Flash Flood Warning 20, NWS Las Vegas, NV

345 
WGUS75 KVEF 252333
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
433 PM PDT SAT JUL 25 2009

CAC071-260030-
/O.CON.KVEF.FF.W.0020.000000T0000Z-090726T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
433 PM PDT SAT JUL 25 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM PDT FOR NORTH
CENTRAL SAN BERNARDINO COUNTY...

AT 431 PM PDT...THE THUNDERSTORMS THAT CREATED THE EARLIER HEAVY 
RAIN HAS DISSIPATED AND ONLY LIGHT RAIN REMAINS. ADDITIONAL RAINFALL 
IS POSSIBLE IN THE WARNED AREA OVER THE NEXT HOUR AS CELLS CONTINUE 
TO FORM TO THE SOUTH ALONG INTERSTATE 15. 

EXCESSIVE RUNOFF FROM THE HEAVY RAINFALL WILL CAUSE ELEVATED WATER 
LEVELS IN NORMALLY DRY WASHES...SMALL STREAMS AND FLOODING OF 
SECONDARY ROADS THROUGH 530 PM.

IN DESERT TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN AND AFTER A HEAVY RAIN. DO NOT ATTEMPT TO 
TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. SEVERAL INCHES 
OF SWIFTLY FLOWING WATER CAN CARRY VEHICLES AWAY.
NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

LAT...LON 3578 11605 3579 11591 3579 11573 3553 11571
      3551 11602

$$

JS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
248 PM PDT SAT JUL 25 2009

.SYNOPSIS...SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS
WILL REMAIN OVER THE EASTERN PORTION OF THE MOJAVE DESERT AND
NORTHWEST ARIZONA THIS EVENING AND SUNDAY BEFORE A VERY GRADUAL
DRYING TREND TAKES PLACE INTO THE MIDDLE OF NEXT WEEK. TEMPERATURES
WILL WARM BACK TO SEASONAL NORMALS ON MONDAY AND REMAIN THERE
THROUGH THE WEEK.
&&

.SHORT TERM...SCATTERED THUNDERSTORMS WITH HEAVY RAIN HAVE BEEN
ANCHORED TO THE HIGHER TERRAIN OF THE MOJAVE NATIONAL
PRESERVE...SPRING MTNS AND SHEEP RANGE SO FAR TODAY. THESE STORMS
HAVE BACK BUILDING TO THE SOUTH. AS OF THIS WRITING DO HAVE A CELL
IN THE SOUTHERN VEGAS VALLEY THAT DEVELOPED ALONG LEADING EDGE OF A
BOUNDARY. AM SURPRISED HOW QUITE MOHAVE COUNTY HAS BEEN SETTING IN
THE DEEPER MOISTURE. MODELS REMAIN CONSISTENT SHIFTING HIGH CENTER
WESTWARD THE NEXT SEVERAL DAYS WHICH WILL LEAD TO A GRADUAL DECREASE
IN MOISTURE. ENOUGH MOISTURE DOES LINGER FOR AT LEAST A SLIGHT
CHANCE OF THUNDERSTORMS OVER THE MOUNTAINS. TEMPERATURES WILL WARM
UP TO SEASONAL NORMALS IF NOT A FEW DEGREES OVER AS THE HIGH SHIFTS
WEST AND THE AIR MASS DRIES.

.LONG TERM...HIGH PRESSURE WILL REMAIN OVER THE WEST WITH JUST
ENOUGH MOISTURE CIRCULATING AROUND FOR THE CONTINUATION OF A SLIGHT
CHANCE OF THUNDERSTORMS FROM THE SIERRA CREST...EAST ACROSS SOUTH
CENTRAL NEVADA AND NORTHWEST ARIZONA TUESDAY THROUGH FRIDAY.
ECMWF/GFS SIMILAR MOVING A TROUGH NEAR THE NORTHERN CALIFORNIA COAST
NEXT SATURDAY. SOUTHWEST FLOW SHOULD BE STRONG ENOUGH TO SCOUR
MOISTURE OUT OF THE AREA. TEMPERATURES SHOULD REMAIN ABOVE NORMAL
VALUES OVERALL.
&&

.AVIATION...FOR MCCARRAN...AN ISOLATED THUNDERSTORM WILL CONTINUE TO
DRIFT NORTH ACROSS THE VALLEY THROUGH 01Z THIS EVENING...IMPACTING
ALL CORRIDORS. LWR CIGS AND VSBYS WILL OCCUR AS THE STORM PASSES
OVER. CLOUD COVER IS EXPECTED TO DISSIPATE SOME TONIGHT. THE
ATMOSPHERE STAYS RATHER MOIST ON SUNDAY WITH SCATTERED THUNDERSTORMS
OCCURRING OVER THE SURROUNDING MOUNTAINS. HEAVY RAINFALL WILL REMAIN
THE THREAT TOMORROW AS WELL...WITH LOWER CIGS AND REDUCED VSBY
ASSOCIATED WITH POCKETS OF HEAVIER PRECIP.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS THE AREA
THROUGH THIS EVENING WITH THE MAIN CONCERN BEING HEAVY RAINFALL
REDUCING VSBY AND LOWERING CIGS...IN ADDITION TO TYPICAL GUSTY AND
ERRATIC WINDS. AWAY FROM TSTMS...WINDS WILL FOLLOW DIURNAL TRENDS
AND CLOUDS SHOULD MAINLY BE AOA 14K FEET. SIMILAR CONDITIONS WILL
EXIST SUNDAY WITH STORMS STAYING ANCHORED MAINLY TO THE MOUNTAINS.
&&

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

PIERCE

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
513 AM PDT SAT JUL 25 2009

AZZ001>003-036-CAZ524-526-527-NVZ015-016-020>022-260400-
NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-
LAKE MEAD NATIONAL RECREATION AREA-EASTERN MOJAVE DESERT-
CADIZ BASIN-SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY-
LINCOLN COUNTY-NORTHEAST CLARK COUNTY-LAS VEGAS VALLEY-
SOUTHERN CLARK COUNTY-
513 AM PDT SAT JUL 25 2009 /513 AM MST SAT JUL 25 2009/

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

.DAY ONE...TODAY AND TONIGHT
MOIST CONDITIONS REMAIN OVER THE AREA AND THIS COMBINED WITH
DAYTIME HEATING AND AN UNSTABLE AIRMASS WILL CREATE SCATTERED
THUNDERSTORMS MAINLY THIS AFTERNOON AND EVENING. LOCAL HEAVY
RAINFALL IS POSSIBLE WITH THESE THUNDERSTORMS AS WELL AS GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
DRIER CONDITIONS ARE EXPECTED ON SUNDAY...BUT SCATTERED AFTERNOON
AND EVENING THUNDERSTORMS ARE STILL EXPECTED OVER THE AREA.
FURTHER DRYING IS THEN EXPECTED MONDAY THROUGH FRIDAY. HOWEVER
ISOLATED THUNDERSTORMS WILL CONTINUE TO FORM IN THE AFTERNOON...MAINLY
OVER THE MOUNTAINS THROUGH WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED TODAY. SPOTTERS ARE ENCOURAGED TO
REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD OPERATING
PROCEDURES.

CAZ519>523-525-NVZ014-017>019-260400-
EASTERN SIERRA SLOPES-OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY-
DEATH VALLEY NATIONAL PARK-WESTERN MOJAVE DESERT-MORONGO BASIN-
ESMERALDA AND CENTRAL NYE COUNTY-
WESTERN CLARK AND SOUTHERN NYE COUNTY-SHEEP RANGE-
SPRING MOUNTAINS-
513 AM PDT SAT JUL 25 2009

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

.DAY ONE...TODAY AND TONIGHT
ISOLATED TO SCATTERED THUNDERSTORMS EXPECTED MAINLY THIS AFTERNOON
AND EVENING. BRIEF HEAVY RAINFALL AND GUSTY WINDS MAY BE SEEN FROM
THESE STORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
MAINLY AFTERNOON AND EVENING THUNDERSTORMS WILL BE SEEN SUNDAY...BUT
OVERALL A DRYING TRENDS WILL BE TAKING PLACE. BY MONDAY
THUNDERSTORMS SHOULD BE CONFINED TO MAINLY THE SOUTHERN SIERRA
WITH STORMS POSSIBLY FORMING OVER THE SIERRA THROUGH WEDNESDAY WHILE
THE REMAINDER OF THE AREA SHOULD SEE MOSTLY SUNNY DAYTIME SKIES.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED TODAY. SPOTTERS ARE ENCOURAGED TO
REPORT ANY SIGNIFICANT WEATHER ACCORDING TO STANDARD OPERATING
PROCEDURES.