Great Lakes Forecast
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FZUS63 KMQT 221459
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
959 AM EST Wed Nov 22 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 30.4 inch high over the Central Plains will move to
the Ohio River Valley late today, then gradually push south
through Thursday. Early Thursday morning, a 29.9 inch trough in
Western Ontario will quickly swing south across the Upper Great
Lakes only to be replaced by a 30.0 inch ridge late Thursday
night. Friday morning, a 29.0 inch low will track east across
central and eastern Manitoba reaching central Ontario by Friday
evening. A 30.2 inch ridge will then move into the northern plains
on Saturday, reaching the Ohio River Valley by Sunday evening.

LSZ162-222300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
959 AM EST Wed Nov 22 2017 /859 AM CST Wed Nov 22 2017/

.REST OF TODAY...West winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing southwest by mid
afternoon. Scattered snow showers in the afternoon. Waves 1 to
3 feet building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight. Numerous snow showers in the evening. Waves subsiding
to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.FRIDAY NIGHT...West gales to 35 knots. Waves building to 5 to
8 feet occasionally to 10 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet, then building to 2 to 4 feet.

$$

LSZ263-222300-
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-
959 AM EST Wed Nov 22 2017

.REST OF TODAY...West winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing southwest by mid
afternoon. Isolated snow showers. Waves 2 to 4 feet building to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by midnight, then diminishing to 15 to 25 knots late.
Scattered snow showers. Waves building to 4 to 8 feet
occasionally to 10 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest by late
morning, then becoming west 5 to 15 knots by mid afternoon. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A slight chance of snow showers in
the evening. A slight chance of rain showers after midnight.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Rain showers likely in the afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight. A chance of rain showers. A chance of snow showers
after midnight. Waves building to 7 to 10 feet occasionally to
13 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ264-222300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
959 AM EST Wed Nov 22 2017

.REST OF TODAY...West winds 10 to 20 knots increasing to 15 to
25 knots. Isolated snow showers. Waves 2 to 4 feet building to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by midnight, then diminishing to 15 to 25 knots late.
Scattered snow showers. Waves building to 4 to 8 feet
occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A slight chance of snow showers in the morning. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. A chance of snow showers. A slight
chance of rain showers after midnight. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 15 to 25 knots increasing to gales to
35 knots in the afternoon. Rain showers likely in the afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight. A chance of rain showers. A chance of snow showers
after midnight. Waves building to 9 to 12 feet occasionally to
15 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.

$$

LSZ265-222300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
959 AM EST Wed Nov 22 2017

.REST OF TODAY...West winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing southwest by mid
afternoon. Scattered snow showers. Waves 2 to 4 feet subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight. Isolated snow showers after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 20 to 30 knots veering northwest by late
morning, then diminishing to 10 to 20 knots by mid afternoon. A
slight chance of snow showers in the morning. Waves subsiding to
1 to 3 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of snow showers in the
evening. A slight chance of rain showers after midnight. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots. Rain showers likely in
the afternoon. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.FRIDAY NIGHT...West gales to 40 knots. A chance of rain showers.
Waves building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of snow showers. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ266-222300-
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-
959 AM EST Wed Nov 22 2017

.REST OF TODAY...West winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing southwest by mid
afternoon. Scattered snow showers. Waves 3 to 6 feet occasionally
to 8 feet subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Southwest winds 20 to 30 knots veering west by
midnight, then diminishing to 15 to 25 knots late. Isolated snow
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots veering northwest by late
morning, then diminishing to 15 to 25 knots by mid afternoon. A
chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming south
20 to 30 knots after midnight. A slight chance of snow showers. A
slight chance of rain showers after midnight. Waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...South winds 20 to 30 knots veering southwest in the
afternoon. Rain showers likely in the afternoon. Waves building
to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West gales to 35 knots. A chance of rain showers.
Waves building to 10 to 14 feet occasionally to 18 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of snow showers. Waves building to 12 to
17 feet occasionally to 21 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 1 to 3 feet.

$$

LSZ267-222300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
959 AM EST Wed Nov 22 2017

.REST OF TODAY...Northwest winds 5 to 15 knots becoming west
10 to 20 knots by late morning, then becoming southwest 15 to
25 knots by mid afternoon. Scattered snow showers. Waves 3 to
6 feet occasionally to 8 feet subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by midnight, then veering west late. Scattered snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots veering northwest. A chance
of snow showers, possibly mixed with rain. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots after midnight. A chance of snow showers. A chance of
rain showers after midnight. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.FRIDAY...South gales to 35 knots veering southwest in the
afternoon. A chance of rain showers in the morning, then rain
showers likely in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. Rain showers in the evening, then a
chance of rain showers, possibly mixed with snow after midnight.
Waves building to 10 to 14 feet occasionally to 18 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. Rain showers likely. A chance of snow showers. Waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 1 to 3 feet.

$$
LSZ261-222300-
MAFOR 2216/
Superior West 11630 12530 12540 12630 11620. Scattered snow
showers this evening. Waves 2 to 6 feet this afternoon and
tonight, subsiding to 1 to 3 feet Thursday morning.

Superior North Central 11630 11640 12540 13640 11730. Scattered
snow showers tonight. Waves 2 to 6 feet this afternoon. Waves 5
to 8 feet tonight and Thursday morning.

Superior South Central 11620 12520 12530 13630. Scattered snow
showers late this morning. Waves 1 to 5 feet.

Superior East 11620 11630 13530 13630. Scattered snow showers
this afternoon through late tonight. Chance of snow showers
Thursday morning. Waves 2 to 6 feet this afternoon and tonight.
Waves 5 to 7 feet Thursday 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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