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Marine Observations for Lake Superior
Local Radars
Duluth         Marquette  
DLH Reflectivity       MQT Reflectivity
Reflectivity       Reflectivity

 

 

 

 

 

Nearshore Forecast


628
FZUS53 KDLH 191433
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
933 AM CDT Fri Jul 19 2024

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.

LSZ141-192215-
Grand Marais to Taconite Harbor MN-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 10 to 15 knots. Gusts up to
20 knots in the afternoon. Mostly sunny. Waves 1 to 3 feet.
.TONIGHT...West wind 5 to 10 knots with gusts to around 20 knots
easing to 5 knots early in the morning. Partly cloudy. Waves 1 to
2 feet.
.SATURDAY...Northwest wind 5 knots becoming east in the late
morning and afternoon. Slight chance of showers and
thunderstorms. Waves 1 to 2 feet.
.SATURDAY NIGHT...Northeast wind 5 knots becoming north early in
the morning. Partly cloudy. Waves 1 foot or less.

$$

LSZ140-192215-
Grand Portage to Grand Marais MN-
933 AM CDT Fri Jul 19 2024

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING...

.REST OF TODAY...Southwest wind 15 to 20 knots. Gusts up to
20 knots increasing to 25 knots in the afternoon. Mostly sunny.
Waves 1 to 2 feet building to 2 to 4 feet in the afternoon.
.TONIGHT...West wind 10 to 15 knots with gusts to around 25 knots
becoming northwest 5 knots early in the morning. Partly cloudy in
the evening then becoming mostly cloudy. Waves 2 to 4 feet
subsiding to 1 to 3 feet in the late evening and overnight.
.SATURDAY...Northeast wind 5 to 10 knots becoming east in the
afternoon. Slight chance of showers and thunderstorms. Waves 1 to
2 feet.
.SATURDAY NIGHT...East wind 5 knots becoming north in the late
evening and overnight. Mostly clear. Waves 1 foot or less.

$$

LSZ142-143-192215-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 5 to 10 knots. Gusts up to
20 knots in the afternoon. Mostly sunny. Waves 1 to 2 feet.
.TONIGHT...Southwest wind 5 to 10 knots. Partly cloudy. Waves
1 to 2 feet.
.SATURDAY...West wind 5 knots becoming northeast 10 to 15 knots
with gusts to around 20 knots in the late morning and afternoon.
Slight chance of showers and thunderstorms through the day. Waves
1 to 2 feet.
.SATURDAY NIGHT...Northeast wind 10 to 15 knots. Partly cloudy.
Waves 1 to 2 feet.

$$

LSZ144-145-192215-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 5 to 10 knots. Sunny. Waves
1 foot or less.
.TONIGHT...Southwest wind 5 to 10 knots. Partly cloudy. Waves
1 foot or less.
.SATURDAY...West wind 5 to 10 knots becoming northeast 10 to
15 knots with gusts to around 20 knots in the afternoon. Slight
chance of showers and thunderstorms through the day. Waves 1 to
2 feet.
.SATURDAY NIGHT...Northeast wind 10 to 15 knots. Mostly cloudy in
the evening then becoming partly cloudy. Waves 1 to 2 feet.

$$

LSZ146-192215-
Port Wing to Sand Island WI-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 10 to 15 knots. Gusts up to
20 knots in the late morning and early afternoon. Sunny. Waves
1 to 2 feet.
.TONIGHT...Southwest wind 5 to 10 knots. Partly cloudy. Waves
1 foot or less.
.SATURDAY...West wind 5 to 10 knots becoming northeast early in
the afternoon, then rising to 10 to 15 knots late in the
afternoon. Slight chance of showers and thunderstorms through the
day. Waves 1 to 2 feet.
.SATURDAY NIGHT...Northeast wind 10 to 15 knots. Partly cloudy.
Waves 1 to 2 feet.

$$

LSZ147-192215-
Sand Island to Bayfield WI-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 10 to 15 knots. Gusts up to
20 knots in the late morning and early afternoon. Sunny. Waves
1 to 2 feet.
.TONIGHT...Southwest wind 5 to 10 knots. Mostly clear. Waves
1 foot or less.
.SATURDAY...Southwest wind 5 to 10 knots becoming northwest late
in the morning, then becoming northeast in the afternoon. Slight
chance of showers and thunderstorms. Waves 1 to 2 feet.
.SATURDAY NIGHT...Northeast wind 5 to 10 knots. Partly cloudy.
Waves 1 to 2 feet.

$$

LSZ150-192215-
Outer Apostle Islands Beyond 5 NM from Mainland-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 10 to 15 knots. Gusts up to
20 knots in the late morning and early afternoon. Sunny. Waves
1 to 2 feet.
.TONIGHT...Southwest wind 5 to 10 knots. Partly cloudy. Waves
1 to 2 feet.
.SATURDAY...West wind 5 to 10 knots becoming northwest late in
the morning, then becoming northeast 10 to 15 knots in the
afternoon. Slight chance of showers and thunderstorms. Waves 1 to
2 feet.
.SATURDAY NIGHT...Northeast wind 5 to 10 knots. Partly cloudy.
Waves 1 to 2 feet.

$$

LSZ121-192215-
Chequamegon Bay-Bayfield to Oak Point WI-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 5 to 10 knots. Sunny. Waves
1 foot or less.
.TONIGHT...Southwest wind 5 to 10 knots. Mostly clear. Waves
1 foot or less.
.SATURDAY...Southwest wind 5 knots becoming northeast in the
afternoon. Slight chance of showers and thunderstorms through the
day. Waves 1 foot or less.
.SATURDAY NIGHT...Northeast wind 5 to 10 knots. Partly cloudy.
Waves 1 foot or less.

$$

LSZ148-192215-
Oak Point to Saxon Harbor WI-
933 AM CDT Fri Jul 19 2024

.REST OF TODAY...Southwest wind 5 to 10 knots. Sunny. Waves
1 foot or less.
.TONIGHT...Southwest wind 5 to 10 knots. Mostly clear. Waves
1 foot or less.
.SATURDAY...Southwest wind 5 to 10 knots becoming northwest late
in the morning, then becoming northeast in the afternoon. Slight
chance of showers and thunderstorms through the day. Waves 1 to
2 feet.
.SATURDAY NIGHT...Northeast wind 5 to 10 knots. Partly cloudy.
Waves 1 to 2 feet.

$$

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

Britt


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


011
FZUS63 KMQT 191354
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
954 AM EDT Fri Jul 19 2024

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 high pressure currently centered over
northern Illinois expands east along the Great Lakes today,
eventually giving way to 30.0 inch trough pushing south from
Canada over the lake tonight into Saturday. A 30.1 inch high
follows, building over Lake Superior Sunday and Monday.

LSZ162-192200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
954 AM EDT Fri Jul 19 2024 /854 AM CDT Fri Jul 19 2024/

.REST OF TODAY...Southwest winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering west late. A slight chance
of showers and thunderstorms after midnight. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming east 10 to 20 knots
in the afternoon, then backing northeast late. A slight chance of
showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves building to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ263-192200-
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-
954 AM EDT Fri Jul 19 2024

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. Waves 1 to 3 feet building to
2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A slight chance of showers and
thunderstorms after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ264-192200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
954 AM EDT Fri Jul 19 2024

.REST OF TODAY...Southwest winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering north late. A slight chance of
showers and thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots increasing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-192200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
954 AM EDT Fri Jul 19 2024

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots backing southwest after
midnight, then veering west late. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots veering north in the
afternoon, then diminishing to 5 to 15 knots late. Waves calm to
2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ266-192200-
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-
954 AM EDT Fri Jul 19 2024

.REST OF TODAY...West winds 10 to 20 knots. Waves 1 to 3 feet
building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming west 10 to 20 knots late.
Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ267-192200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
954 AM EDT Fri Jul 19 2024

.REST OF TODAY...Southwest winds 10 to 20 knots veering west in
the afternoon, then diminishing to 5 to 15 knots late. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon, then backing northwest late. A slight
chance of showers through early afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots becoming east 10 to 20 knots.
Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ261-192200-
MAFOR 1915/
Superior West 13520 12510 12610 11710. Waves 1 to 3 feet.

Superior North Central 12520 11530 11620 11610 11710 11800 11110.
Waves 2 to 4 feet this afternoon and tonight. Waves 1 to 2 feet
Saturday morning.

Superior South Central 13610 11510 11500 12610 11710. Waves 1 to
2 feet.

Superior East 12510 14500 11600 11700. Waves 1 to 2 feet.

$$

Thompson

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

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


Beach Hazards


427
FZUS53 KDLH 190913
SRFDLH

Surf Zone Forecast
National Weather Service Duluth MN
413 AM CDT Fri Jul 19 2024

MNZ037-WIZ001-200315-
Carlton/Southern St. Louis-Douglas-
Including the beaches of Minnesota/Park Point and Wisconsin Point
413 AM CDT Fri Jul 19 2024

.TODAY...
Swim Risk*..................Low.
Wave Height.................1 foot or less.
UV Index**..................High.
Water Temperature...........In the mid to upper 60s.
Weather.....................Sunny.
High Temperature............In the upper 70s.
Winds.......................Southwest winds around 10 mph.
Sunrise.....................5:34 AM.
Sunset......................8:55 PM.

.SATURDAY...
Swim Risk*..................Moderate.
Wave Height.................1 to 2 feet.
Weather.....................Mostly sunny. A chance of
thunderstorms.
High Temperature............In the mid 70s.
Winds.......................West winds around 5 mph, becoming
northeast in the afternoon.
Sunrise.....................5:35 AM.
Sunset......................8:55 PM.

.SUNDAY...Sunny. Highs around 70. Northeast winds around 10 mph.
.MONDAY...Sunny. A slight chance of thunderstorms. Highs in the mid
70s. Southeast winds around 5 mph.
.TUESDAY...Partly sunny. A chance of thunderstorms. Highs in the
upper 60s. Northeast winds around 10 mph.

&&

Swim Risk Category
* Low Risk - Large waves and dangerous currents are not expected,
however dangerous currents may exist at any time near piers,
breakwalls, and river outlets.
* Moderate Risk - Breaking waves and currents are expected. Stay away
from dangerous areas like piers, breakwalls, and river outlets.
Always have a flotation device with you in the water.
* High Risk - Life-threatening waves and currents are expected. Stay
out of the water and stay away from dangerous areas like piers and
breakwalls.

** For thunderstorm, waterspout, and UV definitions see:
https://www.weather.gov/beach/dlh


$$