HAZARDOUS WEATHER OUTLOOK
Issue Date: 549 AM MST THU DEC 3 2009
Expiration: 600 AM MST FRI DEC 04 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME SOUTHWEST
ARIZONA...EXTREME WEST-CENTRAL ARIZONA...SOUTH-CENTRAL ARIZONA...
SOUTHWEST ARIZONA...WEST-CENTRAL ARIZONA AND EXTREME SOUTHEAST
CALIFORNIA.
.DAY ONE...TODAY AND TONIGHT
NO WEATHER HAZARDS ARE EXPECTED.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
THE COMBINATION OF COLDER AND MUCH DRIER AIR...ALONG WITH LIGHT
WIND...WILL CAUSE TEMPERATURES TO FALL TO NEAR OR BELOW FREEZING OVER
MUCH OF THE ARIZONA AND SOUTHEAST CALIFORNIA DESERT FRIDAY NIGHT. AT
THIS TIME LOCAL FREEZE WARNING CRITERIA ARE NOT BEING MET...BUT IT IS
A BORDERLINE SITUATION. IT IS POSSIBLE THAT IF THE AIRMASS ENDS UP
SLIGHTLY COLDER THAN FORECAST...GIVEN THE DRY AIR EXPECTED TO BE IN
PLACE WE MAY YET NEED TO ISSUE A FREEZE WARNING OVER MUCH OF THE
LOWER DESERT FOR FRIDAY NIGHT.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED.
SPECIAL WEATHER STATEMENT
Issue Date: 537 AM MST THU DEC 3 2009
Expiration: 400 PM MST THU DEC 03 2009
...VERY COLD AND DRY CONDITIONS FRIDAY NIGHT WITH A CHANGE TO MUCH
WETTER WEATHER EARLY NEXT WEEK...
A WEATHER DISTURBANCE AND ASSOCIATED COLD FRONT MOVING SOUTH THROUGH
THE ROCKIES WILL USHER IN COOLER AND MUCH DRIER AIR TO THE REGION
TONIGHT INTO FRIDAY. ON FRIDAY NIGHT...THE COMBINATION OF VERY DRY
AND COOLER AIR ALONG WITH LIGHT WIND WILL CAUSE TEMPERATURES TO LOWER
INTO THE 30S...OR EVEN BELOW FREEZING...OVER MUCH OF THE ARIZONA AND
SOUTHEAST CALIFORNIA DESERT. SOME FORECAST LOW TEMPERATURES FOR
SATURDAY MORNING INCLUDE 37 AT PHOENIX...32 AT IMPERIAL...31 AT GILA
BEND...AND 29 AT BOTH CASA GRANDE AND BLYTHE.
AT THIS TIME...FORECAST LOW TEMPERATURES WILL FALL SLIGHTLY SHORT OF
FREEZE WARNING CRITERIA. HOWEVER...CONDITIONS WILL BE BORDERLINE AND
DESERT DWELLERS SHOULD BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD
A FREEZE WARNING EVENTUALLY BE NEEDED.
THE VERY DRY AIRMASS WILL SOON BE REPLACED BY A MUCH MORE HUMID
ONE...AS A LARGE LOW PRESSURE SYSTEM DEVELOPING OVER THE PACIFIC
NORTHWEST BEGINS TO SPREAD SUBTROPICAL MOISTURE INTO THE AREA LATER
THIS WEEKEND AND EARLY NEXT WEEK. THE LOW IS EXPECTED TO MOVE
SOUTHEAST AND ACROSS ARIZONA MONDAY INTO TUESDAY...PRODUCING
SCATTERED SHOWERS OVER THE LOWER DESERT...AND NUMEROUS SHOWERS OVER
THE HIGHER TERRAIN EAST OF PHOENIX. AT THIS TIME THE BEST CHANCES FOR
RAIN APPEAR TO BE MONDAY NIGHT...AND LOCALLY HEAVY RAINFALL IS
POSSIBLE ACROSS THE HIGHER ELEVATIONS NORTH AND EAST OF PHOENIX.
UNSETTLED CONDITIONS APPEAR LIKELY THROUGH THE LATTER PART OF NEXT
WEEK...AND HIGH TEMPERATURES SHOULD STAY BELOW SEASONAL NORMALS
DURING THAT TIME.
STAY UP-TO-DATE ON THE LATEST FORECASTS BY LISTENING TO WEATHER RADIO
ON THE PUBLIC SERVICE BAND. MORE DETAILED INFORMATION IS AVAILABLE
FROM THE NATIONAL WEATHER SERVICE IN PHOENIX ON THE INTERNET AT
WEATHER.GOV/PHOENIX
CJB
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