Great Lakes Forecast
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822
FZUS63 KMQT 212001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 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...High pressure of 30.0 inches will 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.

LSZ162-220415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Thu Sep 21 2017 /301 PM CDT Thu Sep 21 2017/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Patchy fog.
Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet.
.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 subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 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.

$$

LSZ263-220415-
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-
401 PM EDT Thu Sep 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. Patchy
fog. A chance of showers and thunderstorms. Waves 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.

$$

LSZ264-220415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Thu Sep 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south late.
Patchy fog. A chance of showers. A chance of thunderstorms after
midnight. Waves 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.

$$

LSZ265-220415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Thu Sep 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.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 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.

$$

LSZ266-220415-
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-
401 PM EDT Thu Sep 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Patchy fog. A
chance of showers. A slight chance of thunderstorms after
midnight. Waves 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.

$$

LSZ267-220415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Thu Sep 21 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds less than 10 knots becoming southeast 5 to
15 knots 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.

$$

LSZ261-220415-
MAFOR 2121/
Superior West 13220 11319 11310 12400 11300. Patchy fog. Chance
of showers and thunderstorms late this evening through mid
morning Friday. Waves 2 to 4 feet building to 3 to 5 feet...Then
subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet subsiding to 1
foot or less Friday.

Superior North Central 11210 11310 11313 12310 12410 11400.
Patchy fog this evening into Friday morning. Chance of showers
and thunderstorms overnight. Chance of showers and thunderstorms
Friday morning. Waves 1 to 3 feet.

Superior South Central 11210 14310 12410 11310. Patchy fog this
evening. Patchy fog late in the morning. Chance of showers late
Friday morning. Waves 1 to 3 feet.

Superior East 11100 11200 12300 14410. Patchy fog this evening.
Patchy fog in the morning. Chance of showers and thunderstorms
Friday morning. Waves 2 feet or less.

$$

Titus

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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