Area Forecast Discussion
Issued by NWS Grand Forks, ND

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467
FXUS63 KFGF 150548
AFDFGF

Area Forecast Discussion
National Weather Service Grand Forks ND
1148 PM CST Thu Dec 14 2017

.UPDATE...
Issued at 1148 PM CST Thu Dec 14 2017

Only a few minor tweaks to POPs as band of accumulating snow has
fallen apart and there are only a few flurries left. have POPs
diminishing a bit overnight before the next round arrives later
Friday morning.

&&

.SHORT TERM...(This evening through Friday)
Issued at 320 PM CST Thu Dec 14 2017

Expecting it to remain cloudy through the entire short term
period. Along with that, flurries or very light snow remain
possible throughout as well. Currently think more flurries will be
around early this evening. Then models indicate a little better
chances for light snow will develop by mid evening, mainly over
the Devils Lake region and northern Red River Valley. This
activity may expand further south and east after midnight.
However, really only talking about a dusting of snow with this.
Next system still on track for Friday into Friday night. This next
system brings most of the area some light snow, but the main band
looks to be from the northern Red River Valley over toward
Bemidji, where up to 2 to 3 inches of snow are possible. Lesser
amounts are expected to the west. Wind speeds do not look very
strong, which should lessen the impacts.

.LONG TERM...(Friday night through Thursday)
Issued at 320 PM CST Thu Dec 14 2017

Friday night and Saturday...Our northerly upper flow will
transition to zonal heading into the weekend. As this occurs deep
warm air advection snowfall should set up along a northwest-
southeast oriented baroclinic zone. The swath should cover a tract
from Devils Lake through the north and central valley to west
central Minnesota with little or nothing over SE ND. Upper level
support is lacking and there is the though that vigorous WAA will
trim some of the available ice to the point of a possible mix of
pcpn types, first over Devils Lake before propagating toward the
valley later Fri night. Nevertheless, still favoring SN as main
pcpn and sticking with the inherited 1 to 3 inch amounts. Impacts
should be diminished by the lack of wind during this event.
Forcing should be over by Saturday afternoon.

Sunday through Thursday...Zonal flow will likely persist much of
the week, with a stronger system likely affecting the region later
Mon and Mon night. The cyclone will likely move across Central
Canada while the surface and upper trough swings through the
forecast area dropping small snowfall amounts. But here the wind
will be stronger behind the front, possibly creating blowing snow
impacts. It appears that we`ll go more NW flow midweek as temps
drop to near and then below average values. Then a phasing trough
could make things more interesting later in the week, with the
early money on a more southern track, but we`ll have to keep an
eye on it with time.

&&

.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1148 PM CST Thu Dec 14 2017

MVFR to IFR ceilings across the area, with a few flurries
lingering at KBJI and KTVF. Ceilings will stay in the MVFR to IFR
category through most of the period. A band of snow will begin to
move into the northwestern forecast area by Friday morning,
spreading south and eastward. Heaviest part of the band looks to
be over the northern TAF sites, but even KFAR could see snow with
vis down into the 3-5SM range. The northern TAF sites could see
some 1-2SM late in the period with snow. Light and variable winds
will steady out of the southeast at less than 12 kts.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...None.
MN...None.
&&

$$

UPDATE...JR
SHORT TERM...Godon
LONG TERM...WJB
AVIATION...JR



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