Great Lakes Forecast
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FZUS63 KMQT 150714
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
314 AM 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 weak trough of 29.8 inches over Lake Superior this
morning will be followed by a 30.2 inch high pressure system
today. Another 29.9 inch trough of low pressure will move across
Lake Superior on Wednesday and be replaced again by a high
pressure ridge og 30.2 inches Wednesday night through Friday
morning. A 29.9 inch trough will then move into the Upper Great
Lakes Friday night into Saturday.

LSZ162-151515-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
314 AM EDT Tue May 15 2018 /214 AM CDT Tue May 15 2018/

.TODAY...Northeast winds 5 to 15 knots veering east late. Waves
calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots increasing to 10 to
20 knots. Waves 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 subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. A slight chance of rain showers. Waves building
to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots veering south. A chance of
rain showers. Waves building to 2 to 4 feet, then subsiding to
calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. A chance of rain showers.
Waves building to 1 to 3 feet.

$$

LSZ263-151515-
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-
314 AM EDT Tue May 15 2018

.TODAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then increasing to 15 to 25 knots late. Isolated rain
showers after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 5 to
15 knots in the afternoon, then becoming east 10 to 20 knots
late. A slight chance of rain showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots. A slight chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots veering south. A chance of
rain showers. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots. A chance of rain showers.
Waves 1 to 3 feet.

$$

LSZ264-151515-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
314 AM EDT Tue May 15 2018

.TODAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon, then veering southeast late. Waves
2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots late. Isolated rain showers after midnight. Waves
building to 2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 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...North winds 10 to 20 knots veering east after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.THURSDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Waves building to
1 to 3 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south. Waves
building to 2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.

$$

LSZ265-151515-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
314 AM EDT Tue May 15 2018

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TODAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering east late. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then becoming southwest 15 to 25 knots late. Waves
building to 1 to 3 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then becoming north 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Waves 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots backing north. A chance of
rain showers. Waves building to 2 to 4 feet.

$$

LSZ266-151515-
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-
314 AM EDT Tue May 15 2018

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 1 to
3 feet building to 3 to 5 feet occasionally to 7 feet.
.TODAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon, then diminishing to less than 10 knots
late. Waves subsiding to 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots after midnight, then becoming southwest 15 to 25 knots
late. Isolated rain showers after midnight. Waves subsiding to
calm to 2 feet, then building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming northwest
10 to 20 knots in the afternoon, then becoming north 5 to
15 knots late. A slight chance of rain 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 after midnight. 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 building to
1 to 3 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots backing north. A chance of
rain showers. Waves building to 2 to 4 feet.

$$

LSZ267-151515-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
314 AM EDT Tue May 15 2018

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TODAY...Northeast winds 10 to 20 knots backing north in the
afternoon, then becoming northwest 5 to 15 knots late. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then increasing to 15 to 25 knots late. Isolated rain showers
after midnight. Waves subsiding to calm to 2 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon, then veering northwest late. A slight
chance of rain showers through early afternoon. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves 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. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots backing north. A chance of
rain showers. Waves building to 1 to 3 feet.

$$

LSZ261-151515-
MAFOR 1509/
Superior West 13110 11210 11200 11400 11500 11510. Waves 1 to 3
feet today. Waves 2 feet or less tonight.

Superior North Central 12120 11110 11200 11310 11410 11420 11520.
Waves 2 to 4 feet subsiding to 1 to 3 feet today. Waves 1 to 3
feet building to 2 to 4 feet tonight.

Superior South Central 11820 11120 11110 11100 11210 11310 12420.
Waves 2 to 3 feet building to 3 to 5 feet, then subsiding to 2 to
3 feet today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

Superior East 12120 11810 11710 11700 11500 11310 11420. Waves 1
to 2 feet building to 2 to 4 feet today. Waves 1 to 3 feet
tonight.

$$

07

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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