Great Lakes Forecast
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FZUS63 KMQT 042028
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
328 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 29.3 inches near the Twin Cities will
deepen to 29.0 inches as it passes over western Lake Superior this
evening and to 28.7 inches as it tracks over northern Ontario on
Tuesday. The low will weaken to 29.1 inches over James Bay on
Wednesday and then track into northern Quebec on Thursday while high
pressure of 30.8 inches remains over the northern 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.

LSZ162-050430-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
328 PM EST Mon Dec 4 2017 /228 PM CST Mon Dec 4 2017/

...STORM WARNING IN EFFECT FROM 11 PM EST /10 PM CST/ THIS
EVENING THROUGH TUESDAY EVENING...

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Widespread fog.
Rain showers and a slight chance of thunderstorms. Waves 1 to
3 feet.
.TONIGHT...East winds 5 to 15 knots becoming west gales to 35
knots by midnight, then increasing to storm force winds to 55
knots late. Widespread fog. Rain showers. Numerous snow showers
after midnight. Waves 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.

$$

LSZ263-050430-
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-
328 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM 11 PM EST THIS EVENING THROUGH
TUESDAY EVENING...

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Widespread
fog. Rain showers and a slight chance of thunderstorms. Waves
3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south gales to
40 knots by midnight, then becoming west storm force winds to
55 knots late. Widespread fog. Rain showers. Snow showers after
midnight. Waves 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. 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.

$$

LSZ264-050430-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
328 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM 11 PM EST THIS EVENING THROUGH
TUESDAY EVENING...

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Widespread
fog. Rain showers and a slight chance of thunderstorms. Waves
4 to 8 feet occasionally to 10 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then becoming southwest storm force winds
to 50 knots late. Widespread fog. A slight chance of
thunderstorms in the evening. Rain showers. Snow showers after
midnight. Waves building to 10 to 14 feet occasionally to
18 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.

$$

LSZ265-050430-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
328 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM 11 PM EST THIS EVENING THROUGH
TUESDAY EVENING...

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Widespread
fog. Showers and a slight chance of thunderstorms. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to 25
knots by midnight, then becoming southwest gales to 45 knots late.
Occasional storm force gusts to 50 knots late tonight. Widespread
fog in the evening. Patchy fog after midnight. Drizzle likely and
a slight chance of thunderstorms in the evening. Numerous rain
showers. A chance of drizzle and scattered snow showers after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 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.

$$

LSZ266-050430-
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-
328 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY
EVENING...

.LATE THIS AFTERNOON...South winds 15 to 25 knots. Widespread
fog. Showers and a slight chance of thunderstorms. Waves 5 to
8 feet occasionally to 10 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to 30
knots by midnight, then becoming southwest gales to 40 knots late.
Occasional storm force wind gusts to 50 knots late. Widespread
fog in the evening. Patchy fog after midnight. Drizzle likely and
a slight chance of thunderstorms in the evening. Numerous rain
showers. A chance of drizzle after midnight. Waves subsiding to 4
to 7 feet occasionally to 9 feet, then building to 7 to 10 feet
occasionally to 13 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.

$$

LSZ267-050430-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
328 PM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY
EVENING...

.LATE THIS AFTERNOON...Southeast winds 20 to 30 knots. Widespread
fog. Showers. Waves 5 to 9 feet occasionally to 11 feet.
.TONIGHT...South winds 15 to 25 knots increasing to gales to 35
knots. Occasional storm force wind gusts to 50 knots late.
Widespread fog in the evening, then areas of fog after midnight.
Rain showers and a slight chance of thunderstorms in the evening,
then a chance of drizzle and scattered rain showers after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 6 to 9 feet occasionally to 11 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.

$$

LSZ261-050430-
MAFOR 0422/
Superior West...Storm Warning in effect...11216 11316 11646 14677
11677. Freezing spray Tuesday. Waves 1 to 3 feet building to 9 to
12 feet tonight. Waves 11 to 15 feet Tuesday.

Superior North Central...Storm Warning in effect...12326 11436
11456 14677. Patchy fog through mid morning. Freezing spray
Tuesday afternoon. Waves 5 to 8 feet building to 6 to 9 feet
tonight. Waves 13 to 17 feet building to 15 to 20 feet, then
subsiding to 14 to 18 feet Tuesday.

Superior South Central...Storm Warning in effect...11326 12436
11443 11570 11670 12677. Patchy fog late. Chance of drizzle
overnight. Patchy fog through mid morning. Freezing spray Tuesday
afternoon. Scattered snow showers with a chance of drizzle
through mid morning, then scattered snow showers late Tuesday
morning. Waves 3 to 6 feet building to 4 to 7 feet tonight. Waves
10 to 14 feet building to 11 to 16 feet.

Superior East...Storm Warning in effect...11336 13436 11566
13577. Chance of drizzle overnight. Scattered snow showers with a
chance of drizzle through mid morning Tuesday. Waves 5 to 9 feet
tonight. Waves 10 to 14 feet building to 16 to 21 feet Tuesday.

$$

07

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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