Alert archive / Arizona / Red Flag Warnings in 2021
Red Flag Warning 2, NWS Phoenix, AZ
NWS Phoenix, AZ issued this red flag warning at Apr 20, 2021, 1:21 PM MST for 5 counties in Arizona. It took effect at Apr 21, 2021, 11:00 AM MST. It was in force for 9 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
- Apr 20, 2021, 1:21 PM MST (20:21 UTC)
- In effect from
- Apr 21, 2021, 11:00 AM MST
- Expired
- Apr 21, 2021, 8:00 PM MST
- In force
- 9 hr
- Issued by
- NWS Phoenix, AZ
Counties Gila County, AZ, La Paz County, AZ, Maricopa County, AZ, Pinal County, AZ, Yuma County, AZ
The radar
The Phoenix radar (KIWA), 78 km from the middle of the area, began a volume at 20:22 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 |
|---|---|---|---|
| Apr 21, 11:20 AM MST | NON-TSTM WND GST 40 | 9 Se Queen Creek, AZ | VISIBILITY 1 MILE IN BLOWING DUST. |
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, 8.4 hours before the alert went out and 197 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
- 3454 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
686 WWUS85 KPSR 202021 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 121 PM MST Tue Apr 20 2021 AZZ133-211200- /O.UPG.KPSR.FW.A.0002.210421T1800Z-210422T0100Z/ /O.NEW.KPSR.FW.W.0002.210421T1800Z-210422T0300Z/ Southern Gila County/Tonto National Forest Foothills- 121 PM MST Tue Apr 20 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MST WEDNESDAY FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH FIRE DANGER FOR SOUTHERN GILA COUNTY... The National Weather Service in Phoenix has issued a Red Flag Warning for strong winds, low relative humidity and high fire danger, which is in effect from 11 AM to 8 PM MST Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Southern Gila County/Tonto National Forest Foothills. * TIMING...Wednesday morning through Wednesday afternoon. * WINDS...Southwest 15 to 25 mph with gusts of 30 to 40 mph. Isolated stronger gusts up to 45 mph cannot be ruled out. * RELATIVE HUMIDITY...As low as 5 percent. * IMPACTS...Fuels are dry and fire danger is high. These conditions combined with low relative humidity and strong winds may lead to widespread hazardous fire weather conditions. * IMPACTS...Fuels are dry and fire danger is anticipated to be 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. && $$ AZZ132-211200- /O.NEW.KPSR.FW.W.0002.210421T1800Z-210422T0300Z/ Central Deserts- 121 PM MST Tue Apr 20 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MST WEDNESDAY FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH FIRE DANGER FOR MARICOPA COUNTY AND NORTHERN PINAL COUNTY... The National Weather Service in Phoenix has issued a Red Flag Warning for strong winds, low relative humidity and high fire danger, which is in effect from 11 AM to 8 PM MST Wednesday. * AFFECTED AREA...Central Deserts to include all of Maricopa County and northern Pinal County. * TIMING... * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 7 percent. * IMPACTS...Fuels are dry and fire danger is high. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
3 follow-up statements
273 WWUS85 KPSR 210846 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 146 AM MST Wed Apr 21 2021 AZZ132-133-212315- /O.CON.KPSR.FW.W.0002.210421T1800Z-210422T0300Z/ Central Deserts- Southern Gila County/Tonto National Forest Foothills- 146 AM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM MST THIS EVENING FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH FIRE DANGER FOR MARICOPA COUNTY, NORTHERN PINAL COUNTY, AND SOUTHERN GILA COUNTY... * AFFECTED AREA...Central Deserts including all of Maricopa County and northern Pinal County and Southern Gila County/Tonto National Forest Foothills. * TIMING...Late this morning through early evening. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 6 percent. * IMPACTS...Fuels are dry and fire danger is high. These conditions combined with low relative humidity and strong winds may 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. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
146 WWUS85 KPSR 212034 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 134 PM MST Wed Apr 21 2021 AZZ132-133-220300- /O.CON.KPSR.FW.W.0002.000000T0000Z-210422T0300Z/ Central Deserts- Southern Gila County/Tonto National Forest Foothills- 134 PM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND HIGH FIRE DANGER IN SOUTHERN GILA COUNTY, MARICOPA COUNTY, AND PINAL COUNTY... * AFFECTED AREA...Central Deserts and Southern Gila County/Tonto National Forest Foothills. * TIMING...Until 8 pm tonight. * WINDS...Southwest 15 to 25 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 5 percent. * IMPACTS...Fuels are dry and fire danger is high. These conditions combined with low relative humidity and strong winds may lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
822 WWUS85 KPSR 220308 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 808 PM MST Wed Apr 21 2021 AZZ132-133-220415- /O.EXP.KPSR.FW.W.0002.000000T0000Z-210422T0300Z/ Central Deserts- Southern Gila County/Tonto National Forest Foothills- 808 PM MST Wed Apr 21 2021 ...RED FLAG WARNING HAS EXPIRED FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND VERY HIGH TO EXTREME FIRE DANGER FOR SOUTH-CENTRAL ARIZONA... Winds have weakened below Red Flag thresholds and will continue to do so. In addition, humidities have begun to increase and are expected to improve as the night progresses. $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
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.