Great Lakes Forecast
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FZUS63 KMQT 250755
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 AM EDT Tue Jul 25 2017

For waters beyond five 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...High pressure of 30.0 inches moving over the Upper
Great Lakes will persist through this afternoon. A low pressure
trough of 29.8 inches will then move across Lake Superior late
tonight and Wednesday. A 30.0 inch high pressure ridge will then
build back into the Upper Great Lakes on Thursday and persist
through the weekend.

LSZ162-251600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 AM EDT Tue Jul 25 2017 /255 AM CDT Tue Jul 25 2017/

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing southeast in the
afternoon, then becoming south 10 to 20 knots late. A slight
chance of showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then increasing to 10 to 20 knots late. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west in the
afternoon, then diminishing to 5 to 15 knots late. A slight
chance of showers through early afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds less than 10 knots veering northwest
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering west. Waves calm to
2 feet.

$$

LSZ263-251600-
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-
355 AM EDT Tue Jul 25 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight. A chance of showers and thunderstorms.
Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 5 to 15 knots. A slight chance of showers
through early afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots becoming west
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds less than 10 knots. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-251600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 AM EDT Tue Jul 25 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then backing southeast late. A slight chance of
showers by mid afternoon. Waves building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming southwest 10 to 20 knots
late. A chance of showers and thunderstorms. Waves building to
2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers and thunderstorms
through early afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...North winds less than 10 knots backing southwest. Waves
calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-251600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 AM EDT Tue Jul 25 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots backing southeast in the
afternoon, then veering south late. A slight chance of showers by
mid afternoon. Waves building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late. A
chance of showers through midnight, then showers likely and a
chance of thunderstorms after midnight. Waves 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-251600-
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-
355 AM EDT Tue Jul 25 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TONIGHT...South winds 15 to 25 knots. A chance of showers
through midnight, then showers likely and a chance of
thunderstorms after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Showers likely through early afternoon. A slight chance of
thunderstorms. A slight chance of showers by mid afternoon. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. A slight chance of showers through midnight. Waves
subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.

$$

LSZ267-251600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 AM EDT Tue Jul 25 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots in the afternoon, then becoming south 10 to 20 knots
late. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots. A chance of showers through midnight, then showers
likely and a slight chance of thunderstorms after midnight. Waves
building to 2 to 4 feet.
.WEDNESDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots in the afternoon, then becoming west 10 to 20 knots
late. Showers likely through early afternoon. A chance of
thunderstorms. A chance of showers by mid afternoon. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. A slight chance of showers through midnight. Waves calm
to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ261-251600-
MAFOR 2509/
Superior West 13410 11310 12420 11410 11520. Chance of showers
and thunderstorms tonight. Waves 1 to 2 feet.

Superior North Central 13410 12320 12420 11520. Chance of showers
and thunderstorms tonight. Waves 1 to 3 feet.

Superior South Central 12410 11310 12320 12420 11426. Chance of
showers and thunderstorms tonight. Waves 1 to 3 feet.

Superior East 13410 11310 11320 12420 11436. Chance of showers
tonight. Waves 1 to 4 feet.

$$

JLA

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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