AREA FORECAST DISCUSSION

 
 FXUS65 KFGZ 241021
 AFDFGZ
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE FLAGSTAFF AZ
 315 AM MST TUE NOV 24 2009
 
 .SYNOPSIS...NORTHERN ARIZONA WILL CONTINUE TO SEE MOSTLY SUNNY AND 
 GENERALLY MILD DAYS WITH COLD...CLEAR NIGHTS...THROUGH THE END OF 
 THIS WEEK. A COLD FRONT WILL AFFECT THE REGION BY THIS COMING 
 WEEKEND WITH MUCH COLDER TEMPERATURES AND BREEZY CONDITIONS.
 
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 .DISCUSSION...UPPER LEVEL HIGH PRESSURE OVER THE WEST WILL CONTINUE 
 TO BRING MOSTLY SUNNY SKIES AND ABOVE NORMAL TEMPERATURES THROUGH 
 THANKSGIVING.
 
 THE FIRST IN A SERIES OF UPPER LEVEL WEATHER DISTURBANCES IS 
 FORECAST TO MOVE SOUTHEAST FROM THE NORTHWEST U.S. INTO THE CENTRAL 
 ROCKIES OF COLORADO FRIDAY INTO SUNDAY...WITH THE STRONGEST SYSTEM 
 OVER THE NORTHEAST PLATEAUS OF ARIZONA BY SUNDAY MORNING. LATEST 
 MODEL TRENDS HAVE BEEN TO BRING THE UPPER LEVEL LOW FURTHER 
 SOUTHWEST INTO ARIZONA...WITH SOME LIGHT PRECIPITATION OVER THE 
 NORTHERN FORECAST ZONES FROM THE KAIBAB PLATEAU INTO THE NORTHEAST 
 PLATEAUS. MODEL GUIDANCE HAS BEEN TRENDING SUNDAY`S HIGH 
 TEMPERATURES COLDER WITH EACH RUN...WITH LATEST GUIDANCE HAVING HIGH 
 TEMPERATURES IN THE MID 30S IN THE MOUNTAINS TO MID 40S IN THE LOWER 
 VALLEYS. 
 
 FOR NEXT WEEK...THE HIGH PRESSURE RIDGE IS FORECAST TO REMAIN 
 POSITIONED OFF THE WEST COAST...LEAVING NORTHERN ARIZONA BETWEEN AN 
 UPPER LEVEL HIGH PRESSURE RIDGE TO THE WEST WITH A LOW PRESSURE 
 TROUGH IN THE CENTRAL U.S. WEATHER DISTURBANCES ARE FORECAST TO MOVE 
 SOUTH FROM THE PACIFIC NORTHWEST AND DROP SOUTHEAST IN THE CENTRAL 
 ROCKIES OF COLORADO UNDER THIS FLOW PATTERN. NORTHERN ARIZONA IS 
 FORECAST TO BE COOL AND DRY...WITH FORECAST HIGH TEMPERATURES 
 NEAR SEASONAL NORMALS FOR THIS TIME OF THE YEAR. 
 
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 .AVIATION...FOR THE 12Z PACKAGE...EXPECT VFR CONDITIONS AND MOSTLY 
 CLEAR SKIES OVER THE NEXT 24 HOURS. AVIATION DISCUSSION NOT UPDATED 
 FOR AMENDMENTS.
 
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 .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. 
 
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 PUBLIC.................TC
 AVIATION...............DJO
 
 VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
 
 
 
 
 

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