Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
000
FZUS63 KMQT 120318
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1018 PM EST Mon Dec 11 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 near Sault Sainte
Marie will track southeast over Lake Huron overnight as a high
pressure system of 30.2 inches moves through Ontario on Tuesday.
A secondary low of 29.7 inches will then move into the lower Great
Lakes on Wednesday. Several weak low pressure will then form over
the western Great Lakes Thursday and Friday before a stronger low
of 29.5 inches approaches the area on Saturday.

LSZ162-121130-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1018 PM EST Mon Dec 11 2017 /918 PM CST Mon Dec 11 2017/

...GALE WARNING IN EFFECT UNTIL 11 PM EST /10 PM CST/ THIS
EVENING...

.REST OF TONIGHT...North gales to 35 knots diminishing to 20 to
30 knots by midnight, then becoming northwest 15 to 25 knots
late. Freezing spray late in the evening. Isolated snow showers
after midnight. Waves 5 to 8 feet occasionally to 10 feet
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then veering north by mid afternoon.
Isolated snow showers. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering northeast by
midnight, then veering south late. A chance of snow showers after
midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots in the afternoon. A chance of snow showers. Waves calm
to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. A chance of snow showers. Waves
calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. A chance of snow showers. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
snow showers. Waves building to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots veering north. A chance
of snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 15 to 25 knots backing north. A chance of
snow showers. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.

$$

LSZ263-121130-
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-
1018 PM EST Mon Dec 11 2017

...GALE WARNING IN EFFECT UNTIL 1 AM EST TUESDAY...

.REST OF TONIGHT...North gales to 40 knots diminishing to 20 to
30 knots late. Freezing spray. Isolated snow showers. Waves 8 to
11 feet occasionally to 14 feet subsiding to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Freezing spray in the morning.
Isolated snow showers. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering northeast
late. A slight chance of snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots. A chance of snow
showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. A chance of snow showers. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. Snow showers likely in the morning,
then a chance of snow showers in the afternoon. Waves building 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. Snow showers likely, then a
chance of snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 15 to 25 knots. A chance of snow showers.
Waves building to 1 to 3 feet.

$$

LSZ264-121130-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1018 PM EST Mon Dec 11 2017

...GALE WARNING IN EFFECT UNTIL 5 AM EST TUESDAY...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY
AFTERNOON...

.REST OF TONIGHT...North gales to 45 knots. Heavy freezing spray.
Scattered snow showers. Waves 10 to 14 feet occasionally to
18 feet subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray in the morning. Scattered snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots by midnight. A chance of snow showers. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. A chance of snow showers.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A chance of snow showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves calm
to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...North 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 calm to 2 feet.
.SATURDAY...East winds 15 to 25 knots. A chance of snow showers.
Waves building to 1 to 3 feet.

$$

LSZ265-121130-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1018 PM EST Mon Dec 11 2017

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

.REST OF TONIGHT...North gales to 45 knots. Freezing spray. Snow
showers. Waves 10 to 14 feet occasionally to 18 feet building to
11 to 15 feet occasionally to 19 feet, then subsiding to 10 to
14 feet occasionally to 18 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots.
Freezing spray. Snow showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY 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.
.WEDNESDAY...North winds 5 to 15 knots veering east in the
afternoon. A chance of snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of snow showers. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon. A chance of snow showers in the
morning, then snow showers likely in the afternoon. Waves
building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers likely in the
evening, then a chance of snow showers after midnight. Waves 1 to
3 feet.
.FRIDAY...Northwest winds 15 to 25 knots veering north. Snow
showers likely. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SATURDAY...East winds 15 to 25 knots. A chance of snow showers,
then snow showers likely. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.

$$

LSZ266-121130-
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-
1018 PM EST Mon Dec 11 2017

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY
AFTERNOON...

.REST OF TONIGHT...North gales to 45 knots with a few storm force
gusts to 50 knots through late tonight. Freezing spray. Snow
showers. Waves 10 to 14 feet occasionally to 18 feet building to
12 to 17 feet occasionally to 21 feet, then subsiding to 10 to 14
feet occasionally to 18 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots.
Freezing spray. Snow showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. Freezing spray in the evening. A chance of
snow showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. A slight chance of
snow showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of snow showers. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. A chance of snow showers. Waves building to 1 to
3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers likely in the
evening, then a chance of snow showers after midnight. Waves 1 to
3 feet.
.FRIDAY...North winds 15 to 25 knots. Snow showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY...East winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ267-121130-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1018 PM EST Mon Dec 11 2017

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY
AFTERNOON...

.REST OF TONIGHT...North gales to 45 knots. Heavy freezing spray.
Scattered snow showers. Waves 7 to 10 feet occasionally to
13 feet building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...North gales to 40 knots diminishing to 20 to 30 knots.
Heavy freezing spray. Scattered snow showers. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.WEDNESDAY...North winds 10 to 20 knots. A slight chance of snow
showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. A chance of snow showers in the morning, then snow
showers likely in the afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots veering north after
midnight. Snow showers likely. Waves building to 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots. Snow showers likely. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...East winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$
LSZ261-121130-
MAFOR 1204/
Superior West...Gale Warning in effect...11850 11740 12730 11820
13810. Freezing spray late this evening. Waves 5 to 8 feet
subsiding to 3 to 6 feet overnight, then subsiding to 1 to 3 feet
Tuesday and Tuesday evening.

Superior North Central...Gale Warning and Heavy Freezing Spray
Warning in effect...12852 11842 11847 11837 12830 11820. Heavy
freezing spray through mid Tuesday morning, then freezing spray
late Tuesday morning through Tuesday afternoon. Scattered snow
showers through late Tuesday evening. Waves 9 to 13 feet
subsiding to 7 to 10 feet overnight. Waves 6 to 9 feet subsiding
to 2 to 6 feet Tuesday and Tuesday evening.

Superior South Central...Gale Warning and Heavy Freezing Spray
Warning in effect...11867 12857 12847 12837 11827. Freezing
spray. Waves 12 to 16 feet subsiding to 10 to 14 feet overnight.
Waves 9 to 12 feet subsiding to 5 to 8 feet Tuesday. Waves 4 to 7
feet subsiding to 3 to 5 feet Tuesday evening.

Superior East...Gale Warning and Heavy Freezing Spray Warning in
effect...11860 12852 11850 12840 12830. Freezing spray late this
evening, then heavy freezing spray overnight through mid Tuesday
morning. Freezing spray from late Tuesday morning through Tuesday
evening. Scattered snow showers overnight through late Tuesday
evening. Waves 10 to 14 feet overnight. Waves 8 to 11 feet
subsiding to 3 to 6 feet Tuesday and Tuesday evening.

$$

JSS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.