Great Lakes Forecast
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607
FZUS63 KMQT 261358
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
958 AM EDT Tue Sep 26 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...Low pressure of 29.9 inches will lift northeast
across Lake Superior today before reaching central Quebec at 29.6
inches by Wednesday morning. 30.2 inch high pressure building
across the Central Plains on Wednesday will extend a 30.1 inch
ridge across the Upper Great Lakes Wednesday night before a 29.9
inch trough tracks southeastward across Lake Superior on Thursday.


LSZ162-262200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
958 AM EDT Tue Sep 26 2017 /858 AM CDT Tue Sep 26 2017/

.REST OF TODAY...Northeast winds 15 to 25 knots becoming north
10 to 20 knots late. Areas of fog. Scattered showers. Waves 3 to
6 feet occasionally to 8 feet building to 4 to 7 feet occasionally
to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 15 to 25 knots
after midnight, then veering northwest late. Isolated showers
through midnight. Waves subsiding to 2 to 4 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers by mid afternoon. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ263-262200-
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-
958 AM EDT Tue Sep 26 2017

.REST OF TODAY...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Areas of fog. Scattered showers. Waves 3 to
6 feet occasionally to 8 feet building to 4 to 7 feet occasionally
to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight, then veering northwest late. Scattered
showers through midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then diminishing to 5 to 15 knots late. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY...West winds 5 to 15 knots. A chance of showers by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Scattered showers.
Waves building to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ264-262200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
958 AM EDT Tue Sep 26 2017

.REST OF TODAY...Northeast winds 10 to 20 knots. Areas of fog.
Scattered showers. Waves 3 to 6 feet occasionally to 8 feet
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming west 15 to
25 knots after midnight, then veering northwest late. Scattered
showers. Waves subsiding to 2 to 4 feet, then building to 4 to
7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing west late. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Scattered showers. Waves building to
3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots becoming west 5 to 15 knots.
Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-262200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
958 AM EDT Tue Sep 26 2017

.REST OF TODAY...East winds 5 to 15 knots backing north in the
afternoon. Areas of fog. Isolated thunderstorms by late morning.
Scattered showers. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 20 to 30 knots
after midnight, then veering northwest late. Scattered showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Scattered showers. Waves building
to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 15 to 25 knots becoming west 5 to 15 knots.
Scattered showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-262200-
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-
958 AM EDT Tue Sep 26 2017

.REST OF TODAY...East winds 10 to 20 knots veering south in the
afternoon, then diminishing to 5 to 15 knots late. Areas of fog.
Scattered showers and isolated thunderstorms. Waves 2 to 5 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 20 to 30 knots
after midnight, then veering northwest late. Isolated
thunderstorms through midnight. Scattered showers. Waves
subsiding to 1 to 3 feet, then building to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Scattered showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet.

$$

LSZ267-262200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
958 AM EDT Tue Sep 26 2017

.REST OF TODAY...Southeast winds 5 to 15 knots veering south in
the afternoon. Areas of fog. Scattered showers and isolated
thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 20 to
30 knots. Isolated thunderstorms through midnight. Scattered
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. Isolated showers
through early afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Scattered showers. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Scattered showers through midnight, then numerous
showers after midnight. Waves building to 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.

$$
LSZ261-262200-
MAFOR 2615/
Superior West 11136 11123 11820 11610 11630 12730 11720.
Patchy fog and scattered showers through early evening. Waves 4
to 7 feet this afternoon. Waves 3 to 6 feet tonight and Wednesday
morning.

Superior North Central 11136 11133 11823 11710 14730. Scattered
showers and patchy fog through early evening. Waves 4 to 7 feet
this afternoon. Waves 3 to 6 feet tonight and Wednesday morning.

Superior South Central 11303 11603 11713 11620 12630 12740.
Scattered showers this afternoon and evening. Patchy fog through
early evening. Waves 2 to 3 feet this afternoon, building to 4 to
7 feet late tonight. Waves 4 to 7 feet Wednesday morning.

Superior East 12403 11503 11520 12630 12740. Scattered showers
through the early overnight. Waves 1 to 3 feet, subsiding to 1
foot or less this afternoon. Waves building to 5 to 7 feet
tonight. Waves 6 to 9 feet Wednesday morning.

$$

KCW

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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