Area Forecast Discussion
Issued by NWS Duluth, MN

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FXUS63 KDLH 172204
AFDDLH

Area Forecast Discussion
National Weather Service Duluth MN
404 PM CST Wed Jan 17 2018

.SHORT TERM...(This evening through Thursday)
Issued at 404 PM CST Wed Jan 17 2018

At 4 PM, sunny skies prevailed across the Northland. Temperatures
had jumped into the middle 30s in a few locations along the North
Shore, namely Two Harbors and Silver Bay. Temperatures elsewhere
ranged from the mid 20s to around 30 with southwest winds.

The focus for tonight continues to be the vigorous, compact,
shortwave moving into the region from the northwest. Water vapor
imagery shows this feature well across south central Canada. The
models are generally in agreement in bringing this system very
quickly through the Northland, with the best consensus on bringing
a quick shot of precipitation to the region later tonight and
Thursday morning. While the system will be quite strong, it will
be rather moisture-starved and fast moving. This should mean snow
accumulations of generally an inch or less, along with some patchy
freezing drizzle at times as well.

The system will move out of the region on Thursday, leaving
partial sunshine for the afternoon. High temperatures are expected
to be even warmer on Thursday, with most locations settling into
the 30s for daytime highs.

.LONG TERM...(Thursday night through Wednesday)
Issued at 404 PM CST Wed Jan 17 2018

The late week warmup for the Northland still looks to be on track.
The last push of warm air with 850 hPa temperatures of 8 to 11
degrees will arrive Thursday night into Friday. This will result in
surface temperatures in the upper 30s for most of the CWA. Some
western areas may reach 40 early Friday afternoon before a cold
front pushes through during the late afternoon hours. This clipper
system won`t have too much effect on the CWA, other than bringing in
some cooler air. There may be some freezing drizzle or sleet Friday
morning along the International Border, with perhaps some light
drizzle in the same areas ahead of the cold front, but most of the
activity will end up north of the border. Highs Saturday will still
be on the mild side with readings in the low to middle 30s.

The main concern in the long range continues to be the snow
potential for Sunday into Monday. The GFS, Euro and GEM continue to
show a Colorado Low moving from the Central Plains and into the
western Great Lakes and today`s 12z runs are no exception. This
latest run has shifted the storm track slightly to the north,
putting more of the Northland into the area of potential snowfall.
This northward shift also shifts the potential heaviest snowfall
into northwestern Wisconsin back into east-central and southwestern
Minnesota. However, more changes are expected until the system moves
onshore and enters into the upper-air network Friday evening.
Regardless, parts of the forecast area will see snow with this
system and the potential is there for heavier amounts. Another shot
of colder air will arrive behind this system, but temperatures look
to be pretty close to seasonal normals.

&&

.AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon)
Issued at 1148 AM CST Wed Jan 17 2018

VFR conditions will prevail through most of the TAF period. The
concern in the near term is low level wind shear with gusty winds
aloft. Current LLWS conditions will diminish shortly, but there
will be two more periods during the evening hours and again
towards daybreak where LLWS will be a concern at most sites. This
will improve by daybreak Thursday. CIGS will then begin to lower
to MVFR overnight for KINL, KHIB and perhaps KDLH as the next
clipper system begins to move through. Some freezing drizzle will
be possible during the early morning hours at KINL with some light
snow to follow after 6AM, which may lead to MVFR VSBYs.

&&

.PRELIMINARY POINT TEMPS/POPS...
DLH  18  33  22  37 /  40  60   0  10
INL  17  33  20  39 /  60  60  10  30
BRD  18  35  22  40 /  10  10   0   0
HYR  15  33  20  39 /  20  20   0   0
ASX  18  33  22  40 /  40  50   0  10

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
LS...None.
&&

$$

SHORT TERM...DAP
LONG TERM...JTS/BJH
AVIATION...BJH


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