Flash Flood Warning 6, NWS Las Vegas, NV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
300 PM PDT TUE JUL 24 2007

.SYNOPSIS...DEEP MONSOONAL MOISTURE OVER SOUTHERN NEVADA AND
NORTHWEST ARIZONA WILL REMAIN OVER PORTIONS OF THE SOUTHERN GREAT
BASIN AND MOJAVE DESERT THROUGH WEDNESDAY. SOME MOISTURE WILL REMAIN
OVER THE REGION THROUGH THE END OF THE WEEK ALLOWING FOR ISOLATED
THUNDERSTORMS EACH DAY.
&&

.SHORT TERM...FAIRLY ACTIVE AFTERNOON WITH SCATTERED THUNDERSTORMS
OVER THE EASTERN TWO THIRDS OF THE CWA. MAIN FOCUS HAS BEEN MOHAVE
COUNTY WHERE HEAVY RAIN AND FLASH FLOODING HAS BEEN OBSERVED. A
SECOND AREA JUST SOUTH TO SOUTHWEST OF LAS VEGAS HAS BEEN SLOWLY
MOVING NORTH AND WILL LIKELY MOVE INTO THE LAS VEGAS VALLEY THIS
AFTERNOON. HEAVY RAIN HAS BEEN THE MAIN FOCUS...BUT SEVERAL WET
MICROBURST HAVE BEEN NOTED BY ASOS AND LOCAL WEATHER SPOTTERS.
AREAS THAT HAVE NOT EXPERIENCED ANY RAINFALL ARE STILL QUITE
UNSTABLE AND ARE SHOWING HIGH CAPE LEVELS. DEW POINTS ARE STILL
RUNNING IN THE 60S AND PW VALUES WELL OVER AN INCH. SEVERAL STORMS
HAVE ALSO DEVELOPED IN WESTERN SAN BERNARDINO COUNTY...BUT EXPECT
THOSE TO BE MORE WIDESPREAD. WILL CONTINUE WITH THE FLASH FLOOD
WATCH THROUGH 10PM FOR THE SOUTHERN AND EASTERN PORTIONS OF THE CWA.
MODELS ARE SHOWING A LITTLE MORE DRY AIR OVER THE WESTERN ZONES
WEDNESDAY...SO THE MAIN FOCUS WILL PROBABLY REMAIN OVER THE EASTERN
HALF OF THE CWA. MODELS ARE SHOWING A DISTURBANCE MOVING THROUGH THE
SOUTHERN CWA WEDNESDAY AFTERNOON WHICH COULD BE THE TRIGGER FOR
ADDITIONAL STORMS.

.LONG TERM...LITTLE CHANGE WAS NEEDED TO THE FORECAST TRENDS
THURSDAY THROUGH NEXT TUESDAY AS THE MEAN POSITION OF THE BROAD HIGH
CIRCULATING OVER UTAH AND WESTERN COLORADO IS FORECAST TO GENERALLY
STAY IN PLACE. THIS WILL ALLOW LITTLE...IF ANY...DECREASE IN OVERALL
MOISTURE FOR THE AREA DURING THE PERIOD AND A MODERATE GRADE MONSOON
FORECAST OF MAINLY DIURNAL THUNDERSTORMS CAN BE EXPECTED.
&&

.AVIATION...FOR MCCARRAN...THUNDERSTORMS DEVELOPING TO THE SOUTH AND
SOUTHWEST OF THE LAS VEGAS VALLEY AT 22Z WERE MOVING SLOWLY NORTH
AND THERE IS A GOOD PROBABILITY THAT THEY WILL IMPACT KLAS BETWEEN
23Z AND 00Z WITH HEAVY RAIN...BRIEF LOW VISIBILITY AND GUSTY WINDS
UP TO 35 KTS. STORMS WERE REDEVELOPING BEHIND THE INITIAL LINE AND
ADDITIONAL THUNDERSTORMS COULD IMPACT KLAS BETWEEN 00Z AND 02Z.
SCATTERED THUNDERSTORMS WILL IMPACT ALL APPROACH CORRIDORS THROUGH
05Z THEN DIMINISH OVERNIGHT. THE CHANCE FOR AFTERNOON/EVENING
THUNDERSTORMS WILL CONTINUE DURING THE REST OF THE WEEK WITH LITTLE
CHANGE EXPECTED TO THE WEATHER PATTERN.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...THUNDERSTORM ACTIVITY WILL IMPACT ALL PARTS OF THE
FORECAST AREA LATE THIS AFTERNOON AND EVENING WITH THE DAILY CYCLE
OF AFTERNOON/EVENING STORMS AND WIDESPREAD DEBRIS CLOUD CEILINGS
PERSISTING THROUGHOUT THE WEEK.
&&

.VEF WATCHES/WARNINGS/ADVISORIES...
.NV...FLASH FLOOD WATCH FROM NOON UNTIL 10 PM NVZ015-022.
.AZ...FLASH FLOOD WATCH FROM NOON UNTIL 10 PM AZZ001-003/036
.CA...FLASH FLOOD WATCH FROM NOON UNTIL 10 PM CAZ524-527.
&&

GORELOW/ADAIR

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
946 AM PDT TUE JUL 24 2007

AZZ001>003-036-CAZ519>527-NVZ014>022-251315-
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-
946 AM PDT TUE JUL 24 2007 /946 AM MST TUE JUL 24 2007/

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

.DAY ONE...TODAY AND TONIGHT

DEEP MOISTURE...EXCESSIVELY UNSTABLE AIR AND LIGHT WINDS ALOFT
OVER SOUTHERN NEVADA... NORTHWEST ARIZONA AND EASTERN SAN
BERNARDINO COUNTY CALIFORNIA WILL BE FAVORABLE FOR HEAVY RAINFALL
AND FLASH FLOODING AS SCATTERED THUNDERSTORMS DEVELOP ACROSS THESE
AREAS THIS AFTERNOON. A FLASH FLOOD WATCH HAS BEEN ISSUED FROM
NOON UNTIL 10 PM THIS EVENING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH DAY...BUT
THE THREAT FOR FLASH FLOODING WILL DECREASE AS THUNDERSTORM
COVERAGE BECOMES MORE ISOLATED.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ACTIVATION MAY BE REQUIRED BY EARLY AFTERNOON.

JGA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1251 PM PDT TUE JUL 24 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1030 PM     FLASH FLOOD      HENDERSON               36.03N 115.00W
07/23/2007                   CLARK              NV   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED MINOR FLOODING NEAR THE
            INTERSECTION OF RUSSELL ROAD AND INTERSTATE 515. REPORTED
            BETWEEN A QUARTER AND HALF AN INCH OF WATER OVER THE ROAD
            WITH ISOLATED SECTIONS OF UP TO AN INCH.

&&

CBELL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
247 PM PDT TUE JUL 24 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0140 PM     FLASH FLOOD      PEACH SPRINGS           35.53N 113.43W
07/24/2007                   MOHAVE             AZ   TRAINED SPOTTER

            EXCESSIVE STORM RUNOFF CROSSING ROUTE 66 NEAR PEACH
            SPRINGS.

&&

BFUIS