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 30
000
FZUS63 KMQT 231340
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
940 AM EDT Wed Aug 23 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...An enhanced pressure gradient continues to linger
across Lake Superior today as a 29.3 inch low lifts across Quebec
and a high pressure ridge of 30.1 inches slowly pushes east
towards the Upper Great Lakes region. This 30.1 inch surface ridge
will move over the Upper Great Lakes tonight and persist across
the area into early next week.

LSZ162-232145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
940 AM EDT Wed Aug 23 2017 /840 AM CDT Wed Aug 23 2017/

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then backing west late. Waves
1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-232145-
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-
940 AM EDT Wed Aug 23 2017

.REST OF TODAY...Northwest winds 10 to 20 knots becoming west
5 to 15 knots late. Waves 2 to 4 feet subsiding to calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight.
Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northeast less
than 10 knots in the afternoon, then increasing to 5 to 15 knots
late. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots becoming southeast
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-232145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
940 AM EDT Wed Aug 23 2017

.REST OF TODAY...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves 3 to 6 feet occasionally to 8 feet
subsiding to 2 to 4 feet.
.TONIGHT...North winds 5 to 15 knots backing northwest late.
Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then backing west late. Waves calm to
2 feet.
.THURSDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY...West winds less than 10 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ265-232145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
940 AM EDT Wed Aug 23 2017

.REST OF TODAY...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots late. Waves 4 to 7 feet occasionally to 9 feet
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds less than 10 knots becoming
west 5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-232145-
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-
940 AM EDT Wed Aug 23 2017

.REST OF TODAY...Northwest winds 20 to 30 knots. Waves 4 to 8
feet occasionally to 10 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing northwest late. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Northwest winds less than 10 knots backing west by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ267-232145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
940 AM EDT Wed Aug 23 2017

.REST OF TODAY...Northwest winds 20 to 30 knots. Waves 4 to 8
feet occasionally to 10 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest late.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots becoming south less
than 10 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.

$$
LSZ261-232145-
MAFOR 2315/
Superior West 11720 13610 11810 11800 12100. Waves 3 feet or less.

Superior North Central 12730 11720 11710 11810 12700 11800. Waves
3 to 6 feet this afternoon subsiding to 1 to 2 feet tonight and
Thursday morning.

Superior South Central 12740 11730 12720 11810 12800. Waves 4 to
7 feet this afternoon subsiding to 3 feet or less tonight and
Thursday morning.

Superior East 13740 11830 11820 13810. Waves 5 to 8 feet this
afternoon subsiding to 1 to 3 feet tonight and Thursday morning.

$$

Kluber

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.