Flash Flood Warning 24, NWS Las Vegas, NV

463 
WGUS75 KVEF 232113
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
213 PM PDT SUN AUG 23 2009

CAC071-232215-
/O.CON.KVEF.FF.W.0024.000000T0000Z-090823T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
213 PM PDT SUN AUG 23 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM PDT FOR
CENTRAL SAN BERNARDINO COUNTY...

AT 206 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE WARNED 
AREA. THE HEAVIEST RAINS CONTINUE OVER THE MID HILLS AND NEW YORK 
MOUNTAINS EAST OF CIMA. RUNOFF FROM THE THUNDERSTORMS COULD CONTINUE 
TO FLOOD THE BRYANT-CIMA ROAD NEAR CIMA AND BRANT.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CIMA AND
NIPTON



PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 3549 11527 3536 11509 3495 11557 3500 11574

$$

JACQUES

412 
WGUS75 KVEF 232214
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
314 PM PDT SUN AUG 23 2009

CAC071-232219-
/O.EXP.KVEF.FF.W.0024.000000T0000Z-090823T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
314 PM PDT SUN AUG 23 2009

...THE FLASH FLOOD WARNING WILL EXPIRE AT 315 PM PDT FOR CENTRAL SAN
BERNARDINO COUNTY...

THE THUNDERSTORMS OVER THE AREA HAVE DECREASED IN INTENSITY AND THE 
RAINFALL HAS DECREASED AS WELL. THE THREAT FOR FLASH FLOODING IS 
OVER BUT WATER MAY STILL COVER ROADS IN THE AREA AND WASHES AND 
RAVINES MAY STILL BE RUNNING FULL.

LAT...LON 3549 11527 3536 11509 3495 11557 3500 11574

$$

JACQUES

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
950 AM PDT SUN AUG 23 2009

.SYNOPSIS...A TROUGH OF LOW PRESSURE WILL MOVE INLAND TODAY
BRINGING SCATTERED SHOWERS AND THUNDERSTORMS...WHICH WILL LINGER
INTO MONDAY. TEMPERATURES WILL REMAIN BELOW NORMAL THROUGH
MONDAY...THEN A DRYING AND WARMING TREND IS EXPECTED FOR TUESDAY
THROUGH THE END OF THE WEEK.
&&

.UPDATE...GEARING UP FOR POTENTIAL SEVERE WEATHER TODAY. CURRENT
FORECAST HAS THAT COVERED AND NO UPDATE PLANNED.
&&

.AVIATION...FOR MCCARRAN...MOSTLY SUNNY SKIES THIS MORNING BECOMING
PARTLY CLOUDY THIS AFTERNOON AS THUNDERSTORMS FORM OVER THE LOCAL
MOUNTAINS. VALLEY THUNDERSTORMS BECOME A POSSIBILITY THIS AFTERNOON
AND EVENING. CURRENT LIGHT WINDS WILL BECOME SOUTHEAST IN THE LATE
MORNING AND THEN SOUTH TO SOUTHWEST THIS AFTERNOON AROUND 10 TO
15KTS EXCEPT NEAR THUNDERSTORMS AND OUTFLOW BOUNDARIES.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...MOSTLY CLEAR SKIES SOUTH WITH PARTLY CLOUDY CONDITIONS
NORTH THIS MORNING. INCREASING CLOUD COVER AND THUNDERSTORM ACTIVITY
BEGINNING OVER THE HIGHER TERRAIN BY EARLY AFTERNOON AND THEN IN THE
VALLEY LOCATIONS LATE AFTERNOON AND EVENING. WINDS GENERALLY WILL BE
UNDER 10KTS BUT ERRATIC AND GUSTY NEAR THUNDERSTORMS AND OUTFLOW
BOUNDARIES.
&&

.PREV DISCUSSION...
308 AM PDT SUN AUG 23 2009

.SHORT TERM...SKIES HAD CLEARED OUT ACROSS THE SOUTHERN ZONES EARLY
THIS MORNING WHILE CLOUDS AND LIGHT SHOWERS ASSOCIATED WITH AN
EXITING SHORTWAVE WERE MOVING ACROSS THE NORTH. THE TROUGH THAT HAS
BEEN OFFSHORE WILL MOVE INLAND TODAY AND WILL COMBINE WITH LEFT OVER
MOISTURE AND MORNING SUNSHINE TO GENERATE SCATTERED TO NUMEROUS
THUNDERSTORMS THIS AFTERNOON AND EVENING. MODEL SOUNDINGS INDICATE
THE POTENTIAL FOR ISOLATED SEVERE THUNDERSTORMS ACROSS PORTIONS OF
SAN BERNARDINO...CLARK AND MOHAVE COUNTIES WITH LIFTED INDEX VALUES
AROUND -6 AND POSITIVE BUOYANT ENERGY 1500 TO 2000 JOULES. IN
ADDITION A JET MAX WILL BE MOVING INTO THE AREA PROVIDING LIFT AND
SHEAR. THE TROUGH WILL BE SLOW TO MOVE EAST AND WILL STILL BE IN THE
AREA MONDAY WITH A CHANCE OF THUNDERSTORMS OVER MOST OF THE AREA
EXCEPT WESTERN SAN BERNARDINO COUNTY. A DRIER AND MORE STABLE AIR
MASS WILL START TO MOVE IN TUESDAY BEHIND THE TROUGH WITH ISOLATED
THUNDERSTORMS CONFINED TO EASTERN LINCOLN AND NORTHEAST MOHAVE
COUNTY. TEMPERATURES WILL REMAIN 5 OR 6 DEGREES BELOW NORMAL TODAY
AND WILL WARM SLIGHTLY MONDAY AND TUESDAY.

.LONG TERM...STRONG HIGH PRESSURE BUILDS BACK OVER THE DESERT
SOUTHWEST AND SOUTHERN GREAT BASIN DURING THE EXTENDED PERIOD. THERE
IS VERY LITTLE QUESTION THAT TEMPERATURES WILL WARM BACK TO ABOVE
NORMAL UNDER THIS SCENARIO. HOWEVER...THE BIG QUESTION REMAINS TO BE
JUST HOW EFFECTIVELY DOES MOISTURE GET SCOURED OUT PRIOR TO THE HIGH
RE-CENTERING OVERHEAD. THIS COULD EASILY BE A CASE WHERE MOISTURE
BECOMES TRAPPED UNDER THE HIGH AND IS RE-CYCLED DAILY FOR DAYTIME
THUNDERSTORMS. FOR NOW...MAINTAINED A DRY FORECAST BUT THE
POSSIBILITY SHOULD BE CONSIDERED IN FUTURE PACKAGES.

.AVIATION...FOR MCCARRAN...MOSTLY SUNNY SKIES THIS MORNING BECOMING
PARTLY CLOUDY THIS AFTERNOON AS THUNDERSTORMS FORM OVER THE LOCAL
MOUNTAINS. VALLEY THUNDERSTORMS BECOME A POSSIBILITY THIS AFTERNOON
AND EVENING. CURRENT LIGHT WINDS WILL BECOME SOUTHEAST TO SOUTH
AROUND 10KTS TODAY EXCEPT NEAR THUNDERSTORMS AND OUTFLOW BOUNDARIES.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...MOSTLY CLEAR SKIES SOUTH WITH PARTLY CLOUDY CONDITIONS
NORTH THIS MORNING. INCREASING CLOUD COVER AND THUNDERSTORM ACTIVITY
BEGINNING OVER THE HIGHER TERRAIN BY EARLY AFTERNOON AND THEN IN THE
VALLEY LOCATIONS LATE AFTERNOON AND EVENING. WINDS GENERALLY WILL BE
UNDER 10KTS BUT ERRATIC AND GUSTY NEAR THUNDERSTORMS AND OUTFLOW
BOUNDARIES.
&&

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

MORGAN/JACQUES/HARRISON/SALMEN

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
542 AM PDT SUN AUG 23 2009

AZZ001>003-036-CAZ519>527-NVZ014>022-240500-
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-
542 AM PDT SUN AUG 23 2009 /542 AM MST SUN AUG 23 2009/

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

.DAY ONE...TODAY AND TONIGHT

A MOIST AND UNSTABLE AIR MASS IS IN PLACE OVER THE AREA. A LOW
PRESSURE SYSTEM APPROACHING FROM THE WEST AND SOLAR HEATING WILL
COMBINE WITH THIS AIR MASS TO GENERATE SCATTERED TO NUMEROUS
THUNDERSTORMS THIS AFTERNOON AND EVENING. THERE IS A SLIGHT RISK
OF SEVERE THUNDERSTORMS ACROSS EASTERN SAN BERNARDINO COUNTY AND
MUCH OF CLARK AND MOHAVE COUNTIES. SEVERE THUNDERSTORMS PRODUCE
WIND GUSTS 58 MPH OR GREATER AND HAIL AN INCH OR MORE IN DIAMETER.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

ISOLATED TO SCATTERED THUNDERSTORMS WILL LINGER MONDAY AS THE LOW
PRESSURE SYSTEM CONTINUES TO MOVE SLOWLY ACROSS THE AREA. A DRIER
AND MORE STABLE AIR MASS WILL MOVE IN BEGINNING TUESDAY WITH HIGH
PRESSURE BUILDING OVER THE AREA THROUGH THE END OF THE WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE LATE THIS MORNING OR EARLY THIS
AFTERNOON. SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT
WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.