Great Lakes Forecast
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810
FZUS63 KMQT 190153
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
953 PM EDT Tue Jul 18 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...A 29.8 inch trough will move across Lake Superior
tonight into Wednesday. The trough will settle south of Lake
Superior on Wednesday afternoon while a 30.1 inch ridge builds over
the Upper Great Lakes. On Thursday into Friday afternoon another
trough at 29.8 inches will track across the Upper Great Lakes as the
ridge builds over the Ohio Valley. On Saturday morning a 29.7
inch low over the Central Plains tracks northeast and reaches the
Upper Mississippi River Valley by Sunday afternoon. A 29.6 inch
low moves across the Upper Great Lakes on Saturday night.

LSZ162-191000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
953 PM EDT Tue Jul 18 2017 /853 PM CDT Tue Jul 18 2017/

.REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing south late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots backing northeast
after midnight, then veering east late. A slight chance of
showers. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-191000-
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-
953 PM EDT Tue Jul 18 2017

.REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest 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 becoming northeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast. A chance
of showers. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing north. A chance of
showers. Waves calm to 2 feet.

$$

LSZ264-191000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
953 PM EDT Tue Jul 18 2017

.REST OF TONIGHT...West winds 5 to 15 knots. Patchy fog by late
evening. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...North winds less than 10 knots becoming northeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
building to 1 to 3 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ265-191000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
953 PM EDT Tue Jul 18 2017

.REST OF TONIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots late. Patchy fog by late evening. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing south late. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering west. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots veering east. A chance of
showers. Waves calm to 2 feet.

$$

LSZ266-191000-
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-
953 PM EDT Tue Jul 18 2017

.REST OF TONIGHT...West winds 5 to 15 knots becoming northwest
10 to 20 knots late. Isolated showers by late evening. Areas of
fog. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of showers after midnight. Waves
calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.

$$

LSZ267-191000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
953 PM EDT Tue Jul 18 2017

.REST OF TONIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots late. Areas of fog. Scattered showers. Waves calm to
2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Patchy fog through early afternoon. Waves calm to
2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots backing southeast
late. A slight chance of showers after midnight. Waves calm to
2 feet.
.THURSDAY...South winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots backing north. A chance
of showers. Waves calm to 2 feet.

$$
LSZ261-191000-
MAFOR 1903/
Superior West 13610 11600 11500 12400 11410. Waves 2 feet or
less.

Superior North Central 14610 11600 13510. Waves 1 to 2 feet.

Superior South Central 14610 12600 11500 11300. Patchy fog late
this evening. Waves 2 feet or less.

Superior East 11503 11603 12700 13600 11500. Patchy fog late
overnight. Patchy fog Wednesday morning. Waves 1 foot or less.

$$

Titus

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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