000 FXUS64 KHUN 110156 AAB AFDHUN AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE HUNTSVILLE AL 756 PM CST TUE DEC 10 2013 .UPDATE... MINOR ADJUSTMENTS TO SKY GRIDS TONIGHT AND WED...NO OTHER CHANGES WERE NEEDED. && .DISCUSSION... SURFACE HIGH PRESSURE SPRAWLED FROM THE SOUTHERN PLAINS TO THE MID MISSISSIPPI VALLEY CONTROLLED THE AREAS GENERAL WEATHER SITUATION. CLEAR SKIES PREVAILED ACROSS THE AREA THIS EVENING...WITH EARLY EVENING TEMPERATURES RANGING IN THE UPPER 20S TO MID 30S. THE SYSTEM THAT BROUGHT THE RAINS AND SOME WINTRY PRECIP TO THIS AREA LAST NIGHT CONTINUED TO MOVE RAPIDLY TO THE EAST...WITH ITS COLD FRONT NOW CLEAR OF MOST OF THE EAST COAST TO ACROSS CENTRAL FLORIDA. ANOTHER REINFORCING SHOT OF COLDER AIR WAS MOVING SOUTHWARD ACROSS THE NORTHERN PLAINS. THE COLD FRONT ASSOCIATED WITH THIS NEXT COLD SURGE WILL MOVE ACROSS THE AREA TOMORROW...KEEPING THE MID/LATTER PORTIONS OF THIS WEEK COOLER THAN USUAL SEASONAL NORMS. BEFORE THE NEXT FRONT PASSAGE TOMORROW...THE ABOVE MENTIONED AREA OF HIGH PRESSURE WILL CONTINUE DRY AND COOL CONDITIONS FOR THE OVERNIGHT. FORECAST LOWS IN THE LOW/MID 20S LOOK GOOD AT THIS TIME. GIVEN THAT CLEAR SKIES SHOULD CONTINUE TONIGHT...HAVE ADJUSTED GRIDS TO REFLECT CLEAR RATHER THAN MOSTLY CLEAR SKIES. A WEAK RETURN OF HIGH ALTITUDE SUBTROPICAL MOISTURE AND THE APPROACH OF THE FRONT SHOULD MAKE FOR A FEW MORE CLOUDS ON WED. OPTED FOR A MOSTLY SUNNY WORDING RATHER THAN PARTLY CLOUDY. THOSE UPDATES WILL BE OUT SHORTLY. RSB && .AVIATION... /ISSUED 544 PM CST TUE DEC 10 2013/ FOR 00Z TAFS... MARGINAL LOW LEVEL WIND SHEAR IS POSSIBLE INTO THE LATE EVENING...AS SURFACE HIGH PRESSURE BUILDS EASTWARD ACROSS THE AREA. A DRY COLD FRONT IS FORECAST TO MOVE ACROSS THE REGION DURING THE MIDDAY HOURS WED. GIVEN DRY CONDITIONS EITHER SIDE OF THIS NEXT BOUNDARY...NO WEATHER OF CONSEQUENCE IS EXPECTED. LIGHT WINDS OVERNIGHT WILL BECOME WESTERLY AROUND 5KT A FEW HOURS AFTER DAYBREAK WED...THEN NORTHERLY 5-10KT AFTER THE FRONT PASSES IN THE AFTERNOON. RSB && .PREV DISCUSSION... /ISSUED 109 PM CST TUE DEC 10 2013/ THE TENNESSEE VALLEY IS FINALLY SEEING SUNSHINE THIS AFTERNOON AFTER SEVERAL DAYS BENEATH EXTENSIVE CLOUD COVER THANKS TO THE H5 PATTERN ALOFT. THE LONGWAVE TROF THAT WAS IN PLACE ACROSS THE CENTRAL CONUS YESTERDAY HAS FINALLY SHIFTED EASTWARD INTO THE GREAT LAKES REGION, WITH THE BASE OF THE TROF HAVING ALREADY PUSHED THROUGH THE AREA THIS AFTERNOON (WITH A POCKET OF DRY AIR ALOFT SETTLING INTO THE REGION PER WV IMAGERY). THE SUBTROPICAL JET CONTINUES TO FUNNEL MOISTURE NORTHEASTWARD ACROSS THE SOUTHEAST, THOUGH, THANKFULLY THIS HAS SHIFTED SOUTH/EAST OF OUR LOCAL CWFA. HIGH PRESSURE AT THE SFC CONTINUES TO BUILD SUBSIDENCE INTO THE AREA FROM THE CENTRAL PLAINS, AS EVIDENT ON THE LATEST VISIBLE IMAGERY THIS AFTN. THE FORECAST FOR MUCH OF THE WEEK IS RELATIVELY STRAIGHTFORWARD AND IS GENERALLY COOL AND DRY UNTIL WE REACH THE WEEKEND. WITH THE CLEAR SKIES AND CALMING WINDS IN PLACE ACROSS THE AREA TONIGHT, RADIATIONAL COOLING WILL ALLOW FOR MORNING LOWS TO PLUMMET INTO THE LOWER TO MIDDLE 20S AS THE COLDER AIRMASS CONTINUES ADVECTING INTO THE AREA. A DRY COLD FRONT/REINFORCING SHOT OF COLD AIR WILL ARRIVE LATER IN THE DAY TOMORROW, MAKING FOR A COOLER DAY EXPECTED ACROSS THE AREA FOR THURSDAY. AFTER A COLD START IN THE UPPER TEENS/LOWER 20S, AFTN HIGHS WILL STRUGGLE TO REACH THE LOWER 40S IN MANY LOCATIONS THURSDAY AFTN. HAVE UNDERCUT GUIDANCE FOR THIS TIMEFRAME, BUT IT MAY NEED TO BE ADJUSTED DOWN ANOTHER DEGREE OR TWO TOMORROW. ITS ALSO WORTH NOTING THAT WINDCHILL VALUES THURSDAY MORNING WILL BE BETWEEN 10-15 DEGREES ACROSS THE AREA, WITH A FEW LOCATIONS POSSIBLY DIPPING BRIEFLY INTO THE SINGLE DIGITS IN SRN MIDDLE TN. OTHERWISE, THE NEXT CHANCE FOR RAINFALL ARRIVES LATE FRIDAY. THE CUTOFF UPPER LOW CHURNING OFF THE SOCAL COAST THIS AFTN WILL PHASE WITH ANOTHER SHORTWAVE DIVING SOUTHEASTWARD FROM THE PACNW. THIS WILL INDUCE SFC CYCLOGENESIS OVER THE TX/OK PANHANDLE REGION, WHICH WILL MEANDER EASTWARD THROUGH THE WEEKEND. THIS WILL TRANSLATE TO DRY WEATHER THROUGH MIDDAY FRIDAY FOR THE CWFA WITH ONLY A SLIGHT CHANCE FOR RAIN IN NW AL BEFORE SUNSET. THE BULK OF THE RAIN WILL ARRIVE AFTER THIS TIME AND SPREAD EASTWARD THROUGH MIDDAY SATURDAY BEFORE TAPERING OFF FROM WEST TO EAST OVERNIGHT SATURDAY INTO SUNDAY. POPS WERE ADJUSTED DURING THIS TIME FRAME TO SHOW THIS TREND. FOR NOW, AM NOT INCLUDING ANY RAIN/SNOW MIX FOR SAT NIGHT/SUNDAY MORN GIVEN THAT THE TEMPERATURES ARE TOO WARM TO INCLUDE IT THIS AFTERNOON. THIS TREND WILL NEED TO BE MONITORED THOUGH, AS ANY SHIFT IN TEMPERATURES COULD CHANGE THIS THINKING. HIGH PRESSURE THEN BUILDS BACK INTO THE AREA SUNDAY THROUGH MIDWEEK WITH HIGHS IN THE MIDDLE 40S AND LOWS IN THE MIDDLE 20S. 12 && .HUN WATCHES/WARNINGS/ADVISORIES... AL...NONE. TN...NONE. && $$ FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WEATHER.GOV/HUNTSVILLE.