National Weather Service Tucson Arizona
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. && .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. && .AVIATION...FOR THE 12Z PACKAGE...EXPECT VFR CONDITIONS AND MOSTLY CLEAR SKIES OVER THE NEXT 24 HOURS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. &&
PUBLIC.................TC AVIATION...............DJO VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
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