Great Lakes Forecast
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FZUS63 KMQT 221336
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
936 AM EDT Tue May 22 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...Weak high pressure of 30.1 inches will set up over
the western Great Lakes today. A weak low pressure trough of 30.0
inches will then drop south across Lake Superior late tonight and
Wednesday morning. As the trough dissipates Wednesday, high
pressure of 30.2 inches will build over the Great Lakes region.
The high will drift toward the Mid-Atlantic States on Thursday as
one low pressure trough of 29.7 inches drops across far northern
Ontario and a second trough of 29.7 inches emerges over the
western Plains. Both troughs will move closer to the Upper Great
Lakes on Friday, then converge over the Upper Great Lakes on
Saturday.

LSZ162-222145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
936 AM EDT Tue May 22 2018 /836 AM CDT Tue May 22 2018/

.REST OF TODAY...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing southeast in
the afternoon, then backing east late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. A slight chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.

$$

LSZ263-222145-
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 AM EDT Tue May 22 2018

.REST OF TODAY...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering north in the
afternoon, then veering northeast late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds less than 10 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet.

$$

LSZ264-222145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
936 AM EDT Tue May 22 2018

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering southeast
late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing east. A chance
of showers and thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves 1 to 3 feet.

$$

LSZ265-222145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
936 AM EDT Tue May 22 2018

.REST OF TODAY...South winds 5 to 15 knots backing southeast
late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves building to 1 to 3 feet.

$$

LSZ266-222145-
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 AM EDT Tue May 22 2018

.REST OF TODAY...Southwest winds 5 to 15 knots veering west late.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing east. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves building to 1 to 3 feet.

$$

LSZ267-222145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
936 AM EDT Tue May 22 2018

.REST OF TODAY...South winds 5 to 15 knots veering southwest in
the afternoon, then veering northwest late. Waves calm to 2 feet.
.TONIGHT...West winds less than 10 knots becoming northwest 5 to
15 knots after midnight, then becoming east less than 10 knots
late. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing northwest late.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming southeast 5 to
15 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. A chance
of showers and thunderstorms. Waves calm to 2 feet.

$$
LSZ261-222145-
MAFOR 2215/
Superior West 12510 15500. Waves 2 feet or less.

Superior North Central 14510 11500 13400. Waves 2 feet or less.

Superior South Central 12400 12300 12400 11500 11300. Waves 1
foot or less.

Superior East 11500 11600 12700 11500 12300 11200. Waves 1 foot
or less.

$$

KEC

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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