Alert archive / California / Red Flag Warnings in 2012
Red Flag Warning 9, NWS Las Vegas, NV
NWS Las Vegas, NV issued this red flag warning at May 6, 2012, 2:33 PM PDT for San Bernardino County, California; Clark County, Nevada; Mohave County, Arizona. It took effect at May 7, 2012, 8:00 AM PDT. It was in force for 7 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
- May 6, 2012, 2:33 PM PDT (21:33 UTC)
- In effect from
- May 7, 2012, 8:00 AM PDT
- Expired
- May 7, 2012, 3:00 PM PDT
- In force
- 7 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 21:35 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 7, 1:37 PM PDT | NON-TSTM WND DMG | 5 Ene Las Vegas, NV | A DUST DEVIL DEVELOPED IN A DIRT LOT NEAR NELLIS BOULEVARD AND LAKE MEAD BOULEVARD THEN TRACKED SOUTH ALONG NELLIS BOULEVARD PASSING OVER A BANK WHERE IT TOOK OFF ROOF SHINGLES. THE DUST DEVIL THEN MOVED SOUTH DAMAGING CARS IN A PARKING LOT AND ROOF SHINGLES O |
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, 9.6 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
- 4758 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
927 WWUS85 KVEF 062133 RFWVEF URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE LAS VEGAS NV 233 PM PDT SUN MAY 6 2012 AZZ101-CAZ229-NVZ466-071300- /O.UPG.KVEF.FW.A.0005.120507T1800Z-120508T0300Z/ /O.NEW.KVEF.FW.W.0009.120507T1500Z-120507T2200Z/ LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LOWER COLORADO RIVER VALLEY- LAKE MEAD NRA/COLORADO RIVER-NV SIDE- 233 PM PDT SUN MAY 6 2012 /233 PM MST SUN MAY 6 2012/ ...RED FLAG WARNING IN EFFECT FROM 8 AM PDT /8 AM MST/ TO 3 PM PDT /3 PM MST/ MONDAY FOR STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 101...229 AND 466... THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG WARNING FOR STRONG WINDS AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT FROM 8 AM TO 3 PM MONDAY. THIS REPLACES THE FIRE WEATHER WATCH PREVIOUSLY IN EFFECT. * AFFECTED AREA...IN ARIZONA...FIRE WEATHER ZONE 101 LAKE MEAD NRA/COLORADO RIVER-AZ SIDE. IN CALIFORNIA...FIRE WEATHER ZONE 229 LOWER COLORADO RIVER VALLEY. IN NEVADA...FIRE WEATHER ZONE 466 LAKE MEAD NRA/COLORADO RIVER-NV SIDE. THE STRONGEST WINDS ARE EXPECTED ALONG THE STRETCH FROM DAVIS DAM TO NEEDLES. * TIMING...STRONG NORTH WINDS WILL DEVELOP EARLY IN THE MORNING THEN PERSIST THROUGH EARLY AFTERNOON BEFORE GUSTS DECREASE TO LESS THAN 35 MPH. * WIND...NORTH WIND 20 TO 30 MPH WITH GUSTS UP TO 45 MPH. * HUMIDITY...RELATIVE HUMIDITY VALUES ARE EXPECTED TO BE BETWEEN 10 AND 15 PERCENT EARLY MONDAY MORNING AND MINIMUM VALUES WILL DROP TO AROUND 5 PERCENT BY EARLY AFTERNOON. * IMPACTS...THE COMBINATION OF GUSTY WINDS...LOW RELATIVE HUMIDITY AND DRY FUELS WILL CREATE CONDITIONS THAT ARE FAVORABLE FOR EXTREME FIRE BEHAVIOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... PLEASE ADVISE THE APPROPRIATE FIRE WEATHER OFFICIALS IN THE FIELD OF THIS RED FLAG WARNING. && $$ HTTP://WEATHER.GOV/LASVEGAS
2 follow-up statements
262 WWUS85 KVEF 070916 RFWVEF URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE LAS VEGAS NV 216 AM PDT MON MAY 7 2012 AZZ101-CAZ229-NVZ466-072200- /O.CON.KVEF.FW.W.0009.120507T1500Z-120507T2200Z/ LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LOWER COLORADO RIVER VALLEY- LAKE MEAD NRA/COLORADO RIVER-NV SIDE- 216 AM PDT MON MAY 7 2012 /216 AM MST MON MAY 7 2012/ ...RED FLAG WARNING REMAINS IN EFFECT FROM 8 AM PDT /8 AM MST/ THIS MORNING TO 3 PM PDT /3 PM MST/ THIS AFTERNOON FOR STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 101 - 229 AND 466... * AFFECTED AREA...IN ARIZONA...FIRE WEATHER ZONE 101 LAKE MEAD NRA/COLORADO RIVER-AZ SIDE. IN CALIFORNIA...FIRE WEATHER ZONE 229 LOWER COLORADO RIVER VALLEY. IN NEVADA...FIRE WEATHER ZONE 466 LAKE MEAD NRA/COLORADO RIVER-NV SIDE. * TIMING...STRONG NORTH WINDS WILL DEVELOP THIS MORNING THEN PERSIST THROUGH EARLY AFTERNOON BEFORE GUSTS DECREASE TO LESS THAN 35 MPH. * WIND...NORTH WIND 20 TO 30 MPH WITH GUSTS UP TO 45 MPH. * HUMIDITY...RELATIVE HUMIDITY VALUES OF 10 TO 15 PERCENT EARLY THIS MORNING WILL DROP TO AROUND 5 PERCENT BY EARLY AFTERNOON. * IMPACTS...THE COMBINATION OF GUSTY WINDS...LOW RELATIVE HUMIDITY AND DRY FUELS WILL CREATE CONDITIONS THAT ARE FAVORABLE FOR EXTREME FIRE BEHAVIOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... PLEASE ADVISE THE APPROPRIATE FIRE WEATHER OFFICIALS IN THE FIELD OF THIS RED FLAG WARNING. && $$ MORGAN HTTP://WEATHER.GOV/LASVEGAS
572 WWUS85 KVEF 072157 RFWVEF URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE LAS VEGAS NV 257 PM PDT MON MAY 7 2012 AZZ101-CAZ229-NVZ466-072300- /O.EXP.KVEF.FW.W.0009.000000T0000Z-120507T2200Z/ LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-LOWER COLORADO RIVER VALLEY- LAKE MEAD NRA/COLORADO RIVER-NV SIDE- 257 PM PDT MON MAY 7 2012 /257 PM MST MON MAY 7 2012/ ...RED FLAG WARNING WILL EXPIRE AT 3 PM PDT /3 PM MST/ THIS AFTERNOON FOR STRONG WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 101...229 AND 466... AUTOMATED SENSORS ALONG THE COLORADO RIVER VALLEY SHOWED WIND GUSTS HAD GENERALLY DECREASED TO BETWEEN 25 AND 30 MPH WHILE RELATIVE HUMIDITY VALUES REMAINED IN THE SINGLE DIGITS. GUSTS WILL REMAIN BELOW 35 MPH THE REST OF THE DAY AND THE RED FLAG WARNING WILL EXPIRE ON SCHEDULE. NORTH WINDS WITH LOCAL GUSTS UP TO 30 MPH CAN STILL BE EXPECTED THIS EVENING AND OVERNIGHT ALONG THE COLORADO RIVER VALLEY AND RELATIVE HUMIDITY VALUES WILL GRADUALLY RECOVER TO AROUND 25 PERCENT AFTER MIDNIGHT. $$ HTTP://WEATHER.GOV/LASVEGAS
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 2:37 AM PDT | Fire Weather Watch | VEF | San Bernardino | 12 hr |
| May 6, 3:12 PM PDT | Wind Advisory | VEF | 21 hr |
Nearby
Red Flag Warnings in California, 2012Red Flag Warnings in Nevada, 2012Red Flag Warnings in Arizona, 2012Every red flag warning in 2012
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.