Great Lakes Forecast
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FZUS63 KMQT 260151
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
951 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 continues to 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.

LSZ162-261000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
951 PM EDT Mon Sep 25 2017 /851 PM CDT Mon Sep 25 2017/

.REST OF TONIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Patchy fog. Showers and isolated
thunderstorms after midnight. Waves calm to 2 feet building to 3
to 6 feet.
.TUESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Patchy fog through early afternoon.
Numerous to scattered showers. Waves subsiding to 3 to 5 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.

$$

LSZ263-261000-
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-
951 PM EDT Mon Sep 25 2017

.REST OF TONIGHT...Northeast winds 15 to 25 knots. Patchy fog.
Numerous showers and isolated thunderstorms. Waves 1 to 3 feet
building to 3 to 6 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.
.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.

$$

LSZ264-261000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
951 PM EDT Mon Sep 25 2017

.REST OF TONIGHT...North winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Patchy fog. Numerous showers and
isolated thunderstorms. Waves 1 to 3 feet building to 3 to 6 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.

$$

LSZ265-261000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
951 PM EDT Mon Sep 25 2017

.REST OF TONIGHT...North winds 10 to 20 knots veering northeast
after midnight, then diminishing to 5 to 15 knots late. Patchy
fog. Scattered showers and isolated thunderstorms. Waves 1 to
3 feet 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.

$$

LSZ266-261000-
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-
951 PM EDT Mon Sep 25 2017

.REST OF TONIGHT...North winds 10 to 20 knots veering east late.
Patchy fog. Scattered showers and isolated thunderstorms. Waves
1 to 3 feet building to 3 to 5 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 3 to 6
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.

$$

LSZ267-261000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
951 PM EDT Mon Sep 25 2017

.REST OF TONIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight, then veering south late. Areas of
fog. Waves calm to 2 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.

$$
LSZ261-261000-
MAFOR 2603/
Superior West 14136 11136 11130 11820 11710. Patchy fog
through early morning. Chance of showers through early Tuesday
evening. Waves 1 to 3 feet building to 3 to 5 feet overnight.
Waves 3 to 6 feet Tuesday and Tuesday evening.

Superior North Central 14136 11136 11130 11120 11810. Patchy fog
through early morning. Chance of showers late Tuesday. Waves 3 to
6 feet.

Superior South Central 11810 11110 11100 11600 11300 11510 11610
11720. Patchy fog. Scattered showers late this evening...Then
scattered showers and thunderstorms after midnight. Patchy fog in
the morning. Chance of showers Tuesday. Waves 2 to 3 feet.

Superior East 11810 11120 11220 11310 11410 12510 11626. Patchy
fog late overnight. Chance of showers Tuesday afternoon. Waves 1
to 4 feet.

$$

BORCHARDT

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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