING FOR THE SOUTHEAST PARTS OF FIRE WEATHER ZONES 152 AND 154... ...FIRE WEATHER WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR STRONG WINDS, LOW HUMIDITY, AND A HIGH FIRE DANGER RATING FOR SOUTHERN PARTS OF FIRE WEATHER ZONES 152 AND 154... The National Weather Service in Tucson has issued a Fire Weather Watch, which is in effect from Tuesday afternoon through Tuesday evening. * AFFECTED AREA...Red flag warning this afternoon for fire weather zone 154, only the Chiricahua Mountains along with the southeast half of fire weather zone 152. Fire weather watch Tuesday for the sky islands of fire weather zone 154 in Cochise and Santa Cruz Counties and the southern part of fire weather zone 152. * TIMING...Red flag warning through 6 PM MST today. Fire Weather Watch Tuesday afternoon through Tuesday evening. * WINDS...Westerly winds 15 to 30 mph with gusts to 40 mph in the warning area this afternoon. Tuesday westerly winds 20 to 30 mph with gusts to 40 mph. * RELATIVE HUMIDITY...Minimum RH 10 to 15 percent this afternoon and Tuesday. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be difficult to control. * 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. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. Please advise the appropriate officials or fire crews in the field of the Fire Weather Watch for portions of Southeast Arizona. && $$ AZZ151-220100- /O.NEW.KTWC.FW.A.0004.210323T1900Z-210324T0200Z/ Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC- 233 PM MST Sun Mar 21 2021 ...FIRE WEATHER WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR STRONG WINDS, LOW HUMIDITY, AND A HIGH FIRE DANGER RATING FOR SOUTHERN PARTS OF FIRE WEATHER ZONE 151... The National Weather Service in Tucson has issued a Fire Weather Watch, which is in effect from Tuesday afternoon through Tuesday evening. * AFFECTED AREA...Southern part of fire weather zone 151. * TIMING...Tuesday afternoon through Tuesday evening. * WINDS...Westerly 20 to 30 mph with gusts to 40 mph. * RELATIVE HUMIDITY...Minimum RH 10 to 15 percent. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. Please advise the appropriate officials or fire crews in the field of the Fire Weather Watch for portions of Southeast Arizona. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
808 WWUS85 KTWC 220100 RFWTWC URGENT - FIRE WEATHER MESSAGE National Weather Service Tucson AZ 600 PM MST Sun Mar 21 2021 AZZ152-154-221200- /O.EXP.KTWC.FW.W.0004.000000T0000Z-210322T0100Z/ /O.CON.KTWC.FW.A.0004.210323T1900Z-210324T0200Z/ 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- 600 PM MST Sun Mar 21 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR STRONG WINDS, LOW HUMIDITY, AND A HIGH FIRE DANGER RATING FOR SOUTHERN PARTS OF FIRE WEATHER ZONES 152 AND 154... * AFFECTED AREA...Fire weather watch Tuesday for the sky islands of fire weather zone 154 in Cochise and Santa Cruz Counties and the southern part of fire weather zone 152. * TIMING...Fire Weather Watch Tuesday afternoon through Tuesday evening. * WINDS...Tuesday westerly winds 20 to 30 mph with gusts to 40 mph. * RELATIVE HUMIDITY...Minimum RH 10 to 15 percent Tuesday. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly and be difficult to control. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. Please advise the appropriate officials or fire crews in the field of the Fire Weather Watch for portions of Southeast Arizona. && $$ AZZ151-221200- /O.CON.KTWC.FW.A.0004.210323T1900Z-210324T0200Z/ Arizona Fire Weather Zone 151 Western half Desert Grasslands FDRA including elevations up to 5500 feet in Southeast corner of Pinal County- Extreme Eastern Pima County-Western third of Cochise County- Santa Cruz County-TDC- 600 PM MST Sun Mar 21 2021 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR STRONG WINDS, LOW HUMIDITY, AND A HIGH FIRE DANGER RATING FOR SOUTHERN PARTS OF FIRE WEATHER ZONE 151... * AFFECTED AREA...Southern part of fire weather zone 151. * TIMING...Tuesday afternoon through Tuesday evening. * WINDS...Westerly 20 to 30 mph with gusts to 40 mph. * RELATIVE HUMIDITY...Minimum RH 10 to 15 percent. * IMPACTS...Any fires that develop or are ongoing will have the potential to spread rapidly. * FOR A DETAILED VIEW OF THE HAZARD AREA...Visit weather.gov/Tucson and click on the Detailed Hazards Icon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. Please advise the appropriate officials or fire crews in the field of the Fire Weather Watch for portions of Southeast Arizona. && $$ 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 |
|---|---|---|---|---|
| Mar 20, 3:04 AM MST | Fire Weather Watch | TWC | Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz | 11 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.