Alert archive / Arizona / Red Flag Warnings in 2021
Red Flag Warning 5, NWS Las Vegas, NV
NWS Las Vegas, NV issued this red flag warning at Apr 20, 2021, 6:56 PM MST for Mohave County, Arizona. It took effect at Apr 21, 2021, 11:00 AM MST. It was in force for 9 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, 6:56 PM MST (01:56 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 Las Vegas, NV
County Mohave County, AZ
The radar
The Las Vegas radar (KESX), 102 km from the middle of the area, began a volume at 01:59 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
Las Vegas, NV (KVEF), launched 00:00Z, 1.9 hours before the alert went out and 177 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
- 4363 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 264 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
201 WWUS85 KVEF 210156 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 656 PM PDT Tue Apr 20 2021 An area of low pressure will enter our region Wednesday, bringing strong southwesterly winds to the eastern Mojave Desert and Arizona Strip, encompassing the majority of Mohave County. Relative humidity values will be critical through the afternoon, resulting in enhanced fire danger through the day. AZZ102-211800- /O.NEW.KVEF.FW.W.0005.210421T1800Z-210422T0300Z/ Northwest Deserts/Northwest Plateau- 656 PM MST Tue Apr 20 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MST WEDNESDAY FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 102 IN ARIZONA... The National Weather Service in Las Vegas has issued a Red Flag Warning, which is in effect from 11 AM to 8 PM MST Wednesday. * AFFECTED AREA...In Arizona...Fire weather zone 102. * TIMING...From 11am to 8pm MST Wednesday. * WIND...Southwest wind 15 to 25 mph with gusts 30 to 35 mph. * HUMIDITY..8 to 15 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. Heed all fire restrictions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ weather.gov/lasvegas
2 follow-up statements
663 WWUS85 KVEF 211809 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 1109 AM PDT Wed Apr 21 2021 AZZ102-220300- /O.CON.KVEF.FW.W.0005.000000T0000Z-210422T0300Z/ Northwest Deserts/Northwest Plateau- 1109 AM MST Wed Apr 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 102 IN ARIZONA... * AFFECTED AREA...In Arizona...Fire weather zone 102. * TIMING...Until 8 PM MST this evening. * WIND...Southwest 20 to 25 mph with gusts 35 to 40 mph. * HUMIDITY..8 to 15 percent. * IMPACTS...A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Any fires that develop will likely spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Outdoor burning is not recommended. Heed all fire restrictions. && $$ weather.gov/lasvegas
198 WWUS85 KVEF 220309 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 809 PM PDT Wed Apr 21 2021 AZZ102-220415- /O.EXP.KVEF.FW.W.0005.000000T0000Z-210422T0300Z/ Northwest Deserts/Northwest Plateau- 809 PM MST Wed Apr 21 2021 ...RED FLAG WARNING HAS EXPIRED FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 102 IN ARIZONA... The warning was allowed to expire as winds have decreased and humidity levels are on the rise. $$ weather.gov/lasvegas
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.