000
FXUS65 KVEF 030350
AFDVEF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
850 PM PDT THU SEP 2 2010

.SYNOPSIS...HIGH PRESSURE WILL BUILD OVER AREA THROUGH SATURDAY
WITH TEMPERATURES WARMING TO POSSIBLY EXCESSIVE HEAT CRITERIA IN THE
LOWER DESERTS. A LOW PRESSURE SYSTEM WILL THEN MOVE ACROSS THE
REGION ON SUNDAY RESULTING IN COOLER TEMPERATURES AND LOCALLY GUSTY
WINDS FOR SUNDAY AND LABOR DAY.
&&

.UPDATE...CLEAR SKIS REMAIN OVER THE CWA THIS EVENING AS A RIDGE OF
HIGH PRESSURE BUILDS OVER THE AREA INTO SATURDAY WHICH WILL
ALLOW TEMPERATURES TO WARM BOTH FRIDAY AND SATURDAY. 00Z NAM
CONTINUES TO PLACE THE KLAS VALLEY AT OR JUST ABOVE EXCESSIVE HEAT
CRITERIA...107 DEGREES FOR SATURDAY AND WILL CONTINUE WITH THE
CURRENT EXCESSIVE HEAT WATCH FOR SATURDAY FOR THE LOWER DESERTS
REGIONS. NO UPDATES PLANNED FOR THIS EVENING.

.FIRE WEATHER...AS THE RIDGE BUILDS OVER THE AREA INTO SATURDAY...
DRY AND HOT CONDITIONS TO BE EXPERIENCED. A STORM MOVING INTO THE
PACIFIC NORTHWEST ON SATURDAY AND THEN ACROSS THE FIRE DISTRICT ON
SUNDAY WILL ALLOW FOR INCREASED WINDS ESPECIALLY OVER NEVADA FIRE
ZONES 460...461...462 ON SATURDAY AND THEN NEVADA ZONE 462 AND THE
NORTHERN PORTION OF ARIZONA ZONE 102 ON SUNDAY. WIND SPEEDS AT THIS
TIME APPEAR ARE EXPECTED TO REMAIN BELOW CRITICAL WIND CRITERIA WITH
GUSTS TO AROUND 30 MPH...SO ARE NOT LOOKING AT ANY FIRE WEATHER
WATCHES OR WARNINGS AT THIS TIME. HOWEVER WILL MONITOR INTO WEEKEND
FOR INDICATIONS THAT THE WINDS MAY BECOME STRONGER THAN CURRENT
THINKING. MINIMUM RELATIVE HUMIDITY VALUES WILL BE BELOW 15
PERCENT ACROSS MUCH OF THE DISTRICT SATURDAY AND SUNDAY.
&&

.PREV DISCUSSION
457 PM PDT THU SEP 2 2010

.DISCUSSION...HIGH PRESSURE WILL REMAIN ACROSS THE AREA THROUGH
SATURDAY. THIS WILL PUSH TEMPERATURES IN THE LAS VEGAS VALLEY TO 107
DEGREES OR HOTTER WHICH IS EXCESSIVE HEAT CRITERIA FOR THIS TIME OF
YEAR. THUS AN EXCESSIVE WATCH HAS BEEN ISSUED FOR LOCATIONS BELOW
4000 FEET. CONDITIONS ARE EXPECTED TO BE AT EXCESSIVE HEAT CRITERIA
FROM MAINLY 1 PM THROUGH 7 PM.

A TROUGH MOVES INTO THE PACIFIC NORTHWEST ON SUNDAY AND INTO THE
ROCKIES BY MONDAY. THERE IS NOT MUCH MOISTURE WITH THIS SYSTEM
BUT SOME GUSTY WINDS COULD BE A CONCERN. AT THIS TIME WIND GUSTS
REMAIN BELOW FIRE WEATHER CRITERIA THUS HAVE NOT ISSUED ANY TYPE
OF FIRE PRODUCT FOR SUNDAY. THIS TROUGH WILL BRING COOLER
TEMPERATURES TO THE FORECAST AREA. TEMPERATURES WILL REMAIN NEAR
TO BELOW NORMAL NEXT WEEK.

MOISTURE TRIES TO INCREASE FROM EAST TO WEST IN ARIZONA OVER THE
WEEKEND BUT REMAINS EAST OF MOHAVE COUNTY.

A SECOND STRONGER LOW PRESSURE SYSTEM WILL MOVE INTO THE PACIFIC
NORTHWEST ON TUESDAY AND INTO NEVADA BY THURSDAY. THIS SYSTEM WILL
HAVE STRONGER GUSTIER WINDS ON TUESDAY AND WEDNESDAY. THIS WILL BE
SOMETHING TO KEEP AN EYE ON.
&&

.AVIATION...
FOR MCCARRAN...NO SIGNIFICANT WEATHER IS EXPECTED...WITH
CLEAR SKIES AND RELATIVELY LIGHT WINDS FOLLOWING TYPICAL DIURNAL
PATTERNS.

FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST
CALIFORNIA...MOSTLY CLEAR AND DRY THROUGH THE WEEK WITH TYPICAL
DIURNAL WINDS AT OR BELOW 10 KTS.
&&


.VEF WATCHES/WARNINGS/ADVISORIES...
NV...EXCESSIVE HEAT WATCH FROM SATURDAY AFTERNOON THROUGH SATURDAY
     EVENING FOR NVZ016-017-020>022.
AZ...EXCESSIVE HEAT WATCH FROM SATURDAY AFTERNOON THROUGH SATURDAY
     EVENING FOR AZZ002-003-036.
CA...EXCESSIVE HEAT WATCH FROM SATURDAY AFTERNOON THROUGH SATURDAY
     EVENING FOR CAZ522>527.
&&

$$

JENSEN/81

HTTP://WEATHER.GOV/LASVEGAS

NWS VEF Office Area Forecast Discussion