Alert archive / California / Red Flag Warnings in 2017
Red Flag Warning 19, NWS Las Vegas, NV
NWS Las Vegas, NV issued this red flag warning at Oct 20, 2017, 3:08 PM PDT for San Bernardino County, California; Clark County, Nevada; Mohave County, Arizona. It took effect at Oct 21, 2017, 12:00 PM PDT. It was in force for 2 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
- Oct 20, 2017, 3:08 PM PDT (22:08 UTC)
- In effect from
- Oct 21, 2017, 12:00 PM PDT
- Expired
- Oct 21, 2017, 2:21 PM PDT
- In force
- 2 hr
- Issued by
- NWS Las Vegas, NV
Counties Mohave County, AZ, San Bernardino County, CA, Clark County, NV
The radar
The Las Vegas radar (KESX), 15 km from the middle of the area, began a volume at 22:13 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 12:00Z, 10.1 hours before the alert went out and 101 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
- 2559 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 259 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
993 WWUS85 KVEF 202208 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 308 PM PDT Fri Oct 20 2017 AZZ101-CAZ229-NVZ466-211200- /O.NEW.KVEF.FW.W.0019.171021T1900Z-171022T0100Z/ Lake Mead NRA/Colorado River-AZ side-Lower Colorado River Valley- Lake Mead NRA/Colorado River-NV side- 308 PM PDT Fri Oct 20 2017 /308 PM MST Fri Oct 20 2017/ ...RED FLAG WARNING IN EFFECT FROM NOON PDT /NOON MST/ TO 6 PM PDT /6 PM MST/ SATURDAY FOR STRONG WINDS AND LOW RH FOR FIRE WEATHER ZONES 101, 229, AND 466... The National Weather Service in Las Vegas has issued a Red Flag Warning, which is in effect from noon PDT /noon MST/ to 6 PM PDT /6 PM MST/ Saturday. * AFFECTED AREA...In Arizona...Fire weather zone 101. In California...Fire weather zone 229. In Nevada...Fire weather zone 466. * TIMING...Winds will increase overnight out of the north and continue through much of Saturday before decreasing late. * WIND...North 15 to 25 mph with gusts to 35 mph. * HUMIDITY...Minimum values 5 to 10 percent from late morning through late afternoon Saturday. * 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. && $$ weather.gov/lasvegas
3 follow-up statements
867 WWUS85 KVEF 210941 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 241 AM PDT Sat Oct 21 2017 AZZ101-CAZ229-NVZ466-211930- /O.CON.KVEF.FW.W.0019.171021T1900Z-171022T0100Z/ Lake Mead NRA/Colorado River-AZ side-Lower Colorado River Valley- Lake Mead NRA/Colorado River-NV side- 241 AM PDT Sat Oct 21 2017 /241 AM MST Sat Oct 21 2017/ ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON PDT /NOON MST/ TODAY TO 6 PM PDT /6 PM MST/ THIS EVENING FOR STRONG WINDS AND LOW RH FOR FIRE WEATHER ZONES 101, 229, AND 466... * AFFECTED AREA...In Arizona...Fire weather zone 101. In California...Fire weather zone 229. In Nevada...Fire weather zone 466. * TIMING...Winds will increase out of the north and continue through much of the day before decreasing late this evening. * WIND...North 15 to 25 mph with gusts to 35 mph. * HUMIDITY...Minimum values 5 to 10 percent from late morning through late afternoon Saturday. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ weather.gov/lasvegas
747 WWUS85 KVEF 211919 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 1219 PM PDT Sat Oct 21 2017 AZZ101-CAZ229-NVZ466-220100- /O.CON.KVEF.FW.W.0019.000000T0000Z-171022T0100Z/ Lake Mead NRA/Colorado River-AZ side-Lower Colorado River Valley- Lake Mead NRA/Colorado River-NV side- 1219 PM PDT Sat Oct 21 2017 /1219 PM MST Sat Oct 21 2017/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM PDT /6 PM MST/ THIS EVENING FOR STRONG WINDS AND LOW RH FOR FIRE WEATHER ZONES 101, 229, AND 466... * AFFECTED AREA...In Arizona...Fire weather zone 101. In California...Fire weather zone 229. In Nevada...Fire weather zone 466. * TIMING...Winds will increase out of the north and continue through much of the day before decreasing late this evening. * WIND...North 15 to 25 mph with gusts to 35 mph. * HUMIDITY...Minimum values 5 to 10 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. && $$ weather.gov/lasvegas
983 WWUS85 KVEF 212121 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 221 PM PDT Sat Oct 21 2017 AZZ101-CAZ229-NVZ466-212230- /O.CAN.KVEF.FW.W.0019.000000T0000Z-171022T0100Z/ Lake Mead NRA/Colorado River-AZ side-Lower Colorado River Valley- Lake Mead NRA/Colorado River-NV side- 221 PM PDT Sat Oct 21 2017 /221 PM MST Sat Oct 21 2017/ ...RED FLAG WARNING IS CANCELLED FOR STRONG WINDS AND LOW RH FOR FIRE WEATHER ZONES 101, 229, AND 466... The National Weather Service in Las Vegas has cancelled the Red Flag Warning. Winds have diminished across the region this afternoon. Therefore the Red Flag Warning has been cancelled. $$ weather.gov/lasvegas
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 20, 8:03 AM PDT | Lake Wind Advisory | VEF | San Bernardino | 30 hr |
| Oct 20, 10:21 AM PDT | High Wind Warning | VEF | Inyo | 3 hr |
| Oct 20, 10:21 AM PDT | Wind Advisory | VEF | Inyo | 10 hr |
Nearby
Red Flag Warnings in California, 2017Red Flag Warnings in Nevada, 2017Red Flag Warnings in Arizona, 2017Every red flag warning in 2017
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.