Dust Storm Warning 1, NWS Las Vegas, NV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
934 AM PDT THU APR 12 2007

.SYNOPSIS...A PACIFIC STORM SYSTEM WILL MOVE ACROSS SOUTHERN
NEVADA AND INTO NORTHWEST ARIZONA TODAY RESULTING IN GUSTY
WINDS...SCATTERED SHOWERS AND MUCH COOLER TEMPERATURES. HIGH
PRESSURE WILL MOVE OVER THE AREA ON FRIDAY FOR DRY AND WARMER
CONDITIONS.
&&

.UPDATE...MULTIPLE MESONET STATIONS IN WESTERN SAN BERNARDINO COUNTY
HAVE BEEN MEETING HIGH WIND WARNING CRITERIA THIS MORNING. UPDATED
TO UPGRADE WIND ADVISORY TO HIGH WIND WARNING FOR CAZ523 AND LEFT
REMAINDER OF ADVISORY INTACT. NO OTHER CHANGES AT THIS TIME.

.AVIATION...FOR KLAS: SOUTHWEST WINDS GENERALLY UNDER 10 KTS WILL
BECOME NORTHWEST AROUND 10 KTS LATER THIS MORNING. WINDS WILL
INCREASE AND BECOME GUSTY THIS AFTERNOON WITH WIND SPEEDS AROUND 20
KTS AND GUSTS TO AROUND 30 KTS. ISOLATED THUNDERSTORMS WILL ALSO BE
POSSIBLE IN AND AROUND THE LAS VEGAS VALLEY THIS AFTERNOON AS WELL
AS WITHIN THE MORMON MESA AND PEACH SPRINGS CORRIDORS.

REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA: STRONG WESTERLY SURFACE WINDS ARE EXPECTED TO CONTINUE
OVER THE WESTERN REGIONS OF SAN BERNARDINO COUNTY THIS MORNING
BEFORE BECOMING NORTHWEST THIS AFTERNOON. SUSTAINED WIND SPEEDS
AROUND 30 KTS WITH GUSTS TO 55 KTS ARE EXPECTED WITH REDUCTION IN
VISIBILITY DUE TO BLOWING DUST AND SAND POSSIBLE. ELSEWHERE...
WIDESPREAD NORTHWEST WINDS BETWEEN 20 AND 30 KTS WITH GUSTS TO 40
KTS EXPECTED THIS AFTERNOON. LIGHT SHOWERS AND ISOLATED TSTORMS WILL
ALSO BE A POSSIBILITY THIS AFTERNOON OVER THE NORTHERN/CENTRAL AND
EASTERN FORECAST AREA.
&&

.PREV DISCUSSION...
540 AM PDT THU APR 12 2007

.SHORT TERM...UPPER LOW MOVING INTO NORTHWEST NEVADA EARLY THIS
MORNING WITH CLOUDS AND SHOWERS DEVELOPING. THIS SYSTEM ON TRACK
TO DIVE SOUTHEAST THROUGH SOUTHERN NEVADA AND INTO NORTHWEST
ARIZONA THIS AFTERNOON. PRETTY DECENT COLD POOL ALOFT WILL COMBINE
WITH DYNAMICS AND INCREASING MOISTURE TO PRODUCE GENERALLY
SCATTERED SHOWERS AND THUNDERSTORMS OVER MOST OF THE FORECAST AREA
EXCEPT MAYBE THE SOUTHWEST OVER BY BARSTOW. SOME LOCAL SNOW
ACCUMULATIONS ARE POSSIBLE IN HIGHER ELEVATIONS OF SOUTHERN NEVADA
AND PERHAPS FAR NORTHWEST ARIZONA. PRETTY STRONG SURFACE GRADIENT
ALREADY IN PLACE OVER WESTERN SAN BERNARDINO COUNTY WITH DAGGETT
AND TWENTY NINE PALMS BLOWING AT WIND ADVISORY LEVELS. SURFACE
GRADIENT REMAINS STRONG ALL DAY AND INCREASES IN THE NORTHWEST
PORTION OF THE FORECAST AREA WHILE A STRONG NORTHERLY UPPER JET
PROGRESSES EAST OVER THE WESTERN PORTION OF THE FORECAST AREA.
GIVEN THESE FACTORS...DECIDED TO ISSUE A WIND ADVISORY FOR
BASICALLY THE WESTERN HALF OF THE FORECAST AREA...INYO...SAN
BERNARDINO...ESMERALDA AND NYE COUNTIES. THE REST OF THE FORECAST
AREA WILL PROBABLY SEE BREEZY CONDITIONS BY THE AFTERNOON.
TEMPERATURES WILL BE 10 TO 15 DEGREES COOLER TODAY. AFTER SOME
LINGERING SHOWERS IN EASTERN ZONES THIS EVENING...HIGH PRESSURE
BUILDS OVER THE AREA FRIDAY WITH DRY AND WARMER CONDITIONS. YET
ANOTHER UPPER TROUGH EXPECTED TO APPROACH THE AREA LATE SATURDAY
RESULTING IN INCREASING SOUTH TO SOUTHWEST WINDS AND A CHANCE OF
SHOWERS INTO THE SIERRA LATE. MODELS IN AGREEMENT MOVING THIS
SYSTEM INTO NEVADA SATURDAY NIGHT WITH ROUGHLY THE NORTHERN HALF
OF THE FORECAST AREA SEEING A CHANCE OF SHOWERS.

.LONG TERM...GOOD MODEL CONSENSUS WITH THE SUNDAY STORM SYSTEM AS
THE LOW CENTER PROGGED TO BE OVER SOUTHERN CAL/SOUTHERN NEVADA AND
WESTERN ARIZONA. DECENT AMOUNT OF MOISTURE AND DYNAMICS ASSOCIATED
WITH THE SYSTEM AND NOW WITH A MORE SOUTHERN POSITION...MOST AREAS
WILL SEE AT LEAST A SLIGHT CHANCE OF SHOWERS. THUNDERSTORMS WILL BE
POSSIBLE UNDER THE -26 DEG CELSIUS COLD POOL AND IN THE WRAP
AROUND MOISTURE TO THE EAST AND NORTH. BREEZY CONDITIONS AND COOLER
TEMPERATURES ARE ALSO EXPECTED. THE SYSTEM MOVES INTO CENTRAL
ARIZONA SUNDAY NIGHT AND THEN TO THE ARIZONA/NEW MEXICO BORDER
MONDAY. THIS WILL LEAVE A NORTH TO NORTHEASTERLY UPPER FLOW OVER THE
CWA. WRAP AROUND MOISTURE WILL PROVIDE LINGERING SHOWERS FOR THE
EASTERN CWA SUNDAY NIGHT AND POSSIBLY INTO MONDAY AS WELL. BRIEF
RIDGING MONDAY NIGHT BEFORE ANOTHER STORM MOVES INTO THE WEST COAST
TUESDAY AND NORTH OF THE AREA TUESDAY NIGHT INTO WEDNESDAY.THIS
COULD POTENTIALLY INCREASE WINDS AND COOL TEMPERATURES SLIGHTLY.
&&

.AVIATION...FOR KLAS: SOUTHWEST WINDS GENERALLY UNDER 10 KTS WILL
BECOME NORTHWEST AROUND 10 KTS LATER THIS MORNING. WINDS WILL
INCREASE AND BECOME GUSTY THIS AFTERNOON WITH WIND SPEEDS AROUND 20
KTS AND GUSTS TO AROUND 30 KTS. ISOLATED THUNDERSTORMS WILL ALSO BE
POSSIBLE IN AND AROUND THE LAS VEGAS VALLEY THIS AFTERNOON AS WELL
AS WITHIN THE MORMON MESA AND PEACH SPRINGS CORRIDORS.

REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA: STRONG WESTERLY SURFACE WINDS ARE EXPECTED TO CONTINUE
OVER THE WESTERN REGIONS OF SAN BERNARDINO COUNTY THIS MORNING
BEFORE BECOMING NORTHWEST THIS AFTERNOON. SUSTAINED WIND SPEEDS
AROUND 30 KTS WITH GUSTS TO 45 KTS ARE EXPECTED WITH REDUCTION IN
VISIBILITY DUE TO BLOWING DUST AND SAND POSSIBLE. ELSEWHERE...
WIDESPREAD NORTHWEST WINDS BETWEEN 20 AND 30 KTS WITH GUSTS TO 40
KTS EXPECTED THIS AFTERNOON. LIGHT SHOWERS AND ISOLATED TSTORMS WILL
ALSO BE A POSSIBILITY THIS AFTERNOON OVER THE NORTHERN/CENTRAL AND
EASTERN FORECAST AREA.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
.NV...WIND ADVISORY UNTIL 8 PM ZONE 14.
      WIND ADVISORY 11 AM UNTIL 8 PM ZONE 17.
.AZ...NONE.
.CA...HIGH WIND WARNING UNTIL 8 PM ZONE 523.
      WIND ADVISORY UNTIL 8 PM ZONES 524>526.
      WIND ADVISORY 11 AM UNTIL 8 PM ZONES 520 AND 522.
&&

MORGAN/HARRISON/SALMEN

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