Area Forecast Discussion
Issued by NWS Portland, ME

Home | 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
FXUS61 KGYX 100210 AAB

Area Forecast Discussion...UPDATED
National Weather Service Gray ME
910 PM EST Sun Dec 9 2018

Cold but rather quiet weather will continue for much of the
week. A Canadian clipper system with an associated moisture
starved cold front will cross the area Wednesday accompanied by
scattered mainly mountain snow showers. Late week a large ridge
with clear skies will build over the area but move offshore by
late Friday. Over the weekend a storm system moving northeast
from the Gulf of Mexico with bring warmer and wet weather to the


Update...Minor tweaks to readings S of the cloud
cover continue to fall while they hold steady beneath the
overcast. Also seeing continued signs on radar of upslope snow
showers along and N of the mtns. Satellite difference products
showing two levels to cloud cover in the Nrn some
seeder-feeder snowfall is possible...and that is where the
higher snowfall totals are located in our forecast.

Previous discussion...Snow showers will begin to press eastward
and into the northern mountains of Maine and New Hampshire
towards sunset. Latest HRRR indicates that light precipitation
will slowly accumulate in this region by 23Z. Outside this
region, partly cloudy conditions can be expect, but still cold
with lows in the teens. Single numbers expected in the mountains
where cold air advection will yield H8 temperatures near -16C
by late tonight.


Dry and mainly clear conditions expected for Monday and Monday
night as a weak and narrow ridge of high pressure crests over
the region from Canada. Nearly full sunshine will allow for
readings to push the freezing mark over southern areas during
the day Monday.

With continuing mainly clear skies and light winds Monday night,
expect radiational cooling to dominate the region. This will
allow temperatures to fall to near zero in northern areas by
late at night. There may be some cloudiness entering far western
areas by dawn from the west as a weak area of low pressure, a
clipper type system, approaches from the Great Lakes region.


A Canadian clipper system with very limited moisture will move
through the northeast Tue night and Wed bringing scattered snow
showers mainly to the mountains. Behind the clipper another
shot of very cold air moves across the region late Wed into Wed
night with some gusty winds. By thu the high becomes centered
over the region with sunny crisp skies and calm winds. Fri the
high moves offshore allowing increasing mid/high WAA clouds from
the southwest. On Sat the system traveling along the Gulf of
Mexico states gets kicked to the northeast and approaches the
area with a strong waa pattern in advance. Rain is expected to
overspread the region Sat but may start as a mix in the mtns.

Models are all over the place with the system for the weekend
so some hedging will be involved.


Short Term...Mainly VFR conditions outside the mountains. Low
clouds and snow showers expected across the high terrain.

Long Term...Mainly VFR conditions.


Short Term...SCAs will remain in place for all areas tonight
outside Casco Bay. Winds to switch from the southwest to
northwest after the passage of a cold fropa tonight with gusty
winds expected.

Long Term...No flags. SCA conds may occur over the outer waters
late Wed into Wed evng.


MARINE...Small Craft Advisory until 6 AM EST Monday for ANZ150>152-154.



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