Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 232353
AFDFGF

Area Forecast Discussion
National Weather Service Grand Forks ND
653 PM CDT Sun Apr 23 2017

.UPDATE...
Issued at 639 PM CDT Sun Apr 23 2017

Tweaked the band of higher pops a bit to line up better with
neighboring offices. Else no significant updates to the forecast
package. Aviation discussion updated below.

&&

.SHORT TERM...(This evening through Monday)
Issued at 240 PM CDT Sun Apr 23 2017

The main forecast challenges will be the lingering light snow
tonight and then dealing with the next system for mainly Monday
into Monday night. Currently have some light snow lingering along
and just north of the highway 2 corridor. Devils Lake has gotten
the brunt of this light snow this afternoon, but since it is
falling during the day hours, not as much is accumulating as it
could at night. Grand Forks is finally getting a light dusting of
snow accumulation in grassy areas, which Bemidji had earlier this
afternoon as well. The steadier snow has now ended at Bemidji and
any remaining light snow there is melting. This snow band
continues to fight the dry east-northeast flow. However the high
resolution models continue to linger this band into tonight,
slowly lifting it east-northeast. Meanwhile, there are really no
effects for most of the southern half of the FA, other than there
is still snow on the ground in the band that fell earlier today.

Other than the snow band that lifts up toward the Canadian border
tonight, most of the night will be quiet. The larger scale models
show an area of surface low pressure over central South Dakota by
12z Monday, lifting into north central MN by 06z Tuesday. This is
accompanied by a fairly decent short wave as well and
precipitable water values approaching one inch. Liquid pcpn values
from the models are all somewhere in the neighborhood of 0.25 to
0.75 inches over eastern ND up into northwest MN, so it appears
that fairly decent pcpn amounts will fall. Slightly warmer air
moves in with this system too, so most of it should fall as rain,
but for areas north of Devils Lake to along the Canadian border
could see a little light snow accumulation as well. Along with the
surface low passing from SW to NE through the area, a decent
southeast to northwest Monday high temperature gradient will also
occur.

.LONG TERM...(Monday night through Sunday)
Issued at 240 PM CDT Sun Apr 23 2017

Monday night through Tuesday...The upper trough will be pulling east
Monday night, with the inverted surface trough moving from our MN
counties off into the Great Lakes overnight. Best chances for wrap
around precip will be Monday evening so have highest POPs during
that period, but a few lingering snow or rain showers could continue
in the northeastern counties late Monday night into Tuesday morning.
There will be strong cold air advection behind the system, mostly as
precip is tapering off so have only light snow accumulations.
However, the front will drop most of the area below the freezing
mark Monday night with highs only in the upper 30s to mid 40s on
Tuesday. Even with precip tapering off it should be a raw and breezy
day.

Wednesday and Thursday...A weak upper low wobbles across the region
with variation between the models on how much precip clips our
eastern counties. Will continue to keep the 20-30 POPs going that
the blended solution has for us during the time period. Of more
certainty is the cooler than average temperatures with highs
continued in the upper 30s and 40s and lows below the freezing mark.

Friday through Sunday...The ECMWF and GFS agree on an active
pattern, but that is about all with timing of various shortwaves all
over the place. The GFS is more progressive with lead shortwaves but
the ECMWF is faster and further north with the main upper low
lifting into the Plains. Will continue to go with a blend of models
and keep some low to moderate POPs going for Saturday and Sunday,
hopefully refining as models converge on a solution in later runs.
Temperatures will be moderating from the very cool mid week period
but still will be below seasonal averages.

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 639 PM CDT Sun Apr 23 2017

Widespread MVFR CIGS and VSBYS in light snow and mist along and
north of Highway 200 corridor... with heaviest snow along and
east of a DVL-TVF line, between the GFK and GAF areas. Expect this
band to slowly lift northward and diminish from the west as the
evening progresses. Blayer flow from the east will persist through
the overnight. Overnight into Monday morning will see persistent
MVFR CIGS and patchy MVFR VSBYS with lingering slight snow or
mist. A mix of heavier rain and snow will develop across this area
through the forenoon on Monday. Winds should turn from the
southeast through midday.

Along and south of the Highway 200 corridor... expect mainly VFR
conds into the evening and overnight with scattered MVFR CIGS and
persistent easterly blayer flow. On Monday forenoon...a low
pressure center should into northeast SD and lift through
southeast ND during the midday. Expect mainly VFR conds with
scattered showers developing through the day and blayer flow
increasing from the southeast.

&&

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

$$

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


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