Area Forecast Discussion
Issued by NWS Burlington, VT

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
610 FXUS61 KBTV 231449 AFDBTV Area Forecast Discussion National Weather Service Burlington VT 949 AM EST Mon Jan 23 2017 .SYNOPSIS... A low pressure area will develop along the mid Atlantic coast today and will move slowly northeast and be just south of Cape Cod by early Tuesday night. This low pressure area will bring snow and sleet and some freezing rain to the north country late tonight and Tuesday. This low will then move northeast into the Canadian maritimes by Wednesday morning. && .NEAR TERM /THROUGH TUESDAY/... As of 939 AM EST Monday...Only very minor changes to the forecast today...to adjust for current trends in temps and clouds. Have also made some other adjustments to delay arrival time of precip tonight and placed more wintry mix into the grids...which has resulted in some decrease in storm total snowfall. Still an extremely complex and complicated forecast with regards to precip type and associated accumulations. NAM continues to support a warm layer around 5000 feet of 4 to 6c air...while cold layer around 2000 to 3000 feet is between -2c and -4c...supporting mostly sleet/freezing rain. Meanwhile...GFS cools the column associated with strong dynamics and supports mostly a snow event...with some light mix as steadier/heavier precip tapers off on Tuesday Afternoon. In our forecast we have taking the middle of the road approach using an ensemble model blend for thermal profiles and associated precip type. This supports a mixed bag of snow and sleet initially...with areas of freezing rain...especially toward Tuesday midday. Total snow/sleet accumulations of 2 to 6 inches is our current forecast with ice accumulation of one to two tenths possible...especially eastern/central vt...including the northeast Kingdom. Expecting the heaviest precip to occur right during the Tuesday morning commute...so an extremely hazardous morning commute is expected. Also...expect localized gusts between 30 and 40 mph along the southern Green Mountains from East Middlebury to Mt Holly late tonight into Tuesday. && .SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY/... As of 303 AM EST Monday...Stacked closed low pressure system off the southern coast of Long Island will gradually move north and east as associated trough and vorticity continues to affect the North Country Tuesday night into Wednesday morning. Colder air over Northern NY will result in mostly snow showers while eastern VT will continue to have warm layer aloft resulting in sleet or snow/sleet mix Tuesday night. Expect colder air to filter in on W to NW flow Wednesday morning as the surface low moves toward Gulf of Maine/Nova Scotia. Lingering upslope snow possible before ridging aloft provides a break in precip most of Wednesday. Snow/sleet accumulations of a dusting to 2 inches possible, with higher amounts in the mtns possible. Temperatures in the 20s Tuesday night will warm into the 30s on Wednesday. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... As of 303 AM EST Monday...Late Wednesday afternoon into Wednesday night, another area of surface low pressure will bring precipitation to the North Country. This low will be associated with 500mb shortwave with bulk of energy and moisture being to our south and east. Therefore, only expecting light rain and/or snow showers. Several more shortwaves move through the area as eastern North America remains under the influence of mid level trough. This will result in chance for snow showers throughout the remainder of the period. Temperatures will also trend cooler but remain above normal by about 5 degrees. && .AVIATION /15Z Monday THROUGH Friday/... Through 12z Tuesday...Ceilings across Vermont and northern New York this morning vary from mainly MVFR/VFR, to local pockets of IFR ceilings. Expecting mainly VFR/MVFR ceilings through 06Z Tuesday, as the region continues to have low level moisture trapped beneath an upper level ridge. Models have continued the trend of slowing the arrival of precipitation into the region from a low pressure area developing off the mid Atlantic coast, as upper level ridge over the region helping to slow the northward progression of precipitation from the low pressure area developing off the mid Atlantic coast. Expecting precipitation to start between 00z-06Z Tuesday across south central Vermont, with precipitation expected to start between 06Z-12Z Tuesday across northern Vermont and northern New York. A mix of snow, sleet, and freezing rain is possible across the region late tonight. Outlook 12z Tuesday through Friday...Expecting a wintry mix of precipitation to develop Monday evening and continue into Tuesday with the potential for moderate icing and major impacts to the aviation community. A mix of snow...sleet...and freezing rain is expected...with the heaviest precip occurring between 03z-15z Tuesday. Expect mvfr to ifr cigs/vis with periods of lifr vis in the heavier bursts of snow/sleet. Also...gusty southeast/east winds are likely at Rutland during this time period...with areas of wind shear and turbulence areawide associated with 925mb to 800mb winds of 50 to 60 knots. Improving conditions with lingering rain/snow showers on Weds into Thursday. && .BTV WATCHES/WARNINGS/ADVISORIES... VT...Winter Weather Advisory from 7 PM this evening to 10 PM EST Tuesday for VTZ001>012-016>019. NY...Winter Weather Advisory from 7 PM this evening to 10 PM EST Tuesday for NYZ026>031-034-035-087. && $$ SYNOPSIS...WGH NEAR TERM...Taber SHORT TERM...KGM LONG TERM...KGM AVIATION...WGH/Taber

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.