Great Lakes Forecast
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FZUS63 KMQT 161353
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
953 AM 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...High pressure of 30.2 inches over the Upper Great
Lakes will reach the Lower Great Lakes late this afternoon. 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.

LSZ162-162200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
953 AM EDT Wed Aug 16 2017 /853 AM CDT Wed Aug 16 2017/

.REST OF TODAY...East winds 10 to 20 knots increasing to 15 to
25 knots late. A chance of showers. Waves 1 to 3 feet building to
3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots backing northeast late. A
chance of showers through midnight, then showers and a slight
chance of thunderstorms after midnight. Waves 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. 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...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-162200-
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-
953 AM EDT Wed Aug 16 2017

.REST OF TODAY...East winds 5 to 15 knots. A slight chance of
showers by mid afternoon. Waves calm to 2 feet building to 1 to
3 feet.
.TONIGHT...East winds 10 to 20 knots. A chance of showers through
midnight, then showers after midnight. Waves building to 2 to
4 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing northeast late. Showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves building to 5 to
8 feet occasionally to 10 feet, then 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. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ264-162200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
953 AM EDT Wed Aug 16 2017

.REST OF TODAY...Southeast winds 5 to 15 knots backing east late.
A slight chance of showers by mid afternoon. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A chance of showers. Waves building to 2 to
4 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves building to 5 to
8 feet occasionally to 10 feet, then 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. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet.

$$

LSZ265-162200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
953 AM EDT Wed Aug 16 2017

.REST OF TODAY...Southeast winds 10 to 20 knots backing east in
the afternoon. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight, then becoming east 15 to 25 knots late. A chance of
showers. Waves building to 2 to 4 feet.
.THURSDAY...East winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Showers. A slight chance of thunderstorms by mid afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing north after
midnight. Showers likely. Waves building to 5 to 8 feet
occasionally to 10 feet, then 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 through early
afternoon. 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 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-162200-
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-
953 AM EDT Wed Aug 16 2017

.REST OF TODAY...Southeast winds 5 to 15 knots backing east in
the afternoon, then increasing to 10 to 20 knots late. Waves calm
to 2 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight, then increasing to 15 to 25 knots late. A chance of
showers. Waves building to 2 to 4 feet.
.THURSDAY...East winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots becoming northeast
10 to 20 knots after midnight. 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 calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ267-162200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
953 AM EDT Wed Aug 16 2017

.REST OF TODAY...Southeast winds 10 to 20 knots becoming east
5 to 15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 15 to
25 knots after midnight. A slight chance of showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 20 to 30 knots. A chance of showers
through early afternoon, then showers by mid afternoon. 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 after midnight. 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. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$
LSZ261-162200-
MAFOR 1615/
Superior West 11210 12220 11230 11236 12226 11136. Chance of
showers this evening. Waves 2 to 5 feet.

Superior North Central 12310 12210 11220 11320 11230 11226.
Chance of showers late tonight through mid morning Thursday.
Waves 1 to 5 feet.

Superior South Central 11310 11210 12220 11310 12320 11236. Waves
calm to 4 feet.

Superior East 13200 11210 13320 11330. Chance of showers Thursday
morning. Waves 1 to 5 feet.

$$

Petro

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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