Great Lakes Forecast
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FZUS63 KMQT 190136
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
936 PM EDT Fri May 18 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...High pressure of 30.4 inches over southern Quebec
will shift east off the New England coast on Saturday morning as a
low pressure trough averaging 29.9 inches reaches the central
Plains and extends to western Lake Superior. This trough will
sweep across Lake Superior on Saturday and reach the lower Great
Lakes on Sunday. A high pressure ridge of 30.2 inches will follow
over the Upper Great Lakes Sunday into Monday, weakening to 30.1
inches on Tuesday. A weak 29.9 inch trough moves into the upper
Great Lakes on Tuesday afternoon. A 30.2 inch ridge of high
pressure returns over the upper Great Lakes on Wednesday.

LSZ162-190945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
936 PM EDT Fri May 18 2018 /836 PM CDT Fri May 18 2018/

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering east
late. A slight chance of rain showers after midnight. Waves 1 to
3 feet subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then veering northeast late. A chance
of rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing north after
midnight, then diminishing to less than 10 knots late. Waves calm
to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds less than 10 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-190945-
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-
936 PM EDT Fri May 18 2018

.REST OF TONIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots diminishing to less
than 10 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ264-190945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
936 PM EDT Fri May 18 2018

.REST OF TONIGHT...Southeast winds 20 to 30 knots diminishing to
10 to 20 knots late. Waves 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.SATURDAY...Southeast winds 10 to 20 knots backing north in the
afternoon, then increasing to 15 to 25 knots late. A chance of
rain showers. Waves subsiding to 1 to 3 feet, then building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ265-190945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
936 PM EDT Fri May 18 2018

.REST OF TONIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves 2 to 4 feet subsiding to
1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then becoming north 15 to 25 knots late. A chance of
rain showers. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ266-190945-
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-
936 PM EDT Fri May 18 2018

.REST OF TONIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.SATURDAY...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming north 15 to 25 knots
late. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. A slight chance of rain showers through midnight. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

$$

LSZ267-190945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
936 PM EDT Fri May 18 2018

.REST OF TONIGHT...Southeast winds 15 to 25 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming east 10 to 20 knots
late. A chance of rain showers. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A slight chance of rain showers through midnight. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$
LSZ261-190945-
MAFOR 1903/
Superior West 12320 12200 11810 13120. Chance of rain showers
from late morning through early evening Saturday. Waves 1 to 3
feet.

Superior North Central 11340 11330 11320 11310 11210 13830.
Chance of rain showers Saturday afternoon through early evening.
Waves 3 to 6 feet.

Superior South Central 13320 12310 11110 11730 11830. Chance of
rain showers late Saturday. Waves 1 to 4 feet overnight and
Saturday. Waves 2 to 4 feet building to 3 to 5 feet Saturday
evening.

Superior East 11330 13320 11310 11200 11120 11820. Chance of rain
showers late Saturday. Waves 1 to 4 feet.

$$

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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