Great Lakes Forecast
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000
FZUS63 KMQT 191950
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 PM EDT Sat May 19 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 low pressure trough averaging 29.9 inches has pushed
east of Lake Superior and will sweep into southern Quebec tonight
and deepen. A high pressure ridge of 30.2 inches will then follow
over the Upper Great Lakes Sunday into Monday, weakening to 30.1
inches on Tuesday. A weak 29.9 inch trough will then track across
the upper Great Lakes on Tuesday afternoon. A 30.1 inch ridge of
high pressure returns on Wednesday. The high shifts southeast of
the lower Great Lakes on Thursday while a low pressure system of
29.6 inches organizes over the northern Plains.

LSZ162-200400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 PM EDT Sat May 19 2018 /250 PM CDT Sat May 19 2018/

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves 1 to
3 feet.
.TONIGHT...West winds 5 to 15 knots becoming north less than
10 knots after midnight, then backing west late. Waves subsiding
to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots late. Waves calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots backing southeast by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds less than 10 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds less than 10 knots veering west
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.

$$

LSZ263-200400-
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-
350 PM EDT Sat May 19 2018

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to less than
10 knots after midnight, then becoming west 5 to 15 knots late.
Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 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...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering southeast.
Waves calm to 2 feet.

$$

LSZ264-200400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 PM EDT Sat May 19 2018

.LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight
chance of rain showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing west late. Waves subsiding
to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming southeast
5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-200400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 PM EDT Sat May 19 2018

.LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight
chance of rain showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 10 to 20 knots becoming west 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing south late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west late.
Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east 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...Southwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming south 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-200400-
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-
350 PM EDT Sat May 19 2018

.LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight
chance of rain showers. Waves 3 to 6 feet occasionally to 8 feet
building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east 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...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ267-200400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 PM EDT Sat May 19 2018

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. A slight
chance of rain showers. Waves calm to 2 feet.
.TONIGHT...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 6 feet occasionally to 8 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-200400-
MAFOR 1921/
Superior West 11320 11500 12700 12600 12510. Waves 1 to 3 feet.

Superior North Central 11830 11820 11810 11700 11600 11610 12520.
Waves 3 to 6 feet subsiding to 1 to 3 feet tonight, then building
to 3 to 5 feet Sunday.

Superior South Central 12830 12820 13600 11500. Waves 3 to 5 feet
building to 4 to 7 feet, then subsiding to 2 to 4 feet tonight.
Waves 1 to 3 feet subsiding to 1 foot or less Sunday.

Superior East 11730 13830 11710 12600 11510. Waves 1 to 2 feet
building to 3 to 6 feet, then subsiding to 2 to 4 feet tonight.
Waves 1 to 3 feet Sunday.

$$

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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