Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Text Only | 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 170157
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
957 PM EDT Sun Jul 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 will remain over the
Upper Great Lakes through Monday. Once this high shifts
southeast, a 29.8 inch trough will cross Lake Superior Tuesday
into Wednesday. The trough will settle south of Lake Superior on
Thursday as a 30.0 inch ridge builds over the Upper Great Lakes.
On Friday another trough at 29.8 inches will track across the
Upper Great Lakes as the ridge moves over the Ohio Valley.

LSZ162-171000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
957 PM EDT Sun Jul 16 2017 /857 PM CDT Sun Jul 16 2017/

.REST OF TONIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Variable winds 10 knots or less becoming east winds 5
to 15 knots late. A slight chance of showers by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots. A chance of showers
through midnight then showers likely. A chance of thunderstorms.
Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering west. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.

$$

LSZ263-171000-
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-
957 PM EDT Sun Jul 16 2017

.REST OF TONIGHT...East winds 5 to 15 knots becoming southeast
less than 10 knots after midnight, then becoming south 5 to
15 knots late. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast late. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A slight chance of showers through midnight, then
showers likely. A chance of thunderstorms. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Showers likely through
early afternoon, then a slight chance of showers. A slight chance
of thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds less than 10 knots becoming southwest
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds less than 10 knots becoming
southwest 5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.

$$

LSZ264-171000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
957 PM EDT Sun Jul 16 2017

.REST OF TONIGHT...Northwest winds less than 10 knots backing
south after midnight, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast late. Waves
calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest late.
A slight chance of showers through midnight, then showers likely.
A chance of thunderstorms. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Showers likely through
early afternoon, then a slight chance of showers. A slight chance
of thunderstorms. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds less than 10 knots becoming southwest
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-171000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
957 PM EDT Sun Jul 16 2017

.REST OF TONIGHT...North winds less than 10 knots becoming
southeast 5 to 15 knots after midnight, then veering south late.
Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms after midnight. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. A chance of
showers and thunderstorms through midnight, then a chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves calm
to 2 feet.
.FRIDAY...East winds 10 to 20 knots veering south. Waves calm to
2 feet.

$$

LSZ266-171000-
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-
957 PM EDT Sun Jul 16 2017

.REST OF TONIGHT...North winds 5 to 15 knots becoming south less
than 10 knots late. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A chance of showers and a slight chance of thunderstorms after
midnight. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TUESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A chance of showers and thunderstorms.
Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming northwest 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ267-171000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
957 PM EDT Sun Jul 16 2017

.REST OF TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming southeast less than
10 knots late. Waves calm to 2 feet.
.MONDAY...South winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers, then a
chance of showers and thunderstorms by mid afternoon. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$
LSZ261-171000-
MAFOR 1703/
Superior West 12200 15300. Chance of showers Monday evening.
Waves 1 foot or less.

Superior North Central 11500 13400 13310 11320. Waves 2 feet or
less.

Superior South Central 11100 11300 12400 11300 12310 11320. Waves
2 feet or less overnight and Monday. Waves 1 to 3 feet Monday
evening.

Superior East 11810 11100 11300 11500 11400 11300 12310. Waves 2
feet or less.

$$

RJT

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.