Area Forecast Discussion
Issued by NWS Portland, ME

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
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. --
638 FXUS61 KGYX 201823 AFDGYX Area Forecast Discussion National Weather Service Gray ME 223 PM EDT Wed Jun 20 2018 .SYNOPSIS... A cold front will drop south across the region tonight into Thursday. This front may bring widely scattered showers, mainly in the north. Otherwise, high pressure builds in Thursday night and Friday with fair weather. Low pressure approaches from the west early on Saturday with the potential for showers and perhaps thunder Saturday afternoon through Sunday night. High pressure then builds in later Monday into Tuesday. && .NEAR TERM /THROUGH TONIGHT/... We`ll be sandwiched in between two systems tonight. The first, a cold front dropping in from the north may bring a few showers to northern zones tonight while low pressure moving south of New England remains far enough south to keep southern zones dry. The net result for much of the forecast area will be an increase in clouds. Lows will be in the 40s well north with 50s pretty much everywhere else. && .SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/... A lingering inverted trof across southern and central zones may bring a couple of light showers or sprinkles for the first part of Thursday but the vast majority of the forecast area will be dry. High pressure then builds in Thursday night with dry air and diminishing winds. This will result in good radiational cooling conditions later Thursday night allowing for temperatures to drop well down into the 40s at the better radiators, and possibly upper 30s across the far north. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... The deterministic model solutions are in decent agreement on the long wave pattern through late next week. an upper trough lifts out as we begin the forecast period with a flattening ridge for Friday and the start of the upcoming weekend bringing dry weather and warmer temperatures. By late Saturday...a shortwave impulse from the midwest will approach the region. At the surface...low pressure over the lower Great Lakes will track down the Saint Lawrence valley pushing a warm front northward into the area with clouds and an increasing chance of showers and scattered thunderstorms. The trailing cold front will cross the forecast area on Sunday accompanied by a second round of convection. Meanwhile...shortwave energy along the U.S. Canadian border will carve out another trough across the Great Lakes and northeast CONUS that will slide quickly eastward. This trough will drive a second cold front across the area with a few showers and thunderstorms Sunday Night and Monday. In the wake of this trough...rising heights under building high pressure surface and aloft with warm dry weather for Tuesday and Wednesday. By late Thursday into Friday...the next shortwave impulse and an associated frontal system will approach from the Great Lakes. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... Short Term...VFR conditions are expected tonight through Thursday. Winds will shift to the north later tonight or early Thursday morning as a cold front passes through the region, then from the east Thursday afternoon. Long Term... Sat Night - Sun...Areas of MVFR in shra/-tsra with lcl IFR in fog. Mon...Sct MVFR in -shra/-tsra. && .MARINE... Short Term...Winds and seas will remain below SCA thresholds tonight through Thursday night. Long Term... Mon...SCA`s are psb outside the bays. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Ekster SHORT TERM...Ekster LONG TERM...Schwibs is the U.S. government's official web portal to all federal, state and local government web resources and services.