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Marine Observations for Lake Superior
Local Radars
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Nearshore Forecast


308
FZUS53 KDLH 231458
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
958 AM CDT Fri Apr 23 2021

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.

LSZ140-141-232215-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
958 AM CDT Fri Apr 23 2021

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.REST OF TODAY...Northwest winds this morning with gusts to 30
knots. Southwest wind 10 to 15 knots with gusts to around 25
knots this afternoon. Slight chance of rain showers in the afternoon.
Waves 2 to 4 feet.
.TONIGHT...West wind 10 to 15 knots becoming north with gusts to
around 25 knots after midnight. Chance of rain showers through
the night. Chance of snow showers after midnight. Waves 1 to
3 feet.
.SATURDAY...Northeast wind 10 to 15 knots with gusts to around
25 knots becoming east 5 to 10 knots late in the afternoon.
Chance of snow showers in the morning, then slight chance of snow
showers in the afternoon. Waves 1 to 3 feet.
.SATURDAY NIGHT...Southeast wind 5 to 10 knots becoming northwest
in the late evening and overnight. Partly cloudy. Waves 2 feet or
less.

$$

LSZ142-143-232215-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
958 AM CDT Fri Apr 23 2021

.REST OF TODAY...Southwest wind 10 to 15 knots. Slight chance of
rain showers early in the afternoon. Chance of rain showers late.
Waves 1 to 3 feet.
.TONIGHT...West wind 5 to 10 knots becoming northwest with gusts
to around 20 knots in the late evening and early morning, then
becoming west 10 to 15 knots early in the morning. Chance of rain
showers through the night. Chance of snow showers after midnight.
Waves 2 feet or less.
.SATURDAY...North wind 5 to 10 knots with gusts to around
20 knots becoming southeast late in the afternoon. Chance of snow
showers in the morning. Waves 2 feet or less.
.SATURDAY NIGHT...Southeast wind 5 knots becoming northwest after
midnight. Mostly clear. Waves 2 feet or less.

$$

LSZ144-145-232215-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
958 AM CDT Fri Apr 23 2021

.REST OF TODAY...Southwest wind 5 to 10 knots. Gusts up to
20 knots early in the afternoon. Slight chance of rain showers in
the late morning and early afternoon, then chance of rain showers
late. Waves 2 feet or less.
.TONIGHT...West wind 5 to 10 knots becoming northwest in the late
evening and early morning, then becoming west early in the
morning. Chance of rain showers through the night. Chance of snow
showers after midnight. Waves 2 feet or less.
.SATURDAY...North wind 5 to 10 knots becoming northeast in the
afternoon. Chance of rain showers and snow showers in the
morning. Waves 2 feet or less.
.SATURDAY NIGHT...Northeast wind 5 knots becoming northwest after
midnight, then becoming north early in the morning. Mostly clear.
Waves 2 feet or less.

$$

LSZ146-147-232215-
Port Wing to Sand Island WI-Sand Island to Bayfield WI-
958 AM CDT Fri Apr 23 2021

.REST OF TODAY...Southwest wind 10 to 15 knots. Slight chance of
rain showers in the afternoon. Waves 1 to 3 feet subsiding to
2 feet or less in the afternoon.
.TONIGHT...West wind 5 to 10 knots becoming north 10 to 15 knots
after midnight. Chance of rain showers through the night. Chance
of snow showers after midnight. Waves 2 feet or less building to
1 to 3 feet early in the morning.
.SATURDAY...Northeast wind 10 to 15 knots becoming east 5 to
10 knots late in the afternoon. Snow showers likely in the
morning, then slight chance of snow showers in the afternoon.
Waves 1 to 3 feet subsiding to 2 feet or less in the afternoon.
.SATURDAY NIGHT...East wind 5 knots becoming south after
midnight. Mostly clear. Waves 2 feet or less.

$$

LSZ150-232215-
Outer Apostle Islands Beyond 5 NM from Mainland-
958 AM CDT Fri Apr 23 2021

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON...

.REST OF TODAY...Southwest wind 15 to 20 knots easing to 5 to
10 knots late. Slight chance of rain showers late. Waves 2 to
4 feet subsiding to 1 to 3 feet in the afternoon.
.TONIGHT...West wind 5 to 10 knots becoming north 10 to 15 knots
after midnight. Chance of rain showers through the night. Chance
of snow showers after midnight. Waves 2 feet or less building to
2 to 4 feet early in the morning.
.SATURDAY...Northeast wind 10 to 15 knots becoming east 5 to
10 knots late in the afternoon. Snow showers likely and slight
chance of rain showers in the morning, then slight chance of snow
showers in the afternoon. Waves 3 to 5 feet. A small craft
advisory may be needed.
.SATURDAY NIGHT...East wind 5 knots becoming southwest after
midnight. Mostly clear. Waves 1 to 3 feet.

$$

LSZ121-232215-
Chequamegon Bay-Bayfield to Oak Point WI-
958 AM CDT Fri Apr 23 2021

.REST OF TODAY...Southwest wind 5 to 10 knots. Chance of rain
showers in the afternoon. Waves 2 feet or less.
.TONIGHT...West wind 5 knots becoming northwest after midnight.
Chance of rain showers in the evening, then rain showers likely
and slight chance of snow showers after midnight. Waves 2 feet or
less.
.SATURDAY...Northeast wind 5 to 10 knots. Snow showers likely and
chance of rain showers in the morning, then chance of snow
showers in the afternoon. Waves 2 feet or less.
.SATURDAY NIGHT...East wind 5 knots becoming southwest after
midnight. Mostly clear. Waves 2 feet or less.

$$

LSZ148-232215-
Oak Point to Saxon Harbor WI-
958 AM CDT Fri Apr 23 2021

.REST OF TODAY...Southwest wind 5 to 10 knots. Slight chance of
rain showers in the afternoon. Waves 2 feet or less.
.TONIGHT...West wind 5 to 10 knots becoming northwest after
midnight, then becoming east early in the morning. Chance of rain
showers. Waves 2 feet or less.
.SATURDAY...Northeast wind 10 to 15 knots. Snow showers likely
and chance of rain showers in the morning, then chance of snow
showers in the afternoon. Waves 3 to 5 feet. A small craft
advisory may be needed.
.SATURDAY NIGHT...East wind 5 knots becoming southwest after
midnight. Mostly clear. Waves 1 to 3 feet.

$$

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

Eagle


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 231357
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
957 AM EDT Fri Apr 23 2021

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 29.6 inch trough will continue to move through
Northern Ontario today, before it drops south across the lake
tonight, while weakening to 29.9 inches. The trough will transtion
into a 29.9 inch low and begin shifting eastward through the day
Saturday, strengthening to 29.7 inches by Saturday night over
southern Ontario. A 30.1 inch ridge will follow late Saturday
night and Sunday. A 29.6 inch trough is expected to move north
into the Upper Great Lakes late Monday.

LSZ162-232200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
957 AM EDT Fri Apr 23 2021 /857 AM CDT Fri Apr 23 2021/

.REST OF TODAY...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots in the afternoon. A slight chance of rain showers
by mid afternoon. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots veering north after
midnight, then increasing to 15 to 25 knots late. A chance of
rain showers. A chance of snow showers after midnight. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots becoming northeast 10 to
20 knots in the afternoon, then becoming southeast 5 to 15 knots
late. A chance of snow showers. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. A chance of rain and snow showers. Waves
building to 2 to 4 feet.
.MONDAY...East winds 15 to 25 knots becoming northeast 10 to
20 knots. Rain showers, possibly mixed with snow, then a chance
of rain showers. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.

$$

LSZ263-232200-
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-
957 AM EDT Fri Apr 23 2021

.REST OF TODAY...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots in the afternoon, then increasing to 15 to
25 knots late. A slight chance of rain showers by mid afternoon.
Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming north 20 to
30 knots after midnight. A chance of rain showers. A chance of
snow showers after midnight. Waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots. A slight chance of rain showers through early
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
1 to 3 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of rain showers. Waves building
to 2 to 4 feet.
.MONDAY...Southeast winds 15 to 25 knots becoming east 10 to
20 knots. Rain showers likely, then a chance of rain showers.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing north. A chance
of rain showers. Waves subsiding to calm to 2 feet.

$$

LSZ264-232200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
957 AM EDT Fri Apr 23 2021

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon, then diminishing to 10 to
20 knots late. Waves 2 to 4 feet building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 5 to 15 knots becoming north 20 to 30 knots
after midnight. A slight chance of rain showers. A chance of snow
showers after midnight. Waves subsiding to 1 to 3 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots. A slight chance of rain
showers through early afternoon. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southeast winds 15 to 25 knots. Rain showers likely,
possibly mixed with snow showers, then a chance of rain showers.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ265-232200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
957 AM EDT Fri Apr 23 2021

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

$$

LSZ266-232200-
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-
957 AM EDT Fri Apr 23 2021

.REST OF TODAY...West winds 10 to 20 knots. A slight chance of
rain showers by mid afternoon. Waves 2 to 4 feet building to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...South winds 5 to 15 knots becoming northwest 10 to
20 knots late. A chance of rain showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of rain showers through early afternoon.
A chance of snow showers. Rain showers likely by mid afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots. A slight chance of
snow showers through midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...Southeast winds 15 to 25 knots. A chance of rain
showers, possibly mixed with snow, then rain showers likely.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...South winds 10 to 20 knots backing northeast. A chance
of rain showers, then rain showers likely. Waves subsiding to
calm to 2 feet.

$$

LSZ267-232200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
957 AM EDT Fri Apr 23 2021

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots late. A slight chance of rain showers by mid
afternoon. Waves 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots. A slight chance of rain
showers. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming west 10 to
20 knots in the afternoon, then becoming northwest 15 to 25 knots
late. A slight chance of rain showers through early afternoon,
then rain showers likely, possibly mixed with snow showers by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of snow showers, possibly mixed
with rain through midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers, then rain showers likely.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...South winds 10 to 20 knots backing east. A chance of
rain showers, then rain showers likely. Waves subsiding to calm
to 2 feet.

$$
LSZ261-232200-
MAFOR 2315/
Superior West 12520 12510 11710 13830. A chance of rain showers
this evening, then a chance of rain and snow showers overnight. A
chance of snow showers Saturday morning. Waves 3 to 5 feet
subsiding to 2 to 4 feet this afternoon. Waves 1 to 3 feet
building to 3 to 5 feet tonight. Waves 3 to 6 feet Saturday
morning.

Superior North Central 12530 11520 11620 11710 12840 11830. A
chance of snow and rain showers Saturday morning. Waves 3 to 6
feet this afternoon and tonight. Waves 5 to 7 feet Saturday
morning.

Superior South Central 12620 11510 11410 11500 11710 11720 11820.
A chance of rain showers this evening and Saturday morning. Waves
1 to 4 feet.

Superior East 13510 12410 11510 11410 11500. Waves 1 to 4 feet.

$$

JAW

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

NWS Marine Homepage