Area Forecast Discussion
Issued by NWS Duluth, MN

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FXUS63 KDLH 241140
AFDDLH

Area Forecast Discussion
National Weather Service Duluth MN
640 AM CDT Wed May 24 2017

.SHORT TERM...(Today through Thursday)
Issued at 313 AM CDT Wed May 24 2017

A mid-level shortwave situated over southern Iowa this morning will
continue to dive to the south and east today, allowing a mid- to
upper-level ridge to develop from the west. There is a lingering
ribbon of positive vorticity advection in the 500 mb progs, which
will help to focus some small precipitation chances over a small
portion of northwest Wisconsin this afternoon, mainly over Price
county. Not expecting much in terms of accumulation from this
precipitation, as only light rain showers/sprinkles are expected.
Otherwise, once this PVA ribbon moves off to the east, drier
conditions will prevail through much of the day Thursday. Some areas
of fog are possible overnight tonight into Thursday morning,
especially from the Twin Ports and southeast across northwest
Wisconsin. Some of the guidance is a bit more aggressive on the fog
tonight, given the development of a low-level inversion as shown in
the NAM soundings. Favorable dewpoint depressions, along with light
winds, will create conditions suitable for fog development in these
areas.

Sfc low pressure center will slowly translate over the Ohio River
Valley today and Thursday, along with sfc high pressure over Hudson
Bay, Canada, maintaining a northeast flow over Lake Superior, so
temperatures will be cooler along the lake today and tomorrow, with
highs today into the lower to mid 50s along Lake Superior and into
the lower to mid 60s further inland. Temperatures inland should be a
bit warmer for Thursday compared to today as winds become more
southerly, with highs inland into the 60s, with some mid 50s still
expected along Lake Superior.

A mid-level shortwave trough will develop over the Intermountain
West and advance eastward over southern Saskatchewan and Manitoba
Canada tonight and Thursday, bringing another chance of rain
showers, from west to east across much of the area Thursday
afternoon and into the evening hours. Again, not expecting much of
accumulations through the afternoon. This precipitation looks to be
supported by a push of 850-700 mb warm air advection ahead of the
trough.

.LONG TERM...(Thursday night through Tuesday)
Issued at 313 AM CDT Wed May 24 2017

The extended period will be somewhat unsettled through Tuesday. At
this point, the models do not indicate any major storm systems but a
series of shortwaves will move through the forecast region,
keeping a chance of showers and occasional thunderstorms. A slow
moving low pressure area will move through southern Canada
spinning off the shortwaves through the weekend. There will be a
chance for thunderstorms Sunday and Monday afternoon as stronger
impulses move through the region. Temperatures will be at or a
little above normal through the extended forecast period.

&&

.AVIATION...(For the 12Z TAFS through 12Z Thursday morning)
Issued at 637 AM CDT Wed May 24 2017

VFR at all locations this morning except for at HYR where IFR
clouds heights are affecting the airport. The ceiling heights will
slowy increase this morning and will be VFR by midday. The rest of
the airports will be VFR today and tonight. There is a possibility
of fog Thursday morning lowering conditions to IFR at HYR.

&&

.PRELIMINARY POINT TEMPS/POPS...
DLH  57  39  60  45 /  10   0   0  40
INL  66  40  67  49 /   0   0  30  40
BRD  62  44  68  51 /   0   0  30  20
HYR  61  39  70  50 /  10   0  10  40
ASX  55  36  60  44 /  10   0   0  30

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...Freeze Warning until 8 AM CDT this morning for MNZ010-011-018.

LS...None.
&&

$$

SHORT TERM...JTS
LONG TERM...Stewart
AVIATION...Stewart


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