Great Lakes Forecast
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931
FZUS63 KMQT 130249
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 PM EST Tue Dec 12 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 pressure system of 29.5 inches over eastern
North Dakota will move to southern Lake Michigan on Wednesday.
A weak low pressure system of 30.0 inches will then form near Lake
Superior Thursday and will strengthen on Friday as it moves over
Lake Huron to 29.6 inches by the evening. Weak ridging of 30.2
inches Saturday will give way to another trough on Sunday.

LSZ162-131100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 PM EST Tue Dec 12 2017 /849 PM CST Tue Dec 12 2017/

.REST OF TONIGHT...South winds 5 to 15 knots becoming southeast
10 to 20 knots late. A chance of snow showers late in the
evening, then snow showers likely after midnight. Waves calm to
2 feet building to 1 to 3 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. Snow showers. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots by midnight, then diminishing to 5 to 15 knots
late. A chance of snow showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots. A slight chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. A chance of snow showers. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots. A chance of snow showers.
Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-131100-
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-
949 PM EST Tue Dec 12 2017

.REST OF TONIGHT...South winds 5 to 15 knots backing southeast by
midnight, then increasing to 10 to 20 knots late. A chance of
snow showers. Waves calm to 2 feet building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots backing east by late
morning, then becoming northeast 15 to 25 knots by mid afternoon.
Snow showers likely in the morning, then a chance of snow showers
in the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest in the
afternoon. A chance of snow showers. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. A chance of snow showers. Waves building to 1 to
3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to calm to 2 feet, then building to 3 to
6 feet occasionally to 8 feet.

$$

LSZ264-131100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 PM EST Tue Dec 12 2017

.REST OF TONIGHT...Northeast winds less than 10 knots becoming
southeast 5 to 15 knots by midnight. A chance of snow showers.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.THURSDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. A chance of snow showers. Waves 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves building to 2 to 4 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of snow showers. Waves building to 1 to
3 feet.
.SUNDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.

$$

LSZ265-131100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 PM EST Tue Dec 12 2017

.REST OF TONIGHT...Northwest winds 5 to 15 knots becoming
southwest less than 10 knots by midnight, then becoming southeast
5 to 15 knots late. A chance of snow showers. Waves 2 to 4 feet
subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots by late morning, then backing northeast by mid
afternoon. A chance of snow showers. Waves building to 2 to
4 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Waves 1 to
3 feet.
.FRIDAY...Northwest winds 15 to 25 knots veering north in the
afternoon. Snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots veering south. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.

$$

LSZ266-131100-
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-
949 PM EST Tue Dec 12 2017

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering east by
midnight. A chance of snow showers. Waves 2 to 4 feet subsiding
to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing northeast by mid
afternoon. A chance of snow showers. Waves building to 2 to
4 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots. Snow showers. Freezing
spray in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Freezing spray in the
evening. Snow showers likely in the evening, then a chance of
snow showers after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...East winds 10 to 20 knots veering southwest. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SUNDAY...South winds 15 to 25 knots veering southwest. A chance
of snow showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ267-131100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 PM EST Tue Dec 12 2017

.REST OF TONIGHT...Northeast winds 10 to 20 knots veering east
late. A chance of snow showers. Waves 2 to 4 feet subsiding to
calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A slight chance of snow showers. Waves
building to 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots backing north
by midnight. A chance of snow showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. A chance of snow showers. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers likely. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Snow showers. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Snow showers likely
in the evening, then a chance of snow showers after midnight.
Waves subsiding to 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering south. A
chance of snow showers. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots veering southwest. A chance
of snow showers. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.

$$

LSZ261-131100-
MAFOR 1304/
Superior West 11417 12327 12237 11137 12130. Chance of snow
showers late this evening and again on Wednesday evening. Waves 1
to 5 feet through Wednesday. Waves 3 to 6 feet Wednesday evening.

Superior North Central 11200 11310 11320 11220 11230 12130 11830.
Chance of snow showers late overnight through early afternoon
Wednesday. Waves 1 to 5 feet.

Superior South Central 11100 11300 11310 11320 11220 11120 11130
11830. Chance of snow showers. Waves 1 to 5 feet.

Superior East 11110 11200 11210 12220 11120 12130. Chance of snow
showers overnight. Waves 1 to 4 feet.

$$

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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