RSS FeedsIssued by NWS Denver/Boulder, CO
000 FXUS65 KBOU 251002 AFDBOU AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 300 AM MST WED NOV 25 2009 .SHORT TERM...WATER VAPOR IMAGERY SHOWING A RAPIDLY MOVING DISTURBANCE DIGGING INTO THE CENTRAL PLAINS STATES THIS AM. THIS DISTURBANCE AND ASSOCIATED WEAK FRONT WILL BRUSH THE PLAINS OF NORTHEAST COLORADO THROUGH THE MORNING HOURS. THE FRONT IS JUST MOVING INTO NORTHEAST COLORADO ATTM AND STRATUS RAPIDLY DEVELOPING OVER NORTHERN SECTIONS OF THE PLAINS. REGIONAL RADARS SHOWING SOME LIGHT ECHOES ACROSS NEBRASKA AND KANSAS SO WILL MAINTAIN THE ISOLATED POPS ACROSS THE FAR NORTHEAST ZONES. MOST OF THE UPWARD VERTICAL VELOCITIES ARE ACROSS NEBRASKA AND KANSAS SO NOT MUCH LITTLE HELP FROM UPSTAIRS WITH THIS SYSTEM. APPEARS ENOUGH OF A SURFACE PRESSURE RISE TO RESULT IN FRONTAL PUSH ACROSS MUCH OF THE FRONT RANGE AND LOOKS LIKE WE WILL HAVE STRATUS THROUGH THE MID MORNING HOURS. THERE WILL BE RAPID IMPROVEMENT LATER THIS AM AND AFTERNOON AS THE SYSTEM MOVES INTO THE UPPER MID WEST BY LATE IN THE DAY. CLEARING SKIES EXPECTED ACROSS ALL LOCALES TONIGHT. .LONG TERM...A SUNNY AND WARM THANKSGIVING DAY CAN BE EXPECTED WITH AN UPPER LEVEL RIDGE SPREADING FROM THE GREAT BASIN INTO THE CENTRAL AND SOUTHERN ROCKIES. LIGHT WESTERLY FLOW ALOFT WILL HELP DOWNSLOPE WARMING...SO HIGHS SHOULD BE ABLE TO REACH 60F OR SLIGHTLY BETTER ACROSS THE PLAINS. EVEN WARMER TEMPERATURES CAN THEN BE EXPECTED FRIDAY AS THE RIDGE AXIS MOVES ACROSS COLORADO. 700 MB TEMPS WARM TO AROUND 6C AND AIRMASS IS VERY DRY PER CROSS SECTIONS SO FULL SUNSHINE IS EXPECTED. AS A RESULT...HAVE WARMED UP HIGHS SEVERAL DEGREES FOR FRIDAY. BY FRIDAY NIGHT...THE NEXT TROUGH WILL BEGIN TO IMPINGE ON COLORADO. THIS WILL ALLOW A COLD FRONT TO DROP SOUTHWARD ACROSS THE FORECAST AREA BY EARLY SATURDAY MORNING...AND USHER IN MUCH COOLER TEMPERATURES. MODELS STILL DIVERGE SIGNIFICANTLY ON THE EVOLUTION OF THE UPPER TROUGH AND HOW IT PHASES A STRONG BUNDLE OF ENERGY MOVING OFF THE PACIFIC INTO THE LEAD SOUTHWESTERN U.S. TROUGH. AT THIS TIME...MAIN THRUST OF ENERGY SEEN IN THE Q-G VERTICAL MOTION FIELDS DROPS NEARLY STRAIGHT SOUTH ACROSS THE DESERT. THIS WOULD NOT BRING MUCH PRECIP TO OUR FORECAST AREA...BUT WITH THE COLD ADVECTION AND FRONTAL PASSAGE CANT RULE OUT SOME LIGHT SNOW... ESPECIALLY IN THE MOUNTAINS. AFTER A BRIEF WARMUP MONDAY AND TUESDAY...THE NEXT TROUGH IS STILL SHAPING UP TO BRING ANOTHER SHOT OF COLDER AIR TO THE FORECAST AREA BY THE MIDDLE OF NEXT WEEK. && .AVIATION...WEAK SURFACE COLD FRONT TO PUSH SOUTHWARD THROUGH LOCAL AIRPORTS BETWEEN 11-13Z AS WINDS SHIFT N-NE BUT GENERALLY UNDER 15KT. STRATUS WILL DEVELOP QUICKLY THIS AM AND LOOKS LIKE CEILINGS COULD DROP BETWEEN 4000-5000 FT AGL AND RESULT IN SOME ILS APPROACHES THROUGH 15Z OR SO. CLEARING SKIES LATER THIS AM AND AFTERNOON. TYPICAL DRAINAGE WINDS EXPECTED FOR TONIGHT. && .BOU WATCHES/WARNINGS/ADVISORIES...NONE. $$ SWE/DBB
