Great Lakes Forecast
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FZUS63 KMQT 101955
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 PM EDT Thu Aug 10 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 29.9 inch low pressure over northwest Wisconsin
and southwest Upper Michigan will reach eastern Ontario Friday
night while deepening to 29.8 inches. A 30.1 inch high pressure
over the northern Plains Saturday morning will move over the
western Great Lakes Sunday, then remain nearly stationary through
Tuesday.

LSZ162-110400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 PM EDT Thu Aug 10 2017 /255 PM CDT Thu Aug 10 2017/

...GALE WARNING IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS
EVENING...

.LATE THIS AFTERNOON...Northeast gales to 35 knots. Patchy fog. A
chance of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming north 10 to
20 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...North winds 5 to 15 knots veering south late. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering northwest
late. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-110400-
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 PM EDT Thu Aug 10 2017

.LATE THIS AFTERNOON...Northeast winds 20 to 30 knots with gale
force gusts to 35 knots. Patchy fog. A chance of showers. Waves 3
to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 15 to 25 knots backing north after
midnight, then diminishing to 10 to 20 knots late. Patchy fog
through midnight. A slight chance of showers. Waves subsiding to
2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest late.
Waves calm to 2 feet.
.SATURDAY...West winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ264-110400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 PM EDT Thu Aug 10 2017

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Patchy
fog. A chance of showers and a slight chance of thunderstorms.
Waves 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots. Patchy fog through
midnight. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
late. A slight chance of showers through early afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north late.
Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ265-110400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 PM EDT Thu Aug 10 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Areas of fog.
Showers likely and a slight chance of thunderstorms. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots backing north late.
Areas of fog. Showers likely and a slight chance of thunderstorms
through midnight. A slight chance of showers after midnight.
Waves 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots. Areas of fog through early
afternoon. A slight chance of showers. Waves 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ266-110400-
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 PM EDT Thu Aug 10 2017

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Patchy fog.
Showers likely and a chance of thunderstorms. Waves 1 to 3 feet
building to 2 to 4 feet.
.TONIGHT...Southeast winds 10 to 20 knots backing northeast late.
Areas of fog. Showers likely and a chance of thunderstorms
through midnight. A chance of showers after midnight. Waves 2 to
4 feet.
.FRIDAY...North winds 10 to 20 knots. Patchy fog through early
afternoon. A chance of showers. Waves 2 to 4 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A slight chance of
showers through midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ267-110400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 PM EDT Thu Aug 10 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Showers
likely and a chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming east 5 to
15 knots late. Areas of fog. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north in the
afternoon, then increasing to 15 to 25 knots late. Areas of fog
through early afternoon. A slight chance of thunderstorms through
early afternoon. A chance of showers. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of showers. Waves 1 to
3 feet.
.SATURDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ261-110400-
MAFOR 1021/
Superior West...Gale Warning in effect...11150 12130 13820 11810
11100. Patchy fog this evening. Chance of showers this evening.
Waves 3 to 6 feet subsiding to 2 to 4 feet tonight. Waves 2 to 4
feet subsiding to 1 to 3 feet Friday.

Superior North Central 11136 11120 12130 11120 13820. Patchy fog
through late Friday morning. Chance of showers through the early
overnight. Waves 2 to 5 feet.

Superior South Central 11216 11226 11223 12123 11823 12820.
Patchy fog early this evening. Chance of thunderstorms this
evening. Chance of showers overnight through Friday morning.
Waves 1 to 4 feet.

Superior East 12326 11320 11210 11213 11113 11110 11820. Patchy
fog. Chance of thunderstorms this evening...Then chance of
showers overnight through early afternoon Friday. Waves 1 to 3
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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