Area Forecast Discussion
Issued by NWS Portland, ME

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. --
000 FXUS61 KGYX 172042 AFDGYX Area Forecast Discussion National Weather Service Gray ME 342 PM EST Wed Jan 17 2018 .SYNOPSIS...
-- Changed Discussion --
Low pressure will depart the region this evening bringing the snow to an end. High pressure builds eastward into the region for the rest of the week and into the weekend with a return southwest flow bringing warmer temperatures by the weekend. A storm system may affect the region early next week with mixed precipitation and rain.
-- End Changed Discussion --
&& .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
-- Changed Discussion --
Low pressure will gradually move away from the region this evening bringing an end to the snow early on. Winter weather advisories are in effect for the southern half of NH until 7 pm with winter storm warnings and advisories continuing for portions of ME until that time also. A short wave trough will swing across northern New England late this afternoon and early evening allowing much the advisory and warning area to pick up an additional inch or two of snow. This will make the evening commute slippery in most areas. Some spotty freezing drizzle may occur as well for a short period of time early this evening, but that looks like a low probability at this time. Clearing is expected to occur in the wake of the short wave trough later tonight downwind of the mountains.
-- End Changed Discussion --
&& .SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
-- Changed Discussion --
Thursday looks to be a fair weather day with seasonable temperatures. However, the northern Whites and a portion of the western ME mountains will probably see upslope snow showers especially in the morning. Another short wave trough will cross the region Thursday night with an increase in clouds. Some snow showers may occur as well if the column moistens up sufficiently.
-- End Changed Discussion --
&& .LONG TERM /FRIDAY THROUGH WEDNESDAY/...
-- Changed Discussion --
Zonal flow will replace the trough which has been plaguing the East Coast by the end of the week. A more southwesterly warm air advection pattern develops for the weekend and into early next week as low pressure detaches and forms along the base of southern stream troughing over the southern and central plains. Weak upslope snow showers will be possible over the White mountains and the western Maine mountains Friday through Sunday with persistent but non-significant short wave energy passing by. Precipitation then spreads east with time on Monday into Tuesday. Coastal locations may see rain with the possibility of mixed wintry p-types as an eastward moving cold front brings lifting for ascent towards low pressure pivoting up the eastern seaboard. This will allow cooler air back in with temperatures dropping back towards normal values by next Wednesday.
-- End Changed Discussion --
&& .AVIATION /21Z WEDNESDAY THROUGH MONDAY/...
-- Changed Discussion --
Short Term /through Thursday night/...MVFR to IFR conditions early this evening in snow and low clouds will give way to VFR conditions after midnight tonight through Thursday. Long Term...Mainly VFR conditions across the region Friday through Sunday. There will be a chance of light mountains snow showers/MVFR ceilings for mainly HIE and possibly LEB during this time. Widespread lower ceilings and visibilities in possibly mixed wintry precipitation late Monday night as low pressure heads towards New England.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
Short Term /through Thursday Night/...Marginal SCA for seas remains in effect for the ocean waters for tonight into early Thursday morning. Long Term...Waves and winds increase to near SCA conditions late Friday into Saturday in gusty SW flow before dropping off once again.
-- End Changed Discussion --
&& .HYDROLOGY...
-- Changed Discussion --
River flood warning for the Kennebec has been reissued as jammed up ice has caused the river to rise just above flood stage again. It is expected to go below flood stage Thursday afternoon.
-- End Changed Discussion --
&& .GYX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
ME...Winter Weather Advisory until 7 PM EST this evening for MEZ012>014. Winter Storm Warning until 7 PM EST this evening for MEZ018>028. NH...Winter Weather Advisory until 7 PM EST this evening for NHZ003>015. MARINE...Small Craft Advisory for hazardous seas from 7 PM this evening to 7 AM EST Thursday for ANZ150-152-154.
-- End Changed Discussion --
&& $$ NEAR TERM...Ekster SHORT TERM...Ekster LONG TERM...Ekster/Hanes

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