Severe Thunderstorm Warning 109, NWS Las Vegas, NV

353 
WWUS55 KVEF 292227
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
327 PM PDT FRI JUL 29 2011

CAC027-292245-
/O.CON.KVEF.SV.W.0109.000000T0000Z-110729T2245Z/
INYO CA-
327 PM PDT FRI JUL 29 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM PDT
FOR NORTHWESTERN INYO COUNTY...

AT 318 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BIG TREES 
CAMPGROUND...OR 6 MILES NORTHEAST OF ASPENDELL...AND WAS NEARLY 
STATIONARY.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

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 3724 11866 3727 11868 3738 11858 3730 11833
      3711 11858 3713 11860 3713 11864 3714 11866
      3717 11865 3719 11867 3720 11866 3721 11868
TIME...MOT...LOC 2227Z 215DEG 15KT 3734 11849

$$

STACHELSKI

496 
WWUS55 KVEF 292241
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
341 PM PDT FRI JUL 29 2011

CAC027-292250-
/O.EXP.KVEF.SV.W.0109.000000T0000Z-110729T2245Z/
INYO CA-
341 PM PDT FRI JUL 29 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN INYO COUNTY WILL
EXPIRE AT 345 PM PDT...

THUNDERSTORMS OVER THE EASTERN SIERRA NEAR LAKE SABRINA HAVE 
WEAKENED TO BELOW SEVERE LEVELS AT THIS TIME. THEREFORE THE SEVERE 
THUNDERSTORM WARNING FOR THIS AREA WILL BE ALLOWED TO EXPIRE.

LAT...LON 3724 11866 3727 11868 3738 11858 3730 11833
      3711 11858 3713 11860 3713 11864 3714 11866
      3717 11865 3719 11867 3720 11866 3721 11868
TIME...MOT...LOC 2240Z 215DEG 15KT 3738 11845

$$

STACHELSKI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
1015 AM PDT FRI JUL 29 2011

.SYNOPSIS...MOISTURE WILL SPREAD NORTH AND WEST THROUGH THE
WEEKEND...WITH CHANCES FOR SHOWERS AND THUNDERSTORMS INCREASING IN
PROBABILITY AND COVERAGE EACH DAY. DRIER AIR WILL BEGIN TO SPREAD
INTO CALIFORNIA MONDAY AND WORK EAST BY MID-WEEK...LIMITING
THUNDERSTORMS TO MAINLY MOHAVE COUNTY BY WEDNESDAY.
&&

.UPDATE...ELEVATED CONVECTION TURNED INTO SCATTERED THUNDERSTORMS
THIS MORNING OVER DEATH VALLEY AND SOUTHERN NYE COUNTY. THIS WAS
APPARENTLY DEVELOPING IN RESPONSE TO AN UPPER LEVEL DISTURBANCE
DEPICTED BY BOTH THE NAM AND GFS WHICH WAS MOVING WESTWARD ACROSS
SOUTHERN NEVADA. SHOWERS WERE ALSO MOVING INTO SOUTHEAST MOHAVE
COUNTY THIS MORNING. INYO...ESMERALDA...CENTRAL NYE AND MOHAVE
COUNTIES SHOULD SEE THE BEST COVERAGE OF THUNDERSTORMS THROUGH THIS
AFTERNOON. THE 12Z LAS VEGAS SOUNDING INDICATED MARGINAL INSTABILITY
WITH LIMITED CAPE BUT THE NAM BUFR SOUNDING SHOWS CAPE INCREASING TO
AROUND 600 J/KG BY THIS AFTERNOON. THE BAND OF CONVECTION OVER
MOHAVE COUNTY WILL BE MOVING TO THE NORTHWEST AND COULD ALSO ENHANCE
THUNDERSTORM DEVELOPMENT IN CLARK COUNTY THIS AFTERNOON. THE
FORECAST WILL BE UPDATED TO INCREASE POPS/WEATHER COVERAGE OVER THE
AFOREMENTIONED FAVORABLE AREAS AND EVEN.
&&

.AVIATION...FOR MCCARRAN...SOUTHEAST WINDS 6-8KTS CAN BE EXPECTED
THROUGH THIS AFTERNOON THEN BECOMING LIGHT SOUTHERLY AROUND 7KTS
THIS EVENING. ISOLATED THUNDERSTORMS ARE POSSIBLE IN THE MORMON MESA
AND PEACH SPRINGS CORRIDORS THIS AFTERNOON AND EVENING. ISOLATED
THUNDERSTORMS ARE ALSO POSSIBLE IN THE MOUNTAINS SURROUNDING THE
VALLEY...BUT WILL KEEP MENTION OUT OF TAF AND ONLY INCLUDE CB. TSRA
COULD CREATE GUSTY AND ERRATIC WINDS FROM ASSOCIATED OUTFLOW
BOUNDARIES.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...SOUTH TO SOUTHEAST WINDS 10KTS OR LESS FOR MUCH OF THE
AREA TODAY WITH THE EXCEPTION OF ANY THUNDERSTORM OUTFLOW BOUNDARIES
THAT MAY CAUSE ERRATIC AND GUSTY WINDS. ISOLATED SHRA AND TSRA WILL
BE POSSIBLE ACROSS MUCH OF THE AREA TODAY IN THE AFTERNOON AND
EVENING WITH THE BEST CHANCES ACROSS THE HIGHER ELEVATIONS AS WELL
AS IN MOHAVE COUNTY.
&&

.PREV DISCUSSION...
320 AM PDT FRI JUL 290 2011

.SHORT TERM...INVERTED TROUGH NEAR THE BIG BEND OF TEXAS MADE LAST
EVENING...CARRYING OVER INTO THIS MORNING BY FAR THE MOST ACTIVE I
HAVE SEEN THE 2011 MONSOON ACROSS NORTHERN MEXICO. EARLY
MORNING SATELLITE SHOWS AND EXTENSIVE DEBRIS SHIELD ENCOMPASSING
MUCH OF ARIZONA WITH CLOUDS TRYING TO EXPAND WESTWARD INTO MOHAVE
COUNTY AND SOUTHEAST CALIFORNIA. UNFORTUNATELY FOR US...DYNAMICS
ASSOCIATED WITH INVERTED TROUGH WILL STAY TO OUR EAST AS FEATURE
SLOWLY MOVES NORTHWARD ACROSS WESTERN NEW MEXICO AND EASTERN ARIZONA
TODAY THROUGH SUNDAY. STRONG HIGH PRESSURE CENTER REMAINS POSITIONED
OVER THE SOUTHERN HIGH PLAINS MID-LEVELS WILL CONTINUE TO MOISTEN
UNDER PREVAILING SOUTHEAST FLOW. NAM BUFR SOUNDING FOR LAS VEGAS
PROGS PW VALUES NEAR 1.30 INCHES THIS AFTERNOON...INCREASING TO
AROUND 1.50 INCHES SATURDAY AND SUNDAY. SLOW STORM MOTION AND WELL
ABOVE NORMAL PW VALUES SUGGEST ANY THUNDERSTORM OVER THE WEEKEND HAS
THE POTENTIAL OF PRODUCING HEAVY RAIN. NOCTURNAL THUNDERSTORMS NOT
OUT OF QUESTION THIS WEEKEND ESPECIALLY IF THERE IS A DISTURBANCE
EMBEDDED IN THE FLOW. THE CLOUDINESS AND INCREASE IN SURFACE
DEWPOINTS WILL LEAD TO BELOW NORMAL TEMPERATURES OVER THE
WEEKEND...WHICH COMES ALONG WITH THAT UNCOMFORTABLE FEEL OF HIGHER
HUMIDITY VALUES.

.LONG TERM...UPPER LEVEL TROUGH APPROACHING THE WEST COAST MONDAY
WILL START TO BRING DRYER AIR INTO THE REGION AND HELP PUSH THE
MONSOONAL MOISTURE FURTHER EAST. MONDAY STILL LOOKS LIKE A FAIRLY
ACTIVE DAY OVER THE EASTERN THIRD OF THE AREA AS DEEPER MOISTURE
REMAINS IN PLACE. ANOTHER FACTOR WILL BE TROPICAL SYSTEM DON THAT IS
CURRENTLY OVER THE WESTERN GULF OF MEXICO. MODELS AND NHC ARE TAKING
THIS TRACK A BIT FURTHER SOUTH THAN 24HRS AGO AND TRACK THE
REMAINING MOISTURE ACROSS NORTHERN MEXICO. ITS POSSIBLE THAT THIS
MOISTURE COULD GET CAUGHT UP IN THE FLOW AND ADD ADDITIONAL MOISTURE
TO THE EASTERN AREAS OF THE CWA. THIS WOULD LIKELY OCCUR MONDAY OR
TUESDAY SO THIS WILL NEED TO BE WATCHED. TROUGH IS FORECAST TO
CONTINUE TO DIG NEXT WEDNESDAY THROUGH FRIDAY PUSHING MUCH OF THE
MOISTURE EAST AND LEAVING ONLY THE EASTERN HALF OF MOHAVE COUNTY IN
THE THUNDERSTORM THREAT. SOUTHWEST FLOW IS EXPECTED OVER THE
REMAINDER OF THE AREA WITH DRY CONDITIONS. TEMPERATURES WILL REMAIN
CLOSE TO OR SLIGHTLY BELOW NORMAL THROUGH THE WEEK.
&&

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

UPDATE...ADAIR
AVIATION...STACHELSKI
PREV DISCUSSION...PIERCE/GORELOW

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
504 AM PDT FRI JUL 29 2011

AZZ001>003-036-CAZ519>527-NVZ014>022-301000-
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-
504 AM PDT FRI JUL 29 2011 /504 AM MST FRI JUL 29 2011/

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

.DAY ONE...TODAY AND TONIGHT

ISOLATED SHOWERS AND THUNDERSTORMS WILL OCCUR AS MONSOON MOISTURE
INCREASES FROM THE SOUTHEAST. THE THREAT FOR HAZARDOUS WEATHER IS
LOW.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE THREAT OF HAZARDOUS WEATHER INCREASES SATURDAY THROUGH MONDAY
AS THERE IS A HIGHER PROBABILITY OF SHOWERS AND THUNDERSTORMS.
THERE WILL BE A GREATER THREAT OF FLASH FLOODING FROM HEAVY
RAINFALL. STORMS WILL ALSO PRODUCE GUSTY WINDS WHICH COULD CATCH
SOME BOATERS OFF GUARD ON AREA LAKES AS WELL AS DANGEROUS
LIGHTNING. THE HIGHER HUMIDITY VALUES WILL LEAD TO A FEELING OF
GREATER DISCOMFORT.

DRIER AIR MOVING INTO CALIFORNIA EARLY IN THE WEEK WILL
EVENTUALLY LIMIT ANY THUNDERSTORMS TO MOHAVE COUNTY BY THE MIDDLE
OF 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.