Alert archive / Nevada / Red Flag Warnings in 2021
Red Flag Warning 6, NWS Las Vegas, NV
NWS Las Vegas, NV issued this red flag warning at Apr 23, 2021, 12:38 PM MST for Mohave County, Arizona; Clark County, Lincoln County, Nye County, Nevada; San Bernardino County, California. It took effect at Apr 24, 2021, 11:00 AM MST. It was in force for 33 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 23, 2021, 12:38 PM MST (19:38 UTC)
- In effect from
- Apr 24, 2021, 11:00 AM MST
- Expired
- Apr 25, 2021, 8:00 PM MST
- In force
- 33 hr
- Issued by
- NWS Las Vegas, NV
Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV, Lincoln County, NV, Nye County, NV
The radar
The Las Vegas radar (KESX), 94 km from the middle of the area, began a volume at 19:42 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 25, 1:27 PM MST | NON-TSTM WND GST 61 | 3 Sw Mercury, NV | PEAK WIND GUST OF 61 MPH. GUSTS OF THIS MAGNITUDE OCCURRED BETWEEN 127 PM AND 207 PM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 7.6 hours before the alert went out and 28 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
- 3889 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
949 WWUS85 KVEF 231938 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 1238 PM PDT Fri Apr 23 2021 AZZ101-102-CAZ229-NVZ461>466-241200- /O.UPG.KVEF.FW.A.0004.210424T1800Z-210426T0300Z/ /O.NEW.KVEF.FW.W.0006.210424T1800Z-210426T0300Z/ Lake Mead NRA/Colorado River-AZ side- Northwest Deserts/Northwest Plateau-Lower Colorado River Valley- Lincoln County/Ely Dispatch-Nye County Deserts/Las Vegas Dispatch- Sheep Range-Spring Mountains- Clark and SW Lincoln County Deserts/Las Vegas Dispatch- Lake Mead NRA/Colorado River-NV side- 1238 PM PDT Fri Apr 23 2021 /1238 PM MST Fri Apr 23 2021/ ...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 8 PM SUNDAY FOR STRONG WINDS AND LOW HUMIDITY FOR SOUTHERN NEVADA AND NORTHWEST ARIZONA... * AFFECTED AREA...In Arizona...Fire weather zones 101 and 102. In California...Fire weather zone 229. In Nevada...Fire weather zones 461, 462, 463, 464, 465, and 466. * TIMING...Late Saturday morning through Sunday evening. * WIND...South-southwest 15-25 mph with gusts to 40 mph Saturday and 20-30 mph with gusts over 50 mph on Sunday. Winds will not be as strong overnight but will remain gusty. * HUMIDITY...Minimum humidity 7-15 percent Saturday afternoon and slightly higher Sunday afternoon. Humidity will recovery to greater than 15 percent Saturday night. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. 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. && $$ weather.gov/lasvegas
4 follow-up statements
855 WWUS85 KVEF 241201 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 501 AM PDT Sat Apr 24 2021 AZZ101-102-CAZ229-NVZ461>466-250000- /O.CON.KVEF.FW.W.0006.210424T1800Z-210426T0300Z/ Lake Mead NRA/Colorado River-AZ side- Northwest Deserts/Northwest Plateau-Lower Colorado River Valley- Lincoln County/Ely Dispatch-Nye County Deserts/Las Vegas Dispatch- Sheep Range-Spring Mountains- Clark and SW Lincoln County Deserts/Las Vegas Dispatch- Lake Mead NRA/Colorado River-NV side- 501 AM PDT Sat Apr 24 2021 /501 AM MST Sat Apr 24 2021/ ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM SUNDAY FOR STRONG WINDS AND LOW HUMIDITY FOR SOUTHERN NEVADA AND NORTHWEST ARIZONA... * AFFECTED AREA...In Arizona...Fire weather zones 101 and 102. InCalifornia...Fire weather zone 229. In Nevada...Fire weather zones 461, 462, 463, 464, 465, and 466. * TIMING...Late Saturday morning through Sunday evening. * WIND...South-southwest 15-25 mph with gusts to 40 mph Saturday and 20-30 mph with gusts over 50 mph on Sunday. Winds will not be as strong overnight but will remain gusty. * HUMIDITY...Minimum humidity 7-15 percent Saturday afternoon andslightly higher Sunday afternoon. Humidity will recovery to greater than 15 percent Saturday night. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ weather.gov/lasvegas
113 WWUS85 KVEF 242315 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 415 PM PDT Sat Apr 24 2021 AZZ101-102-CAZ229-NVZ461>466-251200- /O.CON.KVEF.FW.W.0006.000000T0000Z-210426T0300Z/ Lake Mead NRA/Colorado River-AZ side- Northwest Deserts/Northwest Plateau-Lower Colorado River Valley- Lincoln County/Ely Dispatch-Nye County Deserts/Las Vegas Dispatch- Sheep Range-Spring Mountains- Clark and SW Lincoln County Deserts/Las Vegas Dispatch- Lake Mead NRA/Colorado River-NV side- 415 PM PDT Sat Apr 24 2021 /415 PM MST Sat Apr 24 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/ SUNDAY FOR STRONG WINDS AND LOW HUMIDITY FOR SOUTHERN NEVADA AND NORTHWEST ARIZONA... * AFFECTED AREA...In Arizona...Fire weather zones 101 and 102. In California...Fire weather zone 229. In Nevada...Fire weather zones 461, 462, 463, 464, 465, and 466. * TIMING...Through Sunday evening. * WIND...South-southwest 15-30 mph with gusts to 40 mph into this evening. Local gusts over 50 mph possible. Winds will not be as strong overnight but will remain gusty. * HUMIDITY...Minimum humidity 7-15 percent but will be slightly higher Sunday. Humidity will recovery to greater than 15 percent tonight. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. 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. && $$ weather.gov/lasvegas
125 WWUS85 KVEF 251155 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 455 AM PDT Sun Apr 25 2021 AZZ101-102-CAZ229-NVZ461>466-260300- /O.CON.KVEF.FW.W.0006.000000T0000Z-210426T0300Z/ Lake Mead NRA/Colorado River-AZ side- Northwest Deserts/Northwest Plateau-Lower Colorado River Valley- Lincoln County/Ely Dispatch-Nye County Deserts/Las Vegas Dispatch- Sheep Range-Spring Mountains- Clark and SW Lincoln County Deserts/Las Vegas Dispatch- Lake Mead NRA/Colorado River-NV side- 455 AM PDT Sun Apr 25 2021 /455 AM MST Sun Apr 25 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR SOUTHERN NEVADA AND NORTHWEST ARIZONA... * AFFECTED AREA...In Arizona...Fire weather zones 101 and 102. In California...Fire weather zone 229. In Nevada...Fire weather zones 461, 462, 463, 464, 465, and 466. * TIMING...Through this evening. * WIND...Winds will increase this morning and become south- southwest 15-30 mph with gusts to 40 mph which will continue into this evening. Local gusts over 50 mph possible. * HUMIDITY...Minimum humidity 8-15 percent. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ weather.gov/lasvegas
641 WWUS85 KVEF 260233 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 733 PM PDT Sun Apr 25 2021 AZZ101-102-CAZ229-NVZ461>466-260345- /O.EXP.KVEF.FW.W.0006.000000T0000Z-210426T0300Z/ Lake Mead NRA/Colorado River-AZ side- Northwest Deserts/Northwest Plateau-Lower Colorado River Valley- Lincoln County/Ely Dispatch-Nye County Deserts/Las Vegas Dispatch- Sheep Range-Spring Mountains- Clark and SW Lincoln County Deserts/Las Vegas Dispatch- Lake Mead NRA/Colorado River-NV side- 733 PM PDT Sun Apr 25 2021 /733 PM MST Sun Apr 25 2021/ ...RED FLAG WARNING WILL EXPIRE AT 8 PM PDT /8 PM MST/ THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR SOUTHERN NEVADA AND NORTHWEST ARIZONA... Relative humidity values have been slowly increasing and the wind speeds have begun to trend lower in most locations. The red flag warning will be allowed to expire at 8 pm. However, gusty southwest winds will continue for the remainder of the evening hours before diminishing further overnight. $$ weather.gov/lasvegas
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 3:15 AM MST | Wind Advisory | VEF | Mohave | 3 days |
Nearby
Red Flag Warnings in Nevada, 2021Red Flag Warnings in Arizona, 2021Red Flag Warnings in California, 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.