Great Lakes Forecast
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FZUS63 KMQT 252009
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
409 PM EDT Tue Jul 25 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 30.1 inches over the eastern Great
Lakes region will drift to New England through Wednesday morning. A
trough of 29.8 inches will then move across Lake Superior late
tonight through Wednesday afternoon. A 30.0 inch ridge will build
southeastward across the Upper Great Lakes on Thursday, then persist
through the weekend.

LSZ162-260415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
409 PM EDT Tue Jul 25 2017 /309 PM CDT Tue Jul 25 2017/

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Isolated
showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then becoming west 10 to 20 knots late. Scattered
showers and isolated thunderstorms. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds less than 10 knots becoming
west 5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Scattered
showers. Waves calm to 2 feet.

$$

LSZ263-260415-
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-
409 PM EDT Tue Jul 25 2017

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight. Scattered showers and isolated
thunderstorms. Waves building to 2 to 4 feet.
.WEDNESDAY...West winds 5 to 15 knots. A slight chance of showers
through early afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight, then diminishing to less than 10 knots late. Waves
subsiding to calm to 2 feet.
.THURSDAY...North winds less than 10 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY...West winds less than 10 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds less than 10 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Scattered
showers. Waves calm to 2 feet.

$$

LSZ264-260415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
409 PM EDT Tue Jul 25 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Scattered showers and isolated thunderstorms. Waves building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots becoming north
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds less than 10 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ265-260415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
409 PM EDT Tue Jul 25 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then becoming southwest 10 to 20 knots
late. Scattered showers and isolated thunderstorms. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of showers and a
slight chance of thunderstorms through early afternoon. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots veering north late.
Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ266-260415-
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-
409 PM EDT Tue Jul 25 2017

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
Scattered showers and thunderstorms. Waves building to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west in the
afternoon, then diminishing to 5 to 15 knots late. A chance of
showers and a slight chance of thunderstorms through early
afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north late.
Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ267-260415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
409 PM EDT Tue Jul 25 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Isolated showers through midnight, then numerous
showers and scattered thunderstorms after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots late. Showers likely and a chance of thunderstorms
through early afternoon, then a slight chance of showers by mid
afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north late.
Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ261-260415-
MAFOR 2521/
Superior West 11310 12410 11510 12610 12510. Scattered showers
late this evening. Waves 1 to 4 feet.

Superior North Central 11320 13420 11520 12620 11610. Scattered
showers after midnight tonight. Waves 1 to 5 feet.

Superior South Central 11320 13420 12520 12610. Scattered showers
and thunderstorms late tonight. Chance of showers Wednesday
morning. Waves 1 to 4 feet.

Superior East 11320 11420 11430 11436 11430 11536 11520 11610.
Scattered showers and thunderstorms late tonight through mid
Wednesday morning. Waves 1 to 3 feet building to 3 to 6 feet
tonight and Wednesday.

$$

JSS

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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