Area Forecast Discussion
Issued by NWS Duluth, MN

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FXUS63 KDLH 251203

Area Forecast Discussion
National Weather Service Duluth MN
703 AM CDT WED MAY 25 2016

.SHORT TERM...(Today through Thursday)
Issued at 334 AM CDT Wed May 25 2016

Significant S/W trof axis continues to lift slowly northeastward
across the Plains States early this morning, with widespread
thunderstorms extending from South Dakota to eastern Oklahoma.
Surface low pressure along the South Dakota/Nebraska border will
lift northward today/tonight, and as it does so, will allow the
injection of rich deep layer moisture and ongoing T-Storm activity
into the developing warm frontal boundary lying near the MPX/DLH
CWA border region. While timing of the onset of precip may be a
tad slower that previous forecasts, the net result later today and
into tonight will be a large area of rain and embedded T-Storms
lifting northeastward across almost all of the DLH CWA with precip
amounts from a half inch to an inch and a half.

Very stable marine layer that has already advected well inland to
the west will be rather hard to dislodge today as mid/high level
clouds will have already overspread the thin stratus/fog layer in
many place by sunrise. As a result, we expect it to be pretty hard
for the surface warm front to make too much progress to the north,
which should act to limit any severe T-Storm potential in the DLH
CWA, although a few stronger storms with roots above the shallow
stable layer are likely, with the primary threat of large hail.

Long fetch across the very cold spring waters of Lake Superior
should act to keep most areas near the lake, including the Twin
Ports area in the 50s today, with gusty east-northeast winds as
pressure falls are maintained to our west all day.

Primary precip area should lift northward tonight and gradually
diminish late tonight/Thursday morning near the Canadian border.
Although large scale subsidence will try to spread across the
region for Thursday, the presence of a lingering boundary, and
strong heating still supports at least a mention for
showers/T-Storms during the day, and some could be strong given
the deep layer shear in place, if storms were to form Thursday

.LONG TERM...(Thursday night through Tuesday)
Issued at 334 AM CDT Wed May 25 2016

An active pattern is shaping up across the Northland during the
long term abundant moisture continues to lift through
the central United States from the Gulf of Mexico. We are
expecting several rounds of showers and thunderstorms throughout
the period, with locally heavy rainfall and strong storms possible
at times. After the intense dry spell over the past couple of
weeks, things will transition rather dramatically. Thursday night
will offer the best chance for a bit of a break in precipitation,
as a weak area of surface high pressure combines with shortwave
ridging for a time. Will continue to carry a small pop across
mainly the south to southeast on Thursday Night. Some showers and
thunderstorms will also be possible on Friday as southerly flow
develops through the plains and Upper Midwest. Will raise pops to
the likely range across much of the south and southeast from
Friday into Friday Night.

Numerous showers and thunderstorms should develop later Friday
night, and spread across the entire CWA on Saturday, as a major
upper level trough swings into the Upper Midwest. Precipitation
should gradually decrease on Sunday from southwest to northeast.
Another reprieve is possible on Monday as upper level ridging
develops across the area, but another sizable shortwave is
expected to move in Tuesday into the middle of next week. High
temperatures will generally be in the 70s throughout the period,
although clouds and precipitation could keep some spots a bit
cooler at times. Overnight lows will generally be in the 50s.


.AVIATION...(For the 12Z TAFS through 12Z Thursday morning)
Issued at 700 AM CDT Wed May 25 2016

Areas of dense fog will persist across the head of the lakes
region for a time this morning. The aviation forecast for today is
quite tricky, as we are expecting some clearing of the low clouds
for a time today. At this time, it looks like the low clouds and
fog will linger longest at the KDLH site. Rain and thunderstorms
will then spread from southwest to northeast by late afternoon and
this evening. VLIFR/LIFR conditions will give way to MVFR or even
VFR by late morning. The low clouds and fog should redevelop as
the rain moves in later today and tonight.


DLH  56  50  65  52 /  80  80  30  30
INL  73  53  75  51 /  50  60  60  30
BRD  70  56  78  55 /  70  60  20  30
HYR  72  57  81  56 /  80  70  30  40
ASX  60  50  69  53 /  70  80  30  30


.DLH Watches/Warnings/Advisories...
LS...Dense Fog Advisory until 4 PM CDT this afternoon for LSZ121-

     Small Craft Advisory from 10 AM this morning to 4 AM CDT
     Thursday for LSZ121-142>148.



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