


Area Forecast Discussion
Issued by NWS Portland, ME
Issued by NWS Portland, ME
743 FXUS61 KGYX 091848 AFDGYX Area Forecast Discussion National Weather Service Gray ME 248 PM EDT Wed Jul 9 2025 .SYNOPSIS... Scattered showers will continue into Thursday as a frontal boundary waffles just south of the area, before clearing out by Friday. The Bermuda high will be in place through the weekend, supplying mostly dry and warm weather. The ridge breaks down for the start of the new work week, with a return of hit and miss showers and warming temperatures. && .NEAR TERM /THROUGH TONIGHT/... Scattered showers continue into the evening hours as a frontal boundary lingers near the area. Cooler air persists with an easterly flow, while western areas have warmed with more sunshine. Some scattered thunderstorms remain possible for this afternoon near the boundary with the warmer temperatures across western and parts of central New Hampshire. Increasing cloudiness returns tonight as the moist onshore flow continues. Patchy fog is also possible in areas that hold onto more clearing through the evening, but otherwise a developing low stratus deck looks more favored than fog. After mostly diminishing through the evening, more showers and isolated thunderstorms likely develop across southern New Hampshire through the overnight hours as a weak wave rides along the front to the south. These continue to spread northeastward through the predawn hours, likely reaching the Lakes Region of New Hampshire by sunrise. && .SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/... Tomorrow looks wetter overall than today, with more widespread showers and some scattered thunderstorms. After the bulk of the morning activity, storms likely develop again the afternoon across western areas where more sunshine and warmer temperatures are expected through the daytime. Highs likely warm into the upper 70s through the Connecticut River Valley, helping to fuel the afternoon storms, while low to mid 70s are expected elsewhere with more showery conditions. Showers diminish again tomorrow evening as the front presses a little further south of the area. Northern areas likely hold onto the scattered shower activity the longest as storms weaken and drift northeastward through the evening and early overnight hours. Temps cool a bit more tomorrow night, with lows generally expected to dip into the upper 50s to low 60s across the region. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... Key Takeaway:Typical summertime pattern expected over the long term. High pressure builds in over the weekend, followed up by a series of weak upper level systems that will push across the area bringing unsettled hit/miss weather through the rest of the work-week. Hit or miss showers possible, but no widespread rainmakers or otherwise significant weather anticipated at this time. High pressure will begin sliding into the region during the day on Friday as the front that brought showers and thunderstorms on Thursday departs eastwards off the coast. Orographic lift forced by westerly flow over the mountains may cause some scattered afternoon showers and thunderstorms but most of the coastal plains area should be relatively quiet. The 500 mb ridge and the subsequent surface high builds in further on Saturday and into Sunday likely bringing warm and dry conditions. Light flow could support sea fog development and will need to watch for any coastal impacts both Saturday and Sunday mornings. Into the latter parts of Sunday and beyond, the ridge breaks down with a more zonal flow developing. Subtle shortwaves in the 500 mb flow regime combined with typical summer-like moisture and diurnal instability could allow for more showers and thunderstorms to develop early next week. However, because of the subtleness of these features and our temporal proximity to the event, confidence is low at the timing of each wave. There is also a signal for the middle of next week for anomalously warm and humid conditions as another 500 mb ridge builds back into the region so will have to keep an eye on that as well. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... Short Term...VFR to MVFR ceilings lower to IFR with a low stratus deck at most terminals tonight. Scattered showers are possible at most terminals late tonight and into Thursday morning. The stratus deck will be slow to lift through the morning tomorrow, with MVFR possible by the early afternoon. Scattered showers and storms are possible at HIE and LEB tomorrow afternoon. Ceilings likely lower again to MVFR to IFR tomorrow night. Long Term...Quiet weather Friday into Sunday, with only an isolated threat of showers with reduced flight cats. Late night and early morning fog and stratus in the valleys and sea coast will also be possible. && .MARINE... Short Term...Conditions remain below SCA levels as a stalled front lingers south of the waters. Areas of fog continue to bring reduced visibility through at least Thursday. Long Term...Expect similar to above through the weekend and much of the work week. There will be a slight downward trend in the winds over the weekend with the surface high overhead. Waves primary SSE swells and winds for the majority of the forecast, with no significant periods above 8 seconds expected. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ SYNOPSIS...Jamison NEAR TERM...Clair LONG TERM...Venarsky