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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FZUS63 KMQT 220806
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
406 AM EDT Tue Aug 22 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 29.7 inches over eastern Lake Superior
will move to northern Quebec today. 30.2 inch high pressure
extending from Manitoba to Nebraska tonight will move over
Wisconsin Thursday morning and remain over the Great Lakes through
Friday and into Saturday.

LSZ162-221615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
406 AM EDT Tue Aug 22 2017 /306 AM CDT Tue Aug 22 2017/

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Isolated showers by mid afternoon. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north late.
Waves 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-221615-
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-
406 AM EDT Tue Aug 22 2017

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Isolated
showers. Waves calm to 2 feet.
.TODAY...Northwest winds 15 to 25 knots backing west in the
afternoon. Isolated showers by mid afternoon. Waves building to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight, then diminishing to 10 to 20 knots late. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest in the
afternoon, then becoming west 5 to 15 knots late. Waves subsiding
to calm to 2 feet.
.WEDNESDAY NIGHT...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 by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-221615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
406 AM EDT Tue Aug 22 2017

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Scattered
showers. Waves calm to 2 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Isolated showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight. Isolated showers through midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northwest less
than 10 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds less than 10 knots backing southeast. Waves
calm to 2 feet.
.SATURDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-221615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
406 AM EDT Tue Aug 22 2017

.EARLY THIS MORNING...North winds 10 to 20 knots. Scattered
showers. Waves calm to 2 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west winds 20 to
30 knots with a few gale force gusts to 35 knots in the
afternoon. Isolated showers through early afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-221615-
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-
406 AM EDT Tue Aug 22 2017

.EARLY THIS MORNING...North winds 10 to 20 knots. Scattered
showers and isolated thunderstorms. Waves calm to 2 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west winds 20 to
30 knots in the afternoon with a few gale force gusts to 35 knots.
Isolated showers through early afternoon. Waves building to 4 to
7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-221615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
406 AM EDT Tue Aug 22 2017

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Scattered
showers and isolated thunderstorms. Waves calm to 2 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west winds 20 to
30 knots in the afternoon with a few gale force gusts to 35 knots.
Scattered showers. Waves building to 5 to 8 feet occasionally to
10 feet.
.TONIGHT...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots diminishing to 20 to 30 knots after midnight.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. 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...Northwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-221615-
MAFOR 2209/
Superior West 12730 13630 12730 11820. Waves 1 to 3 feet building
to 2 to 4 feet today. Waves 2 to 4 feet tonight.

Superior North Central 11710 11730 11740 11640 11630 11730 11740
11730. Scattered showers this morning. Waves 1 foot or less
building to 3 to 5 feet today. Waves 3 to 6 feet tonight.

Superior South Central 11810 11730 11740 12640 12740 11730.
Scattered showers through mid morning. Waves 1 to 2 feet building
to 3 to 5 feet today. Waves 3 to 6 feet tonight.

Superior East 11110 11730 11740 12640 11740 12730. Scattered
showers this morning. Waves 1 to 3 feet building to 5 to 7 feet
today. Waves 5 to 8 feet tonight.

$$

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.