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A COLD LOW PRESSURE SYSTEM WITH UNSETTLED WEATHER THIS WE...

NATIONAL WEATHER SERVICE PHOENIX AZ
659 PM MST FRI DEC 15 2006

AZZ021>024-026>028-161200-
WEST CENTRAL DESERTS-NORTHWEST MARICOPA COUNTY-
GREATER PHOENIX AREA-SOUTHERN GILA/TONTO NF FOOTHILLS-
SOUTHWEST DESERTS-SOUTHWEST MARICOPA COUNTY-
NORTHWEST AND NORTH CENTRAL PINAL COUNTY-
INCLUDING THE CITIES OF...BOUSE...QUARTZSITE...SALOME...
LAKE PLEASANT...MORRISTOWN...NEW RIVER...TONOPAH...BUCKEYE...
WICKENBURG...CAREFREE...CAVE CREEK...CHANDLER...FOUNTAIN HILLS...
GILBERT...GLENDALE...MESA...PEORIA...PHOENIX...SCOTTSDALE...
SUN CITY...TEMPE...GLOBE...MIAMI...SAN CARLOS...SUPERIOR...
ALSO INCLUDING APACHE...BARTLETT...CANYON...HORSESHOE...
ROOSEVELT...AND SAGUARO LAKES...DATELAND...TACNA...WELLTON...
GILA BEND...APACHE JUNCTION...CASA GRANDE...COOLIDGE...FLORENCE
659 PM MST FRI DEC 15 2006


...A COLD LOW PRESSURE SYSTEM WITH UNSETTLED WEATHER THIS WEEKEND...

A STRONG LOW PRESSURE SYSTEM IS EXPECTED TO SLOWLY DEVELOP OVER
ARIZONA SATURDAY NIGHT THROUGH TUESDAY BRINGING A MAJOR CHANGE
TOWARD COLD UNSETTLED WEATHER.

AS THE COLD FRONT APPROACHES SATURDAY...GUSTY SOUTH WINDS TO 35 MPH WILL
DEVELOP ACROSS THE SOUTHWEST AND SOUTH CENTRAL DESERTS AND MOUNTAINS
BY AFTERNOON. AREAS OF BLOWING DUST CAN ALSO BE EXPECTED.

AS A MUCH COLDER AIRMASS SETTLES OVER ARIZONA LATE SATURDAY NIGHT
THROUGH TUESDAY...UNSETTLED WEATHER WILL DEVELOP WITH A THREAT FOR
SHOWERS EACH DAY. THE COLDEST AIR WILL ARRIVE SUNDAY NIGHT AND MONDAY
WITH THE POTENTIAL FOR SNOW LEVELS TO FALL TO NEAR 4000 FEET.

BECAUSE OF THE COMPLEXITY OF THIS VERY LARGE LOW PRESSURE SYSTEM...
AND ITS SLOW EVOLUTION...PRECIPITATION AMOUNTS OF RAIN AND MOUNTAIN SNOW
WILL BE DIFFICULT FORECAST. HOWEVER HIKERS...CAMPERS...AND MOTORISTS
SHOULD BE AWARE OF MAJOR CHANGE TOWARD COLD UNSETTLED WEATHER.


$$

AZZ020-025-CAZ030>033-161200-
LOWER COLORADO RIVER VALLEY AZ-YUMA/MARTINEZ LAKE AND VICINITY-
JOSHUA TREE NATIONAL PARK-LOWER COLORADO RIVER VALLEY CA-
RIVERSIDE COUNTY/EASTERN DESERTS-IMPERIAL COUNTY-
INCLUDING THE CITIES OF...EHRENBERG...PARKER...SAN LUIS...
SOMERTON...YUMA...FORTUNA FOOTHILLS...COTTONWOOD VISITOR CENTER...
LOST HORSE-KEYS VIEW JTNP...BLYTHE...CHIRIACO SUMMIT...
DESERT CENTER...EAGLE MTN...MIDLAND...BRAWLEY...CALEXICO...
EL CENTRO...GLAMIS...IMPERIAL...AND THE SALTON SEA
659 PM MST FRI DEC 15 2006 /559 PM PST FRI DEC 15 2006/


...A COLD LOW PRESSURE SYSTEM WITH UNSETTLED WEATHER THIS WEEKEND...

A STRONG LOW PRESSURE SYSTEM IS EXPECTED TO SLOWLY DEVELOP OVER
SOUTHEAST CALIFORNIA SATURDAY NIGHT THROUGH MONDAY...BRINGING A
MAJOR CHANGE TOWARD VERY COLD UNSETTLED WEATHER.

AS THE COLD FRONT APPROACHES SATURDAY...STRONG SOUTHWEST WINDS TO
40 MPH WILL BE WIDESPREAD BY AFTERNOON ACROSS THE DESERTS AND
MOUNTAINS...ALONG WITH AREAS OF BLOWING DUST AND SAND. THE STRONGEST
WIND WILL DEVELOP OVER THE IMPERIAL VALLEY...THE SALTON SEA...AND
OVER JOSHUA TREE NATIONAL PARK.

AS A MUCH COLDER AIRMASS SETTLES OVER THE AREA LATE SATURDAY NIGHT
THROUGH MONDAY...UNSETTLED WEATHER WILL DEVELOP...PARTICULARLY IN THE
MOUNTAINS...WITH A THREAT FOR SHOWERS EACH DAY. THE COLDEST AIR WILL
ARRIVE SUNDAY AND SUNDAY NIGHT WITH THE POTENTIAL FOR SNOW LEVELS
TO FALL TO NEAR 2000 FEET...WITH SEVERAL INCHES POSSIBLE IN JOSHUA
TREE NATIONAL PARK.

BECAUSE OF THE COMPLEXITY OF THIS VERY LARGE LOW PRESSURE SYSTEM...
AND ITS SLOW EVOLUTION...PRECIPITATION AMOUNTS OF RAIN AND SNOW WILL
BE DIFFICULT FORECAST. HOWEVER HIKERS...CAMPERS...AND MOTORISTS
SHOULD BE AWARE OF MAJOR CHANGE TOWARD COLD UNSETTLED WEATHER.


$$






EDIS-12-15-06 1800 PST