Red Flag Warning 24, NWS Las Vegas, NV

000 
WWUS85 KVEF 210346
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
840 PM PDT TUE MAY 20 2008

.GUSTY SOUTHWEST WINDS WILL COMBINE WITH HOT AND DRY WEATHER TO
PRODUCE CRITICAL FIRE WEATHER CONDITIONS OVER MUCH OF SOUTHEAST
CALIFORNIA...SOUTHERN NEVADA AND NORTHWEST ARIZONA THIS EVENING
AS A LOW PRESSURE SYSTEM MOVES INTO NORTHERN CALIFORNIA. THIS
SAME SYSTEM WILL PROVIDE GUSTY NORTH TO NORTHWEST WINDS ON
WEDNESDAY. RELATIVE HUMIDITIES LEVELS WILL INCREASE TOMORROW...
BUT ELEVATIONS BELOW 6000 FEET IN SOUTHEAST CALIFORNIA AND
EXTREME SOUTHERN NEVADA WILL ONCE AGAIN SEE VALUES DROP BELOW
15 PERCENT.

CAZ226-228-NVZ465-210900-
/O.EXT.KVEF.FW.W.0023.000000T0000Z-080521T0900Z/
/O.CON.KVEF.FW.W.0024.080521T1900Z-080522T0300Z/
OWENS VALLEY/SOUTHERN INYO FOREST-MOJAVE DESERT-
CLARK AND SW LINCOLN COUNTY DESERTS/LAS VEGAS DISPATCH-
840 PM PDT TUE MAY 20 2008

...RED FLAG WARNING NOW IN EFFECT UNTIL 2 AM PDT WEDNESDAY...
...RED FLAG WARNING REMAINS IN EFFECT FROM 12 PM TO 8 PM PDT
WEDNESDAY...

THE RED FLAG WARNING IS NOW IN EFFECT UNTIL 2 AM PDT WEDNESDAY. A
RED FLAG WARNING REMAINS IN EFFECT FROM 12 PM TO 8 PM PDT
WEDNESDAY. 

STRONG WINDS WERE PERSISTING THIS EVENING WHILE RELATIVE HUMIDITY 
VALUES WERE VERY SLOW TO RISE. RELATIVE HUMIDITIES WERE STILL 
HOVERING AROUND 10 PERCENT ACROSS MUCH OF THE AREA AS OF 8 PM. 
THEREFORE THE RED FLAG WARNING HAS BEEN EXTENDED UNTIL 2 AM.

A STRONG COLD FRONT WILL SWITCH THE WINDS TO THE NORTHWEST
OVERNIGHT BUT WIND GUSTS WILL CONTINUE TO BLOW UP TO 40 MPH
DURING THE DAY ON WEDNESDAY. RELATIVE HUMIDITIES WILL BE HIGHER
TOMORROW...BUT ELEVATIONS BELOW 6000 FEET WILL ONCE AGAIN SEE
RELATIVE HUMIDITIES FALL BELOW 15 PERCENT THROUGHOUT THE
AFTERNOON AND INTO THE EARLY EVENING HOURS.

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.

$$

AZZ102-NVZ460>464-210900-
/O.EXT.KVEF.FW.W.0023.000000T0000Z-080521T0900Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-
ESMERALDA AND NYE COUNTY DESERTS/CNC DISPATCH-
LINCOLN COUNTY/ELY DISPATCH-NYE COUNTY DESERTS/LAS VEGAS DISPATCH-
SHEEP RANGE-SPRING MOUNTAINS-
840 PM PDT TUE MAY 20 2008 /840 PM MST TUE MAY 20 2008/

...RED FLAG WARNING NOW IN EFFECT UNTIL 2 AM PDT /2 AM MST/
WEDNESDAY...

THE RED FLAG WARNING IS NOW IN EFFECT UNTIL 2 AM PDT /2 AM MST/
WEDNESDAY. 

STRONG WINDS WERE PERSISTING THIS EVENING WHILE RELATIVE HUMIDITY 
VALUES WERE VERY SLOW TO RISE. RELATIVE HUMIDITIES WERE STILL 
HOVERING AROUND 10 PERCENT ACROSS MUCH OF THE AREA AS OF 8 PM. 
THEREFORE THE RED FLAG WARNING HAS BEEN EXTENDED UNTIL 2 AM.

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.

$$

CAZ227-210900-
/O.CON.KVEF.FW.W.0024.080521T1900Z-080522T0300Z/
DEATH VALLEY NATIONAL PARK-
840 PM PDT TUE MAY 20 2008

...RED FLAG WARNING REMAINS IN EFFECT FROM 12 PM TO 8 PM PDT
WEDNESDAY...

A RED FLAG WARNING REMAINS IN EFFECT FROM 12 PM TO 8 PM PDT
WEDNESDAY. 

A STRONG COLD FRONT WILL PROVIDE A WIND SHIFT TO THE NORTHWEST
OVERNIGHT. NORTHWEST WINDS WILL GUST THROUGHOUT THE DAY AT 40 TO
45 MPH. RELATIVE HUMIDITIES WILL BE HIGHER TOMORROW...BUT
ELEVATIONS BELOW 6000 FEET WILL ONCE AGAIN SEE RELATIVE
HUMIDITIES FALL BELOW 15 PERCENT THROUGHOUT THE AFTERNOON AND
INTO THE EARLY EVENING HOURS.

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.

$$

000 
WWUS85 KVEF 210846
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
146 AM PDT WED MAY 21 2008

.A LOW PRESSURE SYSTEM MOVING INTO NORTHERN CALIFORNIA WILL
PRODUCE GUSTY NORTH TO NORTHWEST WINDS THIS AFTERNOON. RELATIVE
HUMIDITIES WILL BE A LITTLE HIGHER THAN THEY WERE TUESDAY...BUT
ELEVATIONS BELOW 6000 FEET IN SOUTHEAST CALIFORNIA AND EXTREME
SOUTHERN NEVADA WILL ONCE AGAIN SEE VALUES DROP BELOW 15 PERCENT.

CAZ226-228-NVZ465-211900-
/O.EXP.KVEF.FW.W.0023.000000T0000Z-080521T0900Z/
/O.CON.KVEF.FW.W.0024.080521T1900Z-080522T0300Z/
OWENS VALLEY/SOUTHERN INYO FOREST-MOJAVE DESERT-
CLARK AND SW LINCOLN COUNTY DESERTS/LAS VEGAS DISPATCH-
146 AM PDT WED MAY 21 2008

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM PDT
THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITIES...
...RED FLAG WARNING WILL EXPIRE AT 2 AM PDT EARLY THIS MORNING...

THE RED FLAG WARNING FOR WESTERN INYO COUNTY...MUCH OF SAN
BERNARDINO COUNTY...AND THE CLARK AND SOUTHWEST LINCOLN COUNTY
DESERTS WILL EXPIRE AT 2 AM PDT EARLY THIS MORNING. A RED FLAG
WARNING REMAINS IN EFFECT FOR THE SAME AREA FROM NOON TODAY TO 8
PM PDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITIES.

RELATIVE HUMIDITIES HAD RECOVERED ABOVE 15 PERCENT IN MOST AREAS
EARLY THIS MORNING. THEREFORE THE RED FLAG WARNING WILL BE ALLOWED
TO EXPIRE AT 2 AM.

A STRONG COLD FRONT WILL SWITCH THE WINDS TO THE NORTHWEST EARLY
THIS MORNING...WITH WIND GUSTS AROUND 40 MPH DURING THE DAY TODAY.
RELATIVE HUMIDITIES WILL BE A LITTLE HIGHER...BUT ELEVATIONS
BELOW 6000 FEET WILL ONCE AGAIN SEE RELATIVE HUMIDITIES FALL BELOW
15 PERCENT THROUGHOUT THE AFTERNOON AND INTO THE EARLY EVENING
HOURS.

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.

$$

AZZ102-NVZ460>464-211000-
/O.EXP.KVEF.FW.W.0023.000000T0000Z-080521T0900Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-
ESMERALDA AND NYE COUNTY DESERTS/CNC DISPATCH-
LINCOLN COUNTY/ELY DISPATCH-NYE COUNTY DESERTS/LAS VEGAS DISPATCH-
SHEEP RANGE-SPRING MOUNTAINS-
146 AM PDT WED MAY 21 2008 /146 AM MST WED MAY 21 2008/

...RED FLAG WARNING WILL EXPIRE AT 2 AM PDT /2 AM MST/ EARLY THIS
MORNING...

THE RED FLAG WARNING FOR ESMERALDA COUNTY...MUCH OF NYE...LINCOLN
AND MOHAVE COUNTIES...AND THE MOUNTAINS OF CLARK COUNTY WILL
EXPIRE AT 2 AM PDT /2 AM MST/ EARLY THIS MORNING.

RELATIVE HUMIDITIES HAD RECOVERED ABOVE 15 PERCENT IN MOST AREAS
EARLY THIS MORNING. THEREFORE THE RED FLAG WARNING WILL BE ALLOWED
TO EXPIRE AT 2 AM.

$$

CAZ227-211900-
/O.CON.KVEF.FW.W.0024.080521T1900Z-080522T0300Z/
DEATH VALLEY NATIONAL PARK-
146 AM PDT WED MAY 21 2008

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM PDT
THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITIES...

A RED FLAG WARNING REMAINS IN EFFECT FOR DEATH VALLEY NATIONAL
PARK FROM NOON TODAY TO 8 PM PDT THIS EVENING FOR GUSTY WINDS AND
LOW HUMIDITIES.

A STRONG COLD FRONT WILL SHIFT WINDS TO THE NORTHWEST EARLY THIS
MORNING...AND THESE WINDS WILL GUST THROUGHOUT THE DAY AT 40 TO
45 MPH. RELATIVE HUMIDITIES WILL BE A LITTLE HIGHER THAN THEY WERE
TUESDAY...BUT ELEVATIONS BELOW 6000 FEET WILL ONCE AGAIN SEE
RELATIVE HUMIDITIES FALL BELOW 15 PERCENT THROUGHOUT THE AFTERNOON
AND INTO THE EARLY EVENING HOURS.

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

000 
WWUS85 KVEF 211752
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1052 AM PDT WED MAY 21 2008

AZZ101-102-CAZ229-NVZ466-220300-
/O.EXA.KVEF.FW.W.0024.080521T1900Z-080522T0300Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-
NORTHWEST DESERTS/NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-
LAKE MEAD NRA/COLORADO RIVER-NV SIDE-
1052 AM PDT WED MAY 21 2008 /1052 AM MST WED MAY 21 2008/

...RED FLAG WARNING IN EFFECT UNTIL 8 PM PDT /8 PM MST/ THIS
EVENING...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A RED FLAG
WARNING FOR THE LAKE MEAD NATIONAL RECREATION AREA/LOWER COLORADO
RIVER VALLEY AND SOUTHERN MOHAVE COUNTY ARIZONA...WHICH IS IN EFFECT
UNTIL 8 PM THIS EVENING.

NORTHWEST WINDS GUSTING UP TO 40 MPH WILL IMPACT THE COLORADO
RIVER VALLEY AND SOUTHERN MOHAVE COUNTY ARIZONA THROUGH THE EARLY
EVENING. THESE GUSTY WINDS WILL COMBINE WITH RELATIVE HUMIDITY
VALUES BELOW 15 PERCENT AND PRODUCE CRITICAL FIRE WEATHER
CONDITIONS AND THE POTENTIAL FOR EXTREME FIRE GROWTH. WIND GUSTS ARE
EXPECTED TO GENERALLY DECREASE BELOW 25 MPH BY LATE EVENING.

$$

CAZ226>228-NVZ465-220300-
/O.CON.KVEF.FW.W.0024.080521T1900Z-080522T0300Z/
OWENS VALLEY/SOUTHERN INYO FOREST-DEATH VALLEY NATIONAL PARK-
MOJAVE DESERT-
CLARK AND SW LINCOLN COUNTY DESERTS/LAS VEGAS DISPATCH-
1052 AM PDT WED MAY 21 2008

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS
EVENING...

A RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING
FOR SOUTHEAST CALIFORNIA AND FAR SOUTHERN NEVADA.

NORTHWEST WINDS GUSTING BETWEEN 40 AND 50 MPH IMPACT SOUTHERN
NEVADA AND SOUTHEAST CALIFORNIA TROUGH THE EARLY EVENING. THESE
GUSTY WINDS WILL COMBINE WITH RELATIVE HUMIDITY VALUES BELOW 15
PERCENT AND PRODUCE CRITICAL FIRE WEATHER CONDITIONS AND THE
POTENTIAL FOR EXTREME FIRE GROWTH. WIND GUSTS ARE EXPECTED TO
GENERALLY DECREASE BELOW 25 MPH BY LATE EVENING.

$$

JGA

000 
WWUS85 KVEF 220240
RFWVEF

RED FLAG WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
740 PM PDT WED MAY 21 2008


AZZ101-102-CAZ226>229-NVZ465-466-220345-
/O.EXP.KVEF.FW.W.0024.000000T0000Z-080522T0300Z/
LAKE MEAD NRA/COLORADO RIVER-AZ SIDE-
NORTHWEST DESERTS/NORTHWEST PLATEAU-
OWENS VALLEY/SOUTHERN INYO FOREST-DEATH VALLEY NATIONAL PARK-
MOJAVE DESERT-LOWER COLORADO RIVER VALLEY-
CLARK AND SW LINCOLN COUNTY DESERTS/LAS VEGAS DISPATCH-
LAKE MEAD NRA/COLORADO RIVER-NV SIDE-
740 PM PDT WED MAY 21 2008 /740 PM MST WED MAY 21 2008/

...RED FLAG WARNING WILL EXPIRE AT 8 PM PDT /8 PM MST/ THIS
EVENING...

THE RED FLAG WARNING WILL EXPIRE AT 8 PM PDT /8 PM MST/ THIS
EVENING. 

WINDS WERE DECREASING THIS EVENING ACROSS SOUTHERN NEVADA AND
NORTHWEST ARIZONA AND HUMIDITY WAS STARTING TO RISE. WINDS WERE
STILL GUSTING AROUND 40 MPH ACROSS SOUTHEAST CALIFORNIA BUT
HUMIDITY WAS ALREADY ABOVE 15 PERCENT IN MOST AREAS AS OF 7 PM.
ALTHOUGH ISOLATED RED FLAG CONDITIONS MAY EXIST A LITTLE AFTER 8
PM...OVERALL CONDITIONS HAVE IMPROVED AND WILL CONTINUE TO IMPROVE
SO THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE.

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
1230 PM PDT TUE MAY 20 2008

.SYNOPSIS...A STRONG AREA OF HIGH PRESSURE WILL GIVE WAY TO A STRONG
PACIFIC LOW PRESSURE SYSTEM WHICH WILL REACH NORTHERN CALIFORNIA
THIS AFTERNOON. INCREASING SOUTHWEST WINDS WILL COMBINE WITH HOT
AND DRY WEATHER TO PRODUCE CRITICAL FIRE WEATHER CONDITIONS THIS
AFTERNOON AND EVENING. THE UPPER LOW IS THEN FORECAST TO PLUNGE INTO
SOUTHERN NEVADA AND SURROUNDING AREAS TOMORROW THROUGH THE END OF
THE WEEK...BRINGING A DRAMATIC COOLING TREND AND ISOLATED TO
SCATTERED SHOWERS AND THUNDERSTORMS.
&&

.UPDATE...SFC PRESSURE GRADIENTS CONTINUE TO STRENGTHEN BETWEEN LAX
AND LAS AND HAVE REACHED 11.6 MB. THIS GRADIENTS IS EXPECTED TO
CONTINUE TO INCREASE AND MUCH STRONGER FLOW...50 KTS...AT 850 MB IS
EXPECTED TO MOVE ACROSS SAN BERNARDINO COUNTY AND INTO CLARK COUNTY
LATER THIS AFTERNOON AND EVENING. I HAVE GONE AHEAD AND ISSUED A
WIND ADVISORY FOR PORTIONS OF SOUTHERN NEVADA...INCLUDING THE LAS
VEGAS VALLEY WHICH GOES INTO EFFECT AT 2 PM. THIS WINDS ARE EXPECTED
TO DIMINISH SOMEWHAT LATER THIS EVENING...BUT THEN INCREASE AGAIN
WITH THE PASSAGE OF THE COLD FRONT IN THE PRE DAWN HOURS. I HAVE
UPGRADED THE WATCH TO A WARNING IN CENTRAL NYE AND ESMERALDA
COUNTIES...AND DOWNGRADED THE WATCH TO AN ADVISORY IN LINCOLN
COUNTY.

.PREV DISCUSSION...VERY COMPLICATED WEATHER SITUATION IS UNFOLDING
PRETTY MUCH AS ADVERTISED. SATELLITE SHOWS POWERFUL UPPER LOW
OFFSHORE OF BRITISH COLUMBIA BEGINNING TO ELONGATE SOUTHWARD UNDER
THE INFLUENCE OF STRONG JET STREAK DIGGING ON ITS SOUTHWESTERN
FLANK. THIS IS THE BEGINNING OF A PROCESS THAT WILL DIG THE BASE OF
THE TROUGH ALL THE WAY DOWN INTO THE MOJAVE DESERT BY TOMORROW
AFTERNOON...WITH AN UNSEASONABLY STRONG CUTOFF LOW FORMING OVER THE
DESERT SOUTHWEST THEREAFTER. THE 00Z MODELS SHOW MINOR CHANGES TO
THE FORECAST POSITION AND TRACK OF THE LOW. MORE CHANGES SUCH AS
THESE WILL PROBABLY CONTINUE RIGHT UP UNTIL THE CUTOFF LOW
FORMS...AND DO NOT WANT TO GET HUNG UP ON UNCERTAIN DETAILS.
FOCUSING ON THE MAIN HAZARDS...EXCESSIVE HEAT WILL CONTINUE FOR ONE
MORE DAY TODAY. WINDS WILL BE A MAJOR CHALLENGE. NMM AND ARW MODELS
STILL SUGGEST A DOWNSLOPE WIND EVENT IN THE LEE OF THE SIERRA
TONIGHT. LOW HEIGHT OF CRITICAL LEVEL IN THE CROSS SECTION IS THE
MOST IMPRESSIVE FEATURE. UPGRADED HIGH WIND WATCH TO A WARNING FOR
THE EASTERN SIERRA SLOPES AND THE OWENS VALLEY...AND KEPT THE TIMING
INTACT. MODELS SHOW THE BEST SIGNATURE OVERNIGHT...BUT WE HAVE SEEN
SEVERAL EVENTS IN WHICH THE HIGH WINDS OCCURRED IN THE LATE
AFTERNOON DESPITE THE PEAK MODEL SIGNATURE OCCURRING OVERNIGHT.
FARTHER SOUTH...UPGRADED THE SAN BERNARDINO COUNTY HIGH WIND WATCH
TO A WIND ADVISORY. WINDS WILL PROBABLY START IN THE NORTHWEST PART
OF THE COUNTY THIS AFTERNOON AND SPREAD FARTHER SOUTH AND EAST
TONIGHT AND TOMORROW...BUT LEFT THE TIMING INTACT FOR THE WHOLE
COUNTY FOR THE SAKE OF BREVITY. EXPECT BORDERLINE WIND ADVISORY
CONDITIONS IN PARTS OF CLARK AND MOHAVE COUNTIES AS WELL LATE THIS
AFTERNOON...BUT EXTENT AND DURATION OF GUSTS WILL BE CLOSE. THE
INCREASING WINDS THIS AFTERNOON WILL ALSO LEAD TO CRITICAL FIRE
WEATHER CONDITIONS...AND THE RED FLAG WARNING REMAINS IN EFFECT. THE
SURFACE COLD FRONT WILL INVADE FROM THE NORTHWEST TONIGHT AND PASS
THROUGH ALL OF THE CWFA BY WEDNESDAY AFTERNOON...BRINGING A WIND
SHIFT AND THE POSSIBILITY OF STRONG NORTHERLY WINDS. NMM SHOWS 30-40
KNOT NORTHERLY WINDS IN PORTIONS OF ESMERALDA...NYE AND LINCOLN
COUNTIES BEGINNING TONIGHT AND CONTINUING THROUGH THE DAY TOMORROW.
THIS AREA FREQUENTLY SEEMS TO GET MUCH STRONGER WINDS THAN ONE WOULD
EXPECT...SO HOISTED A HIGH WIND WATCH FOR TONIGHT THROUGH WEDNESDAY
NIGHT. THESE WINDS WILL USHER IN MUCH COOLER AIR...WITH HIGH TEMPS
FALLING 20-30 DEGREES IN MOST AREAS FROM TUESDAY TO THURSDAY.
UNSTABLE AIR ASSOCIATED WITH THE COLD CORE UPPER LOW WILL ALSO LEAD
TO A CHANCE OF THUNDERSTORMS...ESPECIALLY OVER THE EASTERN ZONES.

.LONG TERM...FRIDAY TO MONDAY...STILL LOOKING FOR UPPER LOW OVER
SOUTHERN NEVADA / SOUTHERN CALIFORNIA AREA AT START OF PERIOD.
MODELS SO DIFFER IN EXACT PLACEMENT BUT NOT ENOUGH TO CHANGE THE
SENSIBLE WEATHER MUCH. AREA WILL SEE THE A DIURNAL PATTERN IN THE
PRECIPITATION ASSOCIATED WITH THE UPPER LOW...WITH THUNDERSTORM
ACTIVITY MOSTLY IN THE DAY DUE TO SURFACE HEATING AND LESS COVERAGE
AND SHOWERS AT NIGHT. DID INCREASE THE POPS FOR MOST OF THE AREA ON
FRIDAY NIGHT AND SATURDAY AS LOW MOVES EAST AND BRINGS IT COLD CORE
OVER THE AREA. STILL ANOTHER REINFORCING WAVE WILL MOVE SOUTH ON THE
BACKSIDE OF THE TROUGH SATURDAY AND THEN THIS ONE WILL MOVE EAST AS
WELL ON SUNDAY BUT ON A BIT FURTHER NORTH TRACK. THIS WILL BRING AN
INCREASE IN POPS FOR THE SIERRA ZONES THEN. THE WHOLE SYSTEM BEGINS
MOVING OUT ON MONDAY AND WE SHOULD BE PRETTY MUCH DRY BY NEXT
TUESDAY. TEMPERATURES WILL TAKE A GRADUAL UPWARD MOVE SATURDAY
ON...BUT WILL STAY BELOW NORMAL.
&&

.AVIATION...FOR MCCARRAN...SOUTHWEST WINDS 15 TO 25 MPH ARE EXPECTED
TO INCREASE THIS AFTERNOON INTO THE 20 TO 30 MPH RANGE WITH GUSTS
OVER 35 MPH. THERE MAY BE A LULL IN THE WIND SPEEDS BETWEEN 04Z AND
10Z...BUT ARE EXPECTED TO INCREASE FROM THE SOUTHWEST 20 TO 30 MPH
WITH GUSTS NEAR 40 MPH BETWEEN 10Z AND 14Z. A COLD FRONT WILL MOVE
THROUGH THE LAS VEGAS VALLEY AROUND 14Z WITH WINDS SHIFTING TO THE
NORTHWEST 20 TO 30 MPH AND OCCASIONAL GUSTS NEAR 40 MPH.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...THE RIDGE OVER THE AREA THAT HAS BROUGHT THE
UNSEASONABLY HOT TEMPERATURES WILL BEGIN TO BREAK DOWN AFTER TODAY
AS A PACIFIC STORM APPROACHES. SOUTHWEST TO WEST WINDS WINDS WILL BE
15 TO 25 KNOT RANGE WITH WESTERN SAN BERNARDINO COUNTY SEEING WINDS
IN THE 20 TO 30 MPH RANGE. STRONG DOWNSLOPE WINDS ARE POSSIBLE ON
THE EAST SLOPES OF THE SIERRA AND IN THE OWENS VALLEY LATE THIS
AFTERNOON AND INTO TONIGHT. WEDNESDAY MORNING WILL SEE A COLD FRONT
MOVE THROUGH THE AREA AND BRING A SHIFT IN WIND DIRECTION TO THE
NORTHWEST TO NORTH. THURSDAY THROUGH THE WEEKEND WILL SEE AFTERNOON
CONVECTION OVER THE AREA AS UNSTABLE AIR MOVES IN BEHIND THE FRONT.
&&

.FIRE WEATHER...A RED FLAG WARNING IS IN EFFECT FROM 1 PM UNTIL 9 PM
TODAY FOR MOST OF SOUTHERN NEVADA...NORTHWEST ARIZONA AND PARTS OF
SOUTHEAST CALIFORNIA. INCREASING SOUTHWEST WINDS...WITH GUSTS NEAR
40 MPH POSSIBLE...WILL DEVELOP THIS AFTERNOON ALONG WITH RECORD
BREAKING HIGH TEMPERATURES AND SINGLE DIGIT RELATIVE HUMIDITY
VALUES. IN ADDITION...CONDITIONS COULD BE FAVORABLE FOR STRONG
DOWNSLOPE WINDS...POTENTIALLY OVER 60 MPH...ALONG THE EAST SLOPES OF
THE SOUTHERN SIERRA LATE THIS AFTERNOON AND EVENING.
&&

.CLIMATE...RECORD BREAKING HIGH TEMPERATURES ARE EXPECTED ACROSS THE
MOJAVE DESERT AND SOUTHERN GREAT BASIN AGAIN TODAY. RECORD HIGH
MINIMUM TEMPERATURES ALSO LOOK POSSIBLE AT LAS VEGAS. RECORDS FOR
SEVERAL STATIONS IN OUR AREA...AS WELL AS SOME STATISTICS ON TRIPLE
DIGIT TEMPERATURES FOR LAS VEGAS ARE BELOW.

RECORD HIGHS...

LOCATION        TUESDAY
                5/20

LAS VEGAS       102/2005
BISHOP           96/1984
DAGGETT         103/1984
NEEDLES         109/2005

* INDICATES THE LAST TIME A RECORD HIGH WAS REACHED.

RECORD HIGH MINIMUMS FOR LAS VEGAS...
5/20...77/2006 AND PREVIOUS YEARS
5/21...76/2005

FOR LAS VEGAS...THE AVERAGE DATE OF THE FIRST TRIPLE DIGIT
TEMPERATURE IS MAY 25TH. THE EARLIEST TRIPLE DIGIT TEMPERATURE WAS
ON MAY 1 1947. THE LATEST OCCURRENCE OF THE FIRST 100 DEGREE OR
BETTER TEMPERATURE WAS JUNE 30 1965. THE ALL-TIME MONTHLY HIGH
TEMPERATURE FOR MAY IS 109 DEGREES. THAT HAS OCCURRED ON MAY 26 1951
AND MAY 28 2003.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...RED FLAG WARNING UNTIL 9 PM PDT THIS EVENING FOR NVZ460>465.
     WIND ADVISORY UNTIL 5 PM PDT WEDNESDAY FOR NVZ016>020-022.
     EXCESSIVE HEAT WARNING UNTIL 7 PM PDT THIS EVENING FOR NVZ016-
     017-020>022.
     WIND ADVISORY FROM 1 AM TO 5 PM PDT WEDNESDAY FOR NVZ015.
     HIGH WIND WARNING FROM 10 PM THIS EVENING TO 10 PM PDT WEDNESDAY
     FOR NVZ014.
AZ...RED FLAG WARNING UNTIL 9 PM MST THIS EVENING FOR AZZ102.
     EXCESSIVE HEAT WARNING UNTIL 7 PM MST THIS EVENING FOR AZZ002-
     003-036.
     WIND ADVISORY FROM 1 AM TO 5 PM MST WEDNESDAY FOR AZZ001.
CA...RED FLAG WARNING UNTIL 9 PM PDT THIS EVENING FOR CAZ226-228.
     HIGH WIND WARNING UNTIL 6 AM PDT WEDNESDAY FOR CAZ519-520.
     EXCESSIVE HEAT WARNING UNTIL 7 PM PDT THIS EVENING FOR
     CAZ522>527.
     WIND ADVISORY UNTIL 9 PM PDT WEDNESDAY FOR CAZ523>526.
     WIND ADVISORY FROM 1 AM TO 5 PM PDT WEDNESDAY FOR CAZ521-522.
&&

CZYZYK/GORELOW/MORGAN/JACQUES

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
609 AM PDT TUE MAY 20 2008

CAZ523>526-210700-
WESTERN MOJAVE DESERT-EASTERN MOJAVE DESERT-MORONGO BASIN-
CADIZ BASIN-
609 AM PDT TUE MAY 20 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

HOT AND DRY CONDITIONS WILL CONTINUE THROUGH TODAY...AND WEST
WINDS WILL INCREASE THIS AFTERNOON. AN EXCESSIVE HEAT WARNING AND
A RED FLAG WARNING ARE IN EFFECT FOR THE AFTERNOON AND
EVENING...AND A WIND ADVISORY GOES INTO EFFECT LATE THIS
AFTERNOON. FOR MORE DETAILS...PLEASE REFER TO PRODUCTS RNONPWVEF
AND RNORFWVEF.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A STRONG COLD FRONT WILL MOVE THROUGH ON WEDNESDAY...AND THE WIND
ADVISORY REMAINS IN EFFECT UNTIL WEDNESDAY EVENING. FOR THURSDAY
THROUGH MONDAY...AN UNSEASONABLY STRONG UPPER LEVEL LOW WILL SPIN
OVER THE AREA...BRINGING MUCH COOLER TEMPERATURES AND A CHANCE OF
SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED...HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURE.

AZZ003-NVZ016-017-020-022-210700-
NORTHWEST DESERTS-NORTHEAST CLARK COUNTY-
WESTERN CLARK AND SOUTHERN NYE COUNTY-LAS VEGAS VALLEY-
SOUTHERN CLARK COUNTY-
609 AM PDT TUE MAY 20 2008 /609 AM MST TUE MAY 20 2008/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
ARIZONA AND SOUTHERN NEVADA.

.DAY ONE...TODAY AND TONIGHT

HOT AND DRY CONDITIONS WILL CONTINUE THROUGH TODAY...AND SOUTHWEST
WINDS WILL INCREASE THIS AFTERNOON. AN EXCESSIVE HEAT WARNING AND
A RED FLAG WARNING ARE IN EFFECT FOR THE AFTERNOON AND EVENING.
FOR MORE DETAILS...PLEASE REFER TO PRODUCTS RNONPWVEF AND
RNORFWVEF.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A STRONG COLD FRONT WILL MOVE THROUGH ON WEDNESDAY...BRINGING
GUSTY NORTH WINDS. FOR THURSDAY THROUGH MONDAY...AN UNSEASONABLY
STRONG UPPER LEVEL LOW WILL SPIN OVER THE AREA...BRINGING MUCH
COOLER TEMPERATURES AND A CHANCE OF SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED...HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURE.

AZZ001-NVZ018-019-210700-
NORTHWEST PLATEAU-SHEEP RANGE-SPRING MOUNTAINS-
609 AM PDT TUE MAY 20 2008 /609 AM MST TUE MAY 20 2008/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
ARIZONA AND SOUTHERN NEVADA.

.DAY ONE...TODAY AND TONIGHT

WARM AND DRY CONDITIONS WILL CONTINUE THROUGH TODAY...AND
SOUTHWEST WINDS WILL INCREASE THIS AFTERNOON. A RED FLAG WARNING
IS IN EFFECT FOR THE AFTERNOON AND EVENING. FOR MORE
DETAILS...PLEASE REFER TO PRODUCT RNORFWVEF.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A STRONG COLD FRONT WILL MOVE THROUGH ON WEDNESDAY...BRINGING
GUSTY NORTH WINDS. FOR THURSDAY THROUGH MONDAY...AN UNSEASONABLY
STRONG UPPER LEVEL LOW WILL SPIN OVER THE AREA...BRINGING MUCH
COOLER TEMPERATURES AND A CHANCE OF SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED...HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURE.

AZZ002-036-CAZ522-527-NVZ021-210700-
LOWER COLORADO RIVER VALLEY-LAKE MEAD NATIONAL RECREATION AREA-
DEATH VALLEY NATIONAL PARK-SAN BERNARDINO COUNTY-
UPPER COLORADO RIVER VALLEY-
609 AM PDT TUE MAY 20 2008 /609 AM MST TUE MAY 20 2008/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
ARIZONA...CALIFORNIA AND SOUTHERN NEVADA.

.DAY ONE...TODAY AND TONIGHT

HOT AND DRY CONDITIONS WILL CONTINUE THROUGH TODAY. AN EXCESSIVE
HEAT WARNING IS IN EFFECT FOR THE AFTERNOON AND EVENING. FOR MORE
DETAILS...PLEASE REFER TO PRODUCT RNONPWVEF.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A STRONG COLD FRONT WILL MOVE THROUGH ON WEDNESDAY...BRINGING
GUSTY NORTH WINDS. FOR THURSDAY THROUGH MONDAY...AN UNSEASONABLY
STRONG UPPER LEVEL LOW WILL SPIN OVER THE AREA...BRINGING MUCH
COOLER TEMPERATURES AND A CHANCE OF SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED...HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURE.

CAZ519-520-210700-
EASTERN SIERRA SLOPES-OWENS VALLEY-
609 AM PDT TUE MAY 20 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

A DOWNSLOPE WIND EVENT IS EXPECTED TO DEVELOP ON THE EASTERN
SLOPES OF THE SIERRA AND INTO THE OWENS VALLEY THIS EVENING. A
HIGH WIND WARNING IS IN EFFECT FROM LATE THIS AFTERNOON THROUGH
TONIGHT. FOR MORE DETAILS...PLEASE REFER TO PRODUCT RNONPWVEF.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A STRONG COLD FRONT WILL MOVE THROUGH ON WEDNESDAY...BRINGING
GUSTY NORTH WINDS. FOR THURSDAY THROUGH MONDAY...AN UNSEASONABLY
STRONG UPPER LEVEL LOW WILL SPIN OVER THE AREA...BRINGING MUCH
COOLER TEMPERATURES AND A CHANCE OF SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED...HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURE.

NVZ014-015-210700-
ESMERALDA AND CENTRAL NYE COUNTY-LINCOLN COUNTY-
609 AM PDT TUE MAY 20 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHERN
NEVADA.

.DAY ONE...TODAY AND TONIGHT

WARM AND DRY CONDITIONS WILL CONTINUE TODAY...AND WEST TO
SOUTHWEST WINDS WILL INCREASE. A RED FLAG WARNING IS IN EFFECT FOR
THE AFTERNOON AND EVENING. A STRONG COLD FRONT WILL MOVE THROUGH
TONIGHT...BRINGING STRONG NORTH WINDS. A HIGH WIND WATCH IS IN
EFFECT FOR TONIGHT. FOR MORE DETAILS...PLEASE REFER TO PRODUCTS
RNORFWVEF AND RNONPWVEF.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

STRONG NORTH WINDS WILL CONTINUE ON WEDNESDAY...AND THE HIGH WIND
WATCH REMAINS IN EFFECT UNTIL WEDNESDAY EVENING. FOR THURSDAY
THROUGH MONDAY...AN UNSEASONABLY STRONG UPPER LEVEL LOW WILL SPIN
OVER THE AREA...BRINGING MUCH COOLER TEMPERATURES AND A CHANCE OF
SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED...HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURE.

CAZ521-210700-
WHITE MOUNTAINS OF INYO COUNTY-
609 AM PDT TUE MAY 20 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

WARM AND DRY CONDITIONS WILL CONTINUE TODAY...AND WEST TO
SOUTHWEST WINDS WILL INCREASE THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A STRONG COLD FRONT WILL MOVE THROUGH ON WEDNESDAY...BRINGING
GUSTY NORTH WINDS. FOR THURSDAY THROUGH MONDAY...AN UNSEASONABLY
STRONG UPPER LEVEL LOW WILL SPIN OVER THE AREA...BRINGING MUCH
COOLER TEMPERATURES AND A CHANCE OF SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED...HOWEVER SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURE.

MORGAN