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 180127
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
927 PM EDT Thu May 17 2018

For waters beyond 5 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 strengthening high pressure system of 30.2 inches
over Ontario will reach Southern Quebec on Friday at 30.4 inches.
A low pressure trough averaging 29.9 inches will track across Lake
Superior Saturday, followed by a high pressure system of 30.2
inches Sunday that will weaken to 30.1 inches Monday and Tuesday.

LSZ162-180930-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
927 PM EDT Thu May 17 2018 /827 PM CDT Thu May 17 2018/

.REST OF TONIGHT...Northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. Waves 3 to 6 feet occasionally to
8 feet subsiding to 2 to 4 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots veering south after
midnight. A slight chance of rain showers after midnight. Waves
subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
.SUNDAY...North winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots veering west
after midnight. Waves calm to 2 feet.
.MONDAY...East winds less than 10 knots veering west. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-180930-
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-
927 PM EDT Thu May 17 2018

.REST OF TONIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves 3 to 6 feet occasionally to 8 feet subsiding
to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves subsiding to calm to 2 feet, then building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. Waves
subsiding to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots diminishing to less than
10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming southwest
5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-180930-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
927 PM EDT Thu May 17 2018

.REST OF TONIGHT...Northeast winds 5 to 15 knots becoming east
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight, then diminishing to 10 to 20 knots late. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-180930-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
927 PM EDT Thu May 17 2018

.REST OF TONIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
5 to 15 knots. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ266-180930-
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-
927 PM EDT Thu May 17 2018

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
late. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-180930-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
927 PM EDT Thu May 17 2018

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering east
after midnight, then becoming southeast 10 to 20 knots late.
Waves calm to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$
LSZ261-180930-
MAFOR 1803/
Superior West 11230 12220 12210 12120 11210. Waves 2 to 5 feet.

Superior North Central 13210 12320 11330 11340 11330. Waves 1 to
5 feet.

Superior South Central 11210 11300 12310 12320 12330. Waves 1 to
4 feet.

Superior East 11110 11210 11310 13320 12330. Waves 1 to 4 feet.

$$

KEC

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.