Great Lakes Forecast
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FZUS63 KMQT 210752
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
352 AM EDT Mon Aug 21 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...30.1 high pressure over northern Minnesota will move
across the northern Great Lakes today. Low pressure of 29.8 inches
over the central plains will move through northern Lake Huron by
early Tuesday. A 30.2 inch high pressure extending from Manitoba
to Nebraska Tuesday night will move over Wisconsin Thursday
morning and remain over the Great Lakes through Friday.

LSZ162-211600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
352 AM EDT Mon Aug 21 2017 /252 AM CDT Mon Aug 21 2017/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots backing northeast late. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northwest after
midnight, then increasing to 10 to 20 knots late. A slight chance
of showers through midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. A slight chance of showers by mid afternoon. Waves
building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ263-211600-
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-
352 AM EDT Mon Aug 21 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds less than 10 knots backing southwest in the
afternoon, then becoming northeast 5 to 15 knots late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing north after midnight,
then backing northwest late. A slight chance of showers through
midnight. Patchy fog after midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming northwest
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...North winds less than 10 knots becoming southwest
5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-211600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
352 AM EDT Mon Aug 21 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds less than 10 knots backing south late. Waves
calm to 2 feet.
.TONIGHT...Southeast winds less than 10 knots becoming northwest
5 to 15 knots late. A slight chance of showers. Waves calm to
2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming west 15 to
25 knots late. A slight chance of showers by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-211600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
352 AM EDT Mon Aug 21 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing east late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming north 10 to 20 knots
after midnight, then becoming northwest 5 to 15 knots late.
Showers likely and a slight chance of thunderstorms through
midnight, then a chance of showers after midnight. Waves calm to
2 feet.
.TUESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then backing west late. Waves building
to 2 to 4 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots. Waves building
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots. Waves
subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming south 10 to 20 knots.
Waves calm to 2 feet.

$$

LSZ266-211600-
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-
352 AM EDT Mon Aug 21 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing east late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing north late. A slight
chance of thunderstorms through midnight. A chance of showers.
Patchy fog after midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon, then backing west late. Waves building
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ267-211600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
352 AM EDT Mon Aug 21 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing north late. Patchy
fog. Showers likely and a slight chance of thunderstorms. Waves
calm to 2 feet.
.TUESDAY...North winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon, then becoming west gales to 35 knots
late. Patchy fog through early afternoon. A slight chance of
showers through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.

$$

LSZ261-211600-
MAFOR 2109/
Superior West 12600 11500 11600 11100 11200 11300 11710. Waves 1
foot or less.

Superior North Central 13600 11500 11400 12300 11400. Waves 2
feet or less.

Superior South Central 12600 11700 11800 12200 11206 11810.
Chance of showers through early evening. Chance of showers late
tonight. Waves 1 foot or less.

Superior East 13600 11500 11300 11200 11206 11216. Patchy fog
overnight. Chance of showers late this evening. Waves 2 feet or
less.

$$

JLB

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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