Great Lakes Forecast
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154
FZUS63 KMQT 260746
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
346 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 this morning 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.

LSZ162-261600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
346 AM EDT Tue Sep 26 2017 /246 AM CDT Tue Sep 26 2017/

.EARLY THIS MORNING...Northeast winds 20 to 30 knots. Patchy fog.
Showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then becoming north 10 to 20 knots
late. Patchy fog through early afternoon. Showers through early
afternoon, then scattered showers by mid afternoon. Waves
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.

$$

LSZ263-261600-
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-
346 AM EDT Tue Sep 26 2017

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Patchy fog.
Numerous showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog through early afternoon. Numerous
showers through early afternoon, then scattered showers by mid
afternoon. Waves 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.

$$

LSZ264-261600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
346 AM EDT Tue Sep 26 2017

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Patchy fog.
Scattered showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog through early afternoon. Numerous
showers through early afternoon, then scattered showers by mid
afternoon. Waves building to 5 to 8 feet occasionally to 10 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.

$$

LSZ265-261600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
346 AM EDT Tue Sep 26 2017

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy fog.
Scattered showers. Waves 2 to 4 feet.
.TODAY...East winds 5 to 15 knots backing north in the afternoon.
Patchy fog through early afternoon. Isolated thunderstorms
through early afternoon. Scattered showers. Waves 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.

$$

LSZ266-261600-
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-
346 AM EDT Tue Sep 26 2017

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Patchy fog.
Scattered showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...East winds 10 to 20 knots veering south in the
afternoon, then diminishing to 5 to 15 knots late. Patchy fog
through early afternoon. Scattered showers and isolated
thunderstorms. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 2 to 4 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.

$$

LSZ267-261600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
346 AM EDT Tue Sep 26 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Areas of
fog. Isolated showers and thunderstorms. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.TODAY...Southeast winds 5 to 15 knots veering south in the
afternoon. Patchy fog through early afternoon. 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.

$$

LSZ261-261600-
MAFOR 2609/
Superior West 13136 11120 11820 11610 11630 11730. Patchy fog
this morning. Scattered showers through early evening tonight.
Waves 4 to 7 feet today. Waves 3 to 6 feet tonight.

Superior North Central 11130 12136 11130 11820 11710 12730.
Patchy fog this morning. Scattered showers through early evening
tonight. Waves 3 to 6 feet building to 5 to 8 feet today. Waves 3
to 6 feet tonight.

Superior South Central 11110 11200 11300 11600 11710 11620 12630.
Patchy fog this morning. Scattered showers through early evening
tonight. Waves 2 to 3 feet today. Waves 2 to 3 feet building to 3
to 6 feet tonight.

Superior East 11210 11310 11410 11400 11500 11520 12630. Patchy
fog this morning. Scattered showers. Waves 1 to 3 feet building
to 2 to 4 feet...Then subsiding to 1 to 3 feet today. Waves 1 foot
or less building to 3 to 6 feet tonight.

$$

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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