Great Lakes Forecast
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FZUS63 KMQT 150209
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1009 PM EDT Mon May 14 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 will move over Lake
Superior overnight followed by a 30.2 inch high on Tuesday. The
aforementioned high pressure system will remain over the Great
Lakes for much of the week. A 29.9 inch trough will then move into
the Upper Great Lakes this weekend.

LSZ162-151015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1009 PM EDT Mon May 14 2018 /909 PM CDT Mon May 14 2018/

.REST OF TONIGHT...Northwest winds 5 to 15 knots veering
northeast late. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds less than 10 knots becoming southwest
5 to 15 knots after midnight. A slight chance of rain showers
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. A slight chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knows backing northeast
by midnight. A chance of rain showers. Waves building to 1 to 3
feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of rain showers. 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...Northeast winds 5 to 15 knots. A chance of rain
showers. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.
.SATURDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 1 to 3 feet.

$$

LSZ263-151015-
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-
1009 PM EDT Mon May 14 2018

.REST OF TONIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight, then veering northeast late. Waves calm
to 2 feet building to 2 to 4 feet.
.TUESDAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southwest after
midnight, then increasing to 10 to 20 knots late. A chance of
rain showers after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. A slight chance of rain showers through early
afternoon. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. Waves 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...Northeast winds 5 to 15 knots veering east. A chance of
rain showers. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots backing north. A
chance of rain showers. Waves 1 to 3 feet.

$$

LSZ264-151015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1009 PM EDT Mon May 14 2018

.REST OF TONIGHT...West winds 10 to 20 knots veering north after
midnight, then increasing to 15 to 25 knots late. Waves calm to
2 feet building to 2 to 4 feet.
.TUESDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon, then veering southeast late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots late. A chance of rain showers after midnight.
Waves building to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. A slight chance of rain showers
through early afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. 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 10 to 20 knots. A chance of rain
showers after midnight. Waves building to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of rain showers. Waves building to 2 to 4 feet.
.SATURDAY...Northeast winds 10 to 20 knots backing north. A
chance of rain showers. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.

$$

LSZ265-151015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1009 PM EDT Mon May 14 2018

.REST OF TONIGHT...South winds 5 to 15 knots veering northwest
after midnight, then becoming north 15 to 25 knots late. Waves
calm to 2 feet building to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots becoming northeast 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 1 to 3
feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight, then becoming southwest 10 to 20 knots late. A
slight chance of rain showers after midnight. Waves 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. A chance of rain showers through early
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. 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. Waves building to
1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots veering southeast. A chance
of rain showers. Waves 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots backing north. A
chance of rain showers. Waves building to 2 to 4 feet.

$$

LSZ266-151015-
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-
1009 PM EDT Mon May 14 2018

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

$$

LSZ267-151015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1009 PM EDT Mon May 14 2018

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering north
after midnight, then increasing to 10 to 20 knots late. Waves
calm to 2 feet building to 1 to 3 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing northwest late. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight, then increasing to 10 to 20 knots late. A slight chance
of 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 10 to 20 knots becoming northwest
5 to 15 knots by mid afternoon. A 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...Northwest winds 5 to 15 knots veering north
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...East winds 10 to 20 knots veering southeast. Waves
subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing north. A chance of
rain showers. Waves building to 1 to 3 feet.

$$
LSZ261-151015-
MAFOR 1503/
Superior West 11720 11820 11120 11110 11210 12200 11300. Waves 1
to 3 feet.

Superior North Central 11620 11830 11820 11120 11110 11200 11310
11410. Waves 1 to 4 feet.

Superior South Central 11510 11720 11830 11820 11810 11800 11200
11310. Waves 1 to 3 feet overnight building to 3 to 5 feet
Tuesday, then subsiding to 1 to 2 feet Tuesday evening.

Superior East 11600 14820 12710 11600. Waves 1 to 4 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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