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National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 190207
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1007 PM EDT Tue Sep 18 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 30.1 inch ridge will remain centered over the lower
Hudson Bay and Upper Great Lakes through Thursday morning as a
29.5 inch low begins to lift northeastward from Minnesota to the
Upper Great Lakes. The low will track across Lake Superior
Thursday night and then continue eastward into northern Ontario
Friday morning while deepening further to 29.3 inches. A 30.4 inch
ridge returns to the Upper Great Lakes for late Friday and
Saturday. Another low of about 29.8 inches will impact the region
on Sunday and into Monday.

LSZ162-191015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1007 PM EDT Tue Sep 18 2018 /907 PM CDT Tue Sep 18 2018/

REST OF TONIGHT
East winds 5 to 15 knots. Waves calm to
2 feet.

WEDNESDAY
East winds 5 to 15 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.

WEDNESDAY NIGHT
Northeast winds 5 to 15 knots increasing to
10 to 20 knots late. A chance of showers. Waves building to 2 to
4 feet.

THURSDAY
Northeast winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. Showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.

THURSDAY NIGHT
Northeast gales to 35 knots becoming north
15 to 25 knots after midnight. Showers. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.

FRIDAY
North winds 20 to 30 knots. A chance of showers. Waves
subsiding to 2 to 4 feet.

FRIDAY NIGHT
Northwest winds 5 to 15 knots backing west after
midnight. Waves subsiding to calm to 2 feet.

SATURDAY
Southwest winds 10 to 20 knots. Waves building to
2 to 4 feet.

SUNDAY
Northeast winds 10 to 20 knots veering east. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.



LSZ263-191015-
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-
1007 PM EDT Tue Sep 18 2018

REST OF TONIGHT
East winds 5 to 15 knots. Waves calm to
2 feet.

WEDNESDAY
East winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.

WEDNESDAY NIGHT
East winds 5 to 15 knots becoming northeast
10 to 20 knots late. A chance of showers. Waves building to 2 to
4 feet.

THURSDAY
East winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. A chance of showers through early
afternoon, then showers and a slight chance of thunderstorms by
mid afternoon. Some thunderstorms may produce heavy rainfall by
mid afternoon. Waves building to 6 to 9 feet occasionally to
11 feet.

THURSDAY NIGHT
Northeast gales to 35 knots becoming north
20 to 30 knots after midnight. Showers. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

FRIDAY
North gales to 35 knots. Showers likely through early
afternoon. Waves subsiding to 4 to 8 feet occasionally to
10 feet.

FRIDAY NIGHT
North winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.

SATURDAY
Southwest winds 10 to 20 knots. Waves building to
3 to 5 feet occasionally to 7 feet.

SUNDAY
Northeast winds 10 to 20 knots becoming east 5 to
15 knots. A chance of showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 6 feet occasionally to 8 feet.



LSZ264-191015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1007 PM EDT Tue Sep 18 2018

REST OF TONIGHT
North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight, then becoming east 5 to 15 knots
late. Waves calm to 2 feet.

WEDNESDAY
East winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
East winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then backing northeast late. A slight
chance of showers. Waves calm to 2 feet.

THURSDAY
East winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of showers through early
afternoon, then showers and a slight chance of thunderstorms by
mid afternoon. Some thunderstorms may produce heavy rainfall by
mid afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.

THURSDAY NIGHT
East gales to 35 knots becoming northeast 20 to
30 knots after midnight. Showers through midnight, then showers
likely after midnight. Waves building to 5 to 9 feet occasionally
to 11 feet.

FRIDAY
North gales to 35 knots. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
5 to 9 feet occasionally to 11 feet.

FRIDAY NIGHT
North winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet.

SATURDAY
Southwest winds 10 to 20 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.

SUNDAY
Northeast winds 15 to 25 knots veering east. A chance
of showers. Waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet.



LSZ265-191015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1007 PM EDT Tue Sep 18 2018

REST OF TONIGHT
North winds 10 to 20 knots veering northeast
after midnight, then becoming east 5 to 15 knots late. Waves calm
to 2 feet.

WEDNESDAY
East winds 5 to 15 knots. A chance of showers by mid
afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
East winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.

THURSDAY
East winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Showers. A chance of thunderstorms by
mid afternoon. Some thunderstorms may produce heavy rainfall by
mid afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.

THURSDAY NIGHT
East winds 20 to 30 knots becoming north 10 to
20 knots after midnight. Showers and a chance of thunderstorms
through midnight, then showers likely after midnight. Some
thunderstorms may produce heavy rainfall through midnight. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.

FRIDAY
Northwest gales to 35 knots veering north by mid
afternoon. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet.

FRIDAY NIGHT
North winds 15 to 25 knots becoming west 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.

SATURDAY
South winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

SUNDAY
North winds 15 to 25 knots becoming east 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet.



LSZ266-191015-
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-
1007 PM EDT Tue Sep 18 2018

REST OF TONIGHT
North winds 10 to 20 knots veering northeast
after midnight, then becoming east 5 to 15 knots late. Waves calm
to 2 feet.

WEDNESDAY
East winds 5 to 15 knots. A chance of showers by mid
afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
East winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.

THURSDAY
East winds 10 to 20 knots increasing to 20 to
30 knots by mid afternoon. Showers. A chance of thunderstorms by
mid afternoon. Some thunderstorms may produce heavy rainfall by
mid afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.

THURSDAY NIGHT
East gales to 35 knots becoming southwest 15 to
25 knots after midnight. Showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Some thunderstorms
may produce heavy rainfall. Waves building to 4 to 8 feet
occasionally to 10 feet.

FRIDAY
Northwest gales to 35 knots veering north by mid
afternoon. A chance of showers. Waves building to 6 to 9 feet
occasionally to 11 feet.

FRIDAY NIGHT
North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.

SATURDAY
South winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.

SUNDAY
North winds 15 to 25 knots veering east. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.



LSZ267-191015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1007 PM EDT Tue Sep 18 2018

REST OF TONIGHT
North winds 10 to 20 knots veering east late.
Waves 1 to 3 feet subsiding to calm to 2 feet.

WEDNESDAY
East winds 5 to 15 knots. A chance of showers by mid
afternoon. Waves calm to 2 feet.

WEDNESDAY NIGHT
East winds 10 to 20 knots. A chance of
showers. Waves building to 1 to 3 feet.

THURSDAY
East winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Showers. A chance of thunderstorms by
mid afternoon. Some thunderstorms may produce heavy rainfall by
mid afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.

THURSDAY NIGHT
Southeast gales to 35 knots becoming south
20 to 30 knots after midnight. Showers and a chance of
thunderstorms. Some thunderstorms may produce heavy rainfall.
Waves 3 to 6 feet occasionally to 8 feet.

FRIDAY
West winds 20 to 30 knots becoming northwest gales to
35 knots by mid afternoon. Waves subsiding to 2 to 4 feet, then
building to 5 to 8 feet occasionally to 10 feet.

FRIDAY NIGHT
North winds 15 to 25 knots becoming northeast
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.

SATURDAY
South winds 10 to 20 knots increasing to 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.

SUNDAY
West winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves subsiding to 2 to 4 feet.


LSZ261-191015-
MAFOR 1903/
Superior West 14210 11210 12220 11110. A chance of showers
Wednesday afternoon and Wednesday evening. Waves 1 to 3 feet.

Superior North Central 11800 11100 12200 13210 11200. Waves 1 to
2 feet.

Superior South Central 11810 11100 13200 12210 11200. A chance of
showers Wednesday evening. Waves 1 to 2 feet.

Superior East 12110 11210 11200 11210 11200 11210 11200. A chance
of showers Wednesday evening. Waves 2 feet or less.



JSS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes