Area Forecast Discussion
Issued by NWS Portland, ME

Current Version | Previous Version | Text Only | 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
-- Remove Highlighting --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KGYX 150817 AAA AFDGYX Area Forecast Discussion...UPDATED National Weather Service Gray ME 417 AM EDT Fri Sep 15 2017 .SYNOPSIS... Moisture associated with the remnants of Hurricane Irma will move through the region today bringing a few showers and possibly a thunderstorm. Beyond this...high pressure will build back into the region for the weekend through early next week bringing dry and mild conditions to the region. && .NEAR TERM /THROUGH TODAY/...
-- Changed Discussion --
417 AM Update... A quick update to add lightning back in as a few cells have intensified along a northward moving warm front. Also received a report of very heavy rainfall under one of the cells, so have added this to the forecast update as well. Previous discussion... A moist air mass associated with the remnants of Irma along with a stationary/warm front is supporting showers which are mainly situated across southern NH and SW Maine. Weak lift provided by cyclonic flow at the surface and aloft has kept this convection going. Lightning ended several hours ago...but as forcing increases this morning an isolated strike is not out of the question. Rain is not especially heavy at this time, but PWATs are on the increase with last night KGYX sounding showing 1.22" already. This has undoubtedly increased overnight with south winds encroaching at the coast. Fog and low stratus have developed where other cloud cover is not preventing radiational cooling. Cloud cover will likely prevent the need for a dense fog advisory...but there are areas of dense fog over NH. Temperatures are still quite warm and in the mid 50s north where there are some clear spots to the 70s closer to the coast. Expect skies to be partly sunny across the mountains and foothills during the day with a slight chance of a shower or thunderstorm. Along the coast, skies will remain mostly cloudy near the front with the continued chance of showers and an increasing possibility of isolated thunderstorms with heavy rain as the front shifts north and PWATs push into the +2 sigma range. Have included this wording in the worded forecast as any shower has the potential to cause localized flooding. Highs should reach the mid 70s to lower 80s.
-- End Changed Discussion --
&& .SHORT TERM /TONIGHT THROUGH 6 PM SATURDAY/... Ridging builds in farther from the SW and winds will be calm tonight. Cloud cover and showers will linger along the coast and offshore with the trough still over the Gulf of Maine and plenty of moisture around. Moisture will be around 150-175% of normal by mid day, when comparing the NAM to climatology. Therefore expect fog and stratus to be a bigger issue, with areas of dense fog on land and over the water alike. Very likely we may need a dense fog advisory late tonight into Saturday morning. Saturday temperatures will warm into the upper 70s to mid 80s...however it will be humid with almost no wind. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... && .AVIATION /07Z FRIDAY THROUGH TUESDAY/... Short Term... Areas of LIFR continue this morning are generally confined to southern NH and SW Maine. Elsewhere VFR conditions prevail with mid and high clouds preventing much fog development. Showers have been affecting the PSM/MHT/CON corridor last night and this morning and are moving very slowly. This has added to the low visibilities and clouds. RKD is also reporting -RA this morning but this is more transient in nature. This activity may eventually affect AUG or PWM this morning. Away from the coast expect improvement to VFR by late morning/early afternoon. More widespread shower and isolated thunderstorm activity is expected by this afternoon. Widespread dense fog sets in tonight with even more widespread IFR/LIFR restrictions. Long Term... High pressure builds into the region for the weekend and holds through next week resulting in VFR conditions through the middle of next week. && .MARINE...
-- Changed Discussion --
Short Term... No flags expected through Saturday with waves generally subsiding through tonight. Long Term... Quiet waters as high pressure builds into the region and hold through the start of next week. Tropical Storm Jose may pass through or just east of the Gulf of Maine in the middle of next week.
-- End Changed Discussion --
&& .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Hanes SHORT TERM...Hanes LONG TERM...Sinsabaugh

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