Alert archive / Arizona / Red Flag Warnings in 2021
Red Flag Warning 1, NWS Phoenix, AZ
NWS Phoenix, AZ issued this red flag warning at Mar 2, 2021, 1:13 PM MST for 4 counties in Arizona. It took effect at Mar 3, 2021, 11:00 AM MST. It was in force for 7 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Mar 2, 2021, 1:13 PM MST (20:13 UTC)
- In effect from
- Mar 3, 2021, 11:00 AM MST
- Expired
- Mar 3, 2021, 6:00 PM MST
- In force
- 7 hr
- Issued by
- NWS Phoenix, AZ
Counties La Paz County, AZ, Maricopa County, AZ, Pinal County, AZ, Yuma County, AZ
The radar
The Phoenix radar (KIWA), 118 km from the middle of the area, began a volume at 20:12 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 3, 5:00 PM MST | NON-TSTM WND DMG | 1 Wsw Apache Junction, AZ | A SMALL PORTION OF A ROOF APPROXIMATELY 4FT BY 5FT LOST SOME ASPHALT SHINGLES NEAR BROADWAY RD. AND IRONWOOD RD. ESTIMATED WIND GUST OF 50 MPH. TIME ESTIMATED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 8.2 hours before the alert went out and 221 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
- 3702 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
812 WWUS85 KPSR 022013 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 113 PM MST Tue Mar 2 2021 AZZ132-030815- /O.UPG.KPSR.FW.A.0001.210303T1800Z-210304T0100Z/ /O.NEW.KPSR.FW.W.0001.210303T1800Z-210304T0100Z/ Central Deserts- 113 PM MST Tue Mar 2 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 6 PM MST WEDNESDAY FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH TO VERY HIGH FIRE DANGER FOR SOUTHWEST AND SOUTH-CENTRAL ARIZONA... The National Weather Service in Phoenix has issued a Red Flag Warning for strong winds, low relative humidity and high to very high fire danger, which is in effect from 11 AM to 6 PM MST Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Central Deserts. * TIMING...Late Wednesday morning through the afternoon. * WINDS...South 20 to 30 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Fuels are very dry and fire danger is high to very high. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
3 follow-up statements
440 WWUS85 KPSR 030837 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 137 AM MST Wed Mar 3 2021 AZZ132-040100- /O.CON.KPSR.FW.W.0001.210303T1800Z-210304T0100Z/ Central Deserts- 137 AM MST Wed Mar 3 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 6 PM MST THIS EVENING FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH FIRE DANGER FOR FOR SOUTHWEST AND SOUTH-CENTRAL ARIZONA... * AFFECTED AREA...Central Deserts. * TIMING...Late Wednesday morning through the afternoon. * WINDS...South 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Fuels are very dry and fire danger is high to very high. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
016 WWUS85 KPSR 032018 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 118 PM MST Wed Mar 3 2021 AZZ132-040100- /O.CON.KPSR.FW.W.0001.000000T0000Z-210304T0100Z/ Central Deserts- 118 PM MST Wed Mar 3 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH FIRE DANGER FOR FOR SOUTHWEST AND SOUTH-CENTRAL ARIZONA... * AFFECTED AREA...Central Deserts. * TIMING...Late Wednesday morning through the afternoon. * WINDS...South 25 to 35 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 4 percent. * IMPACTS...Fuels are very dry and fire danger is high to very high. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
967 WWUS85 KPSR 040105 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 605 PM MST Wed Mar 3 2021 AZZ132-040215- /O.EXP.KPSR.FW.W.0001.000000T0000Z-210304T0100Z/ Central Deserts- 605 PM MST Wed Mar 3 2021 ...RED FLAG WARNING HAS EXPIRED FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND VERY HIGH FIRE DANGER FOR SOUTHWEST AND SOUTH-CENTRAL ARIZONA... Humidities have improved and will continue to do so the rest of the night. Winds have started to weaken in southwest Arizona and will begin to do so in the next hour or two over south-central Arizona. Thus, the Red Flag Warning has been allowed to expire. $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 2:27 AM MST | Fire Weather Watch | PSR | La Paz, Maricopa, Pinal, Yuma | 11 hr |
| Mar 2, 1:16 PM MST | Wind Advisory | PSR | La Paz, Maricopa, Pinal, Yuma | 31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.