Great Lakes Forecast
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FZUS63 KMQT 220153
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
953 PM EDT Thu Sep 21 2017

For waters beyond five nautical miles of shore on Lake Superior

Waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. Occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.SYNOPSIS...Lake Superior will remain situated between a 30.1
inch ridge across the Ohio Valley and a 29.6 inch trough over the
Upper Mississippi Valley through Saturday. The trough will stall
just west of Lake Superior Sunday and Monday while gradually
weakening to 29.9 inches.

LSZ162-221000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
953 PM EDT Thu Sep 21 2017 /853 PM CDT Thu Sep 21 2017/

.REST OF TONIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering south late. Patchy fog. A
chance of showers and thunderstorms. Waves 2 to 4 feet building
to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to
2 feet.
.FRIDAY...South winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
Patchy fog. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots veering southwest late.
A chance of showers and thunderstorms. Waves building to 1 to
3 feet.
.SATURDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots backing northeast
after midnight. A chance of showers through midnight. Showers
likely after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. A chance of showers. Waves
building to 2 to 4 feet.

$$

LSZ263-221000-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
953 PM EDT Thu Sep 21 2017

.REST OF TONIGHT...East winds 5 to 15 knots veering south late.
Patchy fog. A chance of showers and thunderstorms. Waves 2 to
4 feet subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
Patchy fog. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots becoming south 10 to
20 knots after midnight. A chance of showers and thunderstorms.
Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. A chance of showers
through midnight. Showers likely after midnight. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering southeast. A
chance of showers. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves building to 2 to 4 feet.

$$

LSZ264-221000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
953 PM EDT Thu Sep 21 2017

.REST OF TONIGHT...Southeast winds 5 to 15 knots veering south
late. Patchy fog. A chance of showers. A chance of thunderstorms
after midnight. Waves calm to 2 feet building to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast late.
Patchy fog. A chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering south late. A
chance of showers and thunderstorms. Waves building to 1 to
3 feet.
.SATURDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. A slight chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. A chance of
showers. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves building to 2 to 4 feet.

$$

LSZ265-221000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
953 PM EDT Thu Sep 21 2017

.REST OF TONIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots late. Patchy fog. A chance of showers. A chance of
thunderstorms after midnight. Waves calm to 2 feet building to
1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast late.
Patchy fog through early afternoon. A slight chance of
thunderstorms through early afternoon. A slight chance of
showers. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots veering south. A chance of
showers. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves building to 1 to 3 feet.

$$

LSZ266-221000-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
953 PM EDT Thu Sep 21 2017

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots late. Patchy fog. A chance of showers. A slight
chance of thunderstorms after midnight. Waves calm to 2 feet
building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Patchy fog. A chance of
thunderstorms through early afternoon. A chance of showers. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 1 to
3 feet.
.SATURDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A slight chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves building to 2 to 4 feet.

$$

LSZ267-221000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
953 PM EDT Thu Sep 21 2017

.REST OF TONIGHT...East winds 5 to 15 knots veering southeast
after midnight, then increasing to 10 to 20 knots late. Patchy
fog. A slight chance of showers and thunderstorms after midnight.
Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Patchy fog through early
afternoon. A chance of thunderstorms through early afternoon. A
chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots. A slight chance of
showers through early afternoon. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers, then showers likely. Waves building to 2 to 4 feet.

$$
LSZ261-221000-
MAFOR 2203/
Superior West 11220 11319 11310 12400 11300 11200 11210. Chance
of thunderstorms late overnight and through mid morning Friday.
Patchy fog through mid morning. Chance of showers and
thunderstorms again Friday evening. Waves 2 to 5 feet overnight.
Waves calm to 3 feet Friday. Waves 1 foot or less Friday evening.

Superior North Central 11313 12310 12410 11400 11300 11210.
Patchy fog overnight and into the morning. Chance of showers and
thunderstorms overnight and Friday morning. Chance of showers and
thunderstorms Friday evening. Patchy fog late. Waves 1 to 3 feet
overnight and Friday. Waves 2 feet or less Friday evening.

Superior South Central 13310 12410 12310 11410. Patchy fog late
this evening until late in the morning. Chance of showers late
Friday morning. Waves 1 to 3 feet.

Superior East 12300 15410. Patchy fog late this evening. Patchy
fog in the morning. Patchy fog late. Chance of showers and
thunderstorms Friday morning. Waves 2 feet or less.

$$

WFO MQT

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes


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