Great Lakes Forecast
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746
FZUS63 KMQT 160153
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
953 PM EDT Tue May 15 2018

For waters beyond 5 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...A high pressure system of 30.2 inches over Lake
Superior this evening will progress eastward overnight. A low
pressure system of 29.8 inches will pass through southern Ontario
and Lake Superior Wednesday followed by a strengthening high
pressure system of 30.4 inches. The aforementioned high pressure
system will persist through Friday before a low pressure trough
averaging 29.9 inches swings through this weekend.

LSZ162-161000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
953 PM EDT Tue May 15 2018 /853 PM CDT Tue May 15 2018/

.REST OF TONIGHT...Northwest winds less than 10 knots becoming
southwest 5 to 15 knots after midnight, then increasing to 10 to
20 knots late. Waves calm to 2 feet building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing east late. A slight
chance of showers by mid afternoon. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. A slight chance of rain showers through midnight.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots. A slight chance of
rain showers by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. A chance of rain showers. A chance
of thunderstorms after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southwest after
midnight. A chance of rain showers. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots veering northeast. A
chance of rain showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-161000-
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 Tue May 15 2018

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
after midnight, then increasing to 10 to 20 knots late. A slight
chance of rain showers after midnight. Waves calm to 2 feet
building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming northeast 10 to 20 knots
late. A slight chance of rain showers. Waves subsiding to 1 to
3 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots. A slight chance of
rain showers by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. A chance of rain showers. A chance of
thunderstorms after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of rain showers after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots veering northeast. A
chance of rain showers. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ264-161000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
953 PM EDT Tue May 15 2018

.REST OF TONIGHT...South winds 10 to 20 knots veering southwest
late. A slight chance of rain showers after midnight. Waves calm
to 2 feet building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. A slight chance of rain showers through early afternoon.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Waves building to
1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. A chance of rain showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.

$$

LSZ265-161000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
953 PM EDT Tue May 15 2018

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then becoming southwest 15 to 25 knots late. A
slight chance of rain showers after midnight. Waves calm to
2 feet building to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering northeast late. A slight
chance of showers through early afternoon. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots late. Waves building to 1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots. A chance of rain showers.
Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...North winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ266-161000-
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 Tue May 15 2018

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then becoming southwest 15 to
25 knots late. A slight chance of rain showers after midnight.
Waves calm to 2 feet building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering north late. A slight
chance of rain showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots late. Waves building to 1 to 3 feet.
.THURSDAY...Northeast winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...South winds 15 to 25 knots becoming north 10 to
20 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...North winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ267-161000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
953 PM EDT Tue May 15 2018

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then increasing to 15 to 25 knots
late. A slight chance of rain showers after midnight. Waves calm
to 2 feet building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering north late. A slight
chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight, then veering northeast late. Waves
building to 1 to 3 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots becoming east
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 20 to 30 knots becoming south
15 to 25 knots after midnight. Waves 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots backing northeast. A
chance of rain showers. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$
LSZ261-161000-
MAFOR 1603/
Superior West 11600 14520 11410 11120 11220. Waves 1 to 2 feet
overnight. Waves 2 to 4 feet Wednesday. Waves 1 to 3 feet
building to 2 to 4 feet Wednesday evening.

Superior North Central 11420 13520 11620 11800 12810. Chance of
rain showers through mid morning Wednesday. Waves 1 to 3 feet.

Superior South Central 11420 11430 11530 11520 11610 12110 11800.
Waves 1 to 3 feet building to 2 to 4 feet overnight. Waves 2 to 4
feet subsiding to 1 foot or less Wednesday. Waves 1 foot or less
Wednesday evening.

Superior East 11310 11430 12530 11510 11600 11700 11800. Waves 1
foot or less building to 2 to 4 feet overnight. Waves 3 to 5 feet
subsiding to 1 to 3 feet Wednesday. Waves 1 to 2 feet Wednesday
evening.

$$

Voss

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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