Great Lakes Forecast
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FZUS63 KMQT 131927
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
327 PM EDT Sun May 13 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 29.9 inch ridge will remain over the
Upper Great Lakes through early next week, briefly strengthening to
30.1 inches Tuesday. A weak trough averaging 29.9 inches will then
slowly move into the western Great Lakes Tuesday evening through
Wednesday. A high pressure system of 30.2 inches will shift into
south central Canada through Thursday, slowly pushing off to the
east on Friday.

LSZ162-140330-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
327 PM EDT Sun May 13 2018 /227 PM CDT Sun May 13 2018/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering west late. Waves subsiding
to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of rain showers through
midnight. Waves building to 2 to 4 feet.
.THURSDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet.

$$

LSZ263-140330-
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-
327 PM EDT Sun May 13 2018

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight, then becoming north 10 to 20 knots late. Waves calm to
2 feet.
.TUESDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...East winds 5 to 15 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast. A chance of
rain showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-140330-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
327 PM EDT Sun May 13 2018

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west after
midnight, then diminishing to 10 to 20 knots late. Waves 2 to
4 feet.
.MONDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering north after
midnight, then increasing to 15 to 25 knots late. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots veering north by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots veering east
after midnight. Waves building to 2 to 4 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.

$$

LSZ265-140330-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
327 PM EDT Sun May 13 2018

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight, then veering west late. Waves calm to
2 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering northwest after
midnight, then becoming north 10 to 20 knots late. Waves calm to
2 feet.
.TUESDAY...North winds 10 to 20 knots becoming east 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots becoming
southwest 15 to 25 knots after midnight. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots veering north by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots becoming east
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.

$$

LSZ266-140330-
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-
327 PM EDT Sun May 13 2018

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 10 to 20 knots veering west late. Waves
building to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight, then veering north late. Waves
calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots veering north by mid
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 2 to 4 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast. Waves
subsiding to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots veering southeast. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.

$$

LSZ267-140330-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
327 PM EDT Sun May 13 2018

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. Waves building to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then diminishing to 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering north after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering northwest by
mid afternoon. Waves 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...Northeast winds 10 to 20 knots becoming southeast
5 to 15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ261-140330-
MAFOR 1321/
Superior West 13520 11510 13610 11510. Waves 1 to 4 feet.

Superior North Central 12530 11520 12620 13610. Waves 2 to 4
feet.

Superior South Central 11310 11400 11510 11520 11620 11610 11710
11800. Waves 1 to 3 feet.

Superior East 11410 11420 13520 11610 12600. Waves 1 to 3 feet.

$$

Borchardt

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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