Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
000
FZUS63 KMQT 130750
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 AM EDT Wed Sep 13 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 weak 29.7 inch trough over northern Ontario
will dissipate over Lake Superior today. A 30.2 inch ridge will
then build across northern Ontario through Friday as 29.5 inch low
pressure develops over the Plains. The trough will reach the
Upper Mississippi Valley on Saturday, then shift northeastward
across the Upper Great Lakes on Sunday as the ridge extends over
the Lower Great Lakes.

LSZ162-131600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 AM EDT Wed Sep 13 2017 /250 AM CDT Wed Sep 13 2017/

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then veering east late. Patchy fog. A slight chance of
showers. A slight chance of thunderstorms after midnight. Waves
building to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots late. A chance of showers and thunderstorms. Waves 1 to
3 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots becoming east
5 to 15 knots after midnight. Showers likely and a chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers. Waves subsiding to
1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest. A
chance of showers and thunderstorms. Waves subsiding to calm to
2 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ263-131600-
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-
350 AM EDT Wed Sep 13 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots becoming south less than
10 knots late. Waves calm to 2 feet.
.TONIGHT...East winds less than 10 knots becoming northeast 5 to
15 knots after midnight. A slight chance of showers and
thunderstorms after midnight. Waves building to 1 to 3 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Showers likely and a chance of thunderstorms.
Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves building to
2 to 4 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves subsiding to 1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of showers. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.

$$

LSZ264-131600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 AM EDT Wed Sep 13 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots becoming south less than
10 knots late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight. A slight chance of showers and thunderstorms after
midnight. Waves building to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Showers likely and a
chance of thunderstorms. Waves 1 to 3 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. A chance of showers and thunderstorms. Waves building
to 2 to 4 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers, then showers and thunderstorms
likely. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ265-131600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 AM EDT Wed Sep 13 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then backing east late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then veering southwest late. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 10 to 20 knots late. A slight
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots becoming east 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots. Showers likely and a
chance of thunderstorms. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of showers. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.

$$

LSZ266-131600-
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-
350 AM EDT Wed Sep 13 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing southeast late. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then diminishing to 5 to 15 knots late. A slight chance
of showers after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast in the
afternoon. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers and thunderstorms.
Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers, then
showers likely and a chance of thunderstorms. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-131600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 AM EDT Wed Sep 13 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing southeast late. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots. Patchy fog after midnight.
Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 1 to
3 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers through
early afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots veering northwest. A chance
of showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.

$$

LSZ261-131600-
MAFOR 1309/
Superior West 12510 11500 11400 11300 12200 11110. Waves 2 feet
or less.

Superior North Central 12510 11500 11400 12300 11200 11210. Waves
2 feet or less.

Superior South Central 13400 11300 11200 11310 11410 11400. Waves
2 feet or less.

Superior East 13410 11400 12300 12400. Waves 2 feet or less.

$$

JLB

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.