FXUS65 KBOU 262113
AFDBOU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
215 PM MST SAT DEC 26 2009

.SHORT TERM...A WEAKENING OF BOTH THE NORTHERLY FLOW ALOFT AND THE 
SURFACE PRESSURE GRADIENT WILL ALLOW FOR CONDITIONS TO CONTINUE TO 
IMPROVE OVERNIGHT. RADAR STILL INDICATES SOME LIGHT SNOW OVER PARTS 
OF THE NERN PLAINS THIS AFTN.  WL KEEP ISOLD POPS IN THE MTNS AND 
NERN PLAINS THROUGH THIS EVENING...WITH DRY CONDITIONS ELSEWHERE.  
ALTHOUGH VISIBILITIES HAVE IMPROVED OVER THE NERN PLAINS THIS 
AFTN...WL ALLOW FOR WINTER WEATHER ADVSY TO CONTINUE UNTIL 
00Z...MAINLY DUE TO THE IMPACT OF BLOWING/DRIFTING SNOW ON THE 
ROADWAYS.  MDLS KEEP A NWLY FLOW OVER CO ON SUNDAY. AN OMEGA RIDGE 
STRETCHES FM THE FOUR CORNERS REGION NORTH INTO CANADA...WITH 
DEFORMATION ZONES JUST TO THE NORTH OF CO.  ASIDE FM SOME HIGH LEVEL 
CLOUDINESS ON SUNDAY...THE OVERALL AIRMASS WILL REMAIN SUBSIDENT AT 
THE SURFACE AND ALOFT.  ONLY MINOR TEMPERATURES ADJUSTMENTS PLANNED 
FOR SUNDAY/S GRIDS.   

.LONG TERM...FLOW ALOFT WILL BE WEAK SUNDAY NIGHT AS THE STRONG 
UPPER LEVEL LOW MOVES OVER THE NORTHEAST U.S. SOME MOISTURE LINGERS 
OVER THE MOUNTAINS AND MAY PRODUCE A FEW FLURRIES AT MOST. MONDAY 
AND MONDAY NIGHT APPEAR DRY EVERYWHERE AS A WEAK RIDGE RESIDES OVER 
INTERMOUNTAIN WEST. BROAD TROUGH MOVES ACROSS THE SOUTHERN U.S. AND 
MEXICO TUESDAY AND TUESDAY NIGHT. THIS WILL BRING A LIGHT WESTERLY 
FLOW ALOFT AND SOME MOISTURE TO THE MOUNTAINS. WILL HAVE A SLIGHT 
CHANCE FOR SNOW FOR THIS. FLOW ALOFT WILL INCREASE AND SHIFT 
NORTHWEST WEDNESDAY WHILE THE MOISTURE STAYS ABOUT THE SAME. EXPECT 
A LITTLE MORE SNOW WEDNESDAY DUE TO THE BETTER OROGRAPHIC FLOW. 
TEMPERATURES ACROSS THE PLAINS AND URBAN CORRIDOR WILL STAY SLIGHTLY 
BELOW NORMAL TUESDAY AND WEDNESDAY.

THURSDAY THROUGH SATURDAY...NORTHWEST FLOW ALOFT WILL PREVAIL AS A 
RIDGE BUILDS OVER THE WESTERN U.S. AND A TROUGH MOVES SOUTHEAST OVER 
THE EASTERN HALF OF THE COUNTRY. THIS WILL KEEP DRY AND SEMI-COOL 
CONDITIONS OVER THE LOWER ELEVATIONS. FOR THE MOUNTAINS THE CHANCE 
FOR OROGRAPHIC SNOW WILL CONTINUE DUE TO THE SOMEWHAT MOIST 
NORTHWEST FLOW ALOFT. NOT SEEING ANY WELL DEFINED SYSTEMS EMBEDDED 
IN THE FLOW ALOFT...THUS SNOW AMOUNTS SHOULD STAY ON THE LIGHT SIDE. 

&&

.AVIATION...VFR CONDITIONS CAN BE EXPECTED OVER THE NEXT 24 HRS WITH 
            NO RESTRICTIONS TO CIGS/VSBYS.  INSTBY SHOWERS SHOULD    
            DIMINISH AFTER 00Z WITH NWLY WINDS TRANSITIONING TO      
            DRAINAGE AFTER 01Z.  
&&

.BOU WATCHES/WARNINGS/ADVISORIES...WINTER WEATHER ADVISORY FOR THE   
      NORTHEAST COLORADO PLAINS THROUGH 5 PM MST THIS AFTN...ZONES   
      42..44..45..46..48..49..50..51.

$$
COOPER/MEIER