Severe Thunderstorm Warning 2, NWS Las Vegas, NV

000 
WWUS55 KVEF 202219
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
316 PM MST WED FEB 20 2008

AZC015-202230-
/O.CON.KVEF.SV.W.0002.000000T0000Z-080220T2230Z/
MOHAVE AZ-
316 PM MST WED FEB 20 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MST
FOR NORTHEASTERN MOHAVE COUNTY...

AT 312 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED 
TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE 
HAIL. THIS STORM WAS LOCATED IN COLORADO CITY...MOVING NORTHEAST AT 
20 MPH. 

LAT...LON 3700 11301 3699 11268 3675 11302 3694 11318
TIME...MOT...LOC 2216Z 233DEG 21KT 3701 11283

$$

SC

000 
WWUS55 KVEF 202228
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
326 PM MST WED FEB 20 2008

AZC015-202236-
/O.CAN.KVEF.SV.W.0002.000000T0000Z-080220T2230Z/
MOHAVE AZ-
326 PM MST WED FEB 20 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MOHAVE COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS OUT OF NORTHEASTERN MOHAVE COUNTY AND INTO
SOUTHWEST UTAH AND THEREFORE THE SEVERE THUNDERSTORM WARNING FOR 
NORTHEASTERN MOHAVE COUNTY IS CANCELLED.

LAT...LON 3700 11301 3699 11268 3675 11302 3694 11318
TIME...MOT...LOC 2226Z 233DEG 21KT 3704 11277

$$

SC

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE LAS VEGAS NV
1113 AM PST WED FEB 20 2008

.SYNOPSIS...A FAST MOVING PACIFIC STORM WILL MOVE THROUGH SOUTHERN
CALIFORNIA AND SOUTHERN NEVADA TODAY...BRINGING SCATTERED SHOWERS
AND A SLIGHT CHANCE OF THUNDERSTORMS TO THE AREA. THE SYSTEM WILL
EXIT ACROSS ARIZONA TONIGHT...BUT THE WEATHER PATTERN WILL REMAIN
UNSETTLED THROUGH THE WEEKEND...AS TWO MORE PACIFIC STORMS SWING
INTO THE WEST FRIDAY AND SUNDAY. HIGH PRESSURE IS EXPECTED TO BUILD
OVER THE DESERT SOUTHWEST EARLY NEXT WEEK...BRINGING DRIER AND
WARMER WEATHER.
&&

.UPDATE...SURFACE GRADIENTS HAVE INCREASED SLIGHTLY MORE THAN
EXPECTED EARLIER WITH WINDS ACROSS THE WESTERN PORTION OF SAN
BERNARDINO COUNTY LIKELY HITTING ADVISORY LEVELS THROUGH THE
AFTERNOON. WILL UPDATE ZONES TO SHOW WIND ADVISORY FOR THIS AREA AND
TO REMOVE MORNING WORDING.
&&

.PREV UPDATE 936 AM PST ...UPPER LOW OVER CENTRAL CALIFORNIA TO
SHIFT TO SOUTHERN NEVADA BY 00Z BEFORE EXITING TO THE EAST
OVERNIGHT. COLD POOL ALOFT TO SHIFT WITH THE LOW WITH RESULTANT
INSTABILITY INCREASING ACROSS THE CWA DURING THE DAY AND INTO THIS
EVENING FOR CONTINUED MENTION OF SHOWERS AND THUNDERSTORMS. SURFACE
GRADIENTS/FLOW ALOFT TO ALSO KEEP POSSIBLE WINDS ACROSS MAINLY SAN
BERNARDINO COUNTY THROUGH THE DAY AND WILL MONITOR BUT AT THIS TIME
APPEARS STRONGEST WINDS WILL BE TO THE SOUTH OF THE CWA. OVERALL
CURRENT SHORT TERM FORECAST ON TRACK. NO UPDATES PLANNED ATTM. &&

.AVIATION...FOR MCCARRAN...KLAS WILL GO SCT TO FEW CLOUDS THIS
MORNING BUT WILL CLOUD UP AGAIN THIS AFTERNOON AS THE MAIN STORM
SYSTEM PASSES OVER SOUTHERN NEVADA. THIS WILL BRING BACK CEILINGS
AROUND 6000 FT AND A 50 PERCENT CHANCE OF RAIN AT THE TERMINAL.
THUNDERSTORMS ARE STILL A POTENTIAL EVENT IN THE VALLEY...BUT NOT A
BIG ENOUGH THREAT TO PUT IN 18Z TAF. THE DAGGETT AND PEACH SPRINGS
CORRIDORS COULD HAVE THEM THOUGH THIS AFTERNOON AND AREAS SOUTH OF
THE VALLEY WILL HAVE A BETTER CHANCE. THE SYSTEM SHOULD BE THROUGH
THE AREA AREA LATE THIS EVENING AT WHICH TIME KLAS WILL LOOSE IT
CEILINGS.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...A WEAK SYSTEM EXITING THE REGION THIS MORNING WITH CIGS
GENERALLY ABOVE 9K FEET ACROSS THE REGION. A SECOND SYSTEM WILL MOVE
INTO THE REGION THIS AFTERNOON WITH CIGS FALLING TO AROUND 6-8K FEET
OVER MOST LOCATIONS. ISOLATED TO SCATTERED SHOWERS WILL OCCUR TODAY
AND EARLY THIS EVENING WITH THE SIERRA RECEIVING THE MORE WIDESPREAD
RAIN AND SNOW SHOWERS ALONG WITH CIGS BELOW 4K FEET. ISOLATED
THUNDERSTORMS WILL BE POSSIBLE BETWEEN 21Z-02Z THIS AFTERNOON OVER
SOUTHERN SAN BERNARDINO...SOUTHERN CLARK AND SOUTHERN MOHAVE
COUNTIES. GENERALLY LIGHT WINDS THIS MORNING WITH THE EXCEPTION OF
THE SAN BERNARDINO COUNTY DESERTS WHERE WEST WINDS 15-25 KNOTS WILL
OCCUR. MOST AREAS WILL SEE AN INCREASE IN SOUTHWEST WINDS AFTER 20Z
IN THE 8-12 KNOT RANGE.
&&

.PREV DISCUSSION...239 AM PST SHORT TERM...SATELLITE SHOWS MAIN
STORM SYSTEM JUST OFFSHORE OF NORTHERN CALIFORNIA EARLY THIS
MORNING...WITH A SMALLER CIRCULATION EXITING NORTHERN MOHAVE COUNTY
TO THE NORTHEAST. THIS SMALLER CIRCULATION WAS RESPONSIBLE FOR
SPRINKLES IN THE LAS VEGAS AREA AS IT MOVED THROUGH BEFORE
MIDNIGHT...AND RADAR SHOWED WEAK RETURNS CONTINUING OVER MOHAVE
COUNTY AT THIS TIME. THE LOW LEVELS REMAIN QUITE DRY...SO ANY PRECIP
THIS MORNING SHOULD BE LIMITED TO A COUPLE HUNDREDTHS OF AN INCH OR
LESS. BETWEEN THE TWO CIRCULATION CENTERS IS A LARGE DRY SLOT WHICH
COVERED MOST OF INYO AND SAN BERNARDINO COUNTIES AND WAS WORKING
INTO SOUTHERN NEVADA AS OF 2 AM. THIS WILL MAKE THINGS TRICKY THIS
MORNING...WITH THE MAIN QUESTIONS BEING HOW MUCH SUNSHINE WILL WE
SEE THIS MORNING AND HOW WILL THAT AFFECT THE HIGH TEMPS. PLAYED IT
PRETTY CLOSE TO MOS FOR NOW...BUT DAY SHIFT WILL NEED TO
MONITOR...BECAUSE IF WE GET A FEW HOURS OF NEARLY FULL SUN WE WILL
EXCEED THE FORECAST HIGH. THE MAIN STORM WILL TRAVERSE OUR AREA
DURING THE AFTERNOON AND EVENING...AND THE MENTION OF THUNDER STILL
LOOKS GOOD WITH THE COLD CORE OVERHEAD AND STRONG DYNAMIC FORCING AS
WELL. WINDS WILL INCREASE OVER SAN BERNARDINO COUNTY THIS
AFTERNOON...WITH THE STRONGEST GUSTS LIKELY NEAR BARSTOW
/TERRAIN FUNNELING/ AND NEAR VIDAL JUNCTION /NEAREST THE BEST MID
LEVEL SUPPORT/. KEPT THE FORECAST JUST BELOW WIND ADVISORY CRITERIA.
THE MAIN STORM WILL EXIT STAGE RIGHT TONIGHT...WITH A BRIEF PERIOD
OF SHORTWAVE RIDGING ON THURSDAY BEFORE THE NEXT CAR IN THE STORM
TRAIN SLAMS INTO OREGON AND NORTHERN CALIFORNIA THURSDAY EVENING.
MODELS HAVE BEEN TRENDING A LITTLE FARTHER NORTH WITH THAT
ONE...WHICH COULD MAKE FRIDAY MORE OF A WIND DAY THAN A PRECIP DAY
FOR US. DID NOT CHANGE TOO MUCH FOR NOW...BUT WILL NEED TO DO SO IF
THE TREND CONTINUES.

.LONG TERM...NOT MUCH CHANGE IN THE OVERALL EXTENDED PERIOD AS THE
EASTERN AREAS OF THE CWA WILL STILL BE UNDER THE INFLUENCE OF A
SHORTWAVE TROUGH THROUGH MIDDAY SATURDAY. STILL LEFT A FEW RESIDUAL
SHOWERS OVER PORTIONS OF LINCOLN AND MOHAVE COUNTIES...BUT IT LOOKS
LIKE THE PRECIPITATION WILL BE OVER BY NOON. WEAK SHORTWAVE RIDGING
WILL MOVE OVER THE AREA SATURDAY AFTERNOON WITH MOST LOCATIONS
EXPERIENCING DRY CONDITIONS. BOTH THE GFS AND ECMWF DIFFER SLIGHTLY
WITH SUNDAYS SYSTEM. THE GFS IS ABOUT 100 METERS DEEPER AND FURTHER
SOUTH THAN THE ECMWF WITH BOTH MODELS SHOWING GOOD AMOUNTS OF QPF
REACHING THE COAST. STILL THINK THAT THE MAJORITY OF THE PRECIP WILL
BE INTERCEPTED BY THE SIERRA AND THE GREATEST CHANCE OF
PRECIPITATION WILL OCCUR OVER THE WESTERN AND NORTHERN AREAS OF THE
CWA...ALTHOUGH WILL KEEP THE CURRENT POPS UNCHANGED WITH SLIGHT
CHANCES OVER THE SOUTHERN CWA. ALSO LOOK FOR INCREASED WINDS LATE
SATURDAY NIGHT AND SUNDAY WITH MOST LOCATIONS EXPERIENCING BREEZY
CONDITIONS. TEMPERATURES WILL COOL TO SLIGHTLY BELOW NORMAL READINGS
SATURDAY AND SUNDAY DUE TO THE LOWERING HEIGHTS AND SOLID CLOUD
COVER. HIGH PRESSURE FORECAST TO BUILD OVER THE AREA MONDAY THROUGH
WEDNESDAY WITH A GRADUAL WARMING TREND AND DRY CONDITIONS.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...NONE.
AZ...NONE.
CA...WIND ADVISORY IN EFFECT UNTIL 7 PM FOR CA523.
&&

JENSEN/JACQUES/MORGAN/GORELOW

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
244 AM PST WED FEB 20 2008

AZZ001>003-036-CAZ519>527-NVZ014>022-210800-
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-
244 AM PST WED FEB 20 2008 /344 AM MST WED FEB 20 2008/

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

.DAY ONE...TODAY AND TONIGHT

A PACIFIC STORM SYSTEM WILL CROSS THE AREA TODAY AND TONIGHT. THIS
STORM WILL BRING CHANCES FOR SHOWERS...THUNDERSTORMS AND MOUNTAIN
SNOW TO MOST AREAS...ALONG WITH GUSTY WINDS OVER PARTS OF SAN
BERNARDINO COUNTY. WIDESPREAD HAZARDOUS WEATHER IS NOT LIKELY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

TWO MORE STORM SYSTEMS WILL AFFECT THE REGION DURING THIS
PERIOD...MOST LIKELY ON FRIDAY AND SUNDAY. THESE STORMS WILL ALSO
BRING CHANCES FOR MOUNTAIN SNOW AND VALLEY RAIN ALONG WITH GUSTY
WINDS. WIDESPREAD HAZARDOUS WEATHER IS NOT LIKELY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED...BUT SPOTTERS ARE
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD
OPERATING PROCEDURES.

MORGAN