Great Lakes Forecast
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550
FZUS63 KMQT 210757
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 AM 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...High pressure of 30.0 inches will cross the Upper
Mississippi Valley and linger across the Upper Great Lakes today.
Lake Superior will then remain situated between a 30.1 inch ridge
across the Lower Great Lakes and a 29.8 inch trough over the
Upper Mississippi Valley Friday through Sunday. On Monday the
trough axis shifts eastward over the Upper Great Lakes.

LSZ162-211600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 AM EDT Thu Sep 21 2017 /257 AM CDT Thu Sep 21 2017/

.EARLY THIS MORNING...Southwest winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Patchy fog through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast in the
afternoon, then backing east late. A chance of showers and
thunderstorms through early afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers and thunderstorms.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming northeast 10 to
20 knots. A chance of showers and thunderstorms. Waves building
to 1 to 3 feet.
.MONDAY...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves 1 to 3 feet.

$$

LSZ263-211600-
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-
357 AM EDT Thu Sep 21 2017

.EARLY THIS MORNING...North winds less than 10 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Patchy fog. Waves building to 2 to 4 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight, then becoming south 5 to 15 knots late. Showers and
thunderstorms likely after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. A chance of showers and
thunderstorms through early afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.SATURDAY NIGHT...South winds less than 10 knots increasing to
5 to 15 knots after midnight. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing northeast. A
chance of showers and thunderstorms. Waves building to 1 to
3 feet.
.MONDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.

$$

LSZ264-211600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 AM EDT Thu Sep 21 2017

.EARLY THIS MORNING...North winds 5 to 15 knots. Widespread fog.
Waves 1 to 3 feet.
.TODAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Widespread fog through early afternoon, then patchy
fog by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers through midnight, then
showers likely and a slight chance of thunderstorms after
midnight. Waves 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots. A chance of showers and
thunderstorms through early afternoon. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northeast. A chance of
showers and thunderstorms. Waves building to 1 to 3 feet.
.MONDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet.

$$

LSZ265-211600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 AM EDT Thu Sep 21 2017

.EARLY THIS MORNING...North winds 5 to 15 knots. Areas of fog.
Waves calm to 2 feet.
.TODAY...North winds 5 to 15 knots veering east in the afternoon.
Areas of fog. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms after midnight. Waves
building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south in the
afternoon. A chance of showers and thunderstorms through early
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers and thunderstorms after midnight. 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 increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots veering southeast. A chance
of showers and thunderstorms. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.

$$

LSZ266-211600-
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-
357 AM EDT Thu Sep 21 2017

.EARLY THIS MORNING...North winds 5 to 15 knots. Widespread fog.
Waves 1 to 3 feet.
.TODAY...North winds 5 to 15 knots veering east late. Widespread
fog through early afternoon, then patchy fog by mid afternoon.
Waves subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south late. A
chance of showers and a slight chance of thunderstorms after
midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms through early afternoon. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 1 to 3 feet.
.MONDAY...East winds 10 to 20 knots veering southeast. A chance
of showers and thunderstorms. Waves 1 to 3 feet.

$$

LSZ267-211600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 AM EDT Thu Sep 21 2017

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Widespread
fog. A slight chance of showers. Waves calm to 2 feet.
.TODAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then becoming northeast less than 10 knots
late. Widespread fog through early afternoon, then patchy fog by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering south late. Patchy fog
through midnight. A chance of showers and a slight chance of
thunderstorms after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south in the
afternoon. A chance of showers and thunderstorms through early
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers and thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest. Waves
calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.

$$

LSZ261-211600-
MAFOR 2109/

Superior West 11700 11200 11210 11220 12230 11220 11216. Patchy
fog through early afternoon today. Chance of showers and
thunderstorms tonight. Waves 1 to 5 feet.

Superior North Central 11803 11103 11203 12210 13320. Patchy fog
through late today. Showers and thunderstorms likely after
midnight. Waves 1 to 3 feet.

Superior South Central 12813 11113 11200 11210 12320 11310.
Patchy fog through late today. Chance of showers and thunderstorms
overnight. Waves 1 to 2 feet.

Superior East 11713 12813 12100 11210 11310 11410. Patchy fog
late today. Chance of showers and thunderstorms overnight. Waves
1 to 3 feet.

$$

Ritzman

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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