Area Forecast Discussion
Issued by NWS Portland, ME-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
FXUS61 KGYX 061737
Area Forecast Discussion
National Weather Service Gray ME
1237 PM EST Tue Dec 6 2016
High pressure builds over the area today. A weak trough of low
pressure approaches from the west Wednesday morning with more
light snow possible. A cold front arrives from the northwest on
Friday ushering in some of the coldest air of the season so far
for this weekend.
.NEAR TERM /TONIGHT/...
-- Changed Discussion --1230PM UPDATE...
Temperatures have warmed just a few degrees warmer than forecast
across southern NH and the coastal plain of Maine, and have
updated the forecast accordingly. Clouds still holding tough in
the mountains, keeping temperatures down there.
Clouds still hanging tough in the mountains and will likely take
a few hours to dissipate. Have updated the sky cover forecast to
adjust for this. Also updated based on latest temperature and
dewpoint observations. Otherwise no significant changes to the
forecast were needed.
642 AM UPDATE...
Just a quick update to adjust for low temperatures across the
region due to radiational cooling in some locations. Also, clouds
persist in the mountains and over western sections near the CT
River Valley. Have removed most of the fog from the forecast as
An SPS remains in effect for early morning slick spots due to
refreezing of ice, especially on secondary roads. Otherwise clouds
will slowly dissipate over the mountains where a favorable upslope
flow continues. Low clouds persist in the CT River Valley as well.
Lowered overnight mins last night as radiational cooling took hold
in areas such as IZG. SFM dropped down to 10 degrees during the
Increasing sunshine can be expected where clouds persist. Nearly
full sunshine will allow temperatures to climb into the 30s in
most areas with near 40 over southern NH.
Increasing high thin clouds expected later in the afternoon as a
weak system approaches from the southwest.
-- End Changed Discussion --
.SHORT TERM /TONIGHT AND WEDNESDAY/...
Clouds thicken and lower tonight as low pressure exits off the
Mid Atlantic seaboard and a cold front approaches from the west.
This front will be relatively moisture starved, however some very
light snow will break out by Wednesday morning over southwest NH.
Relatively low pops due to the lack of dynamics and moisture on
Nevertheless, areas that do pick up snow in southern NH will lead
to locally slick driving conditions in and around the time of the
morning commute once again. However, an inch or less snowfall is
expected, mainly over NH and far western Maine by the time the
precip ends later Wednesday morning.
A southwest flow aloft will bring drier air into the region by
later in the day Wednesday. Temperatures will respond with
readings in the 30s, with even some lower 40s over far southern
.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
A broad upper trough over the Great Lakes will move east into New
England Thursday and Friday bringing scattered snow showers mainly
to the mountains. This trough exits to the east over the weekend.
Much colder arctic air moves into the region behind this trough
late Friday and into the weekend. The coldest temperatures of the
season can be expected over the weekend with dry conditions as the
Canadian ridge of high pressure settles over the area. High
temperatures Saturday will only reach the teens and 20s. Strong
radiational cooling due to clear skies and calm winds will make
overnight lows Saturday night fall into the single numbers to
By late in the weekend time frame around Sunday night an
approaching upper trough moves across the Great Lakes and may
spread some warm air advection light snow across the area. Models
generally agree on timing.
.AVIATION /14Z TUESDAY THROUGH SATURDAY/...
Short Term...Low clouds continue to be persistent over the
mountains where upslope conditions persist and in the Connecticut
River Valley. Just about all of the fog has dissipated.
Long Term...A northwest flow will allow for scattered mountain
snow showers through the weekend. VFR conditions except MVFR at
times at KHIE.
Short Term...Some gusts approaching SCAs early this morning
followed by a relaxation in the gradient. Winds/seas to remain
below SCA criteria thereafter in the near/short term.
Long Term...A cold west to northwest flow will persist through the
weekend. SCA winds are expected to develop Friday and into the
NEAR TERM UPDATE...Kimble