Great Lakes Forecast
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FZUS63 KMQT 171948
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
348 PM EDT Mon Jul 17 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 30.2 inches will slowly shift
southeast across the Ohio Valley. A 29.8 inch trough will cross
Lake Superior Tuesday into Wednesday. The trough will settle south
of Lake Superior on Thursday as a 30.0 inch ridge builds over the
Upper Great Lakes. On Friday another trough at 29.8 inches will
track across the Upper Great Lakes as the ridge moves over the
Ohio Valley.

LSZ162-180400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
348 PM EDT Mon Jul 17 2017 /248 PM CDT Mon Jul 17 2017/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers likely after midnight. Waves
calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest in the
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-180400-
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-
348 PM EDT Mon Jul 17 2017

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. A slight
chance of showers. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest 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...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots 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. A chance of showers. Waves
calm to 2 feet.

$$

LSZ264-180400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
348 PM EDT Mon Jul 17 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 5 to
15 knots late. A chance of showers and thunderstorms. Waves
building to 1 to 3 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. A slight chance of thunderstorms through early
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering northwest
late. A slight chance of showers through midnight. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest less
than 10 knots by mid 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 veering west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ265-180400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
348 PM EDT Mon Jul 17 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A chance of showers and thunderstorms. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming north 5 to
15 knots late. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...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 5 to 15 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots veering east. Waves calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ266-180400-
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-
348 PM EDT Mon Jul 17 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 15 to 25 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest in the
afternoon, then becoming northwest 5 to 15 knots late. A chance
of showers and a slight chance of thunderstorms. Waves subsiding
to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest late.
A slight chance of thunderstorms through midnight. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering northeast. Waves calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ267-180400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
348 PM EDT Mon Jul 17 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots. A slight chance of showers
and thunderstorms after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots becoming north 5 to
15 knots late. A chance of showers and a slight chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Showers likely and a slight chance of thunderstorms
through midnight, then a chance of showers after midnight. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing
southeast after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming west 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ261-180400-
MAFOR 1721/
Superior West 12310 11520 11526 12510 12500. Chance of showers
and thunderstorms late this evening. Chance of thunderstorms
overnight. Chance of showers and thunderstorms through mid
morning...Then chance of showers late Tuesday morning. Waves 1 to
2 feet.

Superior North Central 12320 11420 12520 12510 11600. Chance of
showers and thunderstorms overnight. Chance of showers and
thunderstorms through mid morning...Then chance of showers from
late morning on Tuesday. Waves 1 to 3 feet.

Superior South Central 11320 11330 11430 12420 11410 11510 11600.
Chance of showers and thunderstorms late tonight. Chance of
showers and thunderstorms through mid morning...Then chance of
showers from late morning on Tuesday. Waves 1 to 3 feet.

Superior East 11310 14420 11410 11510 11500. Chance of showers
Tuesday. Waves 1 to 3 feet.

$$

Beachler

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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