Severe Thunderstorm Warning 11, NWS Las Vegas, NV

623 
WWUS55 KVEF 151937
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1237 PM PDT TUE JUL 15 2014

NVC003-152000-
/O.CON.KVEF.SV.W.0011.000000T0000Z-140715T2000Z/
CLARK NV-
1237 PM PDT TUE JUL 15 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM PDT
FOR EAST CENTRAL CLARK COUNTY...

AT 1236 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM. THIS STORM WAS LOCATED 11 MILES EAST 
OF OVERTON BEACH...OR 16 MILES EAST OF OVERTON. THIS STORM WAS NEARLY
STATIONARY. OUTFLOW WINDS PUSHING FROM EAST TO WEST WILL SPREAD 
ACROSS THE OVERTON EXTENSION OF LAKE MEAD.

LOCATIONS IMPACTED INCLUDE...
OVERTON AND OVERTON BEACH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM WILL AFFECT THE OVERTON EXTENSION OF LAKE MEAD. IF OUT IN 
OPEN WATERS...HEAD TO SHORE IF THERE IS TIME...OTHERWISE DROP ANCHOR 
AND TAKE COVER IN THE BOAT CABIN. STAY AWAY FROM METAL AND ALL 
ELECTRICAL COMPONENTS. LIGHTNING KILLS!

&&

LAT...LON 3634 11448 3660 11446 3657 11406 3637 11406
TIME...MOT...LOC 1935Z 097DEG 2KT 3647 11417

$$

278 
WWUS55 KVEF 151954
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1254 PM PDT TUE JUL 15 2014

NVC003-152002-
/O.EXP.KVEF.SV.W.0011.000000T0000Z-140715T2000Z/
CLARK NV-
1254 PM PDT TUE JUL 15 2014

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CLARK COUNTY HAS
EXPIRED...

THE STORM THAT PROMPTED THE WARNING HAS DROPPED BELOW SEVERE LIMITS 
AND IS NOT LONGER A MAJOR THREAT TO THE GENERAL PUBLIC.

LAT...LON 3634 11448 3660 11446 3657 11406 3637 11406
TIME...MOT...LOC 1952Z 097DEG 2KT 3647 11418

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
932 AM PDT TUE JUL 15 2014

.SYNOPSIS...A MOIST SOUTHEAST FLOW COMBINED WITH A DISTURBANCE ALOFT
WILL PROVIDE A MORE ACTIVE DAY FOR SHOWERS AND THUNDERSTORMS ACROSS
MUCH OF THE REGION TODAY. DRIER AND MORE STABLE AIR WILL GRADUALLY
SPREAD FROM SOUTH TO NORTH TONIGHT THROUGH THURSDAY LEADING TO LESS
THUNDERSTORM DEVELOPMENT THE SECOND HALF OF THE WEEK.
&&

.UPDATE...SHORTWAVE MOVING NORTHWEST INTO THE FORECAST AREA WAS
GENERATING A NICE BAND OF SHOWERS AND THUNDERSTORMS ACROSS CENTRAL
MOHAVE COUNTY THIS MORNING WITH SOME PRETTY HEAVY RAINFALL. LATEST
HRR MODEL IS INDICATING GOOD POTENTIAL FOR HEAVY RAIN ACROSS THAT
AREA NORTHWARD INTO NORTHERN MOHAVE COUNTY AND EVEN LINCOLN COUNTY
AS THE SHORTWAVE TRACKS TO THE NORTH. I DECIDED TO ISSUE A FLASH
FLOOD WATCH FOR THOSE AREAS VALID UNTIL 10 PM THIS EVENING. IT WILL
PROBABLY SHUT DOWN MUCH EARLIER IN SOUTHERN/CENTRAL MOHAVE COUNTY
BUT I DID NOT WANT TO ADD ANY CONFUSION BY SEGMENTING THE PRODUCT.
POP/WX/QPF GRIDS WERE ALL UPDATED ACCORDINGLY. -HARRISON-

.PREV DISCUSSION...
400 AM PDT TUE JUL 15 2014

.SHORT TERM...TODAY THROUGH THURSDAY NIGHT...FAIRLY WELL DEFINED
BANDS OF SHOWERS AND BRIEF THUNDERSTORMS HAVE BEEN DEVELOPING SINCE
08Z ACROSS MOHAVE AND CLARK COUNTIES AND RECENT RADAR TRENDS
INDICATE INCREASING COVERAGE THROUGH EARLY THIS MORNING. IT APPEARS
THESE BANDS ARE FORMING IN A FAVORABLE AREA OF MID LEVEL CONVERGENCE
WITH AN APPARENT SECONDARY WAVE LIFTING ACROSS THE MOJAVE DESERT
REGION. SOUTHERN NEVADA IS ALSO UNDER THE 250 MB ANTICYCLONIC CENTER
WITH JET LEVEL WINDS AROUND 5 KTS OR LESS. CONVECTION SHOULD BE MORE
ACTIVE OVER SOUTHERN NEVADA THIS MORNING THEN BECOME MORE FOCUSED
OVER THE SOUTHERN SIERRA AND SOUTHERN GREAT BASIN DURING THE
AFTERNOON. STORMS WILL BE MOVING TO THE WEST-NORTHWEST THIS MORNING
THEN SHOULD TRANSITION TO A NORTHWARD MOVEMENT THIS AFTERNOON.

IT LOOKS LIKE TODAY SHOULD BE THE MOST ACTIVE FOR THUNDERSTORMS
FOLLOWED BY A DOWNWARD TREND IN COVERAGE WEDNESDAY AND THURSDAY. DRY
AND MORE STABLE AIR SPREADING FROM NORTHERN BAJA UP INTO SOUTHERN
SAN BERNARDINO COUNTY TODAY WILL LIMIT CONVECTION AND THIS AIR MASS
WILL SLOWLY SPREAD OVER SOUTHERN NEVADA TONIGHT AND WEDNESDAY WHICH
WILL DIMINISH CHANCES FOR THUNDERSTORMS WEDNESDAY FROM LAS VEGAS
SOUTHWARD. A BAND OF MOISTURE AND INSTABILITY IS FORECAST TO EXTEND
FROM NORTHERN INYO COUNTY AND CENTRAL NEVADA DOWN TO NORTHWEST
ARIZONA WEDNESDAY THEN SLOWLY GIVE WAY TO THE DRIER AND MORE STABLE
AIR PUSHING UP FROM THE SOUTH THURSDAY FOR DECREASING CONVECTION.

TEMPERATURES WILL GENERALLY NUDGE UPWARD A FEW DEGREES WEDNESDAY AND
THURSDAY UNDER DRIER AIR AND LESS CLOUD COVER WITH READINGS NEAR
NORMAL.

.LONG TERM...FRIDAY THROUGH TUESDAY...WITH THE EXCEPTION OF SATURDAY
THE MODELS KEEP MUCH OF THE AREA DRY WITH ONLY THE NORTHERN PORTIONS
OF THE FORECAST AREA SEEING THUNDERSTORMS THROUGH THE EXTENDED
PERIOD. ON SATURDAY...WITH BOTH MODELS SHOWING HIGH PRESSURE TO
SLOWLY WORK EAST AND SET UP OVER NEW MEXICO THE FLOW WILL START TO
BECOME MORE SOUTHERLY...HOWEVER A TROUGH DIGGING OFF THE WEST COAST
WILL BE A FACTOR IN DETERMINING HOW MUCH MOISTURE WORKS NORTH AROUND
THE HIGH. THE ECMWF SHOWS THIS TROUGH TO DIG A LITTLE FURTHER SOUTH
THEN THE GFS WHICH WILL ALLOW FOR MORE OF A SOUTHWEST FLOW AND KEEP
MUCH OF THE MOISTURE IN ARIZONA AND NOT ALLOWING MUCH OF A NORTHERN
PROGRESSION. THE GFS IS SHOWING THAT MOISTURE AND INSTABILITY
SATURDAY STREAMING NORTHWARD WHICH COULD BRING A BETTER CHANCE OF
SHOWERS AND THUNDERSTORMS TO THE EASTERN HALF OF THE CWA.
HOWEVER...BASED ON PREVIOUS FORECAST WILL CONTINUE TO LEAD WITH THE
ECMWF AND KEEP A GENERAL DRY FORECAST WITH ONLY SLIGHT CHANCES OF
THUNDERSTORMS...MAINLY ACROSS THE NORTH. TEMPERATURES ARE EXPECTED
TO REMAIN FAIRLY CLOSE TO SEASONAL NORMS THROUGH THE PERIOD.
&&

.AVIATION...FOR MCCARRAN...BANDS OF SHOWERS AND THUNDERSTORMS OVER
CENTRAL CLARK COUNTY EARLY THIS MORNING WILL TRACK TOWARD THE
WEST-NORTHWEST AND SHOULD BE OUT OF THE TERMINAL AREA BY 15Z.
SCT-BKN CLOUDS OF 6-7KFT SHOULD LIFT BY THEN. LOOK FOR A PREVAILING
SOUTH TO SOUTHEAST WINDS OF 6-11 KTS MUCH OF TODAY. ISOLATED TO
SCATTERED THUNDERSTORMS SHOULD DEVELOP IN THE BEATTY...MORMON MESA
AND PEACH SPRINGS CORRIDORS THIS AFTERNOON. DRIER AND MORE STABLE
AIR WILL SPREAD OVER SOUTHERN NEVADA TONIGHT AND WEDNESDAY WITH
PREVAILING SOUTH-SOUTHWEST WINDS.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS OVER
SOUTHERN NEVADA THIS MORNING WILL BECOME MORE DEVELOPED OVER THE
AREA FROM THE SOUTHERN SIERRA ACROSS SOUTH CENTRAL NEVADA AND FAR
NORTHWEST ARIZONA DURING THE AFTERNOON. MORE STABLE AIR WILL SPREAD
IN OVER SOUTHEAST CALIFORNIA DURING THE DAY. LOCALIZED GUSTS AROUND
45 KTS CAN BE EXPECTED NEAR ANY STORMS. PREVAILING WINDS WILL BE
FROM THE SOUTH AT 5-15 KTS OUTSIDE OF STORM INFLUENCES.
&&

.SPOTTER INFORMATION STATEMENT...SPOTTER ACTIVATION IS POSSIBLE
TODAY. MEANWHILE...SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT
WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
&&

SHORT TERM/AVIATION...ADAIR
LONG TERM...GORELOW

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