Great Lakes Forecast
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FZUS63 KMQT 180910
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
410 AM EST Mon Dec 18 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 high of 30.4 inches centered over the Saint
Lawrence Valley and New England will lead to weak ridging of 30.1
inches over eastern Lake Superior through this morning. Late
today into Tuesday, a 29.5 inch trough will move through the
Upper Great Lakes. A high of 30.2 inches over the central Plains
will follow on Wednesday before a strengthening low pressure of
29.5 inches tracks out of the Rockies and into the Plains on
Thursday. The 29.5 low is expected to track northeast across the
Lower Peninsula through Friday and then cross Lake Huron on
Friday night.

LSZ162-181715-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
410 AM EST Mon Dec 18 2017 /310 AM CST Mon Dec 18 2017/

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Southwest winds 20 to 30 knots. A chance of rain and
snow showers in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...Southwest winds 20 to 30 knots veering west by
midnight. A chance of rain showers, possibly mixed with snow.
Waves subsiding to 3 to 6 feet occasionally to 8 feet, then
building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots increasing to gales to
35 knots. A slight chance of snow showers in the afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 15 to
25 knots after midnight. A slight chance of snow showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering northeast in
the afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Snow showers likely.
Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...East winds 10 to 20 knots backing north. Snow showers
likely, then a chance of snow showers. Waves 3 to 5 feet
occasionally to 7 feet.

$$

LSZ263-181715-
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-
410 AM EST Mon Dec 18 2017

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Southwest winds 20 to 30 knots. A few gale force gusts to
35 knots in the afternoon. Patchy fog in the morning. A chance of
rain showers, possibly mixed with snow in the afternoon. Waves
building to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Southwest winds 20 to 30 knots becoming west by
midnight. A few gale force gusts to 35 knots in the evening. Rain
showers likely in the evening. A chance of snow showers. A slight
chance of rain showers after midnight. Waves subsiding to 6 to 9
feet occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...West winds 20 to 30 knots increasing to gales to
40 knots. A chance of rain showers in the morning. A chance of
snow showers. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 15 to
25 knots after midnight. Freezing spray in the evening. A chance
of snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. A chance of snow
showers in the evening, then snow showers likely after midnight.
Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...East winds 15 to 25 knots backing north. Snow showers
likely, then a chance of snow showers. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ264-181715-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
410 AM EST Mon Dec 18 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE TUESDAY
NIGHT...

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Southwest winds 20 to 30 knots. A few gale force gusts
to 35 knots in the afternoon. Widespread fog. A chance of rain
showers in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...Southwest winds 20 to 30 knots becoming west 20 to 30
knots by midnight, then increasing to gales to 35 knots late. A
few gale force gusts to 35 knots in the evening. Rain showers
likely in the evening. A chance of snow showers. A chance of rain
showers after midnight. Waves subsiding to 6 to 9 feet
occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...West gales to 35 knots becoming northwest gales to
40 knots by mid afternoon. A chance of rain showers in the
morning. A chance of snow showers. Waves building to 10 to
14 feet occasionally to 18 feet.
.TUESDAY NIGHT...Northwest gales to 40 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Snow showers likely in
the evening. A chance of snow showers after midnight. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming north 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. A chance of snow showers in the evening, then
snow showers likely after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...East winds 15 to 25 knots becoming northeast 20 to
30 knots. Snow showers likely. Freezing spray. Waves building to
4 to 7 feet occasionally to 9 feet.

$$

LSZ265-181715-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
410 AM EST Mon Dec 18 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE TUESDAY
NIGHT...

.EARLY THIS MORNING...West winds 10 to 20 knots. Patchy fog.
Waves 1 to 3 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. Areas of fog. A slight chance of rain showers in the
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 20 to 30 knots becoming west gales to
35 knots by midnight. A chance of rain showers. A chance of snow
showers after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...West gales to 45 knots. A chance of rain showers in
the morning. A chance of snow showers. Waves building to 8 to
11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northwest gales to 45 knots diminishing to 20 to
30 knots after midnight. Snow showers likely. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering southeast
after midnight. A chance of snow showers in the evening, then
snow showers after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. Snow showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...East winds 20 to 30 knots backing north. Snow showers.
Waves building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ266-181715-
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-
410 AM EST Mon Dec 18 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE TUESDAY
NIGHT...

.EARLY THIS MORNING...West winds 10 to 20 knots. Patchy fog.
Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Areas of fog. A slight chance of rain
showers in the afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...Southwest winds 20 to 30 knots becoming west gales to
35 knots by midnight. Rain showers likely in the evening. A
chance of snow showers. A chance of rain showers after midnight.
Waves building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 45 knots. A chance of snow showers,
possibly mixed with rain in the morning, then snow showers likely
in the afternoon. Waves building to 12 to 17 feet occasionally to
21 feet.
.TUESDAY NIGHT...Northwest gales to 45 knots. Freezing spray.
Snow showers likely. Waves subsiding to 7 to 10 feet occasionally
to 13 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Freezing spray in the morning. A
chance of snow showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots becoming east 10 to
20 knots after midnight. A chance of snow showers in the evening,
then snow showers after midnight. Waves subsiding to calm to
2 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. Snow showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...East winds 20 to 30 knots backing northeast. Snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ267-181715-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
410 AM EST Mon Dec 18 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE TUESDAY
NIGHT...

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Patchy fog.
Waves 1 to 3 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. Areas of fog. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Southwest winds 20 to 30 knots increasing to gales to
35 knots by midnight, then veering west late. Rain showers,
possibly mixed with snow. Waves building to 8 to 11 feet
occasionally to 14 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
45 knots. A chance of rain and snow showers in the morning, then
snow showers, possibly mixed with rain in the afternoon. Waves
building to 12 to 17 feet occasionally to 21 feet.
.TUESDAY NIGHT...Northwest gales to 45 knots. Snow showers. Waves
subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots veering east after
midnight. A chance of snow showers in the evening, then snow
showers likely after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. Snow showers likely. Waves building to 2 to 4 feet.
.FRIDAY...East winds 20 to 30 knots backing northeast. Snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.

$$

LSZ261-181715-
MAFOR 1810/
Superior West 11530 13540 11546 11646 12640. Chance of rain
showers late today into tonight. Waves 3 to 6 feet building to 5
to 8 feet today. Waves 5 to 8 feet tonight.

Superior North Central...Gale Warning in effect...11530 11543
12553 11540 11556 11656 11650. Patchy fog through mid morning.
Chance of rain showers late today. Chance of rain showers late
tonight. Waves 3 to 6 feet building to 6 to 10 feet today. Waves
6 to 10 feet tonight.

Superior South Central...Gale Warning in effect...11620 11513
11523 12530 11540 11656 11650. Patchy fog this morning. Chance of
rain showers this evening. Chance of rain showers late tonight.
Waves 1 to 3 feet building to 3 to 5 feet today. Waves 3 to 6
feet building to 5 to 9 feet tonight.

Superior East...Gale Warning in effect...11610 12523 11530 11540
11546 11547 11647. Patchy fog this morning. Patchy fog late
today. Chance of rain showers through early evening tonight.
Waves 2 to 4 feet building to 3 to 5 feet today. Waves 5 to 8
feet building to 6 to 9 feet tonight.

$$

Voss

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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