Great Lakes Forecast
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FZUS63 KMQT 050242
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
942 PM EST Mon Dec 4 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...Low pressure of 29.2 inches over western Lake Superior
will deepen to 28.7 inches as it tracks over northern Ontario on
Tuesday. The low will weaken to 29.2 inches over James Bay on
Wednesday and then track into northern Quebec on Thursday while
high pressure of 30.8 inches remains over the Colorado Rockies.
On Friday, a low pressure trough of 29.7 inches will drop
southeast across Lake Superior. In its wake, a high pressure ridge
of 30.1 inches will quickly pass across the western Great Lakes
ahead of the next low pressure trough of 29.6 inches dropping
southeast into northern Ontario late Saturday.

LSZ162-051045-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
942 PM EST Mon Dec 4 2017 /842 PM CST Mon Dec 4 2017/

...STORM WARNING IN EFFECT THROUGH TUESDAY EVENING...

.REST OF TONIGHT...North winds 15 to 25 knots becoming west gales
to 40 knots by midnight, then increasing to storm force winds to
55 knots late. Widespread fog late in the evening. Scattered
showers and isolated thunderstorms late in the evening. Snow
showers after midnight. Waves 1 to 3 feet building to 10 to 14
feet occasionally to 18 feet.
.TUESDAY...West storm force winds to 50 knots. Freezing spray.
Scattered snow showers. Waves 10 to 14 feet occasionally to 18
feet.
.TUESDAY NIGHT...West storm force winds to 50 knots diminishing
to gales to 40 knots by midnight, then becoming northwest gales
to 35 knots late. Freezing spray. Scattered snow showers. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. Freezing spray in
the morning. Scattered snow showers. Waves subsiding to 4 to
7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Scattered snow showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots. Scattered snow
showers. Waves 1 to 3 feet.
.FRIDAY...Northwest winds 15 to 25 knots veering north. Scattered
snow showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots. Scattered snow showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ263-051045-
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-
942 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT THROUGH TUESDAY EVENING...

.REST OF TONIGHT...South winds 10 to 20 knots becoming southwest
gales to 40 knots by midnight, then becoming west storm force
winds to 55 knots late. Widespread fog. Scattered showers and isolated
thunderstorms late in the evening. Snow showers after midnight.
Waves 3 to 5 feet occasionally to 7 feet building to 12 to 17 feet
occasionally to 21 feet.
.TUESDAY...West storm force winds to 55 knots. Freezing spray.
Snow showers. Waves building to 15 to 20 feet occasionally to
25 feet.
.TUESDAY NIGHT...West storm force winds to 55 knots diminishing
to gales to 45 knots by midnight. Freezing spray. Snow showers.
Waves subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Freezing spray. Numerous snow showers
in the morning. Scattered snow showers in the afternoon. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots becoming north
15 to 25 knots after midnight. Freezing spray in the evening.
Scattered snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Scattered snow
showers. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots. Scattered snow
showers in the evening, then numerous snow showers after
midnight. Waves 2 to 4 feet.
.FRIDAY...Northwest winds 15 to 25 knots veering north. Numerous
snow showers, then scattered snow showers. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west.
Scattered snow showers. Waves subsiding to 1 to 3 feet, then
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-051045-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
942 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT THROUGH TUESDAY EVENING...

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming south
20 to 30 knots by midnight, then becoming southwest storm force
winds to 55 knots late. Widespread fog. Scattered showers and
isolated thunderstorms late in the evening. Numerous snow showers
after midnight. Waves 4 to 7 feet occasionally to 9 feet building
to 11 to 15 feet occasionally to 19 feet.
.TUESDAY...West storm force winds to 55 knots. Freezing spray.
Snow showers. Waves building to 15 to 20 feet occasionally to
25 feet.
.TUESDAY NIGHT...West storm force winds to 55 knots diminishing
to gales to 45 knots by midnight. Freezing spray. Numerous snow
showers. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.WEDNESDAY...Northwest gales to 35 knots. Freezing spray.
Numerous snow showers in the morning. Scattered snow showers in
the afternoon. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.WEDNESDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Scattered snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Scattered snow showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Scattered snow showers in the evening, then
numerous snow showers after midnight. Waves 2 to 4 feet.
.FRIDAY...Northwest winds 20 to 30 knots veering north. Numerous
snow showers, then scattered snow showers. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 15 to
25 knots. Scattered snow showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-051045-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
942 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT THROUGH TUESDAY EVENING...

.REST OF TONIGHT...Southeast winds 15 to 25 knots becoming south
20 to 30 knots by midnight, then becoming southwest storm force
winds to 55 knots late. Widespread fog. Isolated showers and
thunderstorms late in the evening. Areas of drizzle and scattered
snow showers after midnight. Waves 3 to 5 feet occasionally to 7
feet building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...West storm force winds to 55 knots. Numerous snow
showers. Freezing spray in the afternoon. Waves building to 11 to
15 feet occasionally to 19 feet, then subsiding to 10 to 14 feet
occasionally to 18 feet.
.TUESDAY NIGHT...West storm force winds to 55 knots diminishing
to gales to 45 knots by midnight. Freezing spray. Numerous snow
showers. Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...Northwest gales to 40 knots. Freezing spray in the
morning. Snow showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. Numerous snow showers. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Scattered snow showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Scattered snow
showers. Waves 2 to 4 feet.
.FRIDAY...West winds 20 to 30 knots veering north. Snow showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots. Numerous snow showers, then scattered snow showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ266-051045-
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-
942 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM 4 AM EST TUESDAY THROUGH TUESDAY
EVENING...

.REST OF TONIGHT...South winds 15 to 25 knots increasing to gales
to 35 knots by midnight, then becoming southwest storm force
winds to 50 knots late. Widespread fog. Isolated showers and
thunderstorms late in the evening, then areas of drizzle after
midnight. Waves 4 to 7 feet occasionally to 9 feet building to 8
to 11 feet occasionally to 14 feet.
.TUESDAY...West storm force winds to 55 knots. Scattered snow
showers and a chance of drizzle in the morning, then snow showers
in the afternoon. Freezing spray in the afternoon. Waves building
to 17 to 22 feet occasionally to 28 feet, then subsiding to 15 to
20 feet occasionally to 25 feet.
.TUESDAY NIGHT...West storm force winds to 55 knots diminishing
to gales to 45 knots by midnight. Freezing spray. Snow showers.
Waves subsiding to 12 to 17 feet occasionally to 21 feet.
.WEDNESDAY...Northwest gales to 35 knots. Freezing spray in the
morning. Snow showers. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots. Snow showers.
Freezing spray after midnight. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Freezing spray in the morning.
Numerous snow showers in the morning, then scattered snow showers
in the afternoon. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Numerous snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 20 to 30 knots veering north. Snow showers.
Freezing spray. Waves building to 4 to 7 feet occasionally to
9 feet.
.SATURDAY...North winds 15 to 25 knots becoming west 20 to 30
knots. Freezing spray. Numerous snow showers. Waves subsiding to 2
to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-051045-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
942 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM 4 AM EST TUESDAY THROUGH TUESDAY
EVENING...

.REST OF TONIGHT...Southeast winds 20 to 30 knots becoming south
gales to 45 knots by midnight. Occasional storm force wind gusts
to 50 knots late. Areas of fog. Isolated showers and thunderstorms
late in the evening, then areas of drizzle after midnight. Waves
3 to 6 feet occasionally to 8 feet building to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...Southwest gales to 45 knots veering west by mid
afternoon. Occasional storm force wind gusts to 55 knots.
Scattered snow showers and a chance of drizzle in the morning,
then numerous snow showers in the afternoon. Waves building to 15
to 20 feet occasionally to 25 feet.
.TUESDAY NIGHT...West gales to 45 knots. Occasional storm force
wind gusts to 55 knots in the evening. Snow showers. Waves
subsiding to 12 to 17 feet occasionally to 21 feet.
.WEDNESDAY...West gales to 40 knots veering northwest in the
afternoon. Snow showers. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots becoming north
20 to 30 knots after midnight. Snow showers. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Numerous snow showers in the morning,
then scattered snow showers in the afternoon. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Numerous snow showers. Waves 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...West winds 15 to 25 knots becoming north 20 to
30 knots. Numerous snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...North winds 15 to 25 knots backing west. Scattered
snow showers. Waves subsiding to 1 to 3 feet, then building to
3 to 5 feet occasionally to 7 feet.

$$
LSZ261-051045-
MAFOR 0504/
Superior West...Storm Warning in effect...11646 11667 14677
12670. Freezing spray. Scattered snow showers late Tuesday. Waves
around 2 feet building to 9 to 12 feet overnight. Waves 10 to 16
feet Tuesday and Tuesday evening.

Superior North Central...Storm Warning in effect...11446 11566
15677. Freezing spray Tuesday afternoon and Tuesday evening.
Waves 5 to 8 feet building to 8 to 11 feet overnight. Waves 13 to
17 feet building to 15 to 20 feet Tuesday and Tuesday evening.

Superior South Central...Storm Warning in effect...11345 11455
11575 11670 14677. Chance of rain late this evening, then chance
of rain with areas of drizzle after midnight. Freezing spray
Tuesday afternoon and evening. Scattered snow showers Tuesday
morning. Waves 3 to 8 feet overnight. Waves 10 to 16 feet
Tuesday and Tuesday evening.

Superior East...Storm Warning in effect...12455 11575 13577
12677. Chance of rain late this evening, then chance of rain with
areas of drizzle after midnight. Scattered snow showers with
areas of drizzle late tonight through mid morning Tuesday. Waves
5 to 9 feet overnight. Waves 10 to 14 feet building to 16 to 22
feet Tuesday and Tuesday evening.

$$

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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