Great Lakes Forecast
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FZUS63 KMQT 261948
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
348 PM EDT Sat May 26 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 trough averaging 29.7 inches will
linger across the Great Lakes through the Memorial Day weekend. The
trough will shift to the lower Great Lakes and weaken to 29.9 inches
on Monday. A high pressure ridge of 30.1 inches will then follow
across northern Ontario and the upper Great Lakes on late Monday
afternoon. On Tuesday, the 30.1 inch high will shift over Quebec. On
early Wednesday morning a 29.4 inch low just to the south of Lake
Winnipeg tracks east into northwestern Ontario by early Wednesday
morning. The low further weakens to 29.5 inches on Thursday morning
near western Lake Superior. The low weakens further to 29.6 inches
as it tracks southeast across the upper Great Lakes through Thursday
evening.

LSZ162-270400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
348 PM EDT Sat May 26 2018 /248 PM CDT Sat May 26 2018/

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming west less than
10 knots after midnight, then backing southwest late. Patchy fog.
Waves calm to 2 feet.
.SUNDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then becoming south less than 10 knots
late. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots becoming northeast
5 to 15 knots after midnight. A chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. A
chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northeast. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-270400-
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-
348 PM EDT Sat May 26 2018

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming north less than
10 knots after midnight, then backing west late. A slight chance
of showers and thunderstorms through midnight. Areas of fog.
Waves calm to 2 feet.
.SUNDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then becoming south less than 10 knots
late. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds less than 10 knots increasing to
5 to 15 knots after midnight, then veering southwest late. A
slight chance of showers through midnight, then showers likely
and a slight chance of thunderstorms after midnight. Waves calm
to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...South winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northeast. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-270400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
348 PM EDT Sat May 26 2018

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then backing west late. A slight chance of showers and
thunderstorms through midnight. Areas of fog. Waves calm to
2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest late. Patchy
fog. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then becoming southwest 10 to 20 knots late. A chance
of showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming south 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-270400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
348 PM EDT Sat May 26 2018

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

$$

LSZ266-270400-
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-
348 PM EDT Sat May 26 2018

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Areas of
fog. Isolated showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south late.
Areas of fog through midnight. Widespread fog after midnight. A
chance of rain showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest in the
afternoon, then backing west late. Patchy fog. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A slight chance of
rain showers after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering north by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet.

$$

LSZ267-270400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
348 PM EDT Sat May 26 2018

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Areas of fog.
Scattered showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering south late. Widespread fog.
A chance of thunderstorms and a slight chance of rain showers.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering west in the
afternoon. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. A slight chance of rain showers after midnight. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing north by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 15 to 25 knots. Waves building
to 1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots becoming north 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ261-270400-
MAFOR 2621/
Superior West 12100 11800 11603 13500 11400. Patchy fog this
evening and Sunday. Waves 1 foot or less.

Superior North Central 12200 11203 11103 11603 11600 12610.
Patchy fog this evening. Chance of rain showers and thunderstorms
through early evening. Patchy fog Sunday. Waves 1 to 2 feet.

Superior South Central 12310 11303 11403 11503 11600 11700 11100.
Patchy fog this evening. Patchy fog from late morning on Sunday.
Waves 1 foot or less.

Superior East 11213 11303 12313 11403 11400 11500 11600.
Scattered showers and thunderstorms this evening. Chance of
showers and thunderstorms overnight. Patchy fog from late morning
on Sunday. Waves 1 to 2 feet.

$$

RJT

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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