Great Lakes Forecast
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FZUS63 KMQT 161947
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
347 PM EDT Wed Aug 16 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...Low pressure of 29.6 inches over the Central Plains
will track across the Upper Great Lakes on Thursday and reach
southwest Quebec Friday night. In its wake, high pressure of 30.0
inches will shift east to the western Great Lakes late Friday and
then expand over the Great Lakes region Saturday into Sunday.

LSZ162-170400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 PM EDT Wed Aug 16 2017 /247 PM CDT Wed Aug 16 2017/

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Scattered
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 15 to 25 knots veering east after
midnight, then backing northeast late. Isolated showers through
midnight, then showers and a slight chance of thunderstorms after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then backing north late. Showers
through early afternoon. Isolated thunderstorms. Scattered
showers by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then backing northwest late. A chance of
showers. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. 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 increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing northwest. A
chance of showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ263-170400-
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-
347 PM EDT Wed Aug 16 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Isolated
showers. Waves 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots
late. Patchy fog through midnight. Scattered showers. A slight
chance of thunderstorms after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...East winds 15 to 25 knots backing northeast late.
Numerous showers through early afternoon. Scattered
thunderstorms. Scattered showers by mid afternoon. Waves building
to 5 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots backing north
after midnight, then diminishing to 10 to 20 knots late. Showers
likely through midnight, then a chance of showers after midnight.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. A slight chance of showers through early afternoon.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. 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. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ264-170400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 PM EDT Wed Aug 16 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Patchy fog through midnight. Isolated showers
after midnight. Waves building to 2 to 4 feet.
.THURSDAY...East winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Showers through early afternoon.
Isolated thunderstorms. Scattered showers by mid afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots becoming northeast
10 to 20 knots after midnight, then backing north late. Showers
likely and a slight chance of thunderstorms through midnight,
then a chance of showers after midnight. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.FRIDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves subsiding to 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. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest. A chance of
showers. Waves calm to 2 feet.

$$

LSZ265-170400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 PM EDT Wed Aug 16 2017

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Patchy fog.
Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...East winds 15 to 25 knots. Scattered showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...East winds 20 to 30 knots diminishing to 15 to
25 knots late. Showers and scattered thunderstorms. Waves
building to 5 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots becoming north 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
A slight chance of thunderstorms through midnight. Showers
likely. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots veering west. Waves calm
to 2 feet.
.MONDAY...West winds 10 to 20 knots backing southwest. A chance
of showers. A chance of thunderstorms. Waves calm to 2 feet.

$$

LSZ266-170400-
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-
347 PM EDT Wed Aug 16 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots
late. Scattered showers after midnight. Waves building to 2 to
4 feet.
.THURSDAY...Southeast winds 20 to 30 knots backing east in the
afternoon. A few gale force gusts to 35 knots possible in the
afternoon. Showers and a slight chance of thunderstorms. Waves
building to 5 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then backing north late. A slight chance
of thunderstorms through midnight. Showers likely. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots veering west. Waves calm to
2 feet.
.MONDAY...Southwest winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms. Waves calm to 2 feet.

$$

LSZ267-170400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 PM EDT Wed Aug 16 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
Scattered showers after midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 20 to 30 knots. A few gale force gusts
to 35 knots possible in the afternoon. Showers and isolated
thunderstorms. Waves building to 4 to 7 feet occasionally to 9
feet.
.THURSDAY NIGHT...East winds 20 to 30 knots diminishing to 10 to
20 knots. A slight chance of thunderstorms through midnight.
Showers. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers. Waves subsiding
to 1 to 3 feet, then building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest. Waves
calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms. Waves calm to 2 feet.

$$

LSZ261-170400-
MAFOR 1621/
Superior West 12130 11230 11236 13146 11130. Patchy fog
overnight. Scattered showers after midnight tonight. Scattered
thunderstorms early in the afternoon. Scattered showers and
thunderstorms late Thursday. Waves 2 to 4 feet building to 3 to 6
feet tonight. Waves 4 to 7 feet Thursday.

Superior North Central 14220 12236 11246 11240. Patchy fog this
evening. Scattered showers late Thursday. Waves 1 to 3 feet
tonight. Waves 3 to 6 feet building to 5 to 8 feet Thursday.

Superior South Central 13220 11320 11236 11336 11330 11240.
Patchy fog through early evening. Scattered showers late tonight.
Scattered showers and thunderstorms Thursday afternoon. Waves 1
to 3 feet tonight. Waves 3 to 6 feet Thursday.

Superior East 12210 11220 11320 11330 12346 19256 11246. Waves 1
to 3 feet tonight. Waves 3 to 6 feet building to 5 to 8 feet
Thursday.

$$

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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