Great Lakes Forecast
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443
FZUS63 KMQT 231936
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
336 PM 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 extending from the Great
Lakes to New England will slide eastward tonight. A 30.1 inch trough
will cross Lake Superior tonight into Tuesday. Another high pressure
ridge of 30.2 inches will reach the western Great Lakes on
Wednesday. A 29.7 inch trough over northern Ontario Thursday will
reach eastern Ontario by Friday. A 29.7 inch low over southern
Manitoba Friday morning will dissipate over northern Illinois
Saturday morning. A 30.2 inch high pressure ridge over northern
Ontario Saturday morning will move over the Great lakes Sunday.

LSZ162-240345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
336 PM EDT Mon Apr 23 2018 /236 PM CDT Mon Apr 23 2018/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering northwest after
midnight, then veering north late. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing west in the
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...South winds less than 10 knots increasing to 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...Southwest winds 5 to 15 knots veering north by mid
afternoon. A chance of rain. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ263-240345-
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-
336 PM EDT Mon Apr 23 2018

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then veering north 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 veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A chance of rain. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing north. Waves calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ264-240345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
336 PM EDT Mon Apr 23 2018

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then becoming north 10 to 20 knots late.
Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
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 west by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest 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 veering north by mid
afternoon. A chance of rain. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY 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 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots backing north. Waves
subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves
building to 1 to 3 feet.

$$

LSZ265-240345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
336 PM EDT Mon Apr 23 2018

.LATE THIS AFTERNOON...South winds 5 to 15 knots. 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 calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
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 veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming northwest
10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY 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.
.FRIDAY...East winds 5 to 15 knots backing northwest. Waves
subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves
building to 1 to 3 feet.

$$

LSZ266-240345-
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-
336 PM EDT Mon Apr 23 2018

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots 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 2 to 4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming northwest
10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY 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.
.FRIDAY...North winds 5 to 15 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves
building to 1 to 3 feet.

$$

LSZ267-240345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
336 PM EDT Mon Apr 23 2018

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. 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 rain showers by mid afternoon. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. A slight chance of rain and snow through
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing
southwest after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots after midnight. A chance of rain, possibly mixed
with snow through midnight. Waves building to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ261-240345-
MAFOR 2321/
Superior West 11520 11510 11610 11710 11820 11810 11700 11600.
Waves 2 feet or less.

Superior North Central 12520 11510 11600 13810 11710. Waves 1 to
3 feet.

Superior South Central 13400 11500 11700 12810 11710. Waves 1
to 3 feet.

Superior East 11400 12410 12500 11600 11710 11720. Waves 1
to 3 feet.

$$

RJT

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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