Alert archive / California / Red Flag Warnings in 2007
Red Flag Warning 7, NWS Las Vegas, NV
NWS Las Vegas, NV issued this red flag warning at May 4, 2007, 3:48 AM PDT for San Bernardino County, California; Mohave County, Arizona. It took effect at May 4, 2007, 10:00 AM PDT. It was in force for 10 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
- May 4, 2007, 3:48 AM PDT (10:48 UTC)
- In effect from
- May 4, 2007, 10:00 AM PDT
- Expired
- May 4, 2007, 8:00 PM PDT
- In force
- 10 hr
- Issued by
- NWS Las Vegas, NV
Counties Mohave County, AZ, San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 48 km from the middle of the area, began a volume at 10:49 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 |
|---|---|---|---|
| May 4, 11:58 AM PDT | NON-TSTM WND GST 45 | Kingman, AZ | |
| May 4, 3:40 PM PDT | NON-TSTM WND GST 58 | Daggett, CA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Mercury/Desert R, NV (KDRA), launched 00:00Z, 10.8 hours before the alert went out and 176 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
- 4672 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS85 KVEF 041048 RFWVEF RED FLAG WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 348 AM PDT FRI MAY 4 2007 AZZ102-CAZ228-042300- /O.UPG.KVEF.FW.A.0004.070504T1600Z-070505T0300Z/ /O.NEW.KVEF.FW.W.0007.070504T1700Z-070505T0300Z/ NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT- 348 AM PDT FRI MAY 4 2007 /348 AM MST FRI MAY 4 2007/ ...RED FLAG WARNING IN EFFECT FROM 10 AM PDT /10 AM MST/ THIS MORNING TO 8 PM PDT /8 PM MST/ THIS EVENING FOR THE SAN BERNARDINO COUNTY DESERTS AND THE NORTHWEST DESERTS OF ARIZONA... THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT FROM 10 AM PDT /10 AM MST/ THIS MORNING TO 8 PM PDT /8 PM MST/ THIS EVENING. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. A STRONG PACIFIC STORM MOVING INTO THE GREAT BASIN WILL PRODUCE STRONG WEST TO SOUTHWEST WINDS ACROSS THE SAN BERNARDINO COUNTY DESERTS AND THE NORTHWEST DESERTS OF ARIZONA THROUGH THIS EVENING. SUSTAINED 20 FOOT WINDS BETWEEN 20 AND 30 MPH WITH GUSTS BETWEEN 40 AND 50 MPH. RELATIVE HUMIDITY VALUES COULD REMAIN ABOVE 15 PERCENT IN WESTERN SAN BERNARDINO COUNTY BUT SHOULD DROP BELOW 15 PERCENT IN CENTRAL AND EASTERN SAN BERNARDINO COUNTY AND IN SOUTHERN MOHAVE COUNTY. A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. $$
2 follow-up statements
000 WWUS85 KVEF 042122 RFWVEF RED FLAG WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 222 PM PDT FRI MAY 4 2007 AZZ102-CAZ228-050300- /O.CON.KVEF.FW.W.0007.000000T0000Z-070505T0300Z/ NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT- 222 PM PDT FRI MAY 4 2007 /222 PM MST FRI MAY 4 2007/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/ THIS EVENING... A RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/ THIS EVENING. A STRONG PACIFIC STORM MOVING INTO THE GREAT BASIN HAS PRODUCED PRODUCED STRONG WEST TO SOUTHWEST WINDS ACROSS THE SAN BERNARDINO COUNTY DESERTS AND MOHAVE COUNTY TODAY. SUSTAINED 20 FOOT WINDS BETWEEN 20 AND 30 MPH WITH GUSTS BETWEEN 40 AND 50 MPH. RELATIVE HUMIDITY VALUES COULD REMAIN ABOVE 15 PERCENT IN WESTERN SAN BERNARDINO COUNTY BUT SHOULD DROP BELOW 15 PERCENT IN CENTRAL AND EASTERN SAN BERNARDINO COUNTY AND IN SOUTHERN MOHAVE COUNTY. A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. $$ PIERCE
000 WWUS85 KVEF 050315 RFWVEF RED FLAG WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 815 PM PDT FRI MAY 4 2007 AZZ102-CAZ228-050415- /O.EXP.KVEF.FW.W.0007.000000T0000Z-070505T0300Z/ NORTHWEST DESERTS/NORTHWEST PLATEAU-MOJAVE DESERT- 815 PM PDT FRI MAY 4 2007 /815 PM MST FRI MAY 4 2007/ ...RED FLAG WARNING HAS EXPIRED... THE RED FLAG WARNING IS NO LONGER IN EFFECT. AUTOMATED SENSORS SHOWED THAT RELATIVE HUMIDITY VALUES HAVE CLIMBED ABOVE 15 PERCENT AT MOST SITES ACROSS THE AREA. RELATIVE HUMIDITY VALUES ARE EXPECTED TO CONTINUE TO INCREASE THROUGHOUT THE NIGHT. $$
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 2:35 PM PDT | Lake Wind Advisory | VEF | San Bernardino | 24 hr |
Nearby
Red Flag Warnings in California, 2007Red Flag Warnings in Arizona, 2007Every red flag warning in 2007
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.