FXUS65 KTWC 260408
AFDTWC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
915 PM MST FRI DEC 25 2009

.SYNOPSIS...DRY WEATHER WILL CONTINUE INTO THIS WEEKEND BUT WITH 
VARIABLE HIGH CLOUDS...COLD NIGHTS AND BELOW NORMAL HIGH 
TEMPERATURES. ANOTHER LOW PRESSURE SYSTEM WILL BRING A FEW VALLEY 
RAIN AND MOUNTAIN SNOW SHOWERS EARLY NEXT WEEK.

&&

.DISCUSSION...SOME LOWER LATITUDE ENERGY UNDERCUTTING THE WEST COAST 
RIDGE AND DIRTYING THINGS UP WITH INCREASING CLOUDS THIS WEEKEND. 
AFTER ANOTHER NIGHT OR TWO OF COLD TEMPERATURES THIS WILL HELP 
MITIGATE OVERNIGHT LOWS BEFORE THE NEXT SYSTEM ARRIVES EARLY NEXT 
WEEK. CURRENT FORECAST HAS GOOD TRENDS.

&&

.PREV DISCUSSION...HIGH PRESSURE ALOFT ALONG THE WEST COAST WILL 
PROVIDE THE AREA WITH DRY WEATHER...COLD NIGHTS...AND BELOW NORMAL 
HIGHS THIS WEEKEND. MODELS CONTINUED TO SHOW A SYSTEM PASSING NEAR 
THE REGION AROUND MONDAY NIGHT INTO LATE TUESDAY. THE LATEST FEW GFS 
MODEL SOLUTIONS CONTINUED TO DROP THE MAIN ENERGY SOUTH OF OUR AREA 
ACROSS NORTHERN MEXICO. IF THIS HAPPENS...MAINLY LOCATIONS NEAR THE 
INTERNATIONAL BORDER WILL HAVE THE BEST CHANCE OF SHOWERS. 
OTHERWISE...NO MAJOR CHANGES TO THE GOING FORECAST ON THE AFTERNOON 
PACKAGE.  

&&

.AVIATION...PATCHES OF CIRRUS LEVEL MOISTURE WITH SURFACE WINDS 
GENERALLY LESS THAN 10 KTS. AVIATION DISCUSSION NOT UPDATED FOR TAF 
AMENDMENTS.

&&

.FIRE WEATHER...NO FIRE WEATHER CONCERNS AT THIS TIME.
 
&&

.TWC WATCHES/WARNINGS/ADVISORIES...NONE.

$$

WEATHER.GOV/TUCSON