Area Forecast Discussion
Issued by NWS Burlington, VT

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000 FXUS61 KBTV 201806 AFDBTV AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BURLINGTON VT 106 PM EST SAT DEC 20 2014 .SYNOPSIS... SURFACE HIGH PRESSURE ACROSS THE GREAT LAKES REGION WILL BUILD SLOWLY EASTWARD THROUGH THE WEEKEND BRINGING GENERALLY DRY WEATHER CONDITIONS. THE NEXT SIGNIFICANT STORM SYSTEM ARRIVES FOR CHRISTMAS EVE WITH VERY WINDY AND MILD CONDITIONS. PERIODS OF MODERATE TO BRIEFLY HEAVY RAIN ARE EXPECTED LATE CHRISTMAS EVE DAY INTO CHRISTMAS EVE NIGHT. THIS WILL BE FOLLOWED BY BRISK AND SOMEWHAT COLDER CONDITIONS DURING CHRISTMAS DAY WITH SNOW SHOWERS POSSIBLE...ESPECIALLY ACROSS THE HIGHER TERRAIN. && .NEAR TERM /UNTIL 7 PM THIS EVENING/... AS OF 1200 PM EST SATURDAY...JUST A FEW TWEAKS TO THE SKY GRIDS WITH PERSIST AREA OF CLOUDS OVER EASTERN CLINTON COUNTY...WHICH SHOULD EVENTUALLY ERODE AS THE AFTERNOON WEARS ON. OTHERWISE... KEPT ALL OTHER AREAS CLEAR FOR THE REST OF THE AFTERNOON. REST OF FORECAST REMAINS UNCHANGED. && .SHORT TERM /7 PM THIS EVENING THROUGH MONDAY/... AS OF 315 AM EST SATURDAY...MORE OF THE SAME FOR THE REST OF THE SHORT TERM FORECAST WITH SURFACE HIGH REMAINING OVER THE AREA THROUGH MONDAY. DRY WEATHER WITH LIGHT WINDS WILL BE THE MAIN STORY. SOME VORTICITY ADVECTION WILL BRING CLOUDS TO THE AREA SUNDAY. TEMPERATURES WILL BE BELOW NORMAL THROUGH THE PERIOD. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... AS OF 340 AM EST SATURDAY...LONGER RANGE DATA STILL SUPPORTS THE IDEA OF RAINY AND WINDY CONDITIONS ON CHRISTMAS EVE DAY AND NIGHT. EXTENDED PORTION OF THE FORECAST STARTS OFF ON A RATHER QUIET NOTE AS HIGH PRESSURE RETREATS INTO CANADIAN MARITIMES MONDAY NIGHT INTO TUESDAY. WEAK DISTURBANCE IN FLOW ALOFT COMBINED WITH INCREASE IN MOISTURE AS LOW LEVEL FLOW BECOMES MORE EASTERLY WILL RESULT IN CLOUDS AND A CHANCE OF SNOW OR RAIN SHOWERS ON TUESDAY WITH HIGH TEMPS IN THE 30S. PRECIPITATION CHANCES INCREASE TUESDAY NIGHT AND ESPECIALLY ON WEDNESDAY INTO WEDNESDAY NIGHT. DEEP UPPER TROUGH DEVELOPS OVER THE MIDWEST AND EVOLVES INTO VERTICALLY STACKED LOW OVER THE CENTRAL GREAT LAKES WEDNESDAY. SIGNIFICANT PIECE OF ENERGY ROUNDING BASE OF THIS TROUGH TUESDAY NIGHT WILL RESULT IN UPPER TROUGH TAKING ON NEGATIVE TILT DURING WEDNESDAY. THIS WILL LEAD TO GOOD INFLUX OF MOISTURE INTO THE REGION...DRIVEN BY INCREASING 850 MB JET WHICH MAY REACH 50-60 KNOTS LATER WEDNESDAY. WILL NEED TO KEEP AN EYE ON THE WIND SITUATION WITH THESE STRONG WINDS ALOFT...ESPECIALLY OVER THE HIGHER TERRAIN AND ALONG THE WESTERN SLOPES. THESE WINDS COULD HAVE AN IMPACT ON UTILITIES. ONE TO TWO INCHES OF RAIN IS EXPECTED WITH THIS SYSTEM. AMOUNTS MAY VARY QUITE A BIT HOWEVER DUE SHADOWING IN SOME AREAS AND OROGRAPHIC ENHANCEMENT IN OTHERS...ESPECIALLY ON SOUTHEAST FACING SLOPES OF SOUTHERN GREENS AND ADIRONDACKS. THE COMBINATION OF RAIN AND MILD TEMPERATURES WILL CAUSE SIGNIFICANT SNOWMELT. THIS COMBINATION OF SNOWMELT AND RAINFALL WILL CAUSE RIVERS TO RISE AND FLOOD THREAT WILL NEED TO BE MONITORED AS WELL. DRY SLOT MOVES IN CHRISTMAS DAY AND BY THE TIME COLDER AIR MOVES IN...THE BULK OF THE PRECIPITATION WILL BE OUT OF THE AREA. BEST CHANCE FOR SEEING SOME SNOW SHOWERS ON CHRISTMAS DAY WILL BE OVER THE ADIRONDACKS AND NORTHERN GREENS. MAX TEMPS WILL BE IN THE 30S TO AROUND 40. SOUTHWEST FLOW CONTINUES FRIDAY. EXPECT LITTLE CHANGE WITH CHANCE MOUNTAIN SNOW SHOWERS AND TEMPS MAINLY IN THE 30S. && .AVIATION /18Z SATURDAY THROUGH THURSDAY/...
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THROUGH 18Z SUNDAY...A SOLID CLOUD DECK FORMED ON THE WESTERN EDGE OF LAKE CHAMPLAIN AND HAS KEPT KPBG UNDER LOW OVERCAST MVFR CEILINGS THIS MORNING AND ON VIS SATELLITE IT APPEARS THAT THE CLOUD DECK IS BEGINNING TO SHOW SIGNS OF SLIDING NORTH. MID LEVEL CLOUDS WILL BEGIN MOVING IN SLOWLY THIS EVENING AND WITH SOME LIGHT SUBSIDENCE A LOW STRATUS DECK WILL LIKELY FORM OVERNIGHT. AS THE STRATUS DECK FORMS THERE WILL BE SOME LIKE GROUND FOG POSSIBLE MAINLY OVER THE WESTERN NY SITES AND MVFR VISIBILITIES WILL BE LIKELY. THROUGHOUT THE FORECAST PERIOD WINDS WILL REMAIN LIGHT AND VARIABLE. OUTLOOK 18Z SUNDAY THROUGH WEDNESDAY... 18Z SUN-00Z TUE...SOME PERIODS OF MVFR CEILINGS WITH AREAS OF LOW CLOUDS...OTHERWISE MAINLY VFR CONDITIONS UNDER HIGH PRESSURE. 00Z TUE-12Z WED...PERIODS OF MVFR IN LIGHT MIXED PRECIPITATION. 12Z WED-00Z THU...PERIODS OF MVFR/IFR IN RAIN. GUSTY WINDS POSSIBLE.
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&& .BTV WATCHES/WARNINGS/ADVISORIES... VT...NONE. NY...NONE. && $$ SYNOPSIS...NEILES NEAR TERM...EVENSON SHORT TERM...NEILES LONG TERM...RJS AVIATION...RJS/DEAL

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