Great Lakes Forecast
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FZUS63 KMQT 130136
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
936 PM EDT Sun Jul 12 2020

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 30.0 inch ridge will be over the Upper Great Lakes
tonight through Monday. The ridge will shift east Tuesday into
early Wednesday as a 29.7 inch trough lifts northeastward across
Lake Superior. Ridging will return on Thursday with a surface
pressure ridge of 30.0 inches building over Lake Superior.

LSZ162-130945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
936 PM EDT Sun Jul 12 2020 /836 PM CDT Sun Jul 12 2020/

.REST OF TONIGHT...South winds 5 to 15 knots becoming southeast
less than 10 knots after midnight, then increasing to 5 to
15 knots late. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering south after
midnight. A chance of showers through midnight. A slight chance
of thunderstorms. Showers likely after midnight. Waves 1 to
3 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. Showers likely and a slight chance of thunderstorms.
Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing east. A chance of
showers. A chance of thunderstorms. Waves calm to 2 feet.

$$

LSZ263-130945-
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 Sun Jul 12 2020

.REST OF TONIGHT...South winds 5 to 15 knots backing southeast
after midnight, then diminishing to less than 10 knots late.
Waves calm to 2 feet.
.MONDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering south late. A
slight chance of showers through midnight, then showers likely
and a slight chance of thunderstorms after midnight. Waves 1 to
3 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. Showers and a slight chance of thunderstorms. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A chance of showers through midnight. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots. A chance of showers. A chance of thunderstorms. Waves
calm to 2 feet.

$$

LSZ264-130945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
936 PM EDT Sun Jul 12 2020

.REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Northwest winds less than 10 knots becoming east 5 to
15 knots in the afternoon, then veering southeast late. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers after midnight. Waves building to 2 to 4 feet.
.TUESDAY...South winds 10 to 20 knots. Showers and a slight
chance of thunderstorms. Waves 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.

$$

LSZ265-130945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
936 PM EDT Sun Jul 12 2020

.REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...North winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. A slight chance
of showers after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers. A slight chance of
thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ266-130945-
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 Sun Jul 12 2020

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves 1 to 3 feet subsiding to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering north in the
afternoon, then veering east late. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon, then showers likely and a slight chance of
thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves calm to 2 feet.

$$

LSZ267-130945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
936 PM EDT Sun Jul 12 2020

.REST OF TONIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves 1 to 3 feet subsiding to calm to
2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots. Showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves calm to 2 feet.

$$
LSZ261-130945-
MAFOR 1303/
Superior West 14300 11200 11210 12220. Waves 2 feet or less
overnight and Monday. Waves 1 to 3 feet Monday evening.

Superior North Central 11610 11710 12700 11800 11210 12310. Waves
2 feet or less.

Superior South Central 12600 12700 11800 11210 12310. Waves 1
foot or less.

Superior East 12710 13700 12600 11800. Waves 1 to 3 feet.

$$

JH

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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