Great Lakes Forecast
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267
FZUS63 KMQT 181954
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
354 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.

LSZ162-190400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
354 PM EDT Tue Jul 18 2017 /254 PM CDT Tue Jul 18 2017/

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then diminishing to 5 to 15 knots late. 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.

$$

LSZ263-190400-
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-
354 PM EDT Tue Jul 18 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.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.

$$

LSZ264-190400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
354 PM EDT Tue Jul 18 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing southwest
late. 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.

$$

LSZ265-190400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
354 PM EDT Tue Jul 18 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A slight chance of showers and thunderstorms
through midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest in the
afternoon, then becoming northeast 5 to 15 knots 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.

$$

LSZ266-190400-
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-
354 PM EDT Tue Jul 18 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Showers likely
and a chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. A chance of showers and
thunderstorms through midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots late. 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.

$$

LSZ267-190400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
354 PM EDT Tue Jul 18 2017

.LATE THIS AFTERNOON...South winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then diminishing to 5 to 15 knots late. Showers
likely and a chance of thunderstorms through midnight, then a
slight chance of showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west in the
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.

$$

LSZ261-190400-
MAFOR 1821/
Superior West 14610 12600 12500. Waves 1 to 2 feet.

Superior North Central 12510 13610 11710 12600. Chance of showers
early this evening. Waves 1 to 2 feet.

Superior South Central 11606 11600 14610 11710 11800. Chance of
thunderstorms early this evening...then chance of showers and
thunderstorms through early evening. Waves 2 feet or less.

Superior East 11406 11500 13600 12700 11610. Chance of showers
and thunderstorms through late this evening. Waves 1 foot or
less.


$$

JSS

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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