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Marine Observations for Lake Superior
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Nearshore Forecast


000
FZUS53 KDLH 052109
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
309 PM CST Sun Feb 5 2023

For waters within 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.

LSZ140-141-060515-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
309 PM CST Sun Feb 5 2023

.TONIGHT...Northwest wind 5 to 10 knots becoming west late in the
night. Partly cloudy. Waves 1 to 2 feet.
.MONDAY...South wind 10 to 15 knots. Gusts up to 20 knots. Mostly
cloudy. Waves 1 to 3 feet building to 2 to 4 feet in the late
morning and early afternoon, then subsiding to 1 to 3 feet late
in the afternoon.
.MONDAY NIGHT...South wind 15 to 20 knots with gusts to around
25 knots becoming southwest with gusts to around 25 knots after
midnight. Snow in the evening, then chance of snow and slight
chance of rain after midnight. Waves 3 to 5 feet. Waves
occasionally to 7 feet. A small craft advisory may be needed.
.TUESDAY...West wind 20 to 25 knots with gusts to around 30 knots
easing to 10 to 15 knots with gusts to around 25 knots late in
the afternoon. Partly sunny. Waves 2 to 4 feet subsiding to 1 to
3 feet late in the afternoon. A small craft advisory may be
needed.

Note...Wave height forecasts are for ice free areas.

$$

LSZ142-143-060515-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
309 PM CST Sun Feb 5 2023

.TONIGHT...West wind 5 to 10 knots becoming southwest late in the
night. Partly cloudy. Waves 1 foot or less.
.MONDAY...Southwest wind 5 to 10 knots becoming east 10 to
15 knots late in the afternoon. Slight chance of snow in the
afternoon. Waves 1 foot or less.
.MONDAY NIGHT...Southeast wind 5 to 10 knots becoming south 10 to
15 knots with gusts to around 20 knots late in the evening, then
becoming west 15 to 20 knots with gusts to around 25 knots after
midnight. Snow likely in the evening. Slight chance of rain
through the night. Chance of snow after midnight. Waves 1 to
2 feet.
.TUESDAY...West wind 20 to 25 knots. Gusts up to 30 knots
decreasing to 25 knots in the afternoon. Partly sunny. Waves 2 to
4 feet subsiding to 1 to 2 feet late in the afternoon. A small
craft advisory may be needed.

Note...Wave height forecasts are for ice free areas.

$$

LSZ144-145-060515-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
309 PM CST Sun Feb 5 2023

.TONIGHT...West wind 5 to 10 knots becoming southwest after
midnight. Partly cloudy. Waves 1 foot or less.
.MONDAY...South wind 10 to 15 knots becoming southeast with gusts
to around 20 knots in the afternoon. Slight chance of snow in the
afternoon. Waves 1 foot or less.
.MONDAY NIGHT...Southeast wind 10 to 15 knots with gusts to
around 20 knots becoming west 15 to 20 knots with gusts to around
25 knots early in the morning. Snow in the evening. Slight chance
of rain through the night. Slight chance of snow after midnight.
Waves 1 to 3 feet.
.TUESDAY...West wind 20 to 25 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and early afternoon,
then decreasing to 25 knots late in the afternoon. Partly sunny.
Waves 1 to 3 feet. A small craft advisory may be needed.

Note...Wave height forecasts are for ice free areas.

$$

LSZ146-060515-
Port Wing to Sand Island WI-
309 PM CST Sun Feb 5 2023

.TONIGHT...West wind 5 to 10 knots becoming southwest after
midnight. Partly cloudy. Waves 1 foot or less.
.MONDAY...South wind 10 to 15 knots becoming southeast with gusts
to around 20 knots in the afternoon. Mostly cloudy. Waves 1 foot
or less.
.MONDAY NIGHT...South wind 10 to 15 knots with gusts to around
20 knots becoming southwest 15 to 20 knots with gusts to around
25 knots after midnight. Snow in the evening. Slight chance of
rain through the night. Chance of snow after midnight. Waves 1 to
2 feet building to 1 to 3 feet early in the morning.
.TUESDAY...West wind 20 to 25 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and early afternoon,
then decreasing to 25 knots late in the afternoon. Partly sunny.
Waves 2 to 4 feet. A small craft advisory may be needed.

Note...Wave height forecasts are for ice free areas.

$$

LSZ147-060515-
Sand Island to Bayfield WI-
309 PM CST Sun Feb 5 2023

.TONIGHT...Southwest wind 5 knots becoming south late in the
night. Partly cloudy. Waves 1 foot or less.
.MONDAY...South wind 10 to 15 knots. Gusts up to 20 knots in the
afternoon. Mostly cloudy. Waves 1 foot or less.
.MONDAY NIGHT...South wind 10 to 15 knots with gusts to around
20 knots becoming southwest after midnight, then becoming west
with gusts to around 20 knots early in the morning. Chance of
snow through the night. Slight chance of rain after midnight.
Waves 1 to 2 feet building to 2 to 4 feet early in the morning.
.TUESDAY...West wind 20 to 25 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and early afternoon,
then decreasing to 25 knots late in the afternoon. Partly sunny.
Waves 2 to 4 feet. A small craft advisory may be needed.

Note...Wave height forecasts are for ice free areas.

$$

LSZ150-060515-
Outer Apostle Islands Beyond 5 NM from Mainland-
309 PM CST Sun Feb 5 2023

.TONIGHT...Southwest wind 5 to 10 knots. Partly cloudy. Waves
1 foot or less.
.MONDAY...South wind 10 to 15 knots becoming southeast with gusts
to around 20 knots late in the afternoon. Partly sunny. Waves
1 to 2 feet.
.MONDAY NIGHT...South wind 10 to 15 knots with gusts to around
20 knots becoming southwest with gusts to around 25 knots after
midnight. Chance of snow and slight chance of rain through the
night. Waves 1 to 3 feet building to 2 to 4 feet early in the
morning. A small craft advisory may be needed.
.TUESDAY...West wind 20 to 25 knots. Gusts up to 30 knots
increasing to 35 knots late in the morning, then decreasing to
30 knots early in the afternoon decreasing to 25 knots late in
the afternoon. Partly sunny. Waves 4 to 6 feet. Waves
occasionally to 7 feet. A gale warning may be needed.

Note...Wave height forecasts are for ice free areas.

$$

LSZ148-060515-
Oak Point to Saxon Harbor WI-
309 PM CST Sun Feb 5 2023

.TONIGHT...Southwest wind 5 to 10 knots becoming south late in
the night. Partly cloudy. Waves 1 foot or less.
.MONDAY...South wind 15 to 20 knots. Gusts up to 25 knots. Partly
sunny. Waves 1 to 2 feet.
.MONDAY NIGHT...South wind 15 to 20 knots with gusts to around
25 knots becoming southwest 10 to 15 knots with gusts to around
20 knots after midnight. Slight chance of rain in the evening.
Chance of snow through the night. Waves 1 foot or less.
.TUESDAY...West wind 5 to 15 knots with gusts to around 20 knots
rising to 15 to 20 knots with gusts to around 25 knots in the
late morning and afternoon. Partly sunny. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

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

NLY

Duluth, MichiganLSZ140 Grand Portage to Grank Marais MN LSZ141 Grand Marais to Taconite Harbor MN LSZ142 Taconite Harbor to Silver Bay Harbor MN LSZ143 Silver Bay Harbor to Two Harbors MN LSZ144 Two Harbors to Duluth MN LSZ145 Duluth MN to Port Wing WI LSZ146 Port Wing to Sand Island WI LSZ147 Sand Island to Bayfield WI LSZ148 Oak Point to Saxon Harbor WI LSZ121 Chequamegon Bay - Bayfield to Oak Point WI LSZ140 Grand Portage to Grank Marais MN LSZ141 Grand Marais to Taconite Harbor MN LSZ142 Taconite Harbor to Silver Bay Harbor MN LSZ143 Silver Bay Harbor to Two Harbors MN LSZ144 Two Harbors to Duluth MN LSZ145 Duluth MN to Port Wing WI LSZ146 Port Wing to Sand Island WI LSZ147 Sand Island to Bayfield WI LSZ148 Oak Point to Saxon Harbor WI LSZ121 Chequamegon Bay - Bayfield to Oak Point WI

Open Waters Forecast


000
FZUS63 KMQT 052120
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
420 PM EST Sun Feb 5 2023

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 weakening 29.8 inch trough exits the region overnight.
In its wake, ridging builds to 30.2 inches across the Great Lakes
region tonight then to 30.5 inches by Monday evening over Quebec.
A 29.3 inch low pressure tracks east toward Hudson Bay on Monday
and deepens to 29.1 inches over southern Hudson Bay by Tuesday
afternoon. This low pressure drags a 29.6 inch trough across Lake
Superior Tuesday morning with 30.2 ridging building over the
Lower Great Lakes by Wednesday morning. On Thursday, a deepening
low pressure lifts northeast toward Lower Michigan at 29.4
inches. This low pressure shifts east on Friday as 30.3 inch
ridging builds east into the Great Lakes region.

LSZ162-060530-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
420 PM EST Sun Feb 5 2023 /320 PM CST Sun Feb 5 2023/

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest by
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A slight chance of snow showers in the
afternoon. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots by midnight, then veering west late. Snow showers
in the evening. A slight chance of rain showers. A slight chance
of snow showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots backing northeast
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-060530-
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-
420 PM EST Sun Feb 5 2023

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Flurries.
Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest by
midnight. Flurries in the evening. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then veering southwest late. A chance of
snow showers in the evening. A slight chance of rain showers.
Snow showers after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots. A slight chance of snow
showers in the morning. Waves building to 4 to 8 feet
occasionally to 10 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots backing northeast
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-060530-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
420 PM EST Sun Feb 5 2023

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Isolated
snow showers. Waves 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing southwest late.
Flurries in the evening. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. Waves building to 6 to 9 feet occasionally to
11 feet.
.MONDAY NIGHT...South winds to 30 knots with a few gale force
gusts to 35 knots possible becoming southwest 15 to 25 knots
late. Snow showers, possibly mixed with rain. Waves building to
10 to 14 feet occasionally to 18 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.TUESDAY...West winds to 30 knots with a few gale force
gusts to 35 knots possible. A chance of snow showers,
possibly mixed with rain in the morning. Waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots backing east after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ265-060530-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
420 PM EST Sun Feb 5 2023

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Isolated
snow showers. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by midnight, then backing southwest late. Flurries in
the evening. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots increasing to 20 to 30 knots
by mid afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY NIGHT...South winds to 30 knots with a few gale force
gusts to 35 knots possible becoming southwest 15 to 25 knots
late. A chance of snow showers, possibly mixed with rain. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 20 to 30 knots increasing to 35 knots
gales in the afternoon. A chance of snow showers in the morning.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots backing south in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots backing east
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots. Freezing spray. Waves subsiding to 1 to 3 feet.

$$

LSZ266-060530-
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-
420 PM EST Sun Feb 5 2023

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Isolated snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots becoming northwest 5 to
15 knots by midnight, then backing southwest late. Isolated snow
showers in the evening. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.MONDAY NIGHT...South gales to 40 knots diminishing to 20 to
30 knots late. A chance of snow showers in the evening, then snow
showers, possibly mixed with rain after midnight. Waves building
to 10 to 14 feet occasionally to 18 feet, then subsiding to 5 to
8 feet occasionally to 10 feet.
.TUESDAY...West gales to 35 knots. A chance of snow showers,
possibly mixed with rain in the morning. Waves subsiding to 4 to
7 feet occasionally to 9 feet, then building to 8 to 11 feet
occasionally to 14 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots backing southwest
after midnight. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots backing east after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 2 to 4 feet.

$$

LSZ267-060530-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
420 PM EST Sun Feb 5 2023

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Isolated
snow showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. Isolated snow showers in the evening. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to calm to
2 feet.
.MONDAY...South winds 10 to 20 knots increasing to 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...South gales to 35 knots diminishing to 20 to
30 knots late. A slight chance of snow showers in the evening,
then snow showers, possibly mixed with rain after midnight. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots increasing to gales to
40 knots in the afternoon. Rain and snow showers likely in the
morning. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 9 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots becoming
southwest 10 to 20 knots after midnight. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots backing south in the
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots backing east after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 1 to 3 feet.

$$

LSZ261-060530-
MAFOR 0522/
Superior West 12600 12510 13410 11310. Waves 2 feet or less.

Superior North Central 11720 11710 11610 11510 11420 13430. Waves
1 to 3 feet tonight building to 4 to 7 feet Monday.

Superior South Central 12720 11710 11600 11420 11430 11431 11440.
Waves 1 to 4 feet tonight building to 4 to 7 feet Monday.

Superior East 12830 11820 11700 11510 13430. Waves 3 to 5 feet
subsiding to 1 to 2 feet tonight then building to 3 to 6 feet
Monday.


$$

EK

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

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