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Nearshore Forecast
520
FZUS53 KDLH 212255
NSHDLH
Nearshore Marine Forecast
National Weather Service Duluth MN
555 PM CDT Thu May 21 2026
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.
LSZ140-220400-
Grand Portage to Grand Marais MN-
555 PM CDT Thu May 21 2026
.TONIGHT...Northeast wind 5 to 10 knots. Mostly clear early in
the evening then becoming mostly cloudy. Waves 1 to 2 feet.
.FRIDAY...Northeast wind 15 to 20 knots with gusts to around
25 knots. Mostly sunny. Waves 1 to 2 feet building to 1 to 3 feet
late in the afternoon.
.FRIDAY NIGHT...East wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 20 knots. Chance of rain showers after midnight.
Waves 3 to 5 feet. A small craft advisory may be needed.
.SATURDAY...East wind 10 to 15 knots. Gusts up to 20 knots in the
morning. Rain showers. Waves 2 to 4 feet.
$$
LSZ141-220400-
Grand Marais to Taconite Harbor MN-
555 PM CDT Thu May 21 2026
.TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy then
becoming mostly cloudy in the late evening and early morning then
becoming partly cloudy. Waves 1 to 2 feet.
.FRIDAY...East wind 15 to 20 knots with gusts to around 25 knots.
Mostly sunny. Waves 1 to 3 feet building to 2 to 4 feet late in
the afternoon. A small craft advisory may be needed.
.FRIDAY NIGHT...East wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 20 knots after midnight. Rain showers likely after
midnight. Waves 3 to 5 feet. Waves occasionally to 7 feet. A
small craft advisory may be needed.
.SATURDAY...East wind 10 to 15 knots. Gusts up to 20 knots until
late afternoon. Rain showers. Waves 2 to 4 feet subsiding to 1 to
3 feet late in the afternoon.
$$
LSZ142-220400-
Taconite Harbor to Silver Bay Harbor MN-
555 PM CDT Thu May 21 2026
.TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy then
becoming mostly cloudy in the late evening and early morning then
becoming partly cloudy. Waves 1 to 2 feet.
.FRIDAY...Northeast wind 15 to 20 knots with gusts to around
25 knots. Mostly sunny. Waves 1 to 3 feet building to 2 to 4 feet
late in the afternoon. A small craft advisory may be needed.
.FRIDAY NIGHT...Northeast wind 15 to 20 knots with gusts to
around 25 knots becoming east 5 to 10 knots with gusts to around
20 knots early in the morning. Rain showers after midnight. Waves
3 to 5 feet. Waves occasionally to 7 feet. A small craft advisory
may be needed.
.SATURDAY...Northeast wind 5 to 10 knots. Gusts up to 20 knots in
the morning. Rain showers. Waves 2 to 4 feet subsiding to 1 to
3 feet in the afternoon.
$$
LSZ143-220400-
Silver Bay Harbor to Two Harbors MN-
555 PM CDT Thu May 21 2026
.TONIGHT...Northeast wind 10 to 15 knots with gusts to around
20 knots easing to 5 knots late in the night. Mostly cloudy until
early morning then becoming partly cloudy. Waves 1 to 3 feet.
.FRIDAY...Northeast wind 15 to 20 knots with gusts to around
25 knots. Mostly sunny. Waves 1 to 2 feet building to 2 to 4 feet
in the afternoon. A small craft advisory may be needed.
.FRIDAY NIGHT...Northeast wind 15 to 20 knots with gusts to
around 25 knots easing to 10 to 15 knots with gusts to around
20 knots after midnight. Chance of rain showers in the evening,
then rain showers after midnight. Waves 3 to 5 feet. Waves
occasionally to 7 feet. A small craft advisory may be needed.
.SATURDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots
early in the morning. Rain showers likely in the morning, then
chance of rain showers in the afternoon. Waves 1 to 3 feet.
$$
LSZ144-220400-
Two Harbors to Duluth MN-
555 PM CDT Thu May 21 2026
...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM CDT THIS EVENING...
.TONIGHT...Northeast wind 15 to 20 knots with gusts to around
25 knots easing to 5 to 10 knots after midnight. Mostly cloudy.
Waves 2 to 4 feet subsiding to 1 to 2 feet after midnight.
.FRIDAY...Northeast wind 15 to 20 knots with gusts to around
25 knots. Mostly sunny. Waves 1 to 2 feet building to 3 to 5 feet
in the afternoon. A small craft advisory may be needed.
.FRIDAY NIGHT...Northeast wind 20 to 25 knots with gusts to
around 30 knots easing to 10 to 15 knots with gusts to around
20 knots after midnight. Chance of rain showers in the evening,
then rain showers after midnight. Waves 4 to 6 feet. Waves
occasionally to 7 feet. A small craft advisory may be needed.
.SATURDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots
in the morning. Rain showers likely. Waves 1 to 3 feet.
$$
LSZ145-220400-
Duluth MN to Port Wing WI-
555 PM CDT Thu May 21 2026
...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM CDT THIS EVENING...
.TONIGHT...Northeast wind 15 to 20 knots with gusts to around
25 knots easing to 5 to 10 knots after midnight. Mostly cloudy
then becoming partly cloudy late in the evening then becoming
mostly cloudy. Waves 2 to 4 feet subsiding to 1 to 2 feet after
midnight.
.FRIDAY...Northeast wind 15 to 20 knots with gusts to around
25 knots. Mostly sunny. Waves 1 to 3 feet building to 3 to 5 feet
in the afternoon. Waves occasionally to 7 feet. A small craft
advisory may be needed.
.FRIDAY NIGHT...Northeast wind 20 to 25 knots with gusts to
around 30 knots easing to 10 to 15 knots with gusts to around
20 knots after midnight. Chance of rain showers in the evening,
then rain showers after midnight. Waves 4 to 6 feet subsiding to
1 to 3 feet early in the morning. Waves occasionally to 7 feet. A
small craft advisory may be needed.
.SATURDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots
in the morning. Rain showers in the morning, then rain showers
likely in the afternoon. Waves 1 to 3 feet.
$$
LSZ146-220400-
Port Wing to Sand Island WI-
555 PM CDT Thu May 21 2026
.TONIGHT...Northeast wind 10 to 15 knots with gusts to around
20 knots easing to 5 knots late in the night. Mostly cloudy.
Waves 1 to 3 feet subsiding to 1 to 2 feet in the late evening
and overnight.
.FRIDAY...Northeast wind 15 to 20 knots. Mostly sunny. Waves 1 to
2 feet building to 2 to 4 feet in the afternoon. A small craft
advisory may be needed.
.FRIDAY NIGHT...Northeast wind 15 to 20 knots becoming east 5 to
10 knots after midnight. Rain showers after midnight. Waves 3 to
5 feet. A small craft advisory may be needed.
.SATURDAY...Northeast wind 5 to 10 knots. Rain showers likely in
the morning, then slight chance of rain showers in the afternoon.
Waves 1 to 2 feet.
$$
LSZ147-220400-
Sand Island to Bayfield WI-
555 PM CDT Thu May 21 2026
.TONIGHT...Northeast wind 5 to 10 knots with gusts to around
20 knots becoming north late in the night. Partly cloudy in the
evening then becoming mostly cloudy. Waves 1 to 2 feet.
.FRIDAY...Northeast wind 15 to 20 knots. Mostly sunny. Waves 1 to
3 feet building to 2 to 4 feet late in the afternoon. A small
craft advisory may be needed.
.FRIDAY NIGHT...East wind 15 to 20 knots with gusts to around
25 knots easing to 5 to 10 knots with gusts to around 20 knots in
the late evening and overnight. Rain showers likely after
midnight. Waves 3 to 5 feet subsiding to 1 to 3 feet early in the
morning. A small craft advisory may be needed.
.SATURDAY...East wind 5 to 10 knots. Rain showers through the
day. Waves 1 to 2 feet.
$$
LSZ150-220400-
Outer Apostle Islands Beyond 5 NM from Mainland-
555 PM CDT Thu May 21 2026
.TONIGHT...East wind 10 to 15 knots with gusts to around 20 knots
becoming southeast 5 to 10 knots after midnight. Partly cloudy in
the evening then becoming mostly cloudy. Waves 1 to 3 feet.
.FRIDAY...East wind 15 to 20 knots with gusts to around 25 knots.
Mostly sunny. Waves 1 to 2 feet building to 3 to 5 feet in the
afternoon. A small craft advisory may be needed.
.FRIDAY NIGHT...East wind 15 to 20 knots with gusts to around
25 knots easing to 5 to 10 knots with gusts to around 20 knots
after midnight. Rain showers likely after midnight. Waves 4 to
6 feet. Waves occasionally to 7 feet. A small craft advisory may
be needed.
.SATURDAY...East wind 5 to 10 knots. Gusts up to 20 knots early
in the morning. Rain showers likely in the morning, then slight
chance of rain showers in the afternoon. Waves 1 to 3 feet.
$$
LSZ121-220400-
Chequamegon Bay-Bayfield to Oak Point WI-
555 PM CDT Thu May 21 2026
.TONIGHT...Northeast wind 10 to 15 knots with gusts to around
20 knots becoming south 5 knots after midnight. Partly cloudy in
the evening then becoming mostly cloudy. Waves 1 to 2 feet.
.FRIDAY...Northeast wind 15 to 20 knots. Mostly sunny. Waves 1 to
2 feet.
.FRIDAY NIGHT...East wind 10 to 15 knots with gusts to around
20 knots easing to 5 knots early in the morning. Slight chance of
rain showers after midnight. Waves 1 to 2 feet.
.SATURDAY...East wind 5 knots. Rain showers likely in the
morning, then slight chance of rain showers in the afternoon.
Waves 1 foot or less.
$$
LSZ148-220400-
Oak Point to Saxon Harbor WI-
555 PM CDT Thu May 21 2026
.TONIGHT...East wind 10 to 15 knots with gusts to around 20 knots
becoming southeast 5 knots after midnight. Partly cloudy in the
evening then becoming mostly cloudy. Waves 1 to 3 feet.
.FRIDAY...Northeast wind 5 to 10 knots rising to 15 to 20 knots
in the afternoon. Mostly sunny. Waves 1 to 3 feet building to
2 to 4 feet late in the afternoon.
.FRIDAY NIGHT...East wind 10 to 15 knots. Gusts up to 20 knots
early in the evening. Rain showers likely after midnight. Waves
2 to 4 feet subsiding to 1 to 3 feet after midnight. A small
craft advisory may be needed.
.SATURDAY...East wind 5 to 10 knots. Rain showers likely in the
morning, then chance of rain showers in the afternoon. Waves 1 to
2 feet.
$$
Graphical marine forecasts are available online at:
weather.gov/greatlakes
WFO DLH

Open Waters Forecast
350
FZUS63 KMQT 212001
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EDT Thu May 21 2026
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...
High pressure of 30.3 to 30.4 inches remains over Lake Superior this
afternoon and tonight before shifting east through Friday into New
England and Quebec. Meanwhile, a 29.7 inch low develops over the
Plains and lifts toward the Great Lakes. The low gradually weakens
to 29.9 inches as it lifts over Lower Michigan and the eastern Great
Lakes Saturday into Sunday. Weak troughing of 30.0 inches passes
northward over Lake Superior Saturday night into Sunday night before
ridging of around 30.0 inches returns on Monday.
LSZ162-220800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EDT Thu May 21 2026 /300 PM CDT Thu May 21 2026/
.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering east late. Waves subsiding
to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. A slight chance of rain showers through
midnight, then rain showers likely after midnight. Waves
subsiding to 2 to 4 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Rain showers through early afternoon, then a chance of
rain showers by mid afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots becoming north
less than 10 knots after midnight. Waves subsiding to calm to
2 feet.
.SUNDAY...Southwest winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing north. Waves calm to
2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.
$$
LSZ263-220800-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
400 PM EDT Thu May 21 2026
.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of rain showers after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.SATURDAY...East winds 10 to 20 knots. Rain showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing east. Waves calm
to 2 feet.
$$
LSZ264-220800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EDT Thu May 21 2026
.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight, then becoming east 10 to 20 knots
late. Waves 2 to 4 feet.
.SATURDAY...Southeast winds 15 to 25 knots. A chance of rain
showers through early afternoon, then rain showers by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.
$$
LSZ265-220800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EDT Thu May 21 2026
.LATE THIS AFTERNOON...East winds 15 to 25 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots veering southeast after
midnight, then becoming east 15 to 25 knots late. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. A chance of rain showers. Waves
subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
$$
LSZ266-220800-
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-
400 PM EDT Thu May 21 2026
.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...Southeast winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.SUNDAY...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
$$
LSZ267-220800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EDT Thu May 21 2026
.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots backing east in the
afternoon, then veering southeast late. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots becoming east
15 to 25 knots after midnight, then increasing to 20 to 30 knots
late. Waves building to 2 to 4 feet.
.SATURDAY...Southeast winds 20 to 30 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
$$
LSZ261-220200-
MAFOR 2121/
Superior West 11120 12220 11310 11200 11210 11220 11130. Waves 1
to 3 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet
Friday.
Superior North Central 15310 11320 11220. Waves 1 to 3 feet.
Superior South Central 11220 12320 12310 11320 11220 11230. Waves
1 to 3 feet.
Superior East 11200 11210 11310 12300 11310 11210 11220. Waves 1
foot or less tonight. Waves 1 to 3 feet Friday.
$$
WFO MQT
Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable
Graphical marine forecasts are available online at:
weather.gov/greatlakes
Other Information
Great Lakes Water Levels and Forecasts - Provided by USACE
GLERL - NOAA Great Lakes Forecast System