Severe Thunderstorm Warning 129, NWS Las Vegas, NV

062 
WWUS55 KVEF 282208
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
308 PM PDT SUN AUG 28 2011

CAC071-282230-
/O.CON.KVEF.SV.W.0129.000000T0000Z-110828T2230Z/
SAN BERNARDINO CA-
308 PM PDT SUN AUG 28 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM PDT
FOR SOUTH CENTRAL SAN BERNARDINO COUNTY...

AT 258 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH AND PEA SIZED HAIL.  THIS STORM WAS LOCATED 7 MILES 
NORTH OF YUCCA VALLEY...OR 21 MILES WEST OF TWENTYNINE PALMS...AND 
WAS MOVING SOUTHEAST AT 5 MPH WITH REDEVELOPMENT BEHIND IT.

LOCATIONS IMPACTED INCLUDE...
JOSHUA TREE...YUCCA VALLEY AND JOSHUA TREE LAKE CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS WHICH CAN BRING
DOWN TREES AND POWER LINES AND CAUSE SIGNIFICANT BLOWING DUST AND
DEBRIS. IN ADDITION...HAIL AND LIGHTNING ARE LIKELY. LIGHTNING CAN
KILL! TAKE COVER IN A SUBSTANTIAL SHELTER AND STAY AWAY FROM WINDOWS
UNTIL THE STORM PASSES.

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

&&

LAT...LON 3406 11650 3412 11652 3414 11647 3421 11644
      3426 11644 3432 11648 3435 11642 3437 11640
      3413 11611 3412 11626 3408 11627 3408 11644
TIME...MOT...LOC 2206Z 326DEG 6KT 3420 11641

$$

JS

407 
WWUS55 KVEF 282224
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
324 PM PDT SUN AUG 28 2011

CAC071-282233-
/O.EXP.KVEF.SV.W.0129.000000T0000Z-110828T2230Z/
SAN BERNARDINO CA-
324 PM PDT SUN AUG 28 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SAN BERNARDINO
COUNTY WILL EXPIRE AT 330 PM PDT...

AT 322 PM PDT...RADAR INDICATED THAT SEVERE WEATHER WAS NO LONGER A 
THREAT IN THE JOSHUA TREE AREA AS THE STORM HAD MOVED AWAY TO THE 
WEST. THEREFORE...THE SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO 
EXPIRE.

LAT...LON 3406 11650 3412 11652 3414 11647 3421 11644
      3426 11644 3432 11648 3435 11642 3437 11640
      3413 11611 3412 11626 3408 11627 3408 11644
TIME...MOT...LOC 2223Z 326DEG 6KT 3418 11639

$$

MORGAN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
930 AM PDT SUN AUG 28 2011

.SYNOPSIS...MOIST AND UNSTABLE AIR IN PLACE WILL ALLOW ISOLATED TO
SCATTERED THUNDERSTORMS TO DEVELOP AGAIN TODAY. A DRIER SOUTHWEST
FLOW WILL DEVELOP MONDAY AND TUESDAY AND WILL LEAD TO A GRADUAL
DECREASE IN THUNDERSTORM COVERAGE FROM WEST TO EAST. EXCESSIVELY HOT
AFTERNOON TEMPERATURES ARE EXPECTED AGAIN MONDAY BEFORE DECREASING
SLIGHTLY THE REST OF THE WEEK.
&&

.UPDATE...VERY IMPRESSIVE MESOSCALE CONVECTIVE VORTEX MENTIONED BY
THE PREVIOUS SHIFT WAS STILL SPINNING OVER LA PAZ COUNTY AS OF 9 AM.
SMALL...SHORT-LIVED THUNDERSTORMS HAD BEEN GENERATING IN ITS EASTERN
SEMICIRCLE MUCH OF THE NIGHT AND MORNING...BUT SATELLITE TRENDS
SUGGEST DRY AIR BEGINNING TO WRAP IN. FORECAST FOR TODAY LOOKS FINE
AND NO UPDATE PLANNED THIS MORNING.
&&

.AVIATION...FOR MCCARRAN...LIGHT AND VARIABLE WINDS SHOULD TAKE ON
AN EASTERLY COMPONENT BY MID DAY GENERALLY UNDER 8 KTS THEN SWING
AROUND TO THE SOUTHWEST LATER IN THE AFTERNOON AND BECOME GUSTY AT
TIMES. THUNDERSTORM OUTFLOW BOUNDARIES COULD CHANGE THIS THINKING
AND PROVIDE TWO TO THREE HOURS OF DIRECTIONAL SHIFTS WITH SOME
STRONGER GUSTS. SCATTERED HIGH CLOUDS THIS MORNING WITH MID LEVEL
CLOUDS AND CBS DEVELOPING LATE THIS MORNING INTO THE AFTERNOON.
ISOLATED TO SCATTERED STORMS ARE POSSIBLE IN AND AROUND THE VALLEY
TODAY.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE
TODAY WITH THE BEST CHANCE ACROSS SAN BERNARDINO AND MOHAVE
COUNTIES. MORE ISOLATED DEVELOPMENT WILL BE POSSIBLE FURTHER NORTH
INTO CLARK AND SOUTHERN NYE COUNTY. INYO AND ESMERALDA COUNTIES LOOK
TO HAVE LOWER CHANCES TODAY. GUSTY WINDS WILL BE POSSIBLE NEAR
STORMS....OTHERWISE AMBIENT WINDS WILL BE GENERALLY LIGHT WITH SOME
SOUTH TO SOUTHWEST GUSTINESS POSSIBLE LATE THIS AFTERNOON.
&&

.PREV DISCUSSION...
425 AM PDT SUN AUG 28 2011

.SHORT TERM...TODAY THROUGH TUESDAY...THE MAIN FEATURE WORTH NOTING
IS THE MESOSCALE CONVECTIVE VORTEX OVER LA PAZ COUNTY ARIZONA. THIS
WAS PRODUCED BY A MASSIVE DECAYING THUNDERSTORM COMPLEX SATURDAY
EVENING OVER SOUTHWEST ARIZONA. DOPPLER RADAR AND SURFACE
OBSERVATIONS REVEALED THAT THE OUTFLOW BOUNDARY FROM THIS COMPLEX
HAS PUSHED SOUTHERLY WINDS...SUSPENDED DUST AND DEWPOINTS IN THE
LOWER 60S UP INTO SOUTHERN CLARK COUNTY BETWEEN LAUGHLIN AND
SEARCHLIGHT AS OF 11Z. THIS BOUNDARY HAS BEEN LOSING MOMENTUM BUT
WILL SPREAD AT LEAST INTO CENTRAL CLARK COUNTY AND SHOULD BRING A
NOTICEABLE HAZE INTO THE LAS VEGAS VALLEY. REMNANT MID AND HIGH
LEVEL CLOUDS WILL BE DRAWN SLOWLY NORTHWARD AND SHOULD LIMIT
SUNSHINE SOMEWHAT THIS MORNING. THE MCV WILL LIKELY MOVE SLOWLY TO
THE NORTH AND BE A FOCUSING MECHANISM FOR CONVECTION. THE ADDITIONAL
SHOT OF LOW LEVEL MOISTURE SHOULD AID CONVECTION UP INTO SOUTHERN
NEVADA BUT SOMETIMES THESE OUTFLOW BOUNDARIES HAVE A LITTLE
STABILIZING EFFECT. IT WILL ALSO HOLD TEMPERATURES DOWN A FEW
DEGREES AND THE EXCESSIVE HEAT WARNING WAS CANCELLED TODAY. I KEPT
THUNDERSTORM COVERAGE IN THE ISOLATED TO SCATTERED RANGE AND
FORECAST SOUNDINGS INDICATE SLIGHTLY MORE STABLE CONDITIONS
TODAY...ESPECIALLY OVER THE WESTERN MOJAVE DESERT.
HOWEVER...TWENTYNINE PALMS AND BARSTOW COULD STILL SEE SOME
THUNDERSTORMS TODAY DUE TO THE LOW LEVEL MOISTURE STILL IN PLACE.
THE NAM AND GFS CONTINUE TO INDICATE DRIER WESTERLY FLOW DEVELOPING
MONDAY IN RESPONSE TO THE LOW OVER OREGON MOVING INTO IDAHO/MONTANA
AND THE HIGH CENTER SHIFTING OVER SOUTHEAST ARIZONA. THIS SHOULD
DECREASE THUNDERSTORM COVERAGE FROM WEST TO EAST AND ALLOW
TEMPERATURES TO REALIZE THEIR POTENTIAL WITH HIGHS CLIMBING BACK TO
NEAR RECORD LEVELS. THE DRYING TREND CONTINUES TUESDAY AS A TROUGH
DROPS INTO THE PACIFIC NORTHWEST AND PRODUCES A PREVAILING SOUTHWEST
FLOW AND SLIGHTLY LOWER TEMPERATURES ACROSS THE REGION.

.LONG TERM...AN UPPER TROUGH WILL MOVE INTO THE WEST COAST EARLY IN
THE WEEK AND MOVE THROUGH THE GREAT BASIN WEDNESDAY AND THURSDAY.
MODELS ARE IN BETTER AGREEMENT WITH THE TIMING AND STRENGTH OF THE
TROUGH AND IT LOOKS LIKE THERE WILL BE ENOUGH OF A SOUTHWEST FLOW TO
BRING DRIER AIR INTO THE REGION AND KEEP THUNDERSTORM CHANCES EAST
OF THE AREA. THIS WILL ALSO BRING SOMEWHAT COOLER TEMPERATURES BY
THE MIDDLE OF NEXT WEEK. BY FRIDAY THROUGH SUNDAY HIGH PRESSURE WILL
BUILD BACK TOWARD THE WEST WITH THE POTENTIAL OF MOISTURE INCREASING
ONCE AGAIN OVER THE EASTERN PORTIONS OF THE AREA ALONG WITH SLIGHTLY
INCREASING TEMPERATURES.

.AVIATION...FOR MCCARRAN...WINDS WILL BE LIGHT EXCEPT FOR OCCASIONAL
OUTFLOW BOUNDARIES PROVIDING TWO TO THREE HOURS OF DIRECTIONAL
SHIFTS WITH SOME GUSTINESS. SCT TO BKN DECK AT AROUND 15K MAY OPEN
UP ALLOWING FOR THE DEVELOPMENT OF ISOLATED TO SCATTERED STORMS IN
THE AFTERNOON. WIND SHIFTS NEAR THUNDERSTORMS WILL BE
POSSIBLE...AMBIENT WINDS WILL BE LIGHT FROM THE EAST SHIFTING TO THE
SOUTH TO SOUTHWEST WITH SOME GUSTINESS LATE IN THE DAY.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE
SUNDAY WITH THE BEST CHANCE ACROSS SAN BERNARDINO AND MOHAVE
COUNTIES. MORE ISOLATED DEVELOPMENT WILL BE POSSIBLE FURTHER NORTH
INTO CLARK AND SOUTHERN NYE COUNTY. INYO AND ESMERALDA COUNTIES LOOK
TO HAVE LOWER CHANCES TODAY. GUSTY WINDS WILL BE POSSIBLE NEAR
STORMS. AMBIENT WINDS WILL BE GENERALLY LIGHT WITH SOME SOUTH TO
SOUTHWEST GUSTINESS POSSIBLE LATE THIS AFTERNOON.

.CLIMATE...
HERE ARE THE RECORD HIGH MAXIMUM TEMPERATURES TODAY THROUGH MONDAY
FOR THE MAIN CLIMATE SITES AROUND OUR AREA..

LOCATION      TODAY       MONDAY

              8/28        8/29
-----------------------------------------------
LAS VEGAS     110/1944    110/1948
BISHOP        103/2001    105/1950
DAGGETT       111/1998    110/2009
DEATH VALLEY  123/1998    124/1998
NEEDLES       116/2009    117/2005
KINGMAN       107/2009    105/1915

AND THE RECORD HIGH MINIMUM TEMPERATURES FOR LAS VEGAS...

SUN 8/28...83/2008
MON 8/29...85/2009
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...EXCESSIVE HEAT WARNING FROM 11 AM TO 8 PM PDT MONDAY FOR NVZ016-
     017-020>022.
AZ...EXCESSIVE HEAT WARNING FROM 11 AM TO 8 PM MST MONDAY FOR AZZ002-
     003-036.
CA...EXCESSIVE HEAT WARNING FROM 11 AM TO 8 PM PDT MONDAY FOR
     CAZ522>527.
&&

MORGAN/SALMEN/ADAIR/GORELOW/GIBBS

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
612 AM PDT SUN AUG 28 2011

CAZ519>521-NVZ014-015-018-019-290700-
EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
ESMERALDA AND CENTRAL NYE COUNTY-LINCOLN COUNTY-SHEEP RANGE-
SPRING MOUNTAINS-
612 AM PDT SUN AUG 28 2011

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

.DAY ONE...TODAY AND TONIGHT

MOISTURE AND INSTABILITY WILL ONCE AGAIN RESULT IN ISOLATED TO
SCATTERED THUNDERSTORMS THIS AFTERNOON AND EVENING. LOCALLY HEAVY
RAIN AND FLASH FLOODING WOULD BE THE MAIN HAZARDOUS WEATHER THREAT
WITH A FEW STORMS OVER THE SPRING MOUNTAINS...SHEEP RANGE AND
LINCOLN COUNTY. LOCALIZED WIND GUSTS OVER 50 MPH WILL BE A
POTENTIAL HAZARD OVER INYO AND ESMERALDA COUNTIES.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.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.

AZZ001>003-036-CAZ522>527-NVZ016-017-020>022-290700-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-DEATH VALLEY NATIONAL PARK-
WESTERN MOJAVE DESERT-EASTERN MOJAVE DESERT-MORONGO BASIN-
CADIZ BASIN-SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-
NORTHEAST CLARK COUNTY-WESTERN CLARK AND SOUTHERN NYE COUNTY-
LAS VEGAS VALLEY-SOUTHERN CLARK COUNTY-
612 AM PDT SUN AUG 28 2011 /612 AM MST SUN AUG 28 2011/

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

.DAY ONE...TODAY AND TONIGHT

MOISTURE AND INSTABILITY WILL ONCE AGAIN RESULT IN ISOLATED TO
SCATTERED THUNDERSTORMS THIS AFTERNOON AND EVENING. LOCALLY HEAVY
DOWNPOURS COULD POSSIBLY TRIGGER ISOLATED FLASH FLOODING...ESPECIALLY
OVER SOUTHERN AND CENTRAL MOHAVE AND SOUTHEAST SAN BERNARDINO
COUNTIES. LOCALIZED WIND GUSTS OVER 50 MPH WILL ALSO BE A
POTENTIAL HAZARD WITH A FEW STORMS IN WESTERN SAN BERNARDINO AND
CLARK COUNTIES.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

DRIER CONDITIONS SPREADING ACROSS THE REGION MONDAY WILL ALLOW
TEMPERATURES TO REACH THEIR POTENTIAL WITH READINGS EXPECTED TO
AGAIN BE NEAR RECORD VALUES. AN EXCESSIVE HEAT WARNING IS IN
EFFECT FOR 11 AM TO 8 PM MONDAY FOR MUCH OF THE MOJAVE DESERT.
THUNDERSTORM COVERAGE WILL DECREASE WITH ISOLATED STORMS CONFINED
TO EASTERN LINCOLN AND MOHAVE COUNTIES. DRY AND STABLE CONDITIONS
ARE EXPECTED THE REST OF THE WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TODAY OVER SOUTHERN AND CENTRAL
MOHAVE COUNTY. SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT
WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

JA

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LAS VEGAS NV
1221 PM PDT SUN AUG 28 2011

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

0145 PM     HEAVY RAIN       4 NNE LANDERS (AR190)   34.27N 116.38W
08/27/2011  M1.00 INCH       SAN BERNARDINO     CA   TRAINED SPOTTER

            A SPOTTER REPORTED ONE INCH IN 30 MINUTES...PEA SIZE HAIL
            AND VISIBILITY DECREASING RAPIDLY FROM A THUNDERSTORM.

0300 PM     TSTM WND DMG     5 WNW BARSTOW           34.91N 117.15W
08/27/2011                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            5 POWER POLES WERE KNOCKED DOWN BY THUNDERSTORM WINDS
            ALONG COMMUNITY BOULEVARD BETWEEN SUMMERSET ROAD AND
            DIXIE ROAD.

0330 PM     TSTM WND GST     4 ESE WEST WIND AERO    34.12N 115.85W
08/27/2011  M73.00 MPH       SAN BERNARDINO     CA   TRAINED SPOTTER

            A SPOTTER REPORTED DAMAGE TO A SHED AND AN AWNING ON
            THEIR PROPERTY AS WELL AS LOOSE ITEMS BLOWN AROUND. A
            WIND GUST TO 64 MPH WAS ALSO MEASURED. THE THUNDERSTORM
            LASTED APPROXIMATELY 20 MINUTES.

0425 PM     FLASH FLOOD      2 ESE TWENTYNINE PALMS  34.17N 115.74W
08/27/2011                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            AROUND 6 INCHES OF WATER WAS REPORTED NEAR AMBOY ROAD AND
            LELIA LANE BY THE CALIFORNIA HIGHWAY PATROL.

0630 PM     FLASH FLOOD      18 SSE ORIENTAL WASH RA 37.00N 117.37W
08/27/2011                   INYO               CA   PARK/FOREST SRVC

            THE PARK SERVICE REPORTED DEBRIS ON SCOTTYS CASTLE ROAD
            DUE TO FLASH FLOODING.

0730 PM     FLASH FLOOD      4 NNW FURNACE CREEK     36.50N 116.88W
08/27/2011                   INYO               CA   PARK/FOREST SRVC

            THE PARK SERVICE REPORTED MUD AND ROCKS WERE WASHED ONTO
            HIGHWAY 190 NEAR COW CREEK BY FLOODWATERS.

&&
THIS IS AN UPDATED SUMMARY OF REPORTS FROM ACROSS THE MOJAVE DESERT
FROM THUNDERSTORM ACTIVITY ON SATURDAY. THIS INCLUDES SEVERAL DELAYED
REPORTS.

STACHELSKI