Flash Flood Warning 42, NWS Las Vegas, NV

807 
WGUS75 KVEF 082047
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
147 PM MST FRI JUL 8 2011

AZC015-082145-
/O.CON.KVEF.FF.W.0042.000000T0000Z-110708T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
147 PM MST FRI JUL 8 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM MST FOR NORTH
CENTRAL MOHAVE COUNTY...

AT 136 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING VERY HEAVY RAIN IN THE AREA. THESE 
STORMS ARE NEARLY STATIONARY. RADAR ESTIMATES MORE 2 AND A HALF 
INCHES OF RAIN HAS FALLEN IN THE WARNED AREA. PARTICULARLY 
VULNERABLE TO FLASH FLOODING IS WHITMORE WASH AND OTHER WASHES 
FEEDING INTO WHITMORE WASH.

THE STORM PRODUCING VERY HEAVY RAIN WILL REMAIN OVER MAINLY RURAL
AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON
AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE
RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED
ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN!

REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL
WEATHER SERVICE FACEBOOK PAGE OR TWITTER #NWSVEGAS.

&&

LAT...LON 3662 11334 3653 11311 3612 11336 3624 11366

$$

JJ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
1039 AM PDT FRI JUL 8 2011

.SYNOPSIS...MONSOON MOISTURE WILL REMAIN IN PLACE OVER THE AREA
THROUGH SATURDAY KEEPING A CHANCE OF AFTERNOON AND EVENING
THUNDERSTORMS. ANY THUNDERSTORMS WILL HAVE THE POTENTIAL TO BRING
HEAVY RAIN AND GUSTY WINDS. A DRIER SOUTHWEST FLOW IS EXPECTED TO
SET UP EARLY NEXT WEEK BRINGING LOWER THUNDERSTORM CHANCES OVER THE
WESTERN HALF OF THE FORECAST AREA AND EVENTUALLY OVER THE ENTIRE
AREA BY MID WEEK.
&&

.UPDATE...CONVECTION FIRING EARLIER TODAY AND MOSTLY IN MOHAVE
COUNTY. BELIEVE THE MAIN FOCUS WILL BE SOUTH OF THE MID LEVEL TROUGH
EVIDENT THIS MORNING FROM EXTREME SOUTHWEST UTAH THROUGH EASTERN
CLARK COUNTY. HOWEVER THERE WILL BE CONVECTION IN ALL AREAS TODAY.
AS IN THE LAST FEW DAYS FLASH FLOODING AND OCCASIONAL MICRO BURSTS
WILL BE THE PRIMARY HAZARDS TO CONTEND WITH TODAY.
&&

.PREV DISCUSSION...
245 AM PDT FRI JUL 8 2011

.SHORT TERM...SHOWERS AND THUNDERSTORMS ARE CONTINUING TO DEVELOP
EARLY THIS MORNING OVER WESTERN AND NORTHERN CLARK COUNTY AND MOVING
IN A NORTHEAST DIRECTION. NAM12 IS INDICATING A STRONG AREA OF 700MB
CONVERGENCE THAT CONTINUES THROUGH 15Z...SO DO EXPECT THESE STORMS
TO DEVELOP FOR THE NEXT FEW HOURS. THESE STORMS HAVE BEEN MOVING AT
A FAIRLY GOOD CLIP AND SO FAR NOT CAUSING ANY MAJOR PROBLEMS. WITH
MONSOONAL MOISTURE STILL IN PLACE LOOK FOR AFTERNOON THUNDERSTORMS
TO DEVELOP ONCE AGAIN OVER MUCH OF THE CWA. NOT SEEING ANY FEATURE
ON SATELLITE THAT WOULD INDICATE A GOOD TRIGGER FOR THIS AFTERNOON
SO WE WILL ONCE AGAIN RELY ON AFTERNOON HEATING AND OROGRAPHICS.
WINDS SHOULD KEEP STORMS MOVING THIS AFTERNOON AND ALTHOUGH ISOLATED
FLASH FLOODING IS POSSIBLE...DO NOT THINK IT WILL BE WIDESPREAD
ENOUGH FOR A WATCH TO BE ISSUED. THUNDERSTORMS ARE LIKELY TO LAST
INTO THE EARLY EVENING...BUT SHOULD DIMINISH OVERNIGHT. SOME DRIER
WILL WORK INTO THE AREA SATURDAY WITH THE BETTER CHANCES OF
THUNDERSTORMS OVER THE EASTERN HALF OF THE CWA. TROUGH MOVING INTO
THE WEST COAST SUNDAY AND MONDAY WILL HELP PUSH THE MOISTURE FURTHER
EAST LEAVING THE AREA MOSTLY DRY WITH ONLY THE EASTERN PORTIONS OF
MOHAVE COUNTY SEEING ANY THUNDERSTORM CHANCES.

.LONG TERM...OPERATIONAL MODELS AND ENSEMBLES ARE STILL AGREEING ON
A SUBSTANTIAL DRYING TREND FOR OUR AREA AS A PACIFIC TROUGH WORKS
ITS WAY INTO THE WEST COAST EARLY NEXT WEEK. KEPT SLIGHT CHANCE TO
LOW END CHANCE POPS IN MOHAVE COUNTY MONDAY AND TUESDAY AFTERNOON
AND EVENING...THEN WENT WITH A DRY FORECAST THEREAFTER. TEMPERATURES
SHOULD BE NEAR TO SLIGHTLY BELOW NORMAL THANKS TO FALLING HEIGHTS
WITH THE INCOMING TROUGH...AND HUMIDITY WILL ALSO DECREASE MARKEDLY
AS THE SOUTHWEST FLOW ASSOCIATED WITH THE TROUGH FLUSHES OUT THE
MONSOON MOISTURE.
&&

.AVIATION...FOR MCCARRAN...AFTERNOON AND EVENING THUNDERSTORMS ARE
POSSIBLE AGAIN TODAY...MAINLY ON THE MOUNTAINS NEAR KLAS AND IN THE
MORMON MESA AND PEACH SPRINGS CORRIDORS. WINDS WILL BE GUSTY AND
ERRATIC NEAR ANY THUNDERSTORMS. CHANCES FOR THUNDERSTORMS WILL BE A
LITTLE LOWER SATURDAY AFTERNOON AND EVENING...THEN SIGNIFICANTLY
LOWER SUNDAY AFTERNOON AND EVENING.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED AGAIN TODAY...WITH THE GREATEST COVERAGE ROUGHLY EAST OF A
LINE FROM THE NEVADA NATIONAL SECURITY SITE TO THE MOJAVE NATIONAL
PRESERVE. A SLIGHT DECREASE IN THUNDERSTORM CHANCES IS EXPECTED ON
SATURDAY...FOLLOWED BY A SIGNIFICANT DECREASE FROM WEST TO EAST ON
SUNDAY.
&&

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

JACQUES/GORELOW/MORGAN

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
552 AM PDT FRI JUL 8 2011

AZZ001>003-036-CAZ519>527-NVZ014>022-090400-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
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-
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-
552 AM PDT FRI JUL 8 2011 /552 AM MST FRI JUL 8 2011/

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL OCCUR AGAIN TODAY AS PLENTY OF
MONSOONAL MOISTURE REMAINS IN PLACE. THUNDERSTORMS WILL DEVELOP OVER
THE MOUNTAINS OF THE MOJAVE DESERT AND SOUTHERN GREAT BASIN THEN
DRIFT INTO THE SURROUNDING VALLEYS. BURSTS OF HEAVY RAIN AND
LOCALIZED FLOODING REMAIN A CONCERN. REMEMBER...DO NOT ATTEMPT TO
TRAVEL ACROSS FLOODED ROADS OR LOW WATER CROSSINGS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS WILL START TO GET PUSHED FURTHER EAST SATURDAY AND
AS DRIER AIR PUSHES IN FROM THE WEST. THUNDERSTORM CHANCES WILL
DIMINISH EVEN MORE SUNDAY AND MONDAY WITH MAINLY MOHAVE COUNTY
SEEING ANY ACTIVITY. THUNDERSTORMS ARE EXPECTED TO BE OUT OF THE
REGION BY TUESDAY AS DRIER AIR WORKS OVER THE ENTIRE AREA.

.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.