Alert archive / Arizona / Red Flag Warnings in 2011
Red Flag Warning 3, NWS Las Vegas, NV
NWS Las Vegas, NV issued this red flag warning at May 14, 2011, 2:39 PM MST for Mohave County, Arizona. It took effect at May 15, 2011, 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
- May 14, 2011, 2:39 PM MST (21:39 UTC)
- In effect from
- May 15, 2011, 11:00 AM MST
- Expired
- May 15, 2011, 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 21:41 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, 9.7 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
- 3901 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
346 WWUS85 KVEF 142139 RFWVEF URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE LAS VEGAS NV 239 PM PDT SAT MAY 14 2011 AZZ102-151100- /O.UPG.KVEF.FW.A.0004.110515T1800Z-110516T0300Z/ /O.NEW.KVEF.FW.W.0003.110515T1800Z-110516T0300Z/ NORTHWEST DESERTS/NORTHWEST PLATEAU- 239 PM MST SAT MAY 14 2011 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MST SUNDAY FOR STRONG WINDS AND LOW RELATIVE HUMIDITY... THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG WARNING FOR MUCH OF MOHAVE COUNTY ARIZONA FOR STRONG WINDS AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT FROM 11 AM TO 8 PM MST SUNDAY. THIS REPLACES THE FIRE WEATHER WATCH WHICH HAD BEEN IN EFFECT. SOUTHWEST WINDS OF 20 TO 30 MPH WITH GUSTS TO 40 MPH WILL COMBINE WITH MINIMUM RELATIVE HUMIDITIES NEAR 15 PERCENT AND HIGH FIRE DANGER TO BRING CRITICAL FIRE WEATHER CONDITIONS TO MUCH OF MOHAVE COUNTY SUNDAY. WINDS WILL BE STRONGEST AND HUMIDITY WILL BE LOWEST FROM LATE MORNING THROUGH EARLY EVENING...WITH CONDITIONS IMPROVING AFTER SUNSET. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 EXTREME FIRE GROWTH POTENTIAL. && $$ MORGAN
3 follow-up statements
307 WWUS85 KVEF 151018 RFWVEF URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE LAS VEGAS NV 318 AM PDT SUN MAY 15 2011 AZZ102-152300- /O.CON.KVEF.FW.W.0003.110515T1800Z-110516T0300Z/ NORTHWEST DESERTS/NORTHWEST PLATEAU- 318 AM MST SUN MAY 15 2011 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM MST THIS EVENING... A RED FLAG WARNING REMAINS IN EFFECT FOR THE NORTHWEST DESERTS AND NORTHWEST PLATEAU FROM 11 AM THIS MORNING TO 8 PM MST THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY. SOUTHWEST WINDS OF 20 TO 30 MPH WITH GUSTS TO 45 MPH WILL COMBINE WITH MINIMUM RELATIVE HUMIDITIES NEAR 15 PERCENT AND HIGH FIRE DANGER TO BRING CRITICAL FIRE WEATHER CONDITIONS TO MUCH OF MOHAVE COUNTY TODAY. WINDS WILL BE STRONGEST AND HUMIDITY WILL BE LOWEST FROM LATE MORNING THROUGH EARLY EVENING...WITH CONDITIONS IMPROVING AFTER SUNSET. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR ARE IMMINENT. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXTREME FIRE GROWTH POTENTIAL. && $$
330 WWUS85 KVEF 152139 RFWVEF URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE LAS VEGAS NV 239 PM PDT SUN MAY 15 2011 AZZ102-160300- /O.CON.KVEF.FW.W.0003.000000T0000Z-110516T0300Z/ NORTHWEST DESERTS/NORTHWEST PLATEAU- 239 PM MST SUN MAY 15 2011 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING FOR STRONG WINDS AND LOW RELATIVE HUMIDITY... A RED FLAG WARNING REMAINS IN EFFECT FOR MUCH OF MOHAVE COUNTY ARIZONA UNTIL 8 PM THIS EVENING. RELATIVE HUMIDITIES WERE GENERALLY BETWEEN 10 AND 20 PERCENT THIS AFTERNOON...AND SEVERAL STATIONS HAD BEEN REPORTING WIND GUSTS OF 30 TO 50 MPH. THESE MARGINAL CONDITIONS WILL CONTINUE THROUGH THE AFTERNOON BEFORE IMPROVING AFTER SUNSET...SO THE RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 EXTREME FIRE GROWTH POTENTIAL. && $$ MORGAN
545 WWUS85 KVEF 160259 RFWVEF URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE LAS VEGAS NV 759 PM PDT SUN MAY 15 2011 AZZ102-160400- /O.EXP.KVEF.FW.W.0003.000000T0000Z-110516T0300Z/ NORTHWEST DESERTS/NORTHWEST PLATEAU- 759 PM MST SUN MAY 15 2011 ...RED FLAG WARNING WILL EXPIRE AT 8 PM MST THIS EVENING... THE RED FLAG WARNING WILL EXPIRE AT 8 PM MST THIS EVENING FOR THE NORTHWEST PLATEAU AND NORTHWEST DESERTS OF ARIZONA. RELATIVE HUMIDITY VALUES WERE ABOVE 20 PERCENT ACROSS MOST OF NORTHWEST AIRZONA THIS EVENING AND SOUTHWEST WINDS WERE DECREASING. WIND SPEEDS WILL CONTINUE TO DECREASE SIGNIFICANTLY THE REST OF THE EVENING AND CONFORM TO LIGHT DIURNAL PATTERNS AFTER MIDNIGHT. $$
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 2:29 PM MST | Wind Advisory | VEF | Mohave | 30 hr |
Nearby
Red Flag Warnings in Arizona, 2011Every red flag warning in 2011
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.