Great Lakes Forecast
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FZUS63 KMQT 280141
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
941 PM EDT Tue Jun 27 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 30.2 inch high pressure centered over the Central
Appalachians tonight will reach the East Coast Wednesday morning.
A 29.4 inch trough across the Northern Plains tonight will drift
across Lake Superior Wednesday afternoon into Thursday. A 29.6
inch trough will then linger over the Upper Great Lakes into
Saturday night. The trough will lift to the northeast on Sunday
ahead of a 30.1 inch ridge building across the Upper Mississippi
Valley.

LSZ162-280945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
941 PM EDT Tue Jun 27 2017 /841 PM CDT Tue Jun 27 2017/

.REST OF TONIGHT...South winds 5 to 15 knots. A slight chance of
rain showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. Showers likely and a slight chance of thunderstorms. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight, then backing west late. Rain showers likely and a
slight chance of thunderstorms through midnight, then a chance of
rain showers after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-280945-
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-
941 PM EDT Tue Jun 27 2017

.REST OF TONIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers through early afternoon. A slight chance of
thunderstorms. Showers likely by mid afternoon. Waves building to
1 to 3 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight, then backing west late. Rain showers likely and a
slight chance of thunderstorms through midnight, then a chance of
rain showers after midnight. Waves 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. A chance of rain showers through early afternoon.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds less than 10 knots becoming
northeast 5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds less than 10 knots increasing to
5 to 15 knots after midnight. A chance of showers. Waves calm to
2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-280945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
941 PM EDT Tue Jun 27 2017

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves 1 to 3 feet subsiding to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
rain showers through early afternoon, then rain showers likely by
mid afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots backing east
after midnight, then becoming northeast 5 to 15 knots late. Rain
showers likely. Waves building to 2 to 4 feet.
.THURSDAY...North winds 5 to 15 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. A chance of
rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-280945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
941 PM EDT Tue Jun 27 2017

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

$$

LSZ266-280945-
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-
941 PM EDT Tue Jun 27 2017

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

$$

LSZ267-280945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
941 PM EDT Tue Jun 27 2017

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

$$
LSZ261-280945-
MAFOR 2803/
Superior West 13410 11310 11226 12236 11216. Waves 1 to 2 feet.

Superior North Central 11410 11510 11500 11410 11310 13326.
Chance of showers early Wednesday afternoon. Waves 1 to 4 feet.

Superior South Central 14410 11320 13326. Chance of showers late
Wednesday morning. Waves 1 to 4 feet.

Superior East 12410 11510 12410 11426 11326 11336. Chance of
showers early Wednesday afternoon. Waves 1 to 3 feet.

$$

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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