Flash Flood Warning 45, NWS Las Vegas, NV

000
WGUS75 KVEF 070417
FFSVEF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
917 PM PDT WED AUG 6 2008

NVC003-070427-
/O.CAN.KVEF.FF.W.0045.000000T0000Z-080807T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLARK NV-
917 PM PDT WED AUG 6 2008

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTH CENTRAL CLARK
COUNTY...

AT 915 PM PDT...RADAR SHOWED THAT HEAVY RAIN HAD MOVED OUT OF THE 
WARNED AREA. NO REPORTS OF FLOODING HAD BEEN RECEIVED...SO THE 
WARNING HAS BEEN CANCELLED.

LAT...LON 3670 11479 3670 11457 3652 11457 3652 11479

$$

MORGAN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
330 PM PDT WED AUG 6 2008

.SYNOPSIS...MOIST AND UNSTABLE AIR WILL REMAIN OVER SOUTHERN
NEVADA...NORTHWEST ARIZONA AND NEARBY SOUTHEAST CALIFORNIA THROUGH
FRIDAY FOR ISOLATED TO SCATTERED AFTERNOON AND EVENING
THUNDERSTORMS. LOCALLY HEAVY RAIN WILL BE POSSIBLE WITH SOME STORMS.
A DRIER SOUTHWEST FLOW IS FORECAST TO DEVELOP FOR THE WEEKEND WITH
THUNDERSTORMS MAINLY CONFINED TO NORTHWEST ARIZONA.
&&

.SHORT TERM...CONVECTION AS EXPECTED TODAY WITH MAINLY ISOLATED
STORMS OVER THE EASTERN HALF OF THE CWA. STRONGEST STORMS ARE MAINLY
LOCATED OVER SOUTHERN UTAH AND NORTHERN ARIZONA WITH SEVERAL
OUTFLOW BOUNDARIES FLOATING AROUND. RUC AND TO SOME EXTENT THE NAM
ARE SHOWING A WEAK DISTURBANCE OVER NORTHERN ARIZONA WHICH IS
FORECAST TO SLOWLY DRIFT NORTH THIS EVENING. EXPECT THIS AREA TO SEE
THE BETTER ORGANIZED CONVECTION WHICH MAY EXTEND INTO MOHAVE COUNTY.
WILL ALSO NEED TO WATCH CONVECTION OVER SOUTHWEST UTAH WHICH COULD
SEND OUTFLOW BOUNDARIES SOUTH INTO CLARK COUNTY AND GENERATE
CONVECTION. DRIER AIR HAS PUSHED INTO THE WESTERN ZONES AS A TROUGH
OF LOW PRESSURE DIGS OFF THE WEST COAST...HOWEVER MOISTURE WILL
STILL REMAIN OVER THE EASTERN HALF OF THE CWA THROUGH FRIDAY WITH A
SLOW DRYING TREND FROM THE WEST. ISOLATED CONVECTION WILL CONTINUE
OVER THE EASTERN HALF OF THE CWA THROUGH FRIDAY WITH THE POTENTIAL
OF HEAVY RAIN AS ANY STORMS WILL BE SLOW MOVERS.
&&

.LONG TERM...THE UPPER FLOW BECOMES MORE WESTERLY OVER THE AREA THIS
WEEKEND AND INTO NEXT WEEK AS LOW PRESSURE MOVES ACROSS OREGON AND
THE NORTHERN TIER STATES. THIS FLOW IS NOT AS CONDUCIVE TO TSTORM
DEVELOPMENT WITHIN THE CWA AND HAVE INDICATED THIS IN THE GRIDS BY
LIMITING THE BEST POTENTIAL TO MOHAVE COUNTY FROM SATURDAY ONWARDS.
MAINTAINED A MENTION OF A SLIGHT CHANCE OF STORMS IN LINCOLN AND
CLARK COUNTIES OVER THE WEEKEND AS WELL SINCE MODELS CONTINUE TO
SHOW SOME INSTABILITY AND MOISTURE IN THESE AREAS AT THAT TIME
FRAME. EARLY NEXT WEEK...MODEL MOISTURE PARAMETER FORECASTS SHOW
RELATIVELY DRY AIR PUSHING INTO MUCH OF THE CWA WITH THE MORE MOIST
CONDITIONS CONFINED TO THE SOUTHEASTERN AREAS. THIS APPEARS TO BE
DUE TO WEAK IMPULSES MOVING THROUGH THE FLOW AND IMPEDING A COMPLETE
SCOURING OF MOISTURE IN THAT REGION. LESS MOISTURE AND CLOUD COVER
SHOULD ALLOW TEMPERATURES TO RECOVER BACK TO ABOVE NORMAL LEVELS BY
EARLY NEXT WEEK.
&&

.AVIATION...FOR MCCARRAN...ISOLATED THUNDERSTORMS REMAIN POSSIBLE
THROUGH EARLY EVENING AND WILL BE CAPABLE OF PRODUCING BRIEF HEAVY
RAIN AND STRONG...ERRATIC WINDS WHERE THEY DEVELOP. THUNDERSTORMS
THAT HAVE FORMED SOUTH OF THE AREA THIS AFTERNOON WILL EVENTUALLY
TURN WINDS TO THE SOUTH SOUTHEAST AS OUTFLOW BOUNDARIES RELEASED
FROM THESE STORMS PUSH INTO THE VALLEY. ADDITIONALLY...ISOLATED
STORMS ARE POSSIBLE IN ALL APPROACH CORRIDORS THROUGH EARLY EVENING.
CEILINGS IN GENERAL WILL REMAIN AOA 15K FEET.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...ISOLATED TO SCATTERED THUNDERSTORM COVERAGE TO CONTINUE
OVER THE NEXT COUPLE OF DAYS PRIMARILY IN THE AFTERNOON AND EARLY
EVENINGS. THE MAIN IMPACTS WILL BE BRIEF HEAVY RAIN AND GUSTY...
ERRATIC WINDS IN AND AROUND THUNDERSTORMS. WINDS WILL GENERALLY BE
SOUTHERLY WITH GUSTS TO AROUND 20 KTS. CEILINGS ARE EXPECTED TO
REMAIN AOA 15K FEET.
&&

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

GORELOW/SALMEN

HTTP://WEATHER.GOV/LASVEGAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAS VEGAS NV
625 AM PDT WED AUG 6 2008

AZZ001>003-036-CAZ519>527-NVZ014>022-070700-
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-
625 AM PDT WED AUG 6 2008 /625 AM MST WED AUG 6 2008/

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

.DAY ONE...TODAY AND TONIGHT

MOIST AND UNSTABLE AIR OVER THE EASTERN HALF OF THE REGION WILL
LEAD TO ANOTHER ROUND OF ISOLATED TO SCATTERED THUNDERSTORMS
DURING THE AFTERNOON AND EVENING. THUNDERSTORMS CAPABLE OF
PRODUCING HEAVY RAIN CAN BE EXPECTED OVER GENERALLY THE SAME AREA
AS TUESDAY...MAINLY SOUTHEAST NEVADA AND NORTHWEST ARIZONA. THE
PRIMARY THREAT WILL BE ISOLATED FLASH FLOODING. SCATTERED
THUNDERSTORMS WITH LIGHT TO MODERATE RAIN SHOWERS AND POSSIBLY
SMALL HAIL CAN BE EXPECTED OVER THE SOUTHERN SIERRA AND ESMERALDA
COUNTY NEVADA.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORMS WILL PERSIST ACROSS THE SAME AREA THURSDAY THEN
BEGIN TO DECREASE IN COVERAGE FROM WEST TO EAST FRIDAY THROUGH
THE WEEKEND AS DRIER SOUTHWEST FLOW DEVELOPS. ISOLATED
THUNDERSTORMS WILL BE CONFINED TO NORTHWEST ARIZONA SATURDAY
THROUGH TUESDAY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.