Great Lakes Forecast
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698
FZUS63 KMQT 180157
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
957 PM EDT Tue Apr 17 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 29.4 inch low over Maine will cross the Canadian
Maritmes overnight. A ridge of 30.0 inches will follow over Lake
Superior Wednesday morning after which another low of 29.5 inches
moves from the mid Mississippi Valley and through the Ohio Valley
by late Wednesday. A 30.3 inch high will then move over the
western Great Lakes on late Thursday, building to 30.5 inches over
Lake Superior on Friday and remaining in place through the
upcoming weekend.

LSZ162-181000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
957 PM EDT Tue Apr 17 2018 /857 PM CDT Tue Apr 17 2018/

.REST OF TONIGHT...Northeast winds 5 to 15 knots increasing to
15 to 25 knots. Waves calm to 2 feet building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Isolated snow showers and patchy freezing drizzle through
early afternoon. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds less than 10 knots veering southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-181000-
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-
957 PM EDT Tue Apr 17 2018

.REST OF TONIGHT...North winds 10 to 20 knots veering northeast
after midnight, then increasing to 15 to 25 knots late. Waves
2 to 4 feet building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots late. Patchy freezing drizzle through early afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY NIGHT...South winds less than 10 knots veering southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves building to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-181000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
957 PM EDT Tue Apr 17 2018

.REST OF TONIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots late. Waves 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots. A few gale force
gusts to 35 knots late. Waves building to 4 to 7 feet occasionally
to 9 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots. A few gale force
gusts to 35 knots early. Waves 4 to 7 feet occasionally to 9
feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-181000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
957 PM EDT Tue Apr 17 2018

.REST OF TONIGHT...North winds 15 to 25 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots late. Patchy freezing drizzle through early afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots. A few gale force
gusts to 35 knots early. Waves building to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-181000-
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-
957 PM EDT Tue Apr 17 2018

.REST OF TONIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves 5 to 8 feet occasionally to
10 feet subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then becoming north 20 to 30 knots
late. Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots. A few gale force
gusts to 35 knots after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Waves subsiding to 5 to 8 feet occasionally to
10 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...South winds 5 to 15 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-181000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
957 PM EDT Tue Apr 17 2018

.REST OF TONIGHT...North winds 15 to 25 knots. Waves 4 to 7 feet
occasionally to 9 feet subsiding to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then increasing to 20 to 30 knots
late. Waves 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots. A few gale force
gusts to 35 knots late. Waves building to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. Waves building to 4 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 5 to 15 knots. Waves subsiding to 2 to
4 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-181000-
MAFOR 1803/
Superior West 12120 11130 14140 11130. Waves 1 to 4 feet overnight.
Waves 3 to 6 feet building to 4 to 7 feet Wednesday. Waves 3 to 6
feet Wednesday evening.

Superior North Central 12830 12140 11130 11140 12840. Waves 3 to
7 feet.

Superior South Central 11830 12820 12120 11130 12840. Patchy
light freezing drizzle through early afternoon Wednesday. Waves 4
to 7 feet.

Superior East 11830 11820 11830 12130 12830 11840. Waves 3 to 7
feet.

$$

Petro

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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