Flash Flood Warning 51, NWS Las Vegas, NV

060 
WGUS75 KVEF 100321
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
821 PM MST SAT JUL 9 2011

AZC015-100331-
/O.EXP.KVEF.FF.W.0051.000000T0000Z-110710T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOHAVE AZ-
821 PM MST SAT JUL 9 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 830 PM MST FOR WEST CENTRAL
MOHAVE COUNTY...

THUNDERSTORMS HAVE MOVED OUT OF THE AREA AND THERE HAVE BEEN NO 
REPORTS OF FLOODING. 

LAT...LON 3572 11399 3540 11431 3560 11446 3584 11416

$$

JH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
430 PM PDT SAT JUL 9 2011

.SYNOPSIS...A LOW PRESSURE SYSTEM BUILDING OVER THE WEST COAST WILL
BRING DRIER AIR TO THE AREA INTO THE FIRST OF NEXT WEEK. THIS
WILL RESULT IN THUNDERSTORM CHANCES DECREASING FROM WEST TO EAST
WITH THUNDERSTORMS BEING PUSHED OUT OF THE AREA BY THE MIDDLE OF
NEXT WEEK. TEMPERATURES WILL BE NEAR NORMAL.
&&

.UPDATE...THUNDERSTORMS FORMED OVER THE SAN BERNARDINO MOUNTAINS OF
WESTERN SAN BERNARDINO COUNTY AND HAVE MOVED INTO THE SOUTHWESTERN
PORTION OF THE CWA. HAVE UPDATED THE ZONES/GRIDS TO REFLECT THESE
THUNDERSTORMS THROUGH THE EVENING HOURS.
&&

.PREV DISCUSSION...
245 PM PDT SAT JUL 9 2011

.SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT...SO FAR CONSIDERABLY
LESS AFTERNOON THUNDERSTORM ACTIVITY TODAY THAN THE PAST FEW DAYS.
DRIER AIR ALOFT AND AT THE SURFACE PUSHING IN FROM THE WEST. THIS IS
REFLECTED IN THUNDERSTORMS BEING CONFINED TO MAINLY LINCOLN...CLARK
AND MOHAVE COUNTIES. EXPECT THIS ACTIVITY TO CONTINUE INTO THE
EVENING HOURS BEFORE DECREASING AS DAYTIME HEATING/OROGRAPHICS ARE
THE MAIN FOCUSING MECHANISM FOR TODAY. BY SUNDAY...DEVELOPING TROUGH
ALONG/OVER THE WEST COAST WILL CONTINUE TO BRING DRIER SOUTHWEST
FLOW ALOFT OVER THE CWA WHICH SHOULD SUPPRESS THUNDERSTORMS TO THE
EASTERN PORTION OF LINCOLN AND MOHAVE COUNTIES. ONCE AGAIN DO NOT
SEE MUCH OF A TRIGGER MECHANISM BESIDES DAYTIME HEATING. HOWEVER
WEAK FLOW ALOFT/PWAT VALUES OVER AN INCH STILL INDICATES POSSIBLE
FLASH FLOOD PROBLEMS. MONDAY WILL CONTINUE THE DRYING PROCESS AS THE
TROUGH KEEPS SOUTHWEST FLOW OVER THE AREA AND WILL LIMIT THE
THUNDERSTORMS TO BASICALLY MOHAVE COUNTY. SHORT RANGE MODELS HAVE
BEEN TRENDING SLOWER WITH THE TROUGH DRYING THE CWA OUT AND DUE TO
THIS FACT IT APPEARS THAT THE FINAL DRYING WILL TAKE PLACE IN THE
EXTENDED...THUS CONTINUED MENTION OF ISOLATED ACTIVITY OVER MOHAVE
COUNTY ON TUESDAY...BUT CONFIDENCE ON THIS IS LOW. LOWERING
HEIGHTS/THICKNESS DUE TO THE DEVELOPING TROUGH WILL LIKELY BALANCE
OUT THE DRYING TREND...RESULTING IN TEMPERATURES NEAR NORMAL FOR
THIS TIME OF YEAR THROUGH THE SHORT TERM.
&&

.LONG TERM...THE MAIN ISSUE DURING THE PERIOD FROM LATE WEDNESDAY
MORNING ONWARD WILL BE THE INFLUENCE OF THE LONGWAVE UPPER LEVEL
TROUGH AXIS THAT SETS UP ALONG THE WEST COAST. A CLOSED LOW IS SHOWN
BY THE MODELS TO MOVE THROUGH THE PAC NW WEDNESDAY INTO THURSDAY
WITH AN ELONGATED PIECE OF ENERGY HEADING TOWARDS THE CALIFORNIA
COAST. THIS SHOULD INCREASE SOUTHWEST FLOW ACROSS THE ENTIRE AREA
SPREADING IN DRY AIR EVEN INTO AREAS EAST OF THE COLORADO RIVER
VALLEY. AS A RESULT...WE KEPT THE FORECAST DRY AREAWIDE FOR BOTH
WEDNESDAY AND THURSDAY. ANOTHER PIECE OF ENERGY IS SHOWN TO DROP
SOUTHWARD TOWARDS THE WATERS OFF OF NORCAL ON FRIDAY WHICH WILL HELP
TO REINFORCE THE TROUGH OFFSHORE. ONCE AGAIN THIS WILL KEEP THE AREA
DRY ON FRIDAY. THERE MAY BE SOME HIGH CLOUDS OVER THE NW CWFA DURING
THIS TIME FRAME...BUT OTHERWISE IT WILL BE CLEAR ACROSS THE REST OF
THE AREA. WITH THE TROUGH OFFSHORE AND THE JET MOVING
OVERHEAD...THIS WILL ENHANCE SOUTHWEST WINDS ACROSS THE AREA
ESPECIALLY IN THE AFTERNOON AND EVENING HOURS EACH DAY FROM
WEDNESDAY TO FRIDAY. THE COMBINATION OF ENHANCED SYNOPTIC SUPPORT
AND THE TYPICAL DIURNAL TRENDS OF SOUTH TO SOUTHWEST WINDS IN THE
LATE AFTERNOON AND EVENING WILL CREATE THE POTENTIAL FOR GUSTS OF
25-30 MPH IN THIS TIME FRAME. HIGH TEMPS WERE LOWERED SLIGHTLY DUE
TO THE LOWER HEIGHTS AND IN THE FAR SOUTHWEST PLACES LIKE BARSTOW
AND YUCCA VALLEY MAY SEE SOME ADDITIONAL COOLING AS SOME MARINE AIR
GETS PULLED INLAND BY THE TROUGH.

BY SATURDAY INTO SUNDAY THE FLOW ALOFT ACROSS THE AREA IS SHOWN TO
TURN MORE SOUTHERLY AS A LARGE UPPER RIDGE SETS UP OVER MISSOURI AND
KANSAS. MODELS SHOW THE RETURN OF MID-LEVEL MOISTURE INTO THE AREA
SATURDAY AND ESPECIALLY SATURDAY NIGHT INTO SUNDAY. PWATS OFF THE
GFS ARE FORECAST TO REACH AN INCH OVER ALL OF MOHAVE COUNTY BY NEXT
SUNDAY AND EVEN INTO MUCH OF CLARK AND SOUTHEAST SAN BERNARDINO
COUNTIES. FOR NOW I INCREASED AFTERNOON AND EVENING CLOUD COVER.
SLIGHT CHANCE POPS WERE ALSO INTRODUCED OVER MOHAVE COUNTY BOTH
AFTERNOONS AND IT IS POSSIBLE THEY MAY NEED TO BE EXPANDED FURTHER
DEPENDING ON HOW THINGS TREND. WITH THE RISE IN HEIGHTS...TEMPS
SHOULD TREND UP A LITTLE...HOWEVER IF MOISTURE SURGES IN
GREATER...THEN ANY WARMING WILL BE TEMPERED.
&&

.AVIATION...FOR MCCARRAN...WINDS HAVE ALREADY BECOME ERRATIC AND
GUSTY THIS AFTERNOON DUE TO OUTFLOW BOUNDARIES FROM THUNDERSTORMS TO
THE SOUTH OF THE AIRPORT. DEPENDING ON WHAT EXACTLY DEVELOPS IN AND
NEAR THE LAS VEGAS VALLEY WILL DETERMINE HOW WINDS TREND THIS
EVENING AS STORMS WILL KEEP THE POTENTIAL FOR ERRATIC CHANGES IN
SPEED AND DIRECTION GOING. FOR NOW WILL KEEP A CB IN THE TAF FOR THE
SLIGHT THUNDERSTORM POTENTIAL AT THE AIRPORT COMPLEX AND AMEND THE
TAF IF NEED BE. OTHERWISE WINDS WILL FOLLOW DIURNAL DIRECTIONAL
TRENDS THROUGH SUNDAY AFTERNOON. GUSTS OF 20-25 KTS WILL BE POSSIBLE
SUNDAY AFTERNOON AND EARLY EVENING. CLOUDS WILL BE SCT-BKN AOA 8K
FEET THIS EVENING...WITH FEW IF ANY CLOUDS AROUND ON SUNDAY.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...TSRA WILL BE AROUND ACROSS MOHAVE...CLARK...LINCOLN AND
EASTERN SAN BERNARDINO COUNTIES THIS EVENING AND AGAIN ON SUNDAY IN
THE AFTERNOON AND EVENING IN MOHAVE AND EASTERN LINCOLN COUNTIES.
THE MAIN IMPACTS IN AND NEAR STORMS WILL BE GUSTY AND ERRATIC WINDS
AND REDUCED CIGS AND VSBY. OTHERWISE AWAY FROM ANY TSRA OR
THUNDERSTORM OUTFLOW BOUNDARIES...WINDS WILL MAINLY TREND TOWARDS
DIURNAL DIRECTIONS WITH GUSTY SOUTH TO SOUTHWEST WINDS OF 15-25 KTS
SUNDAY AFTERNOON. SCT-BKN CLOUDS AOA 8K FEET IN THE EASTERN PART OF
THE AREA THIS EVENING AND FAR EAST ON SUNDAY AFTERNOON AND EVENING.
OTHERWISE A MAINLY CLEAR SKY IS EXPECTED THROUGH SUNDAY EVENING.
&&

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

UPDATE...JENSEN
PREV DISCUSSION...JENSEN/STACHELSKI

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
457 AM PDT SAT JUL 9 2011

AZZ001>003-036-CAZ519>527-NVZ014>022-100300-
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-
457 AM PDT SAT JUL 9 2011 /457 AM MST SAT JUL 9 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. GREATEST CONCERN FOR
THUNDERSTORMS WILL BE ACROSS MOHAVE...CLARK...LINCOLN...AND
EASTERN SAN BERNARDINO COUNTIES. BURSTS OF HEAVY RAIN AND
LOCALIZED FLOODING REMAIN A CONCERN ALONG WITH STRONG GUSTY WINDS.
REMEMBER...DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS OR LOW
WATER CROSSINGS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORM CHANCES WILL DIMINISH SUNDAY AND MONDAY AS DRIER AIR
WORKS IN FROM THE WEST. MOHAVE COUNTY WILL SEE THE GREATEST CHANCE
WITH DECREASING CHANCES FURTHER WEST. THUNDERSTORMS ARE EXPECTED
TO BE OUT OF THE REGION BY WEDNESDAY AS DRIER AIR WORKS OVER THE
ENTIRE AREA. ITS POSSIBLE THAT MONSOON MOISTURE COULD MAKE A
RETURN TO MOHAVE COUNTY LATE NEXT WEEK.

.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.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
501 PM PDT SAT JUL 09 2011

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

0410 PM     HEAVY RAIN       1 S SPRING VALLEY       36.09N 115.24W
07/09/2011  E1.00 INCH       CLARK              NV   PUBLIC

            THE PUBLIC REPORTED AT LEAST A FEW INCHES OF WATER WAS
            COVERING RAINBOW BOULEVARD BETWEEN THE 215 BELTWAY AND
            TROPICANA AVENUE.

0410 PM     HEAVY RAIN       3 SSW SPRING VALLEY     36.06N 115.26W
07/09/2011  M0.55 INCH       CLARK              NV   MESONET

            AN AUTOMATED RAIN GAUGE FROM THE CLARK COUNTY REGIONAL
            FLOOD CONTROL DISTRICT MEASURED A STORM TOTAL OF 0.55
            INCH NEAR BUFFALO AND THE 215 BELTWAY IN NEARLY AN HOUR.

0427 PM     TSTM WND GST     5 ENE DOWNTOWN LAS VEGA 36.20N 115.06W
07/09/2011  M56.00 MPH       CLARK              NV   TRAINED SPOTTER

            A SPOTTER MEASURED A 56 MPH THUNDERSTORM WIND GUST NEAR
            NELLIS AND CAREY WITH A HAND HELD ANEMOMETER.

&&

STACHELSKI

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
556 PM PDT SAT JUL 09 2011

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

0420 PM     HEAVY RAIN       3 SE DOWNTOWN LAS VEGAS 36.14N 115.12W
07/09/2011  E0.20 INCH       CLARK              NV   NEWSPAPER

            NEWSPAPER REPORT OF POOR DRAINAGE FLOODING WITH A FEW
            INCHES OF WATER NEAR THE INTERSECTION OF SAHARA AND
            EASTERN. THE EVENT TIME IS AN ESTIMATE.

&&

STACHELSKI