Great Lakes Forecast
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FZUS63 KMQT 260205
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1005 PM EDT Fri May 25 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 29.6 inch low over the northern plains will expand
into the western Great Lakes overnight. A low pressure trough will
linger across the Great Lakes through the Memorial Day weekend.
The trough will weaken to 29.9 inches on Monday as it shifts to
the lower Great Lakes. High pressure of 30.1 inches will follow
across northern Ontario and the upper Great Lakes by late Monday.
On Tuesday, the 30.1 inch high will shift over Quebec. A 29.5 inch
low tracks east out of the Dakotas on early Wednesday morning and
moves across the north half of Minnesota through the day on
Wednesday.

LSZ162-261015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1005 PM EDT Fri May 25 2018 /905 PM CDT Fri May 25 2018/

.REST OF TONIGHT...Southwest winds 5 to 15 knots diminishing to
less than 10 knots late. Patchy fog. A slight chance of
thunderstorms through late evening, then a slight chance of rain
showers. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing northeast in
the afternoon. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots becoming north
less than 10 knots after midnight, then backing southwest late.
Areas of fog. A slight chance of thunderstorms through midnight.
A slight chance of rain showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds less than 10 knots backing south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. A chance of showers
after midnight. Waves calm to 2 feet.
.MONDAY...Northwest winds less than 10 knots veering east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...East winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering south. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots veering west. Showers
likely. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-261015-
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-
1005 PM EDT Fri May 25 2018

.REST OF TONIGHT...Southwest winds 5 to 15 knots diminishing to
less than 10 knots late. Patchy fog. A slight chance of
thunderstorms through late evening, then a slight chance of rain
showers. Waves calm to 2 feet.
.SATURDAY...East winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon. Patchy fog. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots becoming north
less than 10 knots after midnight, then backing west late. Areas
of fog. A slight chance of thunderstorms through midnight. A
chance of rain showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots increasing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots becoming northeast less than
10 knots by mid afternoon. A chance of showers through early
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering south. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 5 to 15 knots. A chance of showers.
Waves subsiding to calm to 2 feet.

$$

LSZ264-261015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1005 PM EDT Fri May 25 2018

.REST OF TONIGHT...Southwest winds 5 to 15 knots diminishing to
less than 10 knots after midnight. Areas of fog. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Patchy fog through early
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight, then veering west late. Areas of fog. A slight
chance of thunderstorms through midnight. A chance of rain
showers. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. A
chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ265-261015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1005 PM EDT Fri May 25 2018

.REST OF TONIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Areas of fog. A slight chance of
showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...South winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Patchy fog. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight, then veering west late. Areas of fog. A slight
chance of thunderstorms through midnight. A chance of rain
showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ266-261015-
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-
1005 PM EDT Fri May 25 2018

.REST OF TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Areas of fog. A slight chance of showers
and thunderstorms. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Patchy fog. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. Areas of fog. A chance of rain showers and a slight chance
of thunderstorms. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. A slight chance of rain
showers through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-261015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1005 PM EDT Fri May 25 2018

.REST OF TONIGHT...South winds 10 to 20 knots. Widespread fog. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Areas of fog.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Areas of fog. A chance of rain
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots veering west by mid
afternoon. A slight chance of rain showers through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.

$$
LSZ261-261015-
MAFOR 2603/
Superior West 13500 11400 13100 11103. Chance of rain showers and
thunderstorms late Saturday. Waves 1 foot or less.

Superior North Central 11500 11503 11403 12200 11210 11200 11203.
Chance of showers and thunderstorms through early evening, then
chance of showers late Saturday evening. Waves 2 feet or less.

Superior South Central 11410 12503 11400 11300 11203 11200 11303.
Patchy fog late Saturday morning, then patchy fog in the evening.
Chance of showers and thunderstorms late Saturday, then chance of
showers late Saturday evening. Waves 2 feet or less.

Superior East 11413 12403 12300 12203 11303. Chance of showers
and thunderstorms overnight through mid morning Saturday. Chance
of showers and thunderstorms through early evening, then chance of
showers late Saturday evening. Waves 1 to 2 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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