Great Lakes Forecast
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FZUS63 KMQT 091955
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 PM EDT Wed Aug 9 2017

For waters beyond five 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 29.9 inch low pressure over South Dakota will
move eastward, reaching northern Lake Michigan Thursday night and
eastern Ontario Saturday morning while deepening to 29.8 inches. A
30.1 inch high pressure over the northern Plains will move over the
western Great Lakes Sunday, then remain nearly stationary through
Monday.

LSZ162-100400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 PM EDT Wed Aug 9 2017 /255 PM CDT Wed Aug 9 2017/

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. A chance
of showers and a slight chance of thunderstorms. Waves 1 to 3
feet.
.TONIGHT...East winds 5 to 15 knots increasing to 15 to 25 knots.
Areas of fog. Showers and a slight chance of thunderstorms. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...East winds 10 to 20 knots backing northeast in the
afternoon, then increasing to 15 to 25 knots late. Areas of fog.
Showers likely. Isolated thunderstorms by mid afternoon. Waves
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots backing north
late. A slight chance of showers through midnight. Waves
subsiding to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots becoming south 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds less than 10 knots becoming northwest
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering west. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-100400-
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-
355 PM EDT Wed Aug 9 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Patchy fog. A chance of showers through midnight. Showers
likely after midnight. A slight chance of thunderstorms. Waves
building to 1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots backing northeast in the
afternoon. Patchy fog. Showers likely and isolated thunderstorms.
Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing north late. Patchy
fog. A slight chance of showers. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Patchy fog through early afternoon. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northwest winds less than 10 knots becoming west 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-100400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 PM EDT Wed Aug 9 2017

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Patchy fog. A chance of
showers and a slight chance of thunderstorms through midnight.
Showers likely after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then diminishing to 5 to 15 knots late. Areas
of fog. Showers likely and isolated thunderstorms. Waves building
to 1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Areas of fog. A
slight chance of thunderstorms through midnight. A chance of
showers. Waves building to 2 to 4 feet.
.FRIDAY...North winds 5 to 15 knots. Patchy fog through early
afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-100400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 PM EDT Wed Aug 9 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 5 to
15 knots after midnight, then veering southwest late. A chance of
showers through midnight. Showers likely after midnight. A slight
chance of thunderstorms. Patchy fog after midnight. Waves calm to
2 feet.
.THURSDAY...East winds 10 to 20 knots veering southeast in the
afternoon, then backing east late. Patchy fog. Showers likely and
scattered thunderstorms. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. Patchy fog. A slight chance of thunderstorms
through midnight. A chance of showers. Waves 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Patchy fog through early afternoon. A
slight chance of showers through early afternoon. Waves 1 to
3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots veering north. Patchy fog.
Waves calm to 2 feet.

$$

LSZ266-100400-
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-
355 PM EDT Wed Aug 9 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Patchy fog. A slight chance of showers through
midnight. Showers likely after midnight. Isolated thunderstorms.
Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming southeast 15 to
25 knots in the afternoon, then becoming east 10 to 20 knots
late. Patchy fog. Showers likely and scattered thunderstorms.
Waves building to 1 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots becoming northeast
10 to 20 knots late. Areas of fog. Showers likely and a slight
chance of thunderstorms through midnight. A chance of showers
after midnight. Waves 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. Patchy fog through early
afternoon. A slight chance of showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. Waves 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest. Patchy fog.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-100400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 PM EDT Wed Aug 9 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Patchy fog after midnight. Waves calm to
2 feet.
.THURSDAY...Southeast winds 10 to 20 knots backing east late.
Patchy fog. Showers likely and scattered thunderstorms. Waves
calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Patchy fog. Showers
likely through midnight. A chance of thunderstorms. A chance of
showers after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. Patchy fog through early afternoon. A
chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots. Patchy fog. Waves calm
to 2 feet.

$$

LSZ261-100400-
MAFOR 0921/
Superior West 11210 12216 11226 11236 11226 11126 11136. Chance
of showers through early evening. Patchy fog Thursday afternoon.
Waves 2 feet or less building to 2 to 4 feet tonight. Waves 2 to
5 feet Thursday.

Superior North Central 12310 11200 11216 11306 11216 12226.
Patchy fog overnight through mid morning Thursday. Chance of
showers overnight. Waves 1 to 3 feet.

Superior South Central 11300 11310 11300 11400 11416 11226 12326.
Patchy fog overnight and Thursday. Chance of showers overnight.
Scattered thunderstorms Thursday afternoon. Waves 2 feet or less.

Superior East 13300 12400 12316 11326. Patchy fog overnight and
Thursday. Chance of showers overnight. Waves 1 to 2 feet.

$$

Kluber

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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