Severe Thunderstorm Warning 48, NWS Las Vegas, NV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
220 PM PDT SAT SEP 5 2009

.SYNOPSIS...A LARGE AREA OF LOW PRESSURE WILL GRADUALLY MOVE THROUGH
THE PACIFIC NORTHWEST THROUGH TUESDAY. THIS WILL RESULT IN A DRY
WESTERLY FLOW OVER MOST OF THE SOUTHERN GREAT BASIN AND MOJAVE
DESERT. HOWEVER...SOME MONSOON MOISTURE WILL LINGER OVER PORTIONS OF
MOHAVE COUNTY LEADING TO A SLIGHT CHANCE OF LATE DAY THUNDERSTORMS.
TEMPERATURES WILL BE NEAR NORMAL THROUGH TUESDAY.
&&

.SHORT TERM...MODELS STILL INDICATING A MOIST AND UNSTABLE AIR MASS
ACROSS MOHAVE...SOUTHERN CLARK AND EASTERN SAN BERNARDINO COUNTY
THROUGH EARLY THIS EVENING. KEPT SCATTERED THUNDERSTORMS IN THE
FORECAST OVER THESE AREAS THROUGH THIS EVENING. MEANWHILE...DRY AND
STABLE AIR HAS BEEN PUSHING INTO MOST OF THE REMAINDER OF THE
FORECAST AREA IN RESPONSE TO A LARGE LOW PRESSURE SYSTEM APPROACHING
THE PACIFIC NORTHWEST. THIS DRYING TREND WILL CONTINUE ALTHOUGH JUST
ENOUGH MOISTURE AND INSTABILITY WILL LINGER OVER EASTERN MOHAVE
COUNTY FOR A SLIGHT CHANCE OF THUNDERSTORMS SUNDAY THROUGH TUESDAY.
TEMPERATURES WILL BE PRETTY CLOSE TO NORMAL THROUGH TUESDAY.

.LONG TERM...NO CHANGE FOR THE PERIOD RUNNING TUESDAY THROUGH
FRIDAY.  RIDGING WILL BUILD OVER THE REGION DURING THE
PERIOD...RESULTING IN DAYTIME MAX TEMPERATURES JUST SLIGHTLY ABOVE
NORMAL THROUGH THE SECOND HALF OF THE WEEK. WITH THE HIGH CENTERED
NORTH OF THE AREA...THEN SLIDING TO THE EAST OVER THE
WEEK...SOUTHEAST FLOW WILL PULL JUST ENOUGH MOISTURE ACROSS MOHAVE
COUNTY FOR ISOLATED THUNDERSTORMS EACH AFTERNOON...MAINLY OVER
HIGHER TERRAIN.
&&

.AVIATION...FOR MCCARRAN...WINDS WILL TURN TO THE SOUTH/SOUTHWEST
LATER THIS AFTERNOON AS OUTFLOW BOUNDARIES FROM STORMS SOUTH OF THE
AREA MAKE THEIR WAY TO THE LAS VEGAS VALLEY. THUNDERSTORM ACTIVITY
WILL LIKELY REMAIN SOUTH AND EAST OF THE VALLEY DUE TO SIGNIFICANT
WARMING AT MID LEVELS MOVING IN FROM THE WEST AND CAPPING OFF ANY
CONVECTIVE DEVELOPMENT OVER LAS VEGAS AND TO THE WEST.
SUNDAY...THUNDERSTORM ACTIVITY WILL AGAIN STAY EAST OF THE LAS VEGAS
VALLEY...IMPACTING THE PEACH SPRINGS AND MORMON MEAS CORRIDORS.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...THUNDERSTORMS WILL DEVELOP AND CONTINUE INTO THE EARLY
EVENING  OVER NORTHWEST ARIZONA...EASTERN LINCOLN...AND FAR EASTERN
CLARK AND SAN BERNARDINO COUNTIES. ERRATIC/GUSTY WINDS WILL BE
POSSIBLE WITH ANY THUNDERSTORM. SUNDAY...MOHAVE COUNTY WILL STILL
SEE A CHANCE OF THUNDERSTORMS...BUT ELSEWHERE...CONDITIONS WILL BE
TOO STABLE.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...NONE.
AZ...NONE.
CA...NONE.
&&

HARRISON/KENNEDY

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
608 AM PDT SAT SEP 5 2009

CAZ519>526-NVZ014>020-022-060700-
EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
DEATH VALLEY NATIONAL PARK-WESTERN MOJAVE DESERT-
EASTERN MOJAVE DESERT-MORONGO BASIN-CADIZ BASIN-
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-
608 AM PDT SAT SEP 5 2009

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

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

AZZ001>003-036-CAZ527-NVZ021-060700-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-SAN BERNARDINO COUNTY-
UPPER COLORADO RIVER VALLEY-
608 AM PDT SAT SEP 5 2009 /608 AM MST SAT SEP 5 2009/

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

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS WILL DEVELOP NEAR AND EAST OF
THE COLORADO RIVER THIS AFTERNOON AND EVENING. ISOLATED FLASH
FLOODING AND SEVERE WIND GUSTS MAY BE POSSIBLE BUT THE POTENTIAL
WILL BE REDUCED TODAY COMPARED TO FRIDAY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

ISOLATED THUNDERSTORMS WILL BE CONFINED TO EASTERN MOHAVE COUNTY
SUNDAY AND LABOR DAY. ADDITIONAL MOISTURE COULD SPREAD BACK INTO
NORTHWEST ARIZONA BY THE MIDDLE OF THE WEEK LEADING TO SLIGHTLY
GREATER COVERAGE OF THUNDERSTORMS.

.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.

JA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
305 PM PDT SAT SEP 05 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     FLASH FLOOD      11 W VALENTINE          35.41N 113.86W
09/04/2009                   MOHAVE             AZ   PUBLIC

            THE VALLE VISTA COUNTRY CLUB REPORTED WATER WITH
            ROCKS...BOULDERS...AND OTHER DEBRIS ACROSS SEVERAL
            ROADWAYS IN THE VALLE VISTA AREA.

0800 PM     FLASH FLOOD      4 W NIPTON              35.46N 115.36W
09/04/2009                   SAN BERNARDINO     CA   PUBLIC

            THE OWNER OF THE NIPTON TRADING POST REPORTED FLOWING
            WATER FROM A NEARBY WASH ACROSS NIPTON ROAD WITH DEBRIS.

&&

KLABELLE