Area Forecast Discussion
Issued by NWS Duluth, MN

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FXUS63 KDLH 251138
AFDDLH

Area Forecast Discussion
National Weather Service Duluth MN
638 AM CDT Tue Apr 25 2017

.SHORT TERM...(Today through Wednesday)
Issued at 431 AM CDT Tue Apr 25 2017

Confidence continues to increase in a possible winter storm
affecting portions of the region. Surface low pressure over the
Oklahoma Panhandle this morning will lift northeast to northern
Ontario by Wednesday evening. A wintry mix of rain, freezing rain,
sleet, and snow is likely over much of the Northland beginning
tonight. An inverted trough was located over north-central
Minnesota this morning with rain showers affecting much of the
Northland. The trough is expected to slide slowly eastward
shifting the focus for showers northeastward through this morning.
Most locations should experience a break in precipitation before
the next round moves in this afternoon and tonight. The surface
low is forecast to move from southwest Iowa and northwest Missouri
to northeast Iowa and southwest Wisconsin overnight. A nose of
warm air aloft will lift northward across Wisconsin and into the
Arrowhead. Southerly cold air advection near the surface will
lower temperatures below freezing beginning in the high terrain
along the North Shore and spreading across the remainder of the
Arrowhead and west to the Iron Range tonight. Temperatures will
dip below freezing near the Twin Ports and Cloquet eastward
through the high terrain of the South Shore by sunrise Wednesday
morning. Much of the Arrowhead has the potential for more than
one-quarter inch of ice accumulation, with lesser amounts expected
farther west and south. However, given continued variability in
the guidance solutions, the axis of heaviest freezing rain may
shift farther west or south with later updates. Have issued a
Winter Storm Watch for the areas most likely to see significant
ice accumulation. Should the warm nose be less intense than
forecast, much of that freezing rain would fall as sleet or snow
with significant snow accumulation possible. In either case,
difficult travel is expected tonight through Wednesday and
continuing into Thursday. Ice and snow amounts will be lower over
north-central and central Minnesota and our southern tier of
Wisconsin counties. Winter Weather Advisories may be needed later
today on the periphery of the watch.

.LONG TERM...(Wednesday night through Monday)
Issued at 431 AM CDT Tue Apr 25 2017

The late April storm will continue to affect the Northland
Wednesday night and Thursday, before gradually moving out of the
area during the latter portion of the work week. Freezing rain,
sleet, and snow will continue to be possible Wednesday night and
early Thursday. Given the wintry mix, travel could continue to be
hampered Wednesday night and Thursday. High pressure will build
into the Northland on Thursday and Friday, from west to east. This
area of high pressure should bring mainly dry conditions from
Friday into Saturday, but another major storm system is looking
more likely starting on Sunday. A major longwave trough is
expected to move out of the Rockies on Saturday, before ejecting
northeastward into the western Great Lakes on Sunday. Rain is
expected to move quickly into the Upper Midwest on Sunday, and
then change over to snow across portions of the region by Sunday
night. Some freezing rain or sleet will also be possible,
potentially hampering travel plans for the end of the weekend and
early in the upcoming work week. The ECMWF and GFS have come into
much better agreement concerning this storm system, although the
GFS is a bit further to the west and not as deep as the ECMWF. The
ECMWF is also a bit warmer than the GFS, adding further
complexity to expected precipitation types during this period.
While it is still way too early to determine any possible snow or
ice accumulations, this system definitely bears watching, as the
ECMWF drops the central pressure of this system to 980 mb.
Temperatures throughout the period will be highly variable, with
the warmest temperatures expected late in the week and into the
weekend. Still, temperatures are expected to be below normal.

&&

.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
Issued at 635 AM CDT Tue Apr 25 2017

A major late April storm system will affect the Northland
throughout the TAF period. While today should be generally quiet,
we will see widespread precipitation move in from the south during
the afternoon and evening. Forecast soundings indicate the
potential for a change over to sleet or freezing rain across much
of the region, especially in northeast Minnesota. As a result, we
have included the mention of sleet for most TAF sites. IFR
conditions will be common at KINL, while it should be VFR for most
other TAF sites today. By mid to late afternoon, we will see those
VFR conditions replaced by MVFR and even IFR CIG`s and VSBY`s as
precipitation rapidly spreads in from the south. Winds will also
be gusty from the north to northeast.

&&

.PRELIMINARY POINT TEMPS/POPS...
DLH  55  32  33  26 /  70 100  80  50
INL  37  24  31  24 /  30  60  70  50
BRD  52  32  36  27 /  70  90  80  40
HYR  64  36  39  30 /  70 100  80  50
ASX  60  34  35  29 /  80 100  90  60

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
WI...Winter Storm Watch from this evening through Thursday morning
     for WIZ001-002.

MN...Winter Storm Watch from this evening through Thursday morning
     for MNZ012-019>021-037.

LS...Gale Warning from 7 PM this evening to 4 PM CDT Wednesday for
     LSZ121-146>148.

     Gale Warning from 7 PM this evening to 10 AM CDT Wednesday for
     LSZ140>145.

     Small Craft Advisory until 10 AM CDT this morning for LSZ140>143.

&&

$$

SHORT TERM...Huyck
LONG TERM...DAP
AVIATION...DAP


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