Area Forecast Discussion
Issued by NWS Portland, ME

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347 FXUS61 KGYX 201330 AFDGYX Area Forecast Discussion National Weather Service Gray ME 930 AM EDT Mon Mar 20 2017 .SYNOPSIS... A ridge of High pressure will build east and crest across the region later today before weakening and sliding offshore. Dry and warmer weather can be expected today, with temperatures moderating to near or above normal for a change. The milder air will stick around through Tuesday before a cold frontal passage ushers well below normal temperatures back into the area for mid week. Low pressure may bring a mixed bag of precipitation over the weekend. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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930 AM...Forecast in good shape for today as temps climb to near or just above normal under sunny skies. Adjusted skies to zero cloud cover through this morning before thin cirrus begins to work in this afternoon. Also, made a few tweaks to temps based on current obs. Prev Disc... At 06z...a 1002 millibar ocean low was centered well southeast of Nova scotia. A 1028 millibar ridge was draped across the eastern CONUS. GOES infrared channels showed clear skies across the forecast area at moment. For today...the ocean low will gradually retreat further offshore allowing the surface ridge to slide east and crest across the forecast area towards evening. A mostly sunny day and moderating 850 millibar temperatures will allow the mercury to rebound to near average for the date with afternoon readings in the 40s...with a few 50 degree readings possible over southeast New Hampshire.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/... The ridge will weaken and retreat offshore tonight with clouds increasing overnight ahead of a weak shortwave impulse. On Tuesday...the weak impulse races across the area driving a surface trough/weak cold front across the area. This moisture starved boundary may touch off a few snow showers across the higher terrain...otherwise a partly cloudy day for the region with temperatures similar to today. && .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... Low pressure advancing eastward across southern Quebec Tuesday night will continue eastward Wednesday. The low will aid in dragging a strong cold front across the region Tuesday night into early Wednesday. While moisture will be limited, the ingredients for a few snow squalls will be in place as the cold front sweeps through. These snow showers and squalls will mainly affect the mountain zones but a few of them making it to the coastal plain is not out of the question. This cold frontal passage will set the stage for windy and below normal temperatures for Wednesday into Thursday. The next weather system possibly affects the forecast area Friday night through the weekend. This may involve a near- stationary or wavering frontal boundary which could bring a bout of mixed precipitation to our forecast area, especially in the north. && .AVIATION /14Z MONDAY THROUGH FRIDAY/... Short Term /through Tuesday/...VFR. Sct MVFR psb Tuesday in mtn -shsn. Long Term...Brief MVFR or lower conditions possible later Tuesday night and early Wednesday in snow showers as strong cold front moves across. Otherwise, VFR conditions are expected on Wednesday and Thursday with windy conditions. && .MARINE... Short Term /through Tuesday/...Small craft conditions continue will linger outside the bays into tonight and through late today in the bays. We should drop below small craft everywhere overnight into Tuesday as the ridge axis traverses the waters. Long Term...Gales will be possible Wednesday and Wednesday night in the wake of a cold front. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...Small Craft Advisory until 5 PM EDT this afternoon for ANZ151- 153. Small Craft Advisory until 8 AM EDT Tuesday for ANZ150-152-154. && $$ SYNOPSIS...Schwibs NEAR TERM...Cempa/Schwibs SHORT TERM... LONG TERM... AVIATION... MARINE... is the U.S. government's official web portal to all federal, state and local government web resources and services.