Great Lakes Forecast
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FZUS63 KMQT 230752
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
352 AM EDT Mon Apr 23 2018

For waters beyond 5 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 ridge of 30.4 inches over New England and the
eastern Great Lakes will shift slowly off the Eastern Seaboard
today. A 30.1 inch trough will follow across Lake Superior tonight
into Tuesday. Another high pressure ridge of 30.2 inches will
follow on Wednesday. As the second ridge exits on Wednesday
evening, a trough of 29.8 inches moves into northern Ontario
through Wednesday night and then sweeps across Lake Superior
through Thursday. A 30.1 inch ridge shifts over the upper Great
Lakes on Friday as a 29.7 inch low over northwestern Ontario
tracks southward into the upper Great Lakes on early Saturday
morning.

LSZ162-231600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
352 AM EDT Mon Apr 23 2018 /252 AM CDT Mon Apr 23 2018/

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming northwest less
than 10 knots after midnight, then becoming north 5 to 15 knots
late. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming west less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds less than 10 knots becoming south
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering north. A chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-231600-
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-
352 AM EDT Mon Apr 23 2018

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TODAY...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west less than
10 knots after midnight, then becoming north 5 to 15 knots late.
Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing west late. Waves
calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves building to
1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots becoming north 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ264-231600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
352 AM EDT Mon Apr 23 2018

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...Southwest winds 10 to 20 knots. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then becoming north 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering north. A
chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ265-231600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
352 AM EDT Mon Apr 23 2018

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then veering northwest late. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming north 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-231600-
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-
352 AM EDT Mon Apr 23 2018

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TODAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering southwest late. Waves calm
to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming north 15 to
25 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-231600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
352 AM EDT Mon Apr 23 2018

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering northwest in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of drizzle by mid afternoon. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. A slight chance of drizzle through midnight.
Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. A chance of snow showers.
Waves building to 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-231600-
MAFOR 2309/
Superior West 14510 11510 12500 11700. Waves 2 feet or less.

Superior North Central 11510 12520 14510 11600. Waves 1 to 3
feet.

Superior South Central 11510 12410 13400 11410 11500. Waves 2
feet or less.

Superior East 14410 12400 12410. Waves 1 to 3 feet today. Waves 2
feet or less tonight.

$$

JLB

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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