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 270144
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
944 PM EDT Sat May 26 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 trough of low pressure averaging 29.7 inches will
hold across the Great Lakes through the Memorial Day weekend. The
trough will shift to the lower Great Lakes and weaken to 29.9
inches on Memorial Day. High pressure of 30.1 inches will then
push across northern Ontario and the upper Great Lakes by Monday
evening before drifting over Quebec on Tuesday. A 29.4 inch low
just to the south of Lake Winnipeg will track east into
northwestern Ontario by early Wednesday morning before weakening
to 29.5 inches on Thursday morning near western Lake Superior. The
low will weaken further to 29.6 inches as it tracks southeast
across the upper Great Lakes through Thursday evening.

LSZ162-270945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
944 PM EDT Sat May 26 2018 /844 PM CDT Sat May 26 2018/

.REST OF TONIGHT...North winds less than 10 knots backing west
after midnight, then backing southwest late. Patchy fog. Waves
calm to 2 feet.
.SUNDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then becoming south less than 10 knots
late. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots becoming northeast
5 to 15 knots after midnight. A chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. A
chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northeast. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-270945-
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-
944 PM EDT Sat May 26 2018

.REST OF TONIGHT...Northeast winds less than 10 knots backing
north after midnight, then backing west late. Areas of fog. Waves
calm to 2 feet.
.SUNDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then becoming south less than 10 knots
late. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds less than 10 knots increasing to
5 to 15 knots after midnight, then veering southwest late. A
slight chance of showers through midnight, then showers likely
and a slight chance of thunderstorms after midnight. Waves calm
to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...South winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northeast. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-270945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
944 PM EDT Sat May 26 2018

.REST OF TONIGHT...Northeast winds 5 to 15 knots backing west
late. A slight chance of showers and thunderstorms by late
evening. Areas of fog. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest late. Patchy
fog. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then becoming southwest 10 to 20 knots late. A chance
of showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming south 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-270945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
944 PM EDT Sat May 26 2018

.REST OF TONIGHT...East winds 5 to 15 knots becoming south less
than 10 knots after midnight, then becoming west 5 to 15 knots
late. Areas of fog. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering north in the
afternoon, then veering east late. Patchy fog. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south late.
A chance of showers and a slight chance of thunderstorms after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ266-270945-
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-
944 PM EDT Sat May 26 2018

.REST OF TONIGHT...Southeast winds 5 to 15 knots veering south
late. Areas of fog by late evening. Widespread fog after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest in the
afternoon, then backing west late. Patchy fog. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A slight chance of
rain showers after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering north by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet.

$$

LSZ267-270945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
944 PM EDT Sat May 26 2018

.REST OF TONIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering south late. Widespread
fog. A chance of thunderstorms and a slight chance of rain
showers. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering west in the
afternoon. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. A slight chance of rain showers after midnight. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing north by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 15 to 25 knots. Waves building
to 1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots becoming north 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$
LSZ261-270945-
MAFOR 2703/
Superior West 11800 11603 13500 12400 11300. Patchy fog late this
evening and Sunday. Patchy fog through early evening Sunday
evening. Waves 1 foot or less.

Superior North Central 11203 11103 11603 11600 12610 11600 11500.
Patchy fog from late morning on Sunday. Patchy fog through early
evening Sunday evening. Waves 1 foot or less.

Superior South Central 11303 11403 11503 11600 11700 11100 12300.
Patchy fog from late this evening through late morning on Sunday.
Patchy fog early evening Sunday evening. Waves 2 feet or less.

Superior East 12313 11403 11400 11500 13600. Chance of showers
and thunderstorms overnight. Patchy fog from late morning on
Sunday. 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.