Red Flag Warning 10, NWS Las Vegas, NV

000 
WWUS85 KVEF 082249
RFWVEF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE LAS VEGAS NV
349 PM PDT WED JUL 8 2009

AZZ102-090000-
/O.CAN.KVEF.FW.W.0010.000000T0000Z-090709T0400Z/
NORTHWEST DESERTS/NORTHWEST PLATEAU-
349 PM MST WED JUL 8 2009

...RED FLAG WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS CANCELLED THE RED
FLAG WARNING FOR THE NORTHWEST DESERTS AND NORTHWEST PLATEAU.

ALTHOUGH THERE ARE WIDESPREAD RELATIVE HUMIDITY VALUES BELOW 15
PERCENT ACROSS MOHAVE COUNTY...WIDESPREAD WIND GUSTS OVER 35 MPH
HAVE NOT MATERIALIZED AND ARE NO LONGER EXPECTED.

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
858 PM PDT TUE JUL 7 2009

.SYNOPSIS...A DRY WEST TO SOUTHWEST FLOW WILL CONTINUE ACROSS THE
AREA ON WEDNESDAY WITH LOCALLY BREEZY CONDITIONS EXPECTED ONCE
AGAIN IN THE AFTERNOON AND EVENING HOURS. THE FLOW ALOFT WILL TURN
MORE SOUTHERLY FOR THURSDAY AND FRIDAY RESULTING IN AN INCREASE IN
MOISTURE MAINLY ACROSS THE MOJAVE DESERT WITH THE POSSIBILITY OF
AN ISOLATED THUNDERSTORM OVER MOHAVE COUNTY IN THE AFTERNOON HOURS
EACH DAY. DRY CONDITIONS ALONG WITH A SLIGHT WARMING TREND ARE
THEN EXPECTED FOR THE WEEKEND.
&&

.UPDATE...SOUTHWEST WINDS HAVE BEGUN DECREASING ACROSS THE SOUTHERN
GREAT BASIN AND MOJAVE DESERT. WILL LET RED FLAG WARNING EXPIRE AT
11 PM THIS EVENING. HOWEVER WILL UPDATE PUBLIC ZONE AND REMOVE ANY
MENTION OF EVENING. 00Z NAM DOES NOT SUPPORT THE MENTION OF
THUNDERSTORMS IN NORTHWEST ARIZONA THURSDAY OR FRIDAY. THE IMPENDING
MOISTURE INCREASE IS IN THE MID AND UPPER LEVELS WHILE DEEPER
MOISTURE ASSOCIATED WITH THE MONSOON MOISTURE BOUNDARY REMAINS OVER
EASTERN ARIZONA. WILL AWAIT THE ARRIVAL OF THE 00Z GFS BEFORE MAKING
ANY CHANGES TO LATTER PERIODS.
&&

.PREV DISCUSSION...358 PM PDT TUE JUL 7...A SERIES OF DISTURBANCES
CONTINUES TO ROTATE AROUND A BROAD UPPER LOW ACROSS THE PAC NW. THE
COMBINATION OF THE PASSAGE OF THESE DISTURBANCES ACROSS NORTHERN
CALIFORNIA...THE HEATING OF THE DAY AND INCREASING DAYTIME SURFACE
PRESSURE GRADIENTS HAS RESULTED IN LOCALLY BREEZY CONDITIONS OUT OF
THE SOUTHWEST THIS AFTERNOON. THESE WINDS WILL CONTINUE INTO THIS
EVENING BEFORE DECREASING LATER TONIGHT AND REDEVELOPING ONCE AGAIN
ON WEDNESDAY AFTERNOON. LITTLE SIGNIFICANT CHANGE IS EXPECTED IN
TEMPERATURES FOR TOMORROW.

BY THURSDAY THE UPPER LEVEL PATTERN CHANGES VERY LITTLE WITH THE
BROAD UPPER LOW NOW OFF THE OREGON COAST. SURFACE PRESSURE
GRADIENTS ARE WEAKER AND THIS SHOULD CUT BACK ON THE STRENGTH OF
THE AFTERNOON AND EVENING WINDS SOME. HOWEVER...THE FLOW ALOFT DOES
BECOME MORE SOUTHERLY AND THIS MAY HELP TO BRING UP AN INCREASE IN
MOISTURE ACROSS THE MOJAVE DESERT ESPECIALLY IN MOHAVE COUNTY.
MORE THAN LIKELY THIS WILL JUST RESULT IN AN INCREASE IN AFTERNOON
CUMULUS ACROSS MOHAVE COUNTY AS LIFTED INDICES ARE GENERALLY AT OR
ABOVE +2 BUT AN ISOLATED AFTERNOON THUNDERSTORM CANNOT ENTIRELY BE
RULED OUT HERE SO HAVE INTRODUCED SOME SLIGHT CHANCE POPS.

THE FLOW ALOFT TURNS MORE SOUTHERLY THURSDAY NIGHT INTO FRIDAY AND
ONCE AGAIN WE MAY GET AN ISOLATED THUNDERSTORM OVER MOHAVE COUNTY.
HOWEVER AS THE UPPER RIDGE CENTERED OVER NEW MEXICO
STRENGTHENS...HEIGHTS RISE AND THIS SHOULD HELP US TO WARM UP A
FEW DEGREES UNLESS WE REALLY MOISTEN UP MORE THAN CURRENTLY
EXPECTED.

.LONG TERM...THIS EXTENDED FORECAST PACKAGE MAINTAINS THE IDEA THAT
HIGH PRESSURE WILL REMAIN IN CONTROL OF THE AREA WEATHER OVER THE
WEEKEND AND INTO EARLY NEXT WEEK. DRY CONDITIONS ARE FORECAST TO
CONTINUE WITH TEMPERATURES SEVERAL DEGREES ABOVE NORMAL. HOWEVER...
THE DRY CONDITIONS ARE SUBJECT TO CHANGE IF THE HIGH CENTER WERE TO
TAKE UP A MORE FAVORABLE POSITION AND/OR MOISTURE FROM CONVECTION
OVER ARIZONA AND NORTHERN MEXICO WERE TO PROPAGATE INTO THE AREA
VIA SOME CURRENTLY UNRESOLVED TRANSPORT FEATURE SUCH AS AN INVERTED
TROUGH OR TROPICAL SYSTEM.
&&

.AVIATION...FOR MCCARRAN...VERY LITTLE CHANGE IS EXPECTED OVER THE
NEXT SEVERAL DAYS AS THE CURRENT WEATHER PATTERN IS CONDUCIVE TO
GUSTY SOUTHWEST WINDS...CLEAR SKIES AND DRY CONDITIONS.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...MOSTLY CLEAR SKIES WITH A FEW CLOUDS OVER THE AREA.
BREEZY SOUTHWEST WINDS ARE EXPECTED DURING THE AFTERNOON HOURS OVER
THE NEXT FEW DAYS. OTHERWISE...NO SIGNIFICANT WEATHER IS EXPECTED.
&&

.FIRE WEATHER...SO FAR WIDESPREAD RELATIVE HUMIDITY VALUES AT OR
BELOW 15 PERCENT HAVE BEEN OBSERVED THIS AFTERNOON...HOWEVER MOST
WIND GUSTS HAVE REMAINED BELOW 35 MPH. THE RED FLAG WARNING WILL
REMAIN IN EFFECT AS WINDS MAY STILL COME UP OVER MORE OF THE AREA
THIS EVENING. FOR WEDNESDAY...RELATIVE HUMIDITY VALUES LOOK TO ONCE
AGAIN DROP TO OR BELOW 15 PERCENT ACROSS SOUTHERN NEVADA. WINDS
WILL ONCE AGAIN FLIRT WITH THE 35 MPH THRESHOLD ACROSS MOST AREAS
AND THUS HAVE ISSUED A FIRE WEATHER WATCH AS WHILE THE POTENTIAL
IS THERE FOR WINDS TO REACH CRITICAL LEVELS...THERE IS ALSO SOME
CHANCE FOR THE DURATION TO FALL SHORT OF THE 3 HOUR CRITERIA.
NV ZONE 460 WAS LEFT OUT AS SURFACE PRESSURE GRADIENTS ARE LIGHTER
THERE TOMORROW AND THIS WILL RESULT IN WEAKER WINDS. IN NORTHWEST
ARIZONA MOISTURE IS EXPECTED TO INCREASE OVERNIGHT ACROSS SOUTHERN
MOHAVE COUNTY BUT IT LOOKS LIKE AREAS ABOVE 5000 FEET IN THE
NORTHERN PART OF MOHAVE COUNTY COULD STILL SEE RELATIVE HUMIDITY
VALUES DROP TO OR BELOW 15 PERCENT FOR 3 OR MORE HOURS ON
WEDNESDAY AFTERNOON SO HAVE ISSUED A FIRE WEATHER WATCH FOR THIS
AREA.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...RED FLAG WARNING UNTIL 11 PM PDT THIS EVENING FOR NVZ460>465.
     FIRE WEATHER WATCH FROM WEDNESDAY MORNING THROUGH WEDNESDAY
     EVENING FOR NVZ461>465.
AZ...RED FLAG WARNING UNTIL 11 PM MST THIS EVENING FOR AZZ102.
     FIRE WEATHER WATCH FROM WEDNESDAY MORNING THROUGH WEDNESDAY
     EVENING FOR AZZ102.
CA...NONE.
&&

PIERCE/STACHELSKI/SALMEN

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
323 PM PDT TUE JUL 7 2009

AZZ001-003-NVZ014>020-022-081330-
NORTHWEST PLATEAU-NORTHWEST DESERTS-
ESMERALDA AND CENTRAL NYE COUNTY-LINCOLN COUNTY-
NORTHEAST CLARK COUNTY-WESTERN CLARK AND SOUTHERN NYE COUNTY-
SHEEP RANGE-SPRING MOUNTAINS-LAS VEGAS VALLEY-
SOUTHERN CLARK COUNTY-
323 PM PDT TUE JUL 7 2009 /323 PM MST TUE JUL 7 2009/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

A RED FLAG WARNING REMAINS IN EFFECT FOR THIS AFTERNOON AND
EVENING FOR SOUTHERN NEVADA AND THE NORTHWEST PLATEAU AND
NORTHWEST DESERTS OF ARIZONA. VERY HIGH FIRE DANGER COMBINED WITH
WIDESPREAD WIND GUSTS BETWEEN 35 AND 40 MPH AND RELATIVE HUMIDITY
AT OR BELOW 15 PERCENT WILL CREATE EXTREME FIRE GROWTH POTENTIAL.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A FIRE WEATHER WATCH HAS BEEN ISSUED FROM WEDNESDAY MORNING
THROUGH WEDNESDAY EVENING FOR MUCH OF SOUTHERN NEVADA AND FOR
ELEVATIONS AT OR ABOVE 5000 FEET IN NORTHWEST ARIZONA. THE
POTENTIAL EXISTS FOR SEVERAL HOURS OF RELATIVE HUMIDITY VALUES AT
OR BELOW 15 PERCENT AS WELL AS WIND GUSTS OF 35 TO 40 MPH.

OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME DURING
THIS PERIOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER,
SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

AZZ002-036-CAZ519>527-NVZ021-081330-
LOWER COLORADO RIVER VALLEY-LAKE MEAD NATIONAL RECREATION AREA-
EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
DEATH VALLEY NATIONAL PARK-WESTERN MOJAVE DESERT-
EASTERN MOJAVE DESERT-MORONGO BASIN-CADIZ BASIN-
SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-
323 PM PDT TUE JUL 7 2009 /323 PM MST TUE JUL 7 2009/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER,
SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

STACHELSKI