Great Lakes Forecast
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595
FZUS63 KMQT 160907
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
407 AM EST Thu Nov 16 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 low of 29.5 inches will continue to track east of
Lake Huron today while a 30.3 inch ridge tracks across the Upper
Great Lakes. This ridge will continue eastward ahead of another
29.6 inch trough that will cross the Upper Great Lakes Friday
night. This trough will move eastward through the weekend and
strengthen to around 29.0 inches across the Eastern Great Lakes,
while a 30.2 inch ridge drops south across the Northern and
Central Plains. A 29.2 inch trough will move through Alberta and
Saskatchewan towards the Upper Great Lakes on Monday.

LSZ162-161715-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
407 AM EST Thu Nov 16 2017 /307 AM CST Thu Nov 16 2017/

.EARLY THIS MORNING...North winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots becoming east 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.TONIGHT...Southeast winds 15 to 25 knots becoming south 20 to
30 knots late. A chance of rain and snow. Waves building to 4 to
7 feet occasionally to 9 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots by late morning, then diminishing to 10 to 20 knots by
mid afternoon. A chance of snow in the morning. Rain likely.
Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. A slight chance of rain. A slight chance
of snow after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest in the
afternoon. A chance of snow showers in the afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers. Waves
3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 20 to
30 knots. Waves subsiding to calm to 2 feet, then building to
4 to 7 feet occasionally to 9 feet.

$$

LSZ263-161715-
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-
407 AM EST Thu Nov 16 2017

...GALE WARNING IN EFFECT UNTIL 5 AM EST EARLY THIS MORNING...

.EARLY THIS MORNING...North winds 20 to 30 knots. A few gale
force gusts to 35 knots. Isolated snow showers. Waves 8 to 11
feet occasionally to 14 feet subsiding to 7 to 10 feet
occasionally to 13 feet.
.TODAY...North winds 20 to 30 knots becoming northeast 10 to
20 knots by late morning, then veering east by mid afternoon.
Waves subsiding to 2 to 4 feet.
.TONIGHT...Southeast winds 15 to 25 knots becoming south 20 to
30 knots late. A chance of rain and snow. Waves building to 4 to
7 feet occasionally to 9 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 10 to
20 knots by mid afternoon. Snow likely in the morning. Rain.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 2 to 4 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. A chance of rain. A slight chance of
snow after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.SATURDAY...North winds 20 to 30 knots. Waves building to 4 to
7 feet occasionally to 9 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots. Snow showers
likely in the evening, then a chance of snow showers after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.MONDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. Waves building to 5 to 8 feet occasionally to 10 feet.

$$

LSZ264-161715-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
407 AM EST Thu Nov 16 2017

...GALE WARNING IN EFFECT UNTIL 8 AM EST THIS MORNING...
...GALE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

.EARLY THIS MORNING...North gales to 35 knots. Isolated snow
showers. Waves 10 to 14 feet occasionally to 18 feet.
.TODAY...North winds 20 to 30 knots becoming northeast 15 to
25 knots by late morning, then becoming east 5 to 15 knots by mid
afternoon. Waves subsiding to 2 to 4 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then becoming south gales to 35 knots late.
A chance of snow, possibly mixed with rain after midnight. Waves
subsiding to 1 to 3 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY...South gales to 35 knots becoming southwest 15 to
25 knots by mid afternoon. Snow in the morning...then rain. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. A chance of rain. A slight chance
of snow after midnight. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.SATURDAY...North winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet.
.SATURDAY NIGHT...North gales to 35 knots backing northwest after
midnight. Snow showers likely. Freezing spray after midnight.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming west 10 to
20 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.MONDAY...South winds 10 to 20 knots becoming west 20 to
30 knots. A chance of rain showers, possibly mixed with snow.
Waves subsiding to calm to 2 feet, then building to 6 to 9 feet
occasionally to 11 feet.

$$

LSZ265-161715-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
407 AM EST Thu Nov 16 2017

...GALE WARNING IN EFFECT UNTIL 8 AM EST THIS MORNING...
...GALE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

.EARLY THIS MORNING...North gales to 35 knots. Scattered snow
showers. Waves 12 to 17 feet occasionally to 21 feet subsiding to
11 to 15 feet occasionally to 19 feet.
.TODAY...North gales to 35 knots becoming northeast 15 to
25 knots by late morning, then diminishing to 10 to 20 knots by
mid afternoon. Isolated snow showers in the morning. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 15 to
25 knots by midnight, then becoming south gales to 35 knots late.
A chance of snow, possibly mixed with rain after midnight. Waves
subsiding to 1 to 3 feet, then building to 5 to 8 feet
occasionally to 10 feet.
.FRIDAY...South gales to 40 knots diminishing to 20 to 30 knots
by mid afternoon. Snow likely in the morning...then rain. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots veering north
after midnight. Rain likely in the evening, then a chance of
rain, possibly mixed with snow after midnight. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...North winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. A chance of snow showers, possibly
mixed with rain. Waves building to 9 to 12 feet occasionally to
15 feet.
.SATURDAY NIGHT...Northwest gales to 35 knots. Snow showers
likely. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots. Snow showers likely, then a chance of snow showers.
Waves subsiding to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. Waves building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ266-161715-
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-
407 AM EST Thu Nov 16 2017

...GALE WARNING IN EFFECT UNTIL 10 AM EST THIS MORNING...
...GALE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

.EARLY THIS MORNING...North gales to 45 knots. Scattered snow
showers. Waves 12 to 17 feet occasionally to 21 feet.
.TODAY...North gales to 40 knots diminishing to 20 to 30 knots by
late morning, then becoming northeast 10 to 20 knots by mid
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 15 to
25 knots by midnight, then becoming south gales to 35 knots late.
A chance of snow, possibly mixed with rain after midnight. Waves
subsiding to 1 to 3 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY...South gales to 40 knots. A chance of snow in the
morning...then rain. Waves building to 9 to 12 feet occasionally
to 15 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Rain in the evening, then a chance
of rain after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...North winds 20 to 30 knots increasing to gales to
40 knots in the afternoon. A chance of rain showers, possibly
mixed with snow. Waves building to 10 to 14 feet occasionally to
18 feet.
.SATURDAY NIGHT...North gales to 40 knots becoming northwest
gales to 35 knots after midnight. A chance of rain showers in the
evening. Snow showers likely. Waves subsiding to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY...Northwest gales to 35 knots becoming west 15 to
25 knots. Snow showers likely. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves subsiding to 2 to 4 feet, then building to 6 to
9 feet occasionally to 11 feet.

$$

LSZ267-161715-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
407 AM EST Thu Nov 16 2017

...GALE WARNING IN EFFECT UNTIL 10 AM EST THIS MORNING...
...GALE WATCH IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY
AFTERNOON...

.EARLY THIS MORNING...North gales to 45 knots. Scattered snow
showers. Waves 10 to 14 feet occasionally to 18 feet subsiding to
10 to 14 feet occasionally to 18 feet.
.TODAY...North gales to 40 knots diminishing to 15 to 25 knots.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming southeast
15 to 25 knots by midnight, then increasing to 20 to 30 knots
late. A slight chance of snow after midnight. Waves subsiding to
1 to 3 feet, then building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Southeast gales to 35 knots becoming south gales to
40 knots. A chance of snow in the morning...then a mix of rain
and snow in the afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots becoming north 10 to
20 knots after midnight. Rain. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Rain showers likely. A chance of snow
showers in the afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet.
.SATURDAY NIGHT...North gales to 40 knots. Freezing rain,
possibly mixed with rain showers in the evening, then snow
showers likely after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 9 to 12 feet
occasionally to 15 feet.
.SUNDAY...Northwest gales to 35 knots becoming west 15 to
25 knots. Snow showers likely. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...South winds 15 to 25 knots becoming southwest gales to
35 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet, then building to 6 to 9 feet occasionally to 11 feet.

$$

LSZ261-161715-
MAFOR 1610/

Superior West 11840 11130 11120 11220 11320 12340 11440. Chance
of rain and snow overnight. Waves 3 to 7 feet.

Superior North Central...Gale Warning in effect...11850 11840
11130 11120 11210 11320 11330 11450. Chance of snow, rain and
light freezing rain after midnight. Waves 9 to 13 feet subsiding
to 3 to 7 feet.

Superior South Central...Gale Warning in effect...12850 11840
11120 11110 11210 11330 11440. Scattered snow showers early this
morning...then a chance of snow late tonight. Waves 11 to 16 feet
subsiding to 4 to 7 feet.

Superior East...Gale Warning in effect...12850 11840 11830 11120
11220 12330. Scattered snow showers early this morning...then a chance
of snow late tonight. Waves 10 to 13 feet subsiding to 3 to 6
feet.

$$

Ritzman

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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