Great Lakes Forecast
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000
FZUS63 KMQT 121448
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
948 AM 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 29.7 inches the Lower Great
Lakes this morning will shift to the New England states late
today. At the same time, a high pressure system averaging 30.2
inches will slide from southern Manitoba into Ontario. A secondary
low of 29.7 inches will then move into the lower Great Lakes on
Wednesday. Several weak low pressure systems will then form over
the western Great Lakes Thursday and Friday before a stronger low
of 29.5 inches approaches the area on Saturday.

LSZ162-122300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
948 AM EST Tue Dec 12 2017 /848 AM CST Tue Dec 12 2017/

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots by mid afternoon. Isolated snow showers through noon.
Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south by midnight,
then becoming southeast 10 to 20 knots late. Scattered snow
showers. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. Numerous snow showers in the morning,
then scattered snow showers in the afternoon. Waves building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Isolated snow
showers. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Scattered snow
showers. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Scattered snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. Scattered snow showers.
Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots. Scattered snow showers.
Waves building to 1 to 3 feet.

$$

LSZ263-122300-
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-
948 AM EST Tue Dec 12 2017

.REST OF TODAY...North winds 15 to 25 knots diminishing to 5 to
15 knots. Isolated snow showers. Waves 3 to 6 feet occasionally
to 8 feet subsiding to 1 to 3 feet.
.TONIGHT...North winds 5 to 15 knots veering east by midnight,
then veering southeast late. Isolated snow showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Scattered snow showers in the morning, then numerous
snow showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Scattered snow showers. Waves subsiding
to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots. Scattered snow
showers. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. Scattered snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. Scattered snow showers.
Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots. Scattered snow showers. Waves building to 1 to 3 feet.

$$

LSZ264-122300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
948 AM EST Tue Dec 12 2017

...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

.REST OF TODAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Freezing spray through early afternoon. Scattered snow
showers. Waves 3 to 6 feet occasionally to 8 feet subsiding to 2
to 4 feet.
.TONIGHT...North winds 5 to 15 knots veering east late. Scattered
snow showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Scattered snow showers. Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Scattered snow
showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Scattered snow showers. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Scattered snow showers. Waves building to 1 to
3 feet.
.FRIDAY...North winds 15 to 25 knots. Scattered snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Scattered snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ265-122300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
948 AM EST Tue Dec 12 2017

...GALE WARNING IN EFFECT UNTIL 11 AM EST THIS MORNING...

.REST OF TODAY...North winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Gale force gusts to 35 knots through
noon. Freezing spray. Snow showers. Waves 7 to 10 feet
occasionally to 13 feet subsiding to 3 to 6 feet occasionally to 8
feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots by midnight. Scattered snow showers. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. Scattered snow showers. Waves building
to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Scattered snow showers. Waves 2 to
4 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. Scattered snow showers. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Scattered snow showers in the
evening, then numerous snow showers after midnight. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots. Numerous snow showers, then
scattered snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest.
Scattered snow showers. Waves subsiding to calm to 2 feet.

$$

LSZ266-122300-
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-
948 AM EST Tue Dec 12 2017

...GALE WARNING IN EFFECT UNTIL 11 AM EST THIS MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

.REST OF TODAY...North gales to 35 knots diminishing to 20 to
30 knots by noon. Heavy freezing spray through noon, then freezing
spray. Snow showers. Waves 9 to 12 feet occasionally to 15 feet
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots becoming northeast 10 to
20 knots by midnight. Numerous snow showers in the evening, then
scattered snow showers after midnight. Waves subsiding to calm to
2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northeast by late
morning, then increasing to 15 to 25 knots by mid afternoon.
Scattered snow showers. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots. Scattered snow
showers. Waves building to 2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Scattered snow showers. Waves subsiding to 1 to
3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. Scattered snow
showers in the evening, then numerous snow showers after
midnight. Waves 1 to 3 feet.
.FRIDAY...North winds 20 to 30 knots. Snow showers, then
scattered snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming southwest
15 to 25 knots. Scattered snow showers. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.

$$

LSZ267-122300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
948 AM EST Tue Dec 12 2017

...GALE WARNING IN EFFECT UNTIL 11 AM EST THIS MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

.REST OF TODAY...North gales to 35 knots diminishing to 20 to
30 knots by noon. Heavy freezing spray through early afternoon,
then freezing spray. Scattered snow showers. Waves 7 to 10 feet
occasionally to 13 feet subsiding to 3 to 5 feet occasionally to 7
feet.
.TONIGHT...North winds 15 to 25 knots becoming northeast 10 to
20 knots by midnight. Scattered snow showers. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northeast by late
morning, then increasing to 15 to 25 knots by mid afternoon.
Scattered snow showers. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots. Scattered snow
showers. Waves 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Scattered snow showers. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Numerous snow showers. Waves building to 1 to
3 feet.
.FRIDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. Snow showers, then scattered snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots veering south. Scattered
snow showers. Waves subsiding to calm to 2 feet.

$$
LSZ261-122300-
MAFOR 1216/
Superior West 11720 12710 11800 11300 11310 11320 11227.
Scattered snow showers overnight. Waves 1 to 4 feet.

Superior North Central...Heavy Freezing Spray Warning in effect...
11830 12820 11810 11110 11200 11210 11220. Freezing spray late
this morning. Scattered snow showers this afternoon and tonight.
Waves 3 to 6 feet this afternoon subsiding to 1 to 3 feet tonight
and Wednesday morning.

Superior South Central...Heavy Freezing Spray Warning in effect...
11847 12837 11827 11817 11800 12210. Heavy freezing spray through
early afternoon, then freezing spray through late afternoon.
Scattered snow showers overnight and Wednesday morning. Waves 5 to
8 feet this afternoon subsiding to 1 to 3 feet tonight and
Wednesday morning.

Superior East...Heavy Freezing Spray Warning in effect...12840
12830 11120 13110. Heavy freezing spray through early afternoon,
then freezing spray through late afternoon. Scattered snow
showers this afternoon and tonight. Waves 5 to 8 feet subsiding
to 3 to 6 feet this afternoon. Waves subsiding to 3 feet or less
tonight through Wednesday morning.

$$

Kluber

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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