Great Lakes Forecast
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283
FZUS63 KMQT 251956
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
356 PM EDT Mon Sep 25 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...A 29.9 inch low pressure will develop over the Upper
Mississippi Valley tonight along a 29.9 inch trough currently
stretching from far western Quebec to western Lake Superior. The
low will cross Lake Superior Tuesday 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. 30.3 inch high pressure will then drift
southeastward across the Upper Great Lakes Friday and Saturday.

LSZ162-260400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
356 PM EDT Mon Sep 25 2017 /256 PM CDT Mon Sep 25 2017/

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Numerous
showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...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. Numerous showers
through early afternoon, then scattered showers by mid afternoon.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-260400-
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-
356 PM EDT Mon Sep 25 2017

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Scattered
showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 15 to 25 knots. Numerous showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots late. Patchy fog through early afternoon. Numerous
showers and isolated thunderstorms through early afternoon, then
scattered showers by mid afternoon. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots increasing to
15 to 25 knots. A chance of showers. 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 by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots. A chance of showers. Waves
1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots after midnight. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 15 to 25 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-260400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
356 PM EDT Mon Sep 25 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Isolated
showers. Waves building to 1 to 3 feet.
.TONIGHT...North winds 10 to 20 knots becoming northeast 15 to
25 knots after midnight. Showers and isolated thunderstorms
through midnight. Waves building to 3 to 6 feet occasionally to 8
feet.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Numerous showers and isolated thunderstorms
through early afternoon, then scattered showers by mid afternoon.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots late. A chance of showers. 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 by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots. A chance of showers. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...North winds 15 to 25 knots becoming northeast 5 to
15 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-260400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
356 PM EDT Mon Sep 25 2017

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Scattered
showers and isolated thunderstorms. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast after
midnight, then diminishing to 5 to 15 knots late. Scattered
showers and thunderstorms. Patchy fog after midnight. Waves
building to 2 to 4 feet.
.TUESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots in the afternoon, then backing northwest late. Patchy
fog through early afternoon. Scattered showers and thunderstorms.
Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-260400-
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-
356 PM EDT Mon Sep 25 2017

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet building
to 1 to 3 feet.
.TONIGHT...North winds 10 to 20 knots veering east late. Patchy
fog. Scattered showers and thunderstorms. Waves building to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest in the
afternoon, then backing south late. Patchy fog through early
afternoon. Scattered showers and thunderstorms. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots increasing to
20 to 30 knots after midnight. A chance of showers. Waves
subsiding to 1 to 3 feet, then 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 building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 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 veering northwest by mid
afternoon. A chance of showers. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. A chance of showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then 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.

$$

LSZ267-260400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
356 PM EDT Mon Sep 25 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots veering south late. Patchy
fog. Isolated showers and thunderstorms after midnight. Waves
building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest in the
afternoon. Patchy fog through early afternoon. Scattered showers
and thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then becoming northwest 20 to 30 knots
late. Showers likely and a slight chance of thunderstorms through
midnight, then a chance of showers after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. A slight chance of
showers. Waves building to 4 to 8 feet occasionally to 10 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. A chance of showers. Waves
1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots after midnight. Showers likely. Waves building to
3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 20 to 30 knots becoming northeast 10 to
20 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ261-260345-
MAFOR 2521/
Superior West 11810 11126 14136 11136 11130. Scattered showers
early this evening. Patchy fog late in the morning. Scattered
showers Tuesday afternoon. Waves 1 foot or less building to 3 to
5 feet tonight. Waves 4 to 6 feet Tuesday.

Superior North Central 12820 14136 11136 11130. Scattered showers
through early evening. Scattered showers late Tuesday. Waves 1 to
3 feet building to 3 to 5 feet tonight. Waves 4 to 6 feet
Tuesday.

Superior South Central 13810 11110 11100 11600 11300 11510.
Patchy fog late. Scattered showers and thunderstorms through
late tonight. Patchy fog in the morning. Scattered showers and
thunderstorms Tuesday. Waves 1 to 3 feet.

Superior East 12800 11810 11120 11220 11310 11410 11510. Patchy
fog early this evening and tomorrow morning. Scattered showers
through early afternoon...Then scattered showers and thunderstorms
late Tuesday. Waves building to 1 to 3 feet tonight. Waves 1 to 4
feet Tuesday.

T
$$

BB

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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