Alert archive / California / Red Flag Warnings in 2017
Red Flag Warning 21, NWS Las Vegas, NV
NWS Las Vegas, NV issued this red flag warning at Dec 7, 2017, 3:24 AM PST for San Bernardino County, California; Mohave County, Arizona; Clark County, Nevada. It was in force for 12 hr. 2 reports 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
- Dec 7, 2017, 3:24 AM PST (11:24 UTC)
- Expired
- Dec 7, 2017, 3:00 PM PST
- In force
- 12 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 11:29 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 |
|---|---|---|---|
| Dec 7, 8:53 AM PST | NON-TSTM WND GST 55 | 2 E Ontario, CA | ASOS STATION ONT, ONTARIO AIRPORT. |
| Dec 7, 11:15 AM PST | NON-TSTM WND GST 64 | 2 Nw Running Springs, CA | MESONET STATION HHPC1, RUNNING SPRINGS (2 NW). |
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 00:00Z, 11.4 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
- 3322 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
085 WWUS85 KVEF 071124 RFWVEF URGENT - FIRE WEATHER MESSAGE National Weather Service Las Vegas NV 324 AM PST Thu Dec 7 2017 AZZ101-CAZ229-NVZ466-072300- /O.NEW.KVEF.FW.W.0021.171207T1124Z-171207T2300Z/ Lake Mead NRA/Colorado River-AZ side-Lower Colorado River Valley- Lake Mead NRA/Colorado River-NV side- 324 AM PST Thu Dec 7 2017 /424 AM MST Thu Dec 7 2017/ ...RED FLAG WARNING IN EFFECT UNTIL 3 PM PST /4 PM MST/ THIS AFTERNOON FOR LOW RELATIVE HUMIDITY AND GUSTY NORTH WINDS... The National Weather Service in Las Vegas has issued a Red Flag Warning, which is in effect until 3 PM PST /4 PM MST/ this afternoon. * AFFECTED AREA...In Arizona...Fire weather zone 101.In California...Fire weather zone 229.In Nevada...Fire weather zone 466. * TIMING...Strong wind gusts will persist from this morning through early afternoon before gradually decreasing. * WIND...North gusts 35 to 45 mph from Lake Mohave to Lake Havasu. * HUMIDITY...12 to 15 percent this morning lowering to 8 to 10 percent early this afternoon. * IMPACTS...A combination of strong winds and low relative humidity can contribute to extreme fire behavior. Any fires that develop will likely spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... Outdoor burning is not recommended. && $$ weather.gov/lasvegas
Nearby
Red Flag Warnings in California, 2017Red Flag Warnings in Arizona, 2017Red Flag Warnings in Nevada, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.