Great Lakes Forecast
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630
FZUS63 KMQT 201400
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Sun May 20 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 high pressure ridge of 30.2 inches extending from
North Dakota across northern Minnesota will move over the Upper
Great Lakes this afternoon and tonight. The ridge will then linger
over the Great Lakes region Monday and Tuesday as it weakens to
30.1 inches. A low pressure trough of 30.0 inches will then drop
south across Lake Superior Tuesday night and Wednesday morning. In
its wake, high pressure of 30.2 inches will build over northern
Ontario Wednesday. The high will settle over the Great Lakes
region on Thursday as one low pressure trough of 29.7 inches drops
south into northern Ontario and a second trough of 29.7 inches
emerges over the western Plains.

LSZ162-201945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Sun May 20 2018 /900 AM CDT Sun May 20 2018/

.REST OF TODAY...Southwest winds 5 to 15 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...Southwest winds less than 10 knots backing south in the
afternoon, then becoming east 5 to 15 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots becoming southwest less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. 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. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ263-201945-
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-
1000 AM EDT Sun May 20 2018

.REST OF TODAY...West winds 5 to 15 knots becoming southwest
10 to 20 knots in the afternoon. Waves calm to 2 feet building to
2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing northeast late.
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 southeast.
Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ264-201945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Sun May 20 2018

.REST OF TODAY...Southwest winds 10 to 20 knots. Waves calm to
2 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south late. Waves
subsiding to 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 veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...South winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ265-201945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Sun May 20 2018

.REST OF TODAY...West winds 5 to 15 knots backing south late.
Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. 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.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots becoming southwest
5 to 15 knots. Waves calm to 2 feet.

$$

LSZ266-201945-
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-
1000 AM EDT Sun May 20 2018

.REST OF TODAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing southwest late. Waves
calm to 2 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West 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...South winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-201945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Sun May 20 2018

.REST OF TODAY...North winds 5 to 15 knots backing west in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then veering southwest late. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing northeast in the
afternoon, then veering east late. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.THURSDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$
LSZ261-201945-
MAFOR 2015/
Superior West 13510 14500 11500. Waves 2 feet or less.

Superior North Central 12520 11530 12520 12510 11500. Waves 1 to
5 feet.

Superior South Central 11600 11500 12400 14500. Waves 2 feet or
less.

Superior East 11700 11610 14510 12500. Waves 1 to 2 feet.

$$

JSS

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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