Flash Flood Warning 19, NWS Las Vegas, NV

029 
WGUS75 KVEF 132315
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
412 PM PDT SUN JUL 13 2008

CAC027-132322-
/O.CAN.KVEF.FF.W.0019.000000T0000Z-080714T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
INYO CA-
412 PM PDT SUN JUL 13 2008

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN INYO
COUNTY...

AT 411 PM PDT...RADAR SHOWED THAT THE THUNDERSTORM OVER SOUTHEAST 
INYO COUNTY HAD WEAKENED. RAINFALL RATES HAD DECREASED 
SIGNIFICANTLY...ALONG WITH THE THREAT OF FLOODING. THUS...THE FLASH 
FLOOD WARNING HAS BEEN CANCELLED.

ANYONE HIKING IN THE SOUTHERN END OF DEATH VALLEY NATIONAL PARK 
SHOULD REMAIN ON HIGH GROUND UNTIL FLOWS SUBSIDE IN WASHES AND 
ARROYOS.

LAT...LON 3579 11695 3616 11695 3607 11646 3589 11646

$$

MORGAN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
315 PM PDT SUN JUL 13 2008

.SYNOPSIS...AN UPPER LEVEL DISTURBANCE WILL PERSIST OVER THE AREA
THROUGH TUESDAY AND WILL COMBINE WITH A MOIST AND UNSTABLE AIR MASS
TO PRODUCE ISOLATED TO SCATTERED THUNDERSTORMS...ESPECIALLY
DURING THE AFTERNOON AND EVENING HOURS. SOME STORMS MAY PRODUCE
HEAVY RAINFALL. STORM COVERAGE WILL GRADUALLY DECREASE BY THE MIDDLE
OF THE WEEK AS DRIER SOUTHWEST FLOW DEVELOPS.
&&

.SHORT TERM...UPPER LOW/TROUGH/DEFORMATION ZONE CONTINUING TO PLAQUE
THE AREA AS IT COMBINES WITH A MOIST AND UNSTABLE AIR MASS TO
PRODUCE ISOLATED TO SCATTERED THUNDERSTORMS OVER THE FORECAST AREA.
HEAVY RAIN HAS BEEN THE MAIN PROBLEM WITH THESE STORM DUE TO BOTH
HIGH RAINFALL RATES AND SLOW MOVEMENT OF STORMS. THE UPPER LOW IS
FORECAST TO WEAKEN THROUGH TUESDAY BUT STILL EXPECTED ISOLATED TO
SCATTERED THUNDERSTORMS AS THE MOISTURE WILL NOT GET FLUSHED OUT
UNTIL WE GET A BETTER SOUTHWEST FLOW IN HERE.

.LONG TERM...NO CHANGES MADE TO THE EXTENDED FORECAST WITH MODELS
SHOWING GOOD CONTINUITY TODAY. /PREV LONG TERM DISCUSSION FROM 450
AM PDT/ NOT MUCH HAS CHANGED IN THE EXTENDED MODELS AS DRIER AIR
WILL GRADUALLY FILTER INTO THE AREA FROM THE WEST. EXPECT TO SEE
ISOLATED TO SCATTERED THUNDERSTORMS OVER THE EASTERN THIRD OF THE
CWA WEDNESDAY AND THURSDAY WITH DECREASING CHANCES WEST. MODELS
DIFFER SLIGHTLY FRIDAY AND SATURDAY AS A WESTERLY FLOW ALOFT
STRENGTHENS. GFS CONTINUING TO PUSH THE MOISTURE BOUNDARY EAST AND
KEEPING THUNDERSTORM CHANCES MAINLY OVER MOHAVE COUNTY. THE ECMWF IS
SLOWER TO PUSH THE MOISTURE EAST AND KEEPS THE MOISTURE BOUNDARY
NEAR THE CLARK/NYE COUNTY LINE. BASICALLY COMPROMISED AND KEPT
SLIGHT CHANCES OVER MOHAVE COUNTY WITH POPS AROUND 15 PERCENT OVER
CLARK COUNTY.
&&

.AVIATION...FOR MCCARRAN...THUNDERSTORMS CURRENTLY OVER THE LAS
VEGAS VALLEY ARE RESULTING IN HIGHLY VARIABLE WINDS AT KLAS AT THE
MOMENT. THIS WILL CONTINUE THROUGH AT LEAST 23Z TODAY AS STORMS KEEP
REDEVELOPING. WILL HOLD OFF ON ISSUING AN AIRPORT WEATHER
WARNING...WITH TSTMS SHOWING A MINIMAL WIND THREAT SO FAR TODAY
BECAUSE OF AMOUNT OF MOISTURE IN THE LOWER LEVELS. WINDS WILL BE
GUSTY WITH TSTMS...JUST FEEL SPEEDS WILL BE BELOW 35KT CRITERIA 99
PERCENT OF THE TIME. THIS EVENING...THERE WILL STILL BE CHANCE FOR
TSTMS IN THE VICINITY...BUT WILL BE MINIMAL AT KLAS SINCE CURRENT
CONVECTION HAS EFFECTIVELY OVERTURNED THE ATMOSPHERE...AND THINGS
ARE MORE STABLE...WITH SURFACE TEMPS REMAINING RELATIVELY COOL THE
REMAINDER OF THE DAY. SCATTERED THUNDERSTORM COVERAGE IS EXPECTED
ALONG ALL APPROACH CORRIDORS BY LATE THIS AFTERNOON.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...SCATTERED CONVECTION WILL CONTINUE INTO THE
EVENING...DIMINISHING BY MIDNIGHT.  TOMORROW...MORE OF THE SAME
EXPECTED...THUNDERSTORMS DEVELOPING EARLY IN THE AFTERNOON...AND
DIMINISHING DURING THE EVENING....ESPECIALLY OVER HIGHER TERRAIN.

.VEF WATCHES/WARNINGS/ADVISORIES...
NV...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR NVZ014-017.
AZ...NONE.
CA...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR CAZ519>523.
&&

HARRISON/KENNEDY

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
600 AM PDT SUN JUL 13 2008

CAZ519>523-NVZ014-017-140700-
EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
DEATH VALLEY NATIONAL PARK-WESTERN MOJAVE DESERT-
ESMERALDA AND CENTRAL NYE COUNTY-
WESTERN CLARK AND SOUTHERN NYE COUNTY-
600 AM PDT SUN JUL 13 2008

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

.DAY ONE...TODAY AND TONIGHT

A FLASH FLOOD WATCH IS IN EFFECT FOR THE FOLLOWING AREAS...
IN CALIFORNIA...DEATH VALLEY NATIONAL PARK...EASTERN SIERRA
SLOPES...OWENS VALLEY...WESTERN MOJAVE DESERT AND WHITE MOUNTAINS
OF INYO COUNTY. IN NEVADA...ESMERALDA AND CENTRAL NYE COUNTY AND
WESTERN CLARK AND SOUTHERN NYE COUNTY. SCATTERED SLOW MOVING
THUNDERSTORMS WITH THE POTENTIAL TO PRODUCE HEAVY RAINFALL ARE
EXPECTED TO DEVELOP TODAY THEN GRADUALLY DISSIPATE LATE TONIGHT.
THUNDERSTORMS WILL BE MORE NUMEROUS OVER THE MOUNTAINS OF INYO
COUNTY. THESE STORMS HAVE THE POTENTIAL TO PRODUCE BETWEEN ONE AND
TWO INCHES OF RAIN IN AN HOUR OR LESS. RUNOFF FROM INTENSE
RAINFALL CAN EASILY PRODUCE FLASH FLOODING OF NORMALLY DRY WASHES
AND DEBRIS FLOWS NEAR RECENT BURN AREAS...SUCH AS THE HONEYBEE
BURN AREA.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SCATTERED THUNDERSTORMS CAN BE EXPECTED ACROSS THE REGION MONDAY
FOLLOWED BY DECREASING COVERAGE TUESDAY THROUGH THE END OF THE
WEEK AS DRY SOUTHWEST FLOW DEVELOPS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY. SPOTTERS ARE ALWAYS
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER AS SOON AS IT IS
SAFE TO DO SO.

AZZ001>003-036-CAZ524>527-NVZ015-016-018>022-140700-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-EASTERN MOJAVE DESERT-
MORONGO BASIN-CADIZ BASIN-SAN BERNARDINO COUNTY-
UPPER COLORADO RIVER VALLEY-LINCOLN COUNTY-NORTHEAST CLARK COUNTY-
SHEEP RANGE-SPRING MOUNTAINS-LAS VEGAS VALLEY-
SOUTHERN CLARK COUNTY-
600 AM PDT SUN JUL 13 2008 /600 AM MST SUN JUL 13 2008/

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 WILL COMBINE WITH AN UPPER LEVEL
IMPULSE TO PRODUCE SCATTERED THUNDERSTORMS...MAINLY DURING THE
AFTERNOON AND EVENING HOURS. IN ADDITION TO DANGEROUS LIGHTNING
AND POSSIBLY STRONG WINDS...THE POTENTIAL FOR HEAVY RAIN COULD
PRODUCE ISOLATED FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SCATTERED THUNDERSTORMS CAN BE EXPECTED AGAIN MONDAY FOLLOWED BY
DECREASING COVERAGE TUESDAY THROUGH THE END OF THE WEEK AS DRY
SOUTHWEST FLOW DEVELOPS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY. SPOTTERS ARE ALWAYS
ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER AS SOON AS IT IS
SAFE TO DO SO.

ADAIR