Severe Thunderstorm Warning 80, NWS Las Vegas, NV

425 
WWUS55 KVEF 062003
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
103 PM PDT WED JUL 6 2011

NVC003-062015-
/O.CON.KVEF.SV.W.0080.000000T0000Z-110706T2015Z/
CLARK NV-
103 PM PDT WED JUL 6 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM PDT
FOR WEST CENTRAL CLARK COUNTY...

AT 1259 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED OVER WEST CENTRAL CLARK COUNTY...OR 13 MILES SOUTHWEST OF RED
ROCK CANYON...MOVING NORTHWEST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL IMPACT HIGHWAY 160 BETWEEN MILE MARKERS 
26 AND 35.

LAT...LON 3600 11575 3614 11568 3605 11557 3597 11560
TIME...MOT...LOC 2003Z 125DEG 3KT 3603 11563

$$

JGG

956 
WWUS55 KVEF 062014
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
114 PM PDT WED JUL 6 2011

NVC003-062024-
/O.EXP.KVEF.SV.W.0080.000000T0000Z-110706T2015Z/
CLARK NV-
114 PM PDT WED JUL 6 2011

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL CLARK COUNTY WILL
EXPIRE AT 115 PM PDT...

STRONG THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL CONTINUE. 
ADDITIONAL SEVERE STORMS MAY REDEVELOP IN THE AREA BUT THEY ARE 
BELOW SEVERE LIMITS FOR NOW.

LAT...LON 3600 11575 3614 11568 3605 11557 3597 11560
TIME...MOT...LOC 2014Z 125DEG 3KT 3604 11564

$$

JGG

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
1056 AM PDT WED JUL 6 2011

.SYNOPSIS...MONSOON MOISTURE WILL KEEP CHANCES FOR THUNDERSTORMS
OVER THE MOJAVE DESERT AND SOUTHERN GREAT BASIN THROUGH FRIDAY.
HEAVY RAIN ASSOCIATED WITH THUNDERSTORMS COULD LEAD TO LOCALIZED
FLASH FLOODING. DRIER AIR FROM THE WEST WILL LOWER THUNDERSTORM
CHANCES OVER THE WEEKEND WITH THE MOISTURE POSSIBLY BEING SCOURED
OUT OF NORTHWEST ARIZONA EARLY NEXT WEEK.
&&

.UPDATE...ISSUED THE EXPANDED FLASH FLOOD WATCH TO COVER ALL OF
CLARK...MOST OF MOHAVE AND THE NORTHERN PART OF SAN BERNARDINO
COUNTIES. SAME VALID TIME OF 19-05Z. CONVECTION ALREADY FIRING UP IN
NORTHEAST CLARK AND FAR SOUTHERN NYE COUNTIES.
&&

.PREV UPDATE...1005 AM...HAVE DECIDED TO EXPAND THE FLASH FLOOD
WATCH TO INCLUDE ALL OF CLARK COUNTY AND SAN BERNARDINO COUNTIES.
THE MCS PUSHED UP A BIG INCREASE IN MOISTURE TO OUR AREA. THE VEF
RAOB WENT FROM 1.17 TO 1.55 PWAT FROM 00Z TO 12Z...AND LIFTED
INDICES WENT UP AS WELL.  DIFFERENTIAL SURFACE HEATING ALONG THE
CLOUD SHIELD TO OUR NORTH FROM LAST NIGHTS MCS WILL BECOME A FOCUS
FOR CONVECTION INITIATION. THE MCV IS THE OTHER FACTOR TODAY. SHORT
TERM PROGS BRING THE CENTER OF IT NEAR THE TIP OF SOUTHERN NEVADA
THIS AFTERNOON AND  NO DOUBT THE ASSOCIATED LIFT/PVA/CONVERGENCE AND
LIGHT WINDS WILL MAKE FOR WET AND SLOW MOVING STORMS. WE WILL HAVE
AN ACTIVE DAY. WILL BE UPDATING FORECAST PRODUCTS SOON.
&&

.AVIATION...FOR MCCARRAN...THE MAIN FORECAST ISSUE FOR TODAY WILL BE
WHETHER THE MASSIVE THUNDERSTORM COMPLEX THAT MOVED INTO THE
SOUTHERN CWA EARLIER THIS MORNING PROVIDES A FOCUS FOR THUNDERSTORM
ACTIVITY WITHIN THE VALLEY. BASED ON A MODIFIED VERSION OF THIS
MORNINGS SOUNDING AND DISREGARDING ANY POTENTIAL THUNDERSTORM
OUTFLOW INITIATING STORMS EARLIER...THE PLAN IS TO INTRODUCE A TEMPO
GROUP FOR TSRA WITH THE 18Z PACKAGE STARTING AT 21 OR 22Z THIS
AFTERNOON. WINDS MAY STAY IN A MORE EAST TO SOUTHEAST DIRECTION INTO
THE EARLY AFTERNOON BEFORE SWINGING TO THE SOUTHWEST. CLOUDS MAY
THIN SOMEWHAT OVER THE NEXT HOUR OR TWO BUT SHOULD FILL BACK IN FOR
BKN CLOUD COVER THIS AFTERNOON. THERE WILL BE A CHANCE FOR TSRA IN
ALL OF THE APPROACH CORRIDORS THROUGH THIS EVENING.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...THUNDERSTORMS ARE BEGINNING TO FIRE ALREADY THIS
MORNING IN EASTERN CLARK AND SOUTHERN NYE COUNTY. LOOK FOR SCT SHRA
AND TSRA TO DEVELOP ACROSS MUCH OF THE AREA ONCE AGAIN LATER THIS
MORNING INTO THE AFTERNOON AND EVENING CREATING AREAS OF GUSTY AND
ERRATIC WINDS...REDUCED CIGS AND VSBY DUE TO HEAVY RAIN AND BLDU.
THE MAIN FOCUS FOR ACTIVITY LATER TODAY INTO THIS EVENING LOOKS TO
BE ACROSS THE SOUTHERN GREAT BASIN AS WELL AS INTO DEATH VALLEY
NATIONAL PARK. AWAY FROM TSRA AND OUTFLOW BOUNDARIES...WINDS WILL
GENERALLY FOLLOW TYPICAL DIURNAL DIRECTIONAL TRENDS. -SALMEN
&&

.PREV DISCUSSION...
428 AM PDT WED JUL 6 2011

.SHORT TERM...VERY ACTIVE LATE EVENING/EARLY MORNING OVER THE LOWER
COLORADO RIVER VALLEY AS MCS BROUGHT HEAVY RAIN AND SEVERE WINDS TO
LAKE HAVASU CITY AND NEEDLES. GUSTS UP TO 50 MPH WERE REPORTED NORTH
TO BULLHEAD CITY AS OUTFLOW BOUNDARY MOVED NORTHWARD. MCS NOW
DECAYING OVER EASTERN CALIFORNIA AS CLOUD TOPS WARM. AREA OF LIGHT
RAIN SHOWERS ALONG WITH EMBEDDED ISOLATED THUNDERSTORMS OVER EASTERN
SAN BERNARDINO COUNTY ALSO SHRINKING AS IT MOVES WESTWARD. ANOTHER
AREA OF RAIN SHOWERS OVER MOHAVE COUNTY BETWEEN DOLAN SPRINGS AND
MEADVIEW IS MOVING WEST AND IF SHOWERS HOLD TOGETHER LONG ENOUGH
THEY SHOULD BE TO LAS VEGAS AROUND 7 AM.

AFTER MANY PARTS OF THE AREA GOT WORKED OVER YESTERDAY/EARLY THIS
MORNING...WHERE WILL BE THE HOT SPOT TODAY. USING RECENT HISTORY AS
MY GUIDE. AREAS THAT SAW STRONG STORMS SUNDAY HAD A DOWN DAY
MONDAY...AND BACK UP TUESDAY. WITH BOUNDARY LAYER WORKED OVER BY MCS
BELIEVE THE SOUTHERN AREAS WILL HAVE A DIFFICULT TIME RECOVERING SO
DID TRIM BACK POPS SOME THIS AFTERNOON AND EVENING. MODELS DO
INDICATE AN UPPER LEVEL DISTURBANCE OR MAY BE A MCV FROM DECAYING
MCS OVER THE LOWER COLORADO RIVER WHICH SLOWLY DRIFT NORTHWARD INTO
SOUTHERN CLARK OR NORTHEAST SAN BERNARDINO COUNTY THIS AFTERNOON.
EXTENSIVE CLOUDINESS ASSOCIATED WITH THIS FEATURE WILL LIKELY SET UP
A DIFFERENTIAL HEATING BOUNDARY WHICH WOULD BE THE AREA FOR STRONG
THUNDERSTORMS AND HEAVY RAIN. THINKING THIS BOUNDARY WILL LIE
NORTHWEST OF THIS MCV...ACROSS INYO AND NYE COUNTY DURING MAX
HEATING. AIR MASS JUICED AS PRECIP. WATER VALUES OVER 200 PCT OF
NORMAL IN SOME AREAS. SO DECIDED TO GO OUT WITH A FLASH FLOOD WATCH
FOR EASTERN INYO COUNTY AS WELL AS ESMERALDA...SOUTHERN HALF OF NYE
COUNTY AND WESTERN CLARK COUNTY FROM NOON UNTIL 9 PM. IN ANOTHER 6
HOURS...FOLLOWING SHIFT CAN HOPEFULLY PINPOINT ANY ADDITIONAL AREAS
THAT MAY NEED A WATCH. NOT MUCH CHANGE IN THE OVERALL PATTERN
THURSDAY AND FRIDAY AS WELL ABOVE NORMAL PRECIP. WATER VALUES
CONTINUE.

.LONG TERM...DUE TO ONGOING WEATHER EARLY THIS MORNING LITTLE
CHANGE WAS MADE TO EXTENDED GRIDS. MODELS SHOWING DRIER AIR WORKING
INTO THE AREA FROM THE NORTHWEST OVER THE WEEKEND. THUNDERSTORMS
WILL BECOME MORE ISOLATED OVER THE WEST HEADING INTO THE WEEKEND.
WHETHER DRIER CONDITIONS PUSH ENTIRELY THROUGH THE CWA NEXT WEEK AS
MODELS ARE SHOWING IS VERY UNCERTAIN. TO ACCOUNT FOR THE
UNCERTAINTY...DID NOT REMOVE TSTORMS ALTOGETHER BUT LINGERED THEM
ACROSS NORTHEAST MOHAVE COUNTY IN CASE THE MOISTURE DOES NOT GET
ENTIRELY FLUSHED. TEMPERATURES SHOULD WARM TO AROUND NORMAL LEVELS
EACH DAY BUT WILL BE DEPENDENT ON THE THICKNESS AND TIMING OF CLOUD
COVER. WINDS IN GENERAL ARE EXPECTED TO BE LIGHT THURSDAY AND FRIDAY
BUT COULD BECOME GUSTY FROM THE SOUTHWEST OVER THE WEEKEND INTO
EARLY NEXT WEEK IF A PACIFIC TROUGH IS ABLE TO PUSH FAR ENOUGH
INLAND AND FAR ENOUGH SOUTH.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...FLASH FLOOD WATCH UNTIL 10 PM PDT THIS EVENING FOR NVZ014-
     016>022.
AZ...FLASH FLOOD WATCH UNTIL 10 PM MST THIS EVENING FOR AZZ001-003-
     036.
CA...FLASH FLOOD WATCH UNTIL 10 PM PDT THIS EVENING FOR CAZ522>524.
&&

UPDATE...JACQUES
DISCUSSION...PIERCE
AVIATION...STACHELSKI

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
1156 AM PDT WED JUL 6 2011

AZZ001-003-036-CAZ522>524-NVZ014-016>022-071000-
NORTHWEST PLATEAU-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-DEATH VALLEY NATIONAL PARK-
WESTERN MOJAVE DESERT-EASTERN MOJAVE DESERT-
ESMERALDA AND CENTRAL NYE COUNTY-NORTHEAST CLARK COUNTY-
WESTERN CLARK AND SOUTHERN NYE COUNTY-SHEEP RANGE-
SPRING MOUNTAINS-LAS VEGAS VALLEY-SOUTHERN CLARK COUNTY-
1156 AM PDT WED JUL 6 2011 /1156 AM MST WED JUL 6 2011/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

FLASH FLOOD WATCH FOR PORTIONS OF CALIFORNIA...NEVADA AND ARIZONA FROM
NOON UNTIL 10 PM THIS EVENING. INCLUDING THE FOLLOWING AREAS...IN
CALIFORNIA...INYO COUNTY TO INCLUDE DEATH VALLEY NATIONAL PARK AND
THE NORTHERN HALF OF SAN BERNARDINO COUNTY. IN NEVADA...ESMERALDA...CLARK
AND SOUTHERN NYE COUNTIES...IN ARIZONA MOHAVE COUNTY. INTENSE RAINFALL
RATES OF UP TO 2 INCHES AN HOUR POSSIBLE WHICH WOULD LEAD TO FLASH
FLOODING OF NORMALLY DRY WASHES.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORMS CHANCES CONTINUE THURSDAY AND FRIDAY WITH HEAVY
RAINFALL A CONCERN. DRIER AIR FROM THE WEST WILL SPREAD EAST OVER
THE WEEKEND LEADING TO A DECREASE IN THUNDERSTORMS OVER THE
WEEKEND AND INTO EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED TODAY IN THE AREAS INSIDE THE FLASH
FLOOD WATCH.

AZZ002-CAZ519>521-525>527-NVZ015-071000-
LOWER COLORADO RIVER VALLEY-EASTERN SIERRA SLOPES-OWENS VALLEY-
WHITE MOUNTAINS OF INYO COUNTY-MORONGO BASIN-CADIZ BASIN-
SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-LINCOLN COUNTY-
1156 AM PDT WED JUL 6 2011 /1156 AM MST WED JUL 6 2011/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORMS CHANCES CONTINUE THURSDAY AND FRIDAY WITH HEAVY
RAINFALL A CONCERN. DRIER AIR FROM THE WEST WILL SPREAD EAST OVER
THE WEEKEND LEADING TO A DECREASE IN THUNDERSTORMS OVER THE
WEEKEND AND INTO EARLY 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
1133 AM PDT WED JUL 06 2011

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

1115 AM     HEAVY RAIN       MT. CHARLESTON          36.28N 115.62W
07/06/2011  E0.00 INCH       CLARK              NV   CO-OP OBSERVER

            MT. CHARLESTON FIRE STATION REPORTS ABOUT THREE INCHES OF
            WATER OVER A FEW ROADWAYS IN TOWN. WATER HAS SINCE
            RECEEDED.

&&

JGG