These details are provided by the NWS offices in Gray Maine, and the surrounding NWS offices in New York, and Massachusetts.  I have modified some of the technical stuff to help make it more understandable for the average reader.

Last update: 8/15 - 5:04 PM

NEAR TERM /UNTIL 6 AM TUESDAY MORNING:
Visible satellite imagery this afternoon shows a widespread cumulus field across the region along with some high altitude cirrus streaming in from southwest to northeast across southern locations. A sea breeze is continuing to push inland and some scattered showers have developed along this boundary. Current temperatures across the area currently range from the upper 70s to lower 80s in most locations, and a few additional degrees of warming are possible through the remainder of the afternoon. A few additional showers may also develop, especially across the interior but most places will remain dry.

Any remaining showers will end by early this evening as we begin to lose daytime heating and skies will become clear to partly cloudy overnight. Low temperatures will range from the lower 50s across northern valley sites to the middle and upper 50s elsewhere. Patchy fog is also likely to develop overnight, especially across the valleys where temperatures cool to near their dew points as well across the coastal plain. The latest HREF(The High Resolution Ensemble Forecast) indicates high probabilities for fairly widespread fog across the coastal plain but given the recent dry conditions capped fog chances to mostly patchy.

SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT:
Morning fog will quickly burn off tomorrow morning by around 8-9 am leading to partly cloudy skies through the first half of the day. During the afternoon and evening, cloud cover will begin to increase some due to both diurnal heating along with the influence of an approaching area of low pressure that will be moving northward over the western Atlantic. Similar to today there could be an isolated to widely scattered shower during the afternoon but most locations will likely remain dry. High temperatures will range from the middle 70s across the north and mountains to the lower 80s in southern NH. A sea breeze is also likely to once again form during the second half of the day, capping temperatures behind it.

Skies will then become mostly cloudy Tuesday night as low pressure begins to approach the southern New England waters and there will be increasing chances for scattered showers after midnight, especially across eastern areas. The increase in moisture may also allow for the development of fog once again with overnight lows falling into the 50s across the north to the lower 60s along the coast.

LONG TERM /WEDNESDAY THROUGH MONDAY:
Models continue the trend for weak 500 MB closed low to our SW to get captured by weak trough to our North and allow for coastal low to develop to our South Tues night and eventually get captured and stack with the closed low somewhere nearby. However, it’s 2 days out and still no model consensus, with the GFS and ECMWF operational runs suddenly very different once again, as the Euro is further west and would mean rain spreading across entire forecast area, and maybe more wind, while the GFS would focus the most rain on eastern zones. Euro ensemble has been fairly consistent with a more easterly track, and will favor this /similar to the going forecast/ for now, but confidence is still low.

This means showers moving into the E zones Wed morning and spreading west during the day /although how far west is another question/. While in the evening, should see a steadier rain develop during the afternoon and continue into the evening at least, with some embedded heavier downpours. Highs a on Wed will depend a lot on when the rain begins and where it stays steady through the afternoon. In the ME mountains and E zones, highs will be limited to the mid to upper 60s, while in central and southern NH the highs will reach the low to mid 70s. Based on current forecast it`ll be breezy Wed into Wed night, especially near the coast but gusts should be limited to around 25 mph. Should the track to the west materialize, then we will see slightly stronger winds, but still sub advisory. Lows Wed night will generally be in the upper 50s to low 60s.

On Thursday, regardless of scenario we will be dealing with stacked system, that is weakening so if stays east, will see a threat of showers in the NE half of the forecast area, with some sun in the South, and highs upper 60s in the NE to around 80 in southern NH. If the system comes further west, more clouds and the threat of showers will shift into southern NH.

Friday through the weekend will see weak 500MB ridging transitioning to zonal flow, and generally surface high pressure, but the WSW flow will transport warmer air into the region with highs in the 80s Sat/Sun, possible reaching 90 on southern NH, especially Saturday.