Great Lakes Forecast
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966
FZUS63 KMQT 170145
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
945 PM EDT Wed May 16 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 strengthening high pressure system of 30.2 inches
will settle over Ontario Thursday and reach Southern Quebec on
Friday at 30.4 inches. A low pressure trough averaging 29.9
inches will track across Lake Superior Saturday, followed by a
high pressure system of 30.2 inches Sunday that will weaken to
30.1 inches Monday.

LSZ162-170945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
945 PM EDT Wed May 16 2018 /845 PM CDT Wed May 16 2018/

.REST OF TONIGHT...Northeast winds 20 to 30 knots with a few gale
force gusts to 35 knots becoming northeast 15 to 25 knots after
midnight. Waves 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A slight chance of rain showers. 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 slight chance of rain showers
through midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing northeast by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-170945-
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-
945 PM EDT Wed May 16 2018

.REST OF TONIGHT...Northeast winds 20 to 30 knots with a few gale
force gusts to 35 knots diminishing to 15 to 25 knots after
midnight. Waves 2 to 5 feet.
.THURSDAY...Northeast winds 15 to 25 knots. A slight chance of
rain showers by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-170945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
945 PM EDT Wed May 16 2018

.REST OF TONIGHT...North winds 20 to 30 knots becoming northeast
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon, then backing northeast late. 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 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots becoming south
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...South winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming west 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ265-170945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
945 PM EDT Wed May 16 2018

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

$$

LSZ266-170945-
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-
945 PM EDT Wed May 16 2018

.REST OF TONIGHT...Northwest winds 15 to 25 knots veering
northeast after midnight. Waves 1 to 3 feet building to 2 to
4 feet.
.THURSDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
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 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots becoming south
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing north by mid
afternoon. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots. Waves 2 to 4 feet.
.SUNDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$

LSZ267-170945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
945 PM EDT Wed May 16 2018

.REST OF TONIGHT...Northwest winds 15 to 25 knots veering
northeast after midnight. Waves calm to 2 feet building to 2 to
4 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing north in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight, then becoming southeast 10 to 20 knots late.
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 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west. Waves
subsiding to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$
LSZ261-170945-
MAFOR 1703/
Superior West 11140 19150 15130 11130. Waves 3 to 6 feet.

Superior North Central 11830 13120 12110 12100. Waves 1 to 4 feet
overnight and Thursday. Waves 1 foot or less Thursday evening.

Superior South Central 11830 13120 11110 12100 11200. Waves 1 to 4
feet.

Superior East 11840 13120 11110 12800 11100. Waves 1 to 4 feet.

$$

KCW

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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