High Wind Watch 14, NWS Las Vegas, NV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
341 AM PDT SAT OCT 20 2007

.SYNOPSIS...A STRONG AREA OF LOW PRESSURE WILL PASS OVER NORTHERN
NEVADA TODAY...BRINGING ANOTHER ROUND OF STRONG WINDS AND COOLER
TEMPERATURES TO THE AREA SUNDAY. AN UNSEASONABLY STRONG RIDGE OF
HIGH PRESSURE IS EXPECTED TO BUILD OVER THE REGION NEXT
WEEK...RESULTING IN DRY WEATHER AND A WARMING TREND. VALLEY
LOCATIONS WILL SEE LESS WARMING THAN THE MOUNTAINS DUE TO COLD AIR
BEING TRAPPED IN THE VALLEYS.
&&

.SHORT TERM...STRONG TROUGH OF LOW PRESSURE WILL SLIDE ACROSS THE
GREAT BASIN TODAY AND TONIGHT USHERING IN ANOTHER ROUND OF STRONG
WINDS. STRONG WINDS ALREADY OCCURRING IN SIERRA AND JUST IN THE PAST
2-3 HOURS OBSERVATION SITES IN THE LEE OF THE SIERRA REPORTING
HIGHER GUSTS NEAR CANYON OPENINGS. COLD FRONT ASSOCIATED WITH TROUGH
WILL ENTER NORTHWEST ZONES BY LATE MORNING AND STEADILY MOVE
SOUTHEAST THROUGH SOUTHERN NEVADA THIS EVENING AND CLEAR NORTHWEST
ARIZONA EARLY SUNDAY MORNING. CONTINUES TO LOOK LIKE STRONGEST WINDS
IN SOUTHERN NEVADA AND THE COLORADO RIVER WILL OCCUR JUST BEHIND THE
COLD FRONT THIS EVENING AND SUNDAY. WHILE STRONGER WEST WINDS AHEAD
OF THE FRONT WILL BE ACROSS SAN BERNARDINO AND MOHAVE COUNTIES
TODAY. TROUGH DIGS INTO THE SOUTHERN ROCKIES SUNDAY WITH TIGHT
NORTH-SOUTH SURFACE PRESSURE GRADIENT REMAINING OVER THE AREA.
PATTERN STAYS CONDUCIVE FOR STRONG WINDS DOWN THE COLORADO RIVER AND
HAVE DECIDED TO ISSUE A HIGH WIND WATCH AS NORTH WINDS GET FUNNELED
THROUGH THE NARROW CHANNELS. IT WILL REMAIN BREEZY ELSEWHERE.
DRAMATIC TEMPERATURE DROP WILL OCCUR SUNDAY AS READINGS WILL BE
RUNNING 10-15 DEGREES BELOW NORMAL. NORTH WINDS DOWN THE RIVER WILL
BEGIN TO RELAX MONDAY AS GRADIENT STARTS TO WEAKEN.

.LONG TERM...VERY LITTLE CHANGES MADE TO THE EXTENDED FORECAST AS
STRONG HIGH PRESSURE SETS UP OVER THE AREA. STILL LOOKING AT A
LINGERING SURFACE PRESSURE GRADIENT OVER THE COLORADO RIVER ZONES
MONDAY WHICH WILL LEAD TO A LITTLE WIND DOWN THE RIVER. THE GFS
KEEPS AT LEAST SOME NORTH/SOUTH GRADIENT THROUGH WEDNESDAY SO THE
POTENTIAL FOR AT LEAST A LITTLE WIND DOWN THE RIVER WILL EXIST FOR A
FEW DAYS. ELSEWHERE...LIGHT WINDS EXPECTED WHICH WILL PROVIDE VERY
LITTLE MIXING AND KEEP VALLEY TEMPERATURES ON THE COOL SIDE. STILL
RATHER LARGE SPREADS IN THE ENSEMBLE NUMBERS...BUT DID NOT MAKE ANY
ADJUSTMENTS TO TEMPERATURES THROUGH THE EXTENDED AS EVERYTHING IS
HANDLED WELL. MODELS BEGIN TO FLATTEN THE RIDGE FRIDAY AS A WEAK
UPPER LOW MOVES DOWN THE PACIFIC NORTHWEST COAST. BOTH THE ECMWF AND
GFS ARE TRENDING TOWARD EACH OTHER AND EVENTUALLY CUT THE LOW OFF
AND RETROGRADE IT OFFSHORE. FOR NOW...SLIGHTLY ABOVE NORMAL
TEMPERATURES AND DRY CONDITIONS EXPECTED THROUGH THE EXTENDED.
&&

.AVIATION...FOR MCCARRAN...SOUTHWEST WINDS WILL BEGIN TO INCREASE
TODAY AS A STRONG SYSTEM APPROACHES FROM THE WEST. BY THE LATE
AFTERNOON WIND GUSTS ARE EXPECTED TO TOP 35 KNOTS. A COLD FRONT WILL
MOVE THROUGH NEVADA THIS AFTERNOON AND IS FORECAST TO MOVE THROUGH
THE LAS VEGAS VALLEY AROUND 03Z THIS EVENING...PLUS OR MINUS TWO
HOURS. WINDS WILL QUICKLY SHIFT TO THE NORTH TO NORTHWEST WITH GUSTS
TO NEAR 35 KNOTS JUST BEHIND THE FRONT AND GRADUALLY DECREASE INTO
THE 20-25 KNOT RANGE WHICH WILL CONTINUE THROUGH THE REMAINDER OF
SATURDAY NIGHT AND SUNDAY.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...A PACIFIC STORM WILL INCREASE WINDS OUT OF THE
SOUTHWEST TODAY...PARTICULARLY ACROSS SAN BERNARDINO...SOUTHERN
CLARK...AND MOHAVE COUNTIES...WHERE GUSTS WILL INCREASE TO 35 TO 40
KNOTS LATE THIS MORNING AND AFTERNOON. ADDITIONALLY...STRONG WINDS
ALOFT WILL RESULT IN POSSIBLE DOWNSLOPE WINDS INTO THE OWENS VALLEY
UNTIL 15Z TODAY...AS WELL AS MOUNTAIN WAVE TURBULENCE LEE OF THE
SIERRA ALL DAY LONG. STRONG WINDS WILL BE POSSIBLE DOWN THE COLORADO
RIVER SUNDAY BEHIND THE FRONT WHERE WINDS MAY EXCEED 25-35 KNOTS.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...WIND ADVISORY FROM 6 PM THIS EVENING TO 6 AM PDT SUNDAY FOR
     NVZ015>022.
     FIRE WEATHER WATCH FROM SUNDAY MORNING THROUGH SUNDAY EVENING
     FOR NVZ466.
     HIGH WIND WATCH FROM SUNDAY MORNING THROUGH SUNDAY EVENING FOR
     NVZ021.
     WIND ADVISORY FROM 11 AM THIS MORNING TO MIDNIGHT PDT TONIGHT
     FOR NVZ014.
AZ...WIND ADVISORY FROM 6 PM THIS EVENING TO 6 AM MST SUNDAY FOR
     AZZ036.
     FIRE WEATHER WATCH FROM SUNDAY MORNING THROUGH SUNDAY EVENING
     FOR AZZ101.
     HIGH WIND WATCH FROM SUNDAY MORNING THROUGH SUNDAY EVENING FOR
     AZZ002-036.
     WIND ADVISORY FROM 9 AM THIS MORNING TO 9 PM MST THIS EVENING
     FOR AZZ001-003.
CA...HIGH WIND WARNING UNTIL 10 AM PDT THIS MORNING FOR CAZ519.
     FIRE WEATHER WATCH FROM SUNDAY MORNING THROUGH SUNDAY EVENING
     FOR CAZ229.
     HIGH WIND WATCH FROM SUNDAY MORNING THROUGH SUNDAY EVENING FOR
     CAZ527.
     WIND ADVISORY FROM 9 AM THIS MORNING TO 9 PM PDT THIS EVENING
     FOR CAZ523-524.
     WIND ADVISORY UNTIL MIDNIGHT PDT TONIGHT FOR CAZ520-521.
     WIND ADVISORY FROM 11 AM THIS MORNING TO MIDNIGHT PDT TONIGHT
     FOR CAZ522.
&&

PIERCE/GORELOW

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK...CORRECTED THIRD SECTION
NATIONAL WEATHER SERVICE LAS VEGAS NV
507 AM PDT FRI OCT 19 2007

CAZ519-200700-
EASTERN SIERRA SLOPES-
507 AM PDT FRI OCT 19 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

A HIGH WIND WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SATURDAY MORNING FOR THE EAST SLOPE OF THE SOUTHERN SIERRA ABOVE
5000 FEET. WEST WIND GUST OF 60 TO 70 MPH ARE POSSIBLE LATE
TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A STRONG COLD FRONT WILL SWEEP ACROSS THE SOUTHERN SIERRA LATE
SATURDAY MORNING. WINDS WILL SHIFT TO THE NORTHWEST AND DECREASE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

CAZ523-200700-
WESTERN MOJAVE DESERT-
507 AM PDT FRI OCT 19 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

THE THREAT FOR HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A HIGH WIND WATCH FOR WESTERN SAN BERNARDINO COUNTY IS IN EFFECT
FROM SATURDAY MORNING THROUGH SATURDAY EVENING. STRONG WEST WINDS
WILL OCCUR ACROSS THE WESTERN MOJAVE DESERT SATURDAY AS A STRONG
PACIFIC COLD FRONT MOVES ACROSS THE GREAT BASIN. WEST WIND GUSTS
TO AROUND 60 MPH WILL BE POSSIBLE SATURDAY AFTERNOON AND EVENING
ACROSS WESTERN SAN BERNARDINO COUNTY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

AZZ001>003-036-CAZ520>522-524>527-NVZ014>022-200700-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-OWENS VALLEY-
WHITE MOUNTAINS OF INYO COUNTY-DEATH VALLEY NATIONAL PARK-
EASTERN MOJAVE DESERT-MORONGO BASIN-CADIZ BASIN-
SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-
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-
507 AM PDT FRI OCT 19 2007 /507 AM MST FRI OCT 19 2007/

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

.DAY ONE...TODAY AND TONIGHT

THE THREAT FOR HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A STRONG COLD FRONT WILL SWEEP THROUGH CENTRAL NEVADA SATURDAY
AFTERNOON. THE COLD FRONT WILL RACE THROUGH THE REMAINDER OF SOUTHERN
NEVADA...NORTHWEST ARIZONA AND EASTERN CALIFORNIA SATURDAY NIGHT.
A WIND ADVISORY COULD BE NEEDED FOR SOUTHERN NEVADA SATURDAY
AFTERNOON AND SATURDAY NIGHT AS NORTHWEST WIND GUSTS EXCEEDING 40
MPH OCCUR JUST BEHIND THE COLD FRONT. A WIND ADVISORY MAY VERY
WELL BE NEEDED THROUGH SUNDAY FOR THE COLORADO RIVER AS STRONG
NORTH WINDS CONTINUE DOWN THE VALLEY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.