FXUS65 KTWC 232053
AFDTWC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
153 PM MST WED DEC 23 2009
.SYNOPSIS...THE STORM THAT BROUGHT WINDY CONDITIONS AND
PRECIPITATION TO SOUTHEAST ARIZONA WAS EXITING THE REGION TODAY.
COLDER AIR USHERED IN BY THE STORM WILL RESULT IN A COLD SPELL WITH
SOME LOWER DESERT LOCATIONS IN PIMA AND PINAL COUNTIES SEEING
FREEZING OR NEAR FREEZING TEMPERATURES FOR THE NEXT 3 TO 4 NIGHTS.
OTHERWISE...DRY WEATHER CAN BE ANTICIPATED FOR CHRISTMAS EVE INTO
THIS WEEKEND. HOWEVER...AFTERNOON TEMPERATURES WILL REMAIN BELOW
NORMAL.
&&
.DISCUSSION...THE UPPER LOW WAS CENTERED OVER CENTRAL NEW MEXICO
THIS AFTERNOON WITH WRAP AROUND CLOUDINESS ACROSS MUCH OF SOUTHEAST
ARIZONA...GENERALLY EAST OF A LINE FROM GLOBE TO TUCSON AND NOGALES.
AS THE UPPER LOW TRACKS FARTHER EAST THIS EVENING...EXPECT MUCH OF
THIS CLOUDINESS TO DISAPPEAR. THE COLDER AIR MASS ALREADY IN PLACE
WILL RESULT IN SOMEWHAT OF A COLD SNAP THE NEXT SEVERAL NIGHTS.
MINIMUM TEMPERATURES THE NEXT 3 TO 4 NIGHTS WILL BE AT OR NEAR
FREEZING IN MANY OF THE LOWER DESERT LOCATIONS OF PIMA AND PINAL
COUNTIES. SINCE MOST OF THIS AREA HAS ALREADY EXPERIENCED A FREEZE
IN THE PAST 30 DAYS...WILL NOT BE POSTING A FREEZING WARNING. THE
MAIN POINT HERE IS THAT AREAS NOT USE TO SEEING FREEZING
TEMPERATURES VERY OFTEN IN THE WINTER WILL LIKELY EXPERIENCE THEM AT
LEAST ONE OF THE UPCOMING NIGHTS THIS WEEK. SINGLE DIGIT LOW
TEMPERATURES CAN BE EXPECTED IN THE WHITE MOUNTAINS THE NEXT FEW
NIGHTS. OTHERWISE...A RIDGE OF HIGH PRESSURE ALOFT BUILDING ALONG
THE WEST COAST WILL PROVIDE THE AREA WITH DRY WEATHER THROUGH
SUNDAY. THEREAFTER...GFS AND ECMWF MODELS DEPICTED ANOTHER SYSTEM
IMPACTING THE REGION EARLY NEXT WEEK. FOR NOW...HAVE SHOWED THE
TREND OF INCREASING CLOUDINESS AND A CHANCE OF PRECIPITATION DURING
THIS PERIOD. DAYTIME TEMPERATURES WILL REMAIN SLIGHTLY BELOW NORMAL
THROUGH NEXT WEEK.
&&
.AVIATION...CLOUDS DECREASING AND BECOMING FEW-SCT AROUND 7-10K FT
AGL...MAINLY EAST OF TUCSON. MOSTLY CLEAR SKIES TONIGHT INTO
THURSDAY. SURFACE WINDS WLY/NWLY LESS THAN 10 KTS INTO THURSDAY.
AVIATION DISCUSSION NOT UPDATED FOR TAF AMENDMENTS.
&&
.FIRE WEATHER...NO FIRE WEATHER CONCERNS AT THIS TIME.
&&
.TWC WATCHES/WARNINGS/ADVISORIES...NONE.
$$
WEATHER.GOV/TUCSON
