Great Lakes Forecast
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FZUS63 KMQT 161924
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
324 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 low pressure system of 29.8 inches will move across
southern Ontario this evening. A strengthening high pressure
system of 30.4 inches will then settle over the area and persist
through Friday. A low pressure trough averaging 29.9 inches will
track across the region this weekend, followed by a high pressure
system of 30.2 inches.

LSZ162-170330-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
324 PM EDT Wed May 16 2018 /224 PM CDT Wed May 16 2018/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet building to 1 to
3 feet.
.TONIGHT...East winds 15 to 25 knots backing northeast after
midnight. A slight chance of rain showers through midnight. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 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.

$$

LSZ263-170330-
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-
324 PM EDT Wed May 16 2018

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. A chance
of thunderstorms and a slight chance of rain showers. Waves 1 to
3 feet.
.TONIGHT...Northeast winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 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.

$$

LSZ264-170330-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
324 PM EDT Wed May 16 2018

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...North winds 15 to 25 knots veering northeast after
midnight, then diminishing to 10 to 20 knots late. Waves building
to 2 to 4 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.

$$

LSZ265-170330-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
324 PM EDT Wed May 16 2018

.LATE THIS AFTERNOON...North winds 10 to 20 knots. A slight
chance of rain showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering northeast late.
Waves building to 2 to 4 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.

$$

LSZ266-170330-
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-
324 PM EDT Wed May 16 2018

.LATE THIS AFTERNOON...North winds 10 to 20 knots. A slight
chance of rain showers. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots becoming northeast 15 to
25 knots late. Waves 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.

$$

LSZ267-170330-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
324 PM EDT Wed May 16 2018

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. A slight
chance of rain showers. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots veering north after
midnight, then veering northeast late. Waves 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.

$$

LSZ261-170330-
MAFOR 1621/
Superior West 12230 15130. Chance of rain showers and
thunderstorms early this evening. Waves 2 to 4 feet this evening
building to 3 to 5 feet Thursday.

Superior North Central 12830 11820 13120 12110. Waves 1 to 4 feet.

Superior South Central 11820 11620 11710 13120 11110 11100. Waves
1 to 4 feet.

Superior East 12720 11820 13120 11110 11800. 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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